================================================================================
                             VINA TECHNOLOGIES, INC.
                             a Delaware corporation
                                       and
                     AMERICAN STOCK TRANSFER & TRUST COMPANY
                             a New York corporation
                                  Rights Agent
                                  ------------
                                Rights Agreement
                            Dated as of July 25, 2001
================================================================================
                                TABLE OF CONTENTS
                                                                                          Page
                                                                                        
1.   Certain Definitions....................................................................1
2.   Appointment of Rights Agent............................................................5
3.   Issue of Rights Certificates...........................................................5
4.   Form of Rights Certificates............................................................6
5.   Countersignature and Registration......................................................7
6.   Transfer, Split Up, Combination and Exchange of Rights Certificates;  Mutilated,
     Destroyed, Lost or Stolen Rights Certificates..........................................8
7.   Exercise of Rights; Purchase Price; Expiration Date of Rights..........................8
8.   Cancellation and Destruction of Rights Certificates...................................10
9.   Reservation and Availability of Preferred Stock.......................................11
10.  Preferred Stock Record Date...........................................................12
11.  Adjustment of Purchase Price, Number and Kind of Shares or Number of Rights...........12
12.  Certificate of Adjusted Purchase Price or Number of Shares............................19
13.  Consolidation, Merger or Sale or Transfer of Assets or Earning Power..................19
14.  Additional Covenants..................................................................22
15.  Fractional Rights and Fractional Shares...............................................22
16.  Rights of Action......................................................................23
17.  Agreement of Rights Holders...........................................................23
18.  Rights Certificate Holder Not Deemed a Stockholder....................................24
19.  Concerning the Rights Agent...........................................................24
20.  Merger or Consolidation or Change of Name of Rights Agent.............................25
21.  Duties of Rights Agent................................................................25
22.  Change of Rights Agent................................................................27
23.  Issuance of New Rights Certificates...................................................28
24.  Redemption, Termination and Exchange..................................................29
25.  Notice of Certain Events..............................................................31
26.  Notices...............................................................................32
27.  Supplements and Amendments............................................................32
28.  Determination and Actions by the Board................................................33
29.  Successors............................................................................33
30.  Benefits of This Agreement............................................................33
31.  Severability..........................................................................33
32.  Governing Law.........................................................................34
33.  Counterparts..........................................................................34
34.  Descriptive Headings..................................................................34
Exhibit A --      Certificate of Designation of Series A
                  Participating Preferred Stock........................A-1
Exhibit B --      Form of Rights Certificate...........................B-1
Exhibit C --      Form of Summary of Rights............................C-1
                                RIGHTS AGREEMENT
     THIS RIGHTS  AGREEMENT  (this  "Agreement")  is dated as of July 25,  2001,
between VINA  TECHNOLOGIES,  INC., a Delaware  corporation (the "Company"),  and
AMERICAN  STOCK TRANSFER & TRUST COMPANY,  a New York  corporation  (the "Rights
Agent").
                              W I T N E S S E T H:
                              --------------------
     WHEREAS,  on July 12,  2001,  the Board of  Directors  of the Company  (the
"Board")  authorized  and  declared  a  dividend  distribution  of one Right (as
hereinafter defined) for each share of Common Stock, of the Company (the "Common
Stock")  outstanding  as of the Close of Business  (as  hereinafter  defined) on
August 6, 2001 (the "Record Date"),  and  contemplates the issuance of one Right
(subject to adjustment as provided herein) for each share of Common Stock issued
between  the  Record  Date  and the  earlier  of the  Distribution  Date and the
Expiration  Date, as such terms are hereinafter  defined (with Rights also to be
issued  in  connection  with  certain   issuances  of  Common  Stock  after  the
Distribution  Date, as provided more fully herein),  each Right representing the
right  to  purchase  one  one-thousandth  of a share of  Series A  Participating
Preferred  Stock,  par value $0.0001 per share,  of the Company (the  "Preferred
Stock")  having  the  rights,  powers and  preferences  set forth in the form of
Certificate of Designation  attached  hereto as Exhibit A (the  "Certificate  of
Designation"),  upon the terms and  subject to the  conditions  hereinafter  set
forth (the "Rights").
     NOW, THEREFORE,  in consideration of the premises and the mutual agreements
herein set forth, the parties hereto hereby agree as follows:
     1. Certain Definitions. For purposes of this Agreement, the following terms
        -------------------
have the meanings indicated:
     (a)  "Acquiring  Person" shall mean any Person (as such term is hereinafter
defined) who or which, together with all Affiliates (as such term is hereinafter
defined) and Associates  (as such term is  hereinafter  defined) of such Person,
shall be the Beneficial  Owner (as such term is  hereinafter  defined) of twenty
percent (20%) or more of the shares of Common Stock then  outstanding or who was
such a Beneficial Owner at any time on or after the date hereof,  whether or not
such Person continues to be the Beneficial Owner of twenty percent (20%) or more
of the outstanding shares of Common Stock. Notwithstanding the foregoing:
     (i) in no event shall a Person who or which,  together with all  Affiliates
and  Associates  of such  Person,  is the  Beneficial  Owner of less than twenty
percent  (20%) of the  outstanding  shares of Common  Stock  become an Acquiring
Person solely as a result of a reduction of the number of shares of  outstanding
Common Stock, including repurchases of outstanding shares of Common Stock by the
Company,  which  reduction  increases the  percentage of  outstanding  shares of
Common Stock  Beneficially  Owned (as such term is hereinafter  defined) by such
Person; provided,  however, that any subsequent increase in the amount of Common
Stock  Beneficially  Owned by such  Person,  together  with all  Affiliates  and
Associates of such Person, without the prior written approval of the Board shall
cause such Person to be an Acquiring Person (unless, measured at such time, such
Person would not be an Acquiring Person);
     (ii) the term Acquiring Person shall not mean:
     (A) the Company;
     (B) any Subsidiary (as such term is hereinafter defined) of the Company;
     (C) any employee benefit plan of the Company or any of its Subsidiaries;
     (D) any entity holding  securities of the Company  organized,  appointed or
established  by the  Company or any of its  Subsidiaries  for or pursuant to the
terms of any such plan;
     (E) any underwriter acting in good faith in a firm commitment  underwriting
of an offering of the Company's  securities  pursuant to  arrangements  with the
Company that have been approved by the Board (however, the exception provided by
this  clause  (E)  shall no  longer  be  available  in the  event  that any such
underwriter is otherwise an Acquiring Person on or after the date which is forty
(40) days after the date of initial  acquisition of the Company's  securities by
such underwriter in connection with such offering); or
     (F) Sierra  Ventures V, L.P.  and Sierra  Ventures  VI, L.P.  (referred  to
collectively  with their  Affiliates  and  Associates as  "Sierra"),  so long as
Sierra is not the Beneficial Owner of a percentage of the outstanding  shares of
Common Stock that is greater (by more than five percent (5%) of the  outstanding
shares of Common  Stock) than (1) the  percentage of the  outstanding  shares of
Common Stock as to which Sierra has  Beneficial  Ownership on the date hereof or
(2) such lesser percentage as to which Sierra has Beneficial Ownership following
any transfer of  securities  by Sierra  after the date hereof  (except that this
clause (F) shall pertain only until such time as Sierra has Beneficial Ownership
of less than twenty  percent (20%) of the  outstanding  shares of Common Stock);
provided,  that any  shares of Common  Stock  Beneficially  Owned by one or more
officers or directors of the Company  where (x) such  officers or directors  are
also included  within the term "Sierra" and (y) such shares of Common Stock were
distributed  directly by the Company to such  officers  or  directors  as equity
based  compensation,  shall be excluded from the  calculation  of the Beneficial
Ownership of Sierra for purposes of the definition of "Acquiring  Person" if the
inclusion of such shares of Common Stock in such calculation,  by itself,  would
otherwise cause Sierra to be an Acquiring Person; and
     (iii) no Person  shall be deemed to be an Acquiring  Person if:  (A)(1) any
Schedule  13D  under  the  Securities  Exchange  Act of 1934,  as  amended  (the
"Exchange Act"), or any comparable or successor report, filed (or required to be
filed) by such Person does not (or would not) state any  intention to or reserve
the right to control or influence  the  management or policies of the Company or
engage in any of the actions specified in Item 4 (or any comparable or successor
Item) of such Schedule 13D (other than the  disposition  of Common  Stock),  (2)
either (x) within two (2)  Business  Days of being  requested  by the Company to
advise the Company  regarding the same, such Person  certifies in writing to the
Company that such Person acquired  Beneficial  Ownership of twenty percent (20%)
or more of the  outstanding  shares of Common  Stock  inadvertently  or  without
knowledge of the terms of the Rights,  or (y) the Board determines in good faith
that such Person has become an Acquiring Person  inadvertently,  (3) such Person
divests as promptly as practicable  (as determined in good faith by the Board) a
sufficient number of securities so that such Person would not be deemed to be an
Acquiring  Person  pursuant to the first sentence of this Section 1(a), (or such
other  provisions  of this Section 1(a) as may be  applicable)  and (4) promptly
following such Person's divestiture of such securities, such Person certifies to
the Board  that such  Person  would no longer be deemed an  Acquiring  Person as
defined  pursuant  to the first  sentence  of this  Section  1(a) (or such other
provisions of this Section 1(a) as may be applicable);  or (B) by reason of such
Person's Beneficial Ownership of twenty percent (20%) or more of the outstanding
shares  of Common  Stock on the date  hereof  if prior to the  Record  Date such
Person notifies the Board that such Person is no longer the Beneficial  Owner of
twenty percent (20%) or more of the then outstanding shares of Common Stock.
     (b) "Affiliate" and "Associate" shall have the respective meanings ascribed
to such  terms in Rule  12b-2 of the  General  Rules and  Regulations  under the
Exchange Act as in effect on the date of this Agreement.
     (c) A Person shall be deemed the "Beneficial Owner," and shall be deemed to
"Beneficially Own" or have "Beneficial Ownership," of any securities:
     (i) which such Person or any of such  Person's  Affiliates or Associates is
deemed to  beneficially  own  (within  the  meaning of Rule 13d-3 of the General
Rules and Regulations under the Exchange Act as in effect on the date hereof);
     (ii) which such Person or any of such Person's Affiliates or Associates has
(A) the right or  obligation  to acquire  (whether  such right or  obligation is
exercisable or effective immediately or only after the passage of time) pursuant
to any agreement,  arrangement or  understanding  (whether or not in writing) or
upon the exercise of conversion rights,  exchange rights, rights (other than the
Rights),  warrants or options, or otherwise;  provided,  however,  that a Person
shall not be deemed  (under this clause (A)) the  "Beneficial  Owner," and shall
not be deemed (under this clause (A)) to "Beneficially  Own" or have "Beneficial
Ownership," of securities  tendered  pursuant to a tender or exchange offer made
by or on behalf of such Person or any of such Person's  Affiliates or Associates
until such tendered securities are accepted for payment or exchange;  or (B) the
right  to  vote  or  dispose  of  pursuant  to  any  agreement,  arrangement  or
understanding  (whether or not in  writing);  provided,  however,  that a Person
shall  not be  deemed  the  "Beneficial  Owner,"  and  shall  not be  deemed  to
"Beneficially  Own" or have  "Beneficial  Ownership," of any security under this
clause (B) if the agreement,  arrangement or understanding to vote such security
(1) arises solely from a revocable  proxy given in response to a public proxy or
consent  solicitation  made pursuant to, and in accordance  with, the applicable
rules and regulations of the Exchange Act and (2) is not also then reportable by
such  Person on  Schedule  13D  under the  Exchange  Act (or any  comparable  or
successor report); or
     (iii) which are Beneficially  Owned,  directly or indirectly,  by any other
Person (or any Affiliate or Associate  thereof) with which such Person or any of
such  Person's  Affiliates  or  Associates  has any  agreement,  arrangement  or
understanding  (whether or not in writing) (other than customary agreements with
and between  underwriters  and selling group members with respect to a bona fide
public  offering  of  securities),  or with  which  such  Person  or any of such
Person's Affiliates or Associates have otherwise formed a group, for the purpose
of acquiring, holding, voting (except pursuant to a revocable proxy as described
in clause (B) of  subparagraph  (ii) of this  paragraph (c)) or disposing of any
securities of the Company.
     (d) "Business Day" shall mean any day other than a Saturday,  Sunday,  or a
day on which banking  institutions  in the State of California are authorized or
obligated by law or executive order to close.
     (e)  "Close of  Business"  on any given  date  shall  mean 5:00  p.m.,  San
Francisco  time,  on such date;  provided,  however,  that if such date is not a
Business Day it shall mean 5:00 p.m., San Francisco time, on the next succeeding
Business Day.
     (f)  "Common  Stock"  shall mean the Common  Stock,  par value  $0.0001 per
share,  of the Company or any other shares of capital  stock of the Company into
which such Common Stock may be  reclassified  or exchanged,  except that "Common
Stock" when used with  reference  to stock  issued by any Person  other than the
Company  shall mean the capital  stock with the greatest  Voting  Power,  or the
equity securities or other equity interest having power to control or direct the
management, of such Person or, if such Person is a Subsidiary of another Person,
of the Person which ultimately  controls such  first-mentioned  Person and which
has issued and  outstanding  such capital  stock,  equity  securities  or equity
interests.
     (g)  "Distribution  Date" shall have the meaning set forth in Section  3(a)
hereof.
     (h)  "Permitted  Offer"  shall  mean a tender  or  exchange  offer  for all
outstanding shares of Common Stock at a price and on terms determined,  prior to
the date of the first  acceptance of payment for any of such shares,  to be fair
to, and in the best interests of, the Company and its  stockholders  (other than
the offeror or any Affiliate or Associate thereof) by at least a majority of the
members of the Board who are not (i) officers of the Company,  (ii) the offeror,
(iii)  Acquiring  Persons or (iv) Affiliates or Associates of the offeror or any
Acquiring Person.
     (i) "Person" shall mean any  individual,  firm,  corporation,  partnership,
limited liability company, joint venture, association, trust or other entity.
     (j)  "Preferred  Stock"  shall  mean the Series A  Participating  Preferred
Stock, par value $0.0001 per share, of the Company.
     (k)  "Stock   Acquisition  Date"  shall  mean  the  first  date  of  public
announcement by the Company or an Acquiring  Person that an Acquiring Person has
become such.
     (l) A "Subsidiary" of any Person shall mean any corporation or other entity
of which a majority  of the  voting  power of the voting  equity  securities  or
voting interests is owned,  directly or indirectly,  by such Person, or which is
otherwise controlled by such Person.
     (m) "Triggering Event" shall mean a Section 11 Event (as defined in Section
11(a) hereof) or a Section 13 Event (as defined in Section 13(a) hereof).
     (n) "Voting  Power"  shall mean the voting power of all  securities  of the
Company  then  outstanding  and  generally  entitled to vote for the election of
directors of the Company.
     2.  Appointment  of Rights Agent.  The Company  hereby  appoints the Rights
         ----------------------------
Agent  to act as  agent  for the  Company  in  accordance  with  the  terms  and
conditions  hereof,  and the Rights Agent hereby accepts such  appointment.  The
Company  may from  time to time  appoint  such  co-Rights  Agents as it may deem
necessary or desirable upon written notice to the Rights Agent. The Rights Agent
shall have no duty to  supervise,  and shall in no event be liable for, the acts
or omissions of any such co-Rights  Agent. In the event the Company appoints one
or more co-Rights  Agents,  the  respective  duties of the Rights Agents and any
co-Rights Agents shall be as the Company shall determine.
     3. Issue of Rights Certificates.
        ----------------------------
     (a) Until the earlier of (i) the Stock  Acquisition  Date or (ii) the Close
of  Business  on the tenth  (10th)  Business  Day (or such  later date as may be
determined  by  action  of  the  Board)  after  the  date  of  the  commencement
(determined in accordance  with Rule 14d-2 of the General Rules and  Regulations
under  the  Exchange  Act as in  effect  as the date  hereof  or,  if no  longer
applicable,  the  intent of such Rule  14d-2 as in effect on the date  hereof as
determined  in good faith by the Board) by any Person  (other than the  Company,
any Subsidiary of the Company,  any employee  benefit plan of the Company or any
of its Subsidiaries,  or any entity  organized,  appointed or established by the
Company  or any of its  Subsidiaries  for or  pursuant  to the terms of any such
plan)  of a  tender  or  exchange  offer  (other  than a  Permitted  Offer)  the
consummation of which would result in such Person  becoming an Acquiring  Person
(including  any such date  which is on or after the date of this  Agreement  and
prior to the  issuance of the Rights)  (the  earlier of such dates being  herein
referred to as the  "Distribution  Date"),  (x) the Rights shall be evidenced by
the  certificates for Common Stock registered in the names of the holders of the
Common  Stock  (which  certificates  for Common Stock shall be deemed also to be
certificates  for Rights) and not by  separate  certificates  and (y) the Rights
(and the right to receive  certificates  therefor) shall be transferable only in
connection  with the transfer of the underlying  shares of Common Stock. As soon
as  practicable  after the  Distribution  Date,  the Rights Agent shall send, by
first-class,  insured, postage prepaid mail, to each record holder of the Common
Stock as of the Close of Business on the  Distribution  Date,  at the address of
such holder shown on the records of the Company,  a certificate  for Rights,  in
substantially  the  form  of  Exhibit  B  hereto  (the  "Rights  Certificates"),
evidencing  one  Right  for each  share of  Common  Stock  so held  (subject  to
adjustment  as provided  herein).  As of and after the  Distribution  Date,  the
Rights shall be evidenced solely by such Rights Certificates.
     As soon as practicable  following the Record Date, the Company shall send a
copy of a Summary  of  Rights,  in  substantially  the form  attached  hereto as
Exhibit C (the "Summary of Rights"),  by  first-class,  postage prepaid mail, to
each record holder of the Common Stock as of the Close of Business on the Record
Date,  at the address of such holder shown on the records of the  Company.  With
respect to certificates for the Common Stock  outstanding as of the Record Date,
until the Distribution Date (or earlier redemption, expiration or termination of
the Rights),  the Rights shall be evidenced by such  certificates for the Common
Stock  and  the  registered  holders  of the  Common  Stock  shall  also  be the
registered  holders of the associated  Rights.  Until the Distribution  Date (or
earlier redemption,  expiration or termination of the Rights), the surrender for
transfer of any of the  certificates  for the Common  Stock  outstanding  on the
Record Date shall also constitute the transfer of the Rights associated with the
Common Stock represented by such certificate.
     (b) Certificates  issued for Common Stock (including,  without  limitation,
certificates  issued upon transfer or exchange of Common Stock) after the Record
Date, but prior to the earlier of the Distribution  Date or the Expiration Date,
shall be deemed also to be  certificates  for Rights,  and shall have impressed,
printed, stamped, written or otherwise affixed onto them the following legend:
     This  certificate  also evidences and entitles the holder hereof to certain
Rights as set forth in a Rights Agreement between VINA  Technologies,  Inc. (the
"Company")  and American  Stock  Transfer & Trust  Company (the "Rights  Agent")
dated as of July 25,  2001  (the  "Rights  Agreement"),  the  terms of which are
hereby  incorporated  herein by reference  and a copy of which is on file at the
principal offices of the Company. Under certain  circumstances,  as set forth in
the  Rights  Agreement,  such  Rights may be  redeemed,  may  expire,  or may be
evidenced  by  separate  certificates  and will no longer be  evidenced  by this
certificate.  The Company will mail to the holder of this  certificate a copy of
the Rights Agreement without charge after receipt of a written request therefor.
Under certain circumstances,  Rights "Beneficially Owned" by "Acquiring Persons"
(as such terms are defined in the Rights  Agreement) or certain related parties,
as well as subsequent holders of such Rights, may become null and void.
     With respect to such certificates  containing the foregoing  legend,  until
the Distribution Date (or earlier  redemption,  expiration or termination of the
Rights),  the  Rights  associated  with the  Common  Stock  represented  by such
certificates  shall be evidenced by such  certificates  alone, and the surrender
for transfer of any of such  certificates  shall also constitute the transfer of
the Rights associated with the Common Stock represented by such certificate.
     4. Form of Rights Certificates.
        ---------------------------
     (a) The Rights  Certificates  (and the forms of election to purchase shares
and of assignment and  certificates to be printed on the reverse  thereof) shall
each be  substantially  in the form set forth in  Exhibit B hereto  and may have
such marks of  identification  or  designation  and such  legends,  summaries or
endorsements  printed thereon as the Company may deem appropriate and as are not
inconsistent  with the  provisions of this  Agreement,  or as may be required to
comply with any  applicable  law or with any rule or  regulation  made  pursuant
thereto or with any rule or  regulation  of any stock  exchange  or  interdealer
quotation  system on which the Rights may from time to time be listed or traded,
or to conform to usage.  Subject to the  provisions of Section 11 and Section 23
hereof, the Rights Certificates,  whenever distributed, shall be dated as of the
Record  Date,  and on their face shall  entitle the holders  thereof to purchase
such number of one one-thousandths of a share of Preferred Stock as shall be set
forth therein at the price per one  one-thousandth  of a share set forth therein
(the "Purchase Price"),  such Purchase Price to be initially equal to the amount
set forth in Section 7(b) below but the number of one one-thousandths of a share
and the Purchase Price shall be subject to adjustment as provided herein.
     (b) Any Rights  Certificate  issued  pursuant  to Section  3(a) hereof that
represents Rights  Beneficially Owned by an Acquiring Person or any Associate or
Affiliate  thereof,  any Rights Certificate issued at any time upon the transfer
of any Rights to such an Acquiring Person or any Associate or Affiliate  thereof
or to any nominee of such  Acquiring  Person,  Associate or  Affiliate,  and any
Rights Certificate issued pursuant to Section 6, Section 11 or Section 23 hereof
upon  transfer,  exchange,   replacement  or  adjustment  of  any  other  Rights
Certificate referred to in this sentence, shall contain the following legend:
     The Rights  represented by this Rights  Certificate were issued to a Person
who was an  Acquiring  Person or an  Affiliate  or an  Associate of an Acquiring
Person  (as such  terms  are  defined  in the  Rights  Agreement).  This  Rights
Certificate  and the  Rights  represented  hereby  may  become  void  under  the
circumstances specified in Section 7(e) of the Rights Agreement.
The  provisions  of Section 7(e) hereof  shall be  operative  whether or not the
foregoing legend is contained on any such Rights Certificate.
     5. Countersignature and Registration.
        ---------------------------------
     (a) The Rights  Certificates  shall be executed on behalf of the Company by
its Chief Executive Officer,  its President,  its Chief Financial Officer or any
Vice  President,  either  manually  or by  facsimile  signature,  and shall have
affixed  thereto  the  Company's  seal or a  facsimile  thereof  which  shall be
attested by the  Secretary  or an Assistant  Secretary  of the  Company,  either
manually  or  by  facsimile   signature.   The  Rights   Certificates  shall  be
countersigned  by the Rights Agent,  either manually or by facsimile  signature,
and shall  not be valid for any  purpose  unless so  countersigned.  In case any
officer  of the  Company  who shall have  signed any of the Rights  Certificates
shall cease to be such  officer of the Company  before  countersignature  by the
Rights Agent and issuance and delivery by the Company, such Rights Certificates,
nevertheless, may be countersigned by the Rights Agent, and issued and delivered
by the  Company  with the same  force and effect as though the Person who signed
such Rights  Certificates had not ceased to be such officer of the Company;  and
any  Rights  Certificates  may be signed on behalf of the  Company by any Person
who, at the actual date of the execution of such Rights Certificate,  shall be a
proper officer of the Company to sign such Rights  Certificate,  although at the
date of the execution of this Agreement any such Person was not such an officer.
     (b) Following the Distribution Date, the Rights Agent will keep or cause to
be kept, at its office  designated for such purpose,  books for registration and
transfer of the Rights Certificates issued hereunder.  Such books shall show the
names and addresses of the respective  holders of the Rights  Certificates,  the
number of Rights  evidenced on its face by each of the Rights  Certificates  and
the date of each of the Rights Certificates.
     6. Transfer,  Split Up,  Combination  and Exchange of Rights  Certificates;
        -----------------------------------------------------------------------
Mutilated, Destroyed, Lost or Stolen Rights Certificates.
--------------------------------------------------------
     (a) Subject to the provisions of Sections 7(e), 7(f) and 15 hereof,  at any
time after the Close of Business on the  Distribution  Date,  and at or prior to
the  Close of  Business  on the  Expiration  Date,  any  Rights  Certificate  or
Certificates  may be  transferred,  split up,  combined or exchanged for another
Rights  Certificate or Rights  Certificates,  entitling the registered holder to
purchase a like number of one one-thousandths of a share of Preferred Stock (or,
after the  occurrence  of a  Triggering  Event,  shares of Common Stock or other
securities and property, as the case may be) as the Rights Certificate or Rights
Certificates surrendered then entitled such holder (or former holder in the case
of a transfer) to purchase.  Any registered  holder desiring to transfer,  split
up,  combine or  exchange  any  Rights  Certificate  shall make such  request in
writing   delivered  to  the  Rights  Agent,  and  shall  surrender  the  Rights
Certificate or Rights  Certificates  to be  transferred,  split up,  combined or
exchanged at the principal office of the Rights Agent. Subject to receipt by the
Company and the Rights Agent of evidence reasonably satisfactory to them (as the
Company may  reasonably  request) of the  identity of the  Beneficial  Owner (or
former  Beneficial  Owner)  of  the  Rights  Certificate  or the  Affiliates  or
Associates  thereof,  the Rights  Agent shall  (subject to Section  7(e) hereof)
thereupon  countersign  and  deliver  to the  Person  entitled  thereto a Rights
Certificate  or Rights  Certificates,  as the case may be, as so requested.  The
Company may require payment of a sum sufficient to cover any tax or governmental
charge  that  may  be  imposed  in  connection  with  any  transfer,  split  up,
combination or exchange of Rights Certificates.
     (b) Subject to the  provisions of Sections 7(e),  7(f) and 15 hereof,  upon
receipt by the Company and the Rights Agent of evidence reasonably  satisfactory
to them of the loss,  theft,  destruction or mutilation of a Rights  Certificate
and such additional  evidence of the identity of the Beneficial Owner (or former
Beneficial  Owner) or  Affiliates  or  Associates  thereof as the Company  shall
reasonably request, and, in case of loss, theft or destruction,  of indemnity or
security  reasonably  satisfactory to them, and reimbursement to the Company and
the  Rights  Agent  of all  reasonable  expenses  incidental  thereto,  and upon
surrender  to the Rights Agent and  cancellation  of the Rights  Certificate  if
mutilated,  the Company  shall execute and deliver a new Rights  Certificate  of
like  tenor  to the  Rights  Agent  for  countersignature  and  delivery  to the
registered owner in lieu of the Rights Certificate so lost, stolen, destroyed or
mutilated.
     7. Exercise of Rights; Purchase Price; Expiration Date of Rights.
        -------------------------------------------------------------
     (a)  Subject  to the  provisions  of  Sections  7(e) and 7(f)  hereof,  the
registered  holder of any Rights  Certificate may exercise the Rights  evidenced
thereby  (except as otherwise  provided  herein) in whole or in part at any time
after the Distribution  Date upon presentation of the Rights  Certificate,  with
the  appropriate  form of election to purchase on the reverse  side thereof duly
executed,  to the Rights  Agent at the  principal  office of the  Rights  Agent,
together  with payment of the Purchase  Price for each one  one-thousandth  of a
share of Preferred  Stock (or such other  securities or property as the case may
be) as to which the Rights are exercised, at or prior to the earliest of (i) the
Close of Business on July 25, 2011 (the "Final Expiration Date"),  (ii) the time
at which the Rights are  redeemed as  provided  in Section 24 hereof,  (iii) the
consummation  of a transaction  contemplated by Section 13(d) hereof or (iv) the
time at which the Rights are exchanged as provided in Section 24(c) hereof (such
earliest   time  being   herein   referred   to  as  the   "Expiration   Date").
Notwithstanding  any other provision of this Agreement,  any Person who prior to
the  Distribution  Date  becomes a record  holder of shares of Common  Stock may
exercise all of the rights of a registered  holder of a Rights  Certificate with
respect to the Rights  associated with such shares of Common Stock in accordance
with and subject to the provisions of this  Agreement,  including the provisions
of Section 7(e) hereof,  as of the date such Person  becomes a record  holder of
shares of Common Stock.
     (b) The Purchase Price for each one  one-thousandth of a share of Preferred
Stock pursuant to the exercise of a Right shall initially be Thirty-Five Dollars
($35.00),  shall be  subject  to  adjustment  from time to time as  provided  in
Sections  11 and 13 hereof and shall be  payable  in lawful  money of the United
States of America in accordance with paragraph (c) of this Section 7 below.
     (c) Upon receipt of a Rights Certificate  representing  exercisable Rights,
with the appropriate form of election to purchase duly executed,  accompanied by
payment  of the  Purchase  Price  for the  fractional  interests  in  shares  of
Preferred Stock (or other  securities or property) to be purchased and an amount
equal to any  applicable  transfer tax (as  determined  by the Rights  Agent) in
cash,  or by certified  check or bank draft payable to the order of the Company,
the Rights Agent shall,  subject to Section  21(k)  hereof,  thereupon  promptly
(i)(A)  requisition from any transfer agent of the shares of Preferred Stock (or
make available,  if the Rights Agent is the transfer agent) certificates for the
number of one one-thousandths of a share of Preferred Stock to be purchased, and
the Company hereby irrevocably  authorizes its transfer agent to comply with all
such requests, or (B) if the Company, in its sole discretion, shall have elected
to deposit the fractional  interests in shares of Preferred  Stock issuable upon
exercise  of the  Rights  hereunder  into a  depositary,  requisition  from  the
depositary  agent   depositary   receipts   representing   such  number  of  one
one-thousandths  of a share of Preferred  Stock as are to be purchased (in which
case  certificates  for the one  one-thousandths  of a share of Preferred  Stock
represented  by such receipts  shall be deposited by the transfer agent with the
depositary  agent) and the Company shall direct the  depositary  agent to comply
with such  request,  (ii) when  appropriate,  requisition  from the  Company the
amount of cash, if any, to be paid in lieu of issuance of  fractional  shares in
accordance with Section 15, (iii) promptly after receipt of such certificates or
depositary receipts,  cause the same to be delivered to or upon the order of the
registered holder of such Rights  Certificate,  registered in such name or names
as may be designated by such holder and,  (iv) when  appropriate,  after receipt
promptly deliver such cash to or upon the order of the registered holder of such
Rights  Certificate.  In the event that the Company is  obligated to issue other
securities of the Company,  or  distribute  other  property  pursuant to Section
11(a),  the Company  shall make all  arrangements  necessary  so that such other
securities or property are available for  distribution  by the Rights Agent,  if
and when appropriate. In addition, in the case of an exercise of the Rights by a
holder pursuant to Section 11(a)(ii),  the Rights Agent shall return such Rights
Certificate  to the  registered  holder  thereof after  imprinting,  stamping or
otherwise  indicating  thereon  that  the  rights  represented  by  such  Rights
Certificate no longer include the rights provided by Section  11(a)(ii)  hereof;
provided,  however,  that if less than all the Rights represented by such Rights
Certificate  were so  exercised,  the Rights Agent shall  indicate on the Rights
Certificate the number of Rights  represented  thereby which continue to include
the rights provided by Section 11(a)(ii).
     (d) In case the registered holder of any Rights  Certificate shall exercise
(except  pursuant  to  Section  11(a)(ii))  less than all the  Rights  evidenced
thereby,  a new Rights  Certificate  evidencing  Rights equivalent to the Rights
remaining  unexercised  shall be issued by the Rights Agent and delivered to the
registered holder of such Rights Certificate or to such registered holder's duly
authorized assigns, subject to the provisions of Section 15 hereof.
     (e)  Notwithstanding  anything in this Agreement to the contrary,  if there
occurs any  Triggering  Event,  then any Rights that are or were on or after the
Distribution Date Beneficially  Owned by an Acquiring Person or any Associate or
Affiliate of an Acquiring Person shall become null and void, without any further
action, and any holder of such Rights shall thereafter have no rights whatsoever
with respect to such Rights,  whether under any  provision of this  Agreement or
otherwise. Without limiting the foregoing sentence, Rights held by the following
Persons  shall be null and void  without any further  action:  (i) any direct or
indirect  transferee of any Rights that are or were on or after the Distribution
Date Beneficially  Owned by an Acquiring Person or any Associate or Affiliate of
an Acquiring Person;  (ii) any direct or indirect  transferee of any Rights that
were on or before  the  Distribution  Date  Beneficially  Owned by an  Acquiring
Person or any  Associate or Affiliate of an Acquiring  Person if the  transferee
received such Rights,  directly or indirectly,  (A) from an Acquiring  Person or
any  Associate  or  Affiliate  of an  Acquiring  Person  (x)  as a  result  of a
distribution  by such  Acquiring  Person or any  Associate  or  Affiliate  of an
Acquiring  Person to  holders  of its equity  securities  or  similar  interests
(including,  without limitation,  partnership  interests) or (y) pursuant to any
continuing agreement, arrangement or understanding with respect to the Rights or
(B) in a transfer (or series of transfers) which the Board determines is part of
a plan, arrangement or understanding which has the purpose or effect of avoiding
the provisions of this Section 7(e); and (iii) subsequent transferees of Persons
referred to in the foregoing  clauses (i) and (ii) as well as this clause (iii).
The Company shall use all  reasonable  efforts to ensure that the  provisions of
this Section 7(e) are complied  with,  but shall have no liability to any holder
of Rights or any Rights  Certificate  or to any other  Person as a result of the
Company's failure to make any determination  with respect to an Acquiring Person
or its Affiliates, Associates or transferees hereunder.
     (f) Notwithstanding anything in this Agreement to the contrary, neither the
Rights Agent nor the Company  shall be  obligated  to undertake  any action with
respect to a registered holder upon the occurrence of any purported  exercise as
set forth in this Section 7 unless the Certificate  contained in the appropriate
form of  Election  to  Purchase  set  forth on the  reverse  side of the  Rights
Certificate surrendered for such exercise shall have been properly completed and
duly executed by the  registered  holder thereof and the Company shall have been
provided with such additional  evidence of the identity of the Beneficial  Owner
(or former Beneficial Owner) or Affiliates or Associates  thereof as the Company
shall reasonably request.
     8.  Cancellation  and  Destruction  of  Rights  Certificates.   All  Rights
         --------------------------------------------------------
Certificates  surrendered  for the  purpose  of  exercise,  transfer,  split up,
combination  or  exchange  shall,  if  surrendered  to the Company or any of its
agents,  be delivered to the Rights Agent for  cancellation or in canceled form,
or, if surrendered  to the Rights Agent,  shall be canceled by it, and no Rights
Certificates  shall be issued in lieu thereof  except as expressly  permitted by
any of the provisions of this Agreement. The Company shall deliver to the Rights
Agent for cancellation and retirement,  and the Rights Agent shall so cancel and
retire,  any other  Rights  Certificate  purchased  or  acquired  by the Company
otherwise  than upon the exercise  thereof.  The Rights Agent shall  deliver all
canceled Rights Certificates to the Company, or shall, at the written request of
the Company,  destroy such canceled Rights Certificates,  and in such case shall
deliver a certificate of destruction thereof to the Company.
     9. Reservation and Availability of Preferred Stock.
        -----------------------------------------------
     (a) The Company covenants and agrees that it shall cause to be reserved and
kept available out of its authorized and unissued shares of Preferred  Stock, or
any  authorized  and  issued  shares of  Preferred  Stock  (and,  following  the
occurrence of a Triggering  Event,  shares of Common Stock and other securities)
held in its treasury,  the number of shares of Preferred  Stock (and,  following
the  occurrence  of a  Triggering  Event,  shares  of  Common  Stock  and  other
securities)  that will be sufficient (in accordance  with the provisions of this
Agreement,  including Section  11(a)(iii) hereof) to permit the exercise in full
of all outstanding Rights.
     (b) So long as the shares of Preferred Stock (and, following the occurrence
of a Triggering  Event,  shares of Common Stock and other  securities)  issuable
upon the  exercise  of the  Rights  may be  listed  on any  national  securities
exchange or quoted on any national  quotation system,  the Company shall use its
best  efforts  to  cause,  from  and  after  such  time  as  the  Rights  become
exercisable,  all shares (or other securities)  reserved for such issuance to be
listed on such  exchange  or  quoted  on such  system  upon  official  notice of
issuance upon such exercise.
     (c) If then  required by  applicable  law,  the Company  shall use its best
efforts to (i) file,  as soon as  practicable  following the earliest date after
the  occurrence  of a  Triggering  Event as to  which  the  consideration  to be
delivered  by the  Company  upon  exercise  of the  Rights  has been  determined
pursuant  to this  Agreement,  or as soon as is required  by law  following  the
Distribution  Date,  as the case  may be, a  registration  statement  under  the
Securities  Act of 1933, as amended (the "Act"),  with respect to the securities
purchasable upon exercise of the Rights on an appropriate  form, (ii) cause such
registration  statement to become  effective as soon as  practicable  after such
filing and (iii) cause such  registration  statement to remain effective (with a
prospectus at all times meeting the  requirements  of the Act) until the earlier
of (A) the  date as of which  the  Rights  are no  longer  exercisable  for such
securities,  (B) the  Expiration  Date or (C) the date the  Company  receives an
opinion  of  counsel to the effect  that the  maintenance  of such  registration
statement in effect is no longer necessary.  If then required by applicable law,
the  Company  will  also  take  such  action  as may be  appropriate  under  the
securities or "blue sky" laws of the various states. The Company may temporarily
suspend,  for a period of time not to exceed ninety (90) days after the date set
forth in clause (i) of this Section 9(c),  the  exercisability  of the Rights in
order to prepare  and file such  registration  statement  or to comply with such
blue sky  laws.  Upon any such  suspension,  the  Company  shall  issue a public
announcement  stating that the exercisability of the Rights has been temporarily
suspended.  Notwithstanding any provision of this Agreement to the contrary, the
Rights  shall  not be  exercisable  in any  jurisdiction  unless  the  requisite
qualification in such jurisdiction shall have been obtained.
     (d) The Company  covenants and agrees that it shall take all such action as
may be necessary to ensure that all one  one-thousandths of a share of Preferred
Stock or other  securities  delivered upon exercise of Rights shall, at the time
of delivery of the certificates for such shares or other securities  (subject to
payment of the Purchase  Price),  be duly and validly  authorized and issued and
fully paid and nonassessable shares or securities.
     (e) The Company further covenants and agrees that it shall pay when due and
payable any and all federal and state  transfer  taxes and charges  which may be
payable in respect of the issuance or delivery of the Rights  Certificates or of
any certificates for one  one-thousandths of a share of Preferred Stock or other
securities  upon the  exercise of Rights.  The Company  shall not,  however,  be
required to (i) pay any  transfer  tax or charge which may be payable in respect
of any transfer or delivery of Rights Certificates to a Person other than, or in
respect of the  issuance or delivery of the shares of  Preferred  Stock or other
securities  in a name other than that of,  the  registered  holder of the Rights
Certificates evidencing Rights surrendered for exercise or (ii) issue or deliver
any  certificates  for shares of Preferred  Stock or other  securities in a name
other than that of the  registered  holder upon the exercise of any Rights until
such tax or charge shall have been paid (any such tax or charge being payable by
the holder of such Rights  Certificate at the time of surrender) or until it has
been  established  to the Company's  satisfaction  that no such tax or charge is
due.
     10.  Preferred Stock Record Date. Each Person in whose name any certificate
          ---------------------------
for one  one-thousandths  of a share of Preferred Stock (or other securities) is
issued  upon the  exercise  of Rights  shall for all  purposes be deemed to have
become  the holder of record of the  fractional  shares of  Preferred  Stock (or
other securities)  represented  thereby on, and such certificate shall be dated,
the date upon  which the  Rights  Certificate  evidencing  such  Rights was duly
presented and payment of the Purchase Price (and any  applicable  transfer taxes
or charges) was made; provided,  however,  that if the date of such presentation
and  payment  is a date upon  which the  Preferred  Stock (or other  securities)
transfer  books of the Company are closed,  such Person  shall be deemed to have
become the record holder of such shares on, and such certificate shall be dated,
the next  succeeding  Business  Day on  which  the  Preferred  Stock  (or  other
securities) transfer books of the Company are open. Prior to the exercise of the
Rights evidenced thereby, the holder of a Rights Certificate, as such, shall not
be entitled to any rights of a stockholder of the Company with respect to shares
for which the Rights shall be exercisable,  including,  without limitation,  the
right to vote, to receive  dividends or other  distributions  or to exercise any
preemptive  rights,  and shall not be  entitled  to  receive  any  notice of any
proceedings of the Company, except as provided herein.
     11.  Adjustment of Purchase  Price,  Number and Kind of Shares or Number of
          ----------------------------------------------------------------------
Rights.  The Purchase Price,  the number of shares covered by each Right and the
------
number of Rights  outstanding  are  subject to  adjustment  from time to time as
provided in this Section 11.
     (a) (i) In the event the  Company  shall at any time after the date of this
Agreement  (A) declare a dividend on the  Preferred  Stock  payable in shares of
Preferred Stock, (B) subdivide the outstanding  Preferred Stock, (C) combine the
outstanding  Preferred  Stock  into a smaller  number of shares or (D) issue any
shares  of its  capital  stock  in a  reclassification  of the  Preferred  Stock
(including  any such  reclassification  in connection  with a  consolidation  or
merger in which the Company is the continuing or surviving corporation),  except
as  otherwise  provided in this Section  11(a) and in Section  7(e) hereof,  the
Purchase  Price in effect at the time of the record date for such dividend or of
the effective date of such subdivision, combination or reclassification, and the
number  and kind of shares of capital  stock  issuable  on such  date,  shall be
proportionately  adjusted so that the holder of any Right  exercised  after such
time shall be  entitled to receive  the  aggregate  number and kind of shares of
capital  stock and other  securities  which,  if such  Right had been  exercised
immediately  prior to such date and at a time when the Preferred  Stock transfer
books of the Company were open,  such holder would have owned upon such exercise
and  been  entitled  to  receive  by  virtue  of  such  dividend,   subdivision,
combination  or  reclassification.  If an event  occurs  which would  require an
adjustment  under both this Section  11(a)(i) and Section  11(a)(ii)  hereof the
adjustment  provided for in this Section  11(a)(i)  shall be in addition to, and
shall be made prior to, any adjustment  required  pursuant to Section  11(a)(ii)
hereof.
     (ii) Subject to Section  24(c)  hereof,  in the event any Person,  alone or
together with its Affiliates and  Associates,  shall become an Acquiring  Person
other than  pursuant  to a  Permitted  Offer  (such an event being a "Section 11
Event"),  then,  promptly  following  the first  occurrence of such a Section 11
Event,  proper provision shall be made so that each holder of a Right, except as
provided in Section  7(e) hereof,  shall,  for a period of sixty (60) days after
the later of the  occurrence of any such Section 11 Event and the effective date
of an appropriate  registration  statement pursuant to Section 9 hereof,  have a
right to receive,  upon exercise  thereof at the then current  Purchase Price in
accordance with the terms of this Agreement,  in lieu of fractional interests in
shares of Preferred Stock,  such number of shares of Common Stock of the Company
as shall equal the result obtained by (x) multiplying the then current  Purchase
Price by the number of one  one-thousandths  of a share of  Preferred  Stock for
which a Right was exercisable immediately prior to the Section 11 Event at issue
and (y) dividing that product by fifty percent (50%) of the current market price
per one share of Common Stock  (determined  pursuant to Section 11(d) hereof) on
the date of the  occurrence  of the  Section 11 Event at issue  (such  number of
shares  being  referred  to as the  "number of  Adjustment  Shares");  provided,
however, that if the transaction that would otherwise give rise to the foregoing
adjustment is also subject to the provisions of Section 13 hereof, then only the
provisions  of Section 13 hereof  shall  apply and no  adjustment  shall be made
pursuant to this Section 11(a)(ii); and provided,  further, that such sixty (60)
day period shall not be deemed to run during any period in which the exercise of
the Rights or the fulfillment by the Company or the Rights Agent of its or their
obligations  under this Agreement  shall be enjoined or otherwise  prohibited in
full or in part by any court or other governmental agency or body.
     (iii) In lieu of issuing shares of Common Stock in accordance  with Section
11(a)(ii)  hereof,  the  Company  may, if a majority of the Board then in office
determines  that such action is necessary or appropriate and not contrary to the
interests of holders of Rights,  elect to (and,  in the event that the Board has
not exercised the exchange right contained in Section 24(c) hereof and there are
not sufficient  treasury  shares and  authorized  but unissued  shares of Common
Stock to permit the  exercise in full of the Rights in  accordance  with Section
11(a)(ii) hereof, the Company shall) take all such action as may be necessary to
authorize, issue or pay, upon the exercise of the Rights, cash (including by way
of a reduction of the Purchase Price),  property,  shares of Common Stock, other
securities (whether equity or debt securities of the Company,  any Subsidiary of
the Company,  or otherwise) or any combination thereof having an aggregate value
equal to the value of the shares of Common Stock which otherwise would have been
issuable pursuant to Section  11(a)(ii)  hereof,  which aggregate value shall be
determined  by a nationally  recognized  investment  banking firm  selected by a
majority of the Board. For purposes of the preceding sentence,  the value of the
Common Stock shall be determined  pursuant to Section 11(d) hereof and the value
of any  fractional  interests in  preferred  stock or  preference  stock which a
majority of the Board  determines  to be a "common  stock  equivalent"  shall be
deemed to have the same  value as the Common  Stock.  Any such  election  by the
Board must be made and publicly  announced  within sixty (60) days following the
date on which the Section 11 Event at issue shall have  occurred.  Following the
occurrence of such Section 11 Event,  a majority of the Board then in office may
suspend the  exercisability  of the Rights for a period of up to sixty (60) days
following  the date on which such  Section 11 Event  shall have  occurred to the
extent that such Directors have not determined  whether to exercise their rights
of election under this Section 11(a)(iii).  If the Board shall determine in good
faith that it is likely that  sufficient  additional  shares of Common  Stock or
common stock  equivalents could be authorized for issuance upon exercise in full
of the Rights,  the sixty (60) day period set forth above may be extended to the
extent necessary, but not more than ninety (90) days following the occurrence of
the Section 11 Event at issue,  in order that the  Company may seek  stockholder
approval for the  authorization of such additional  shares.  In the event of any
such suspension,  the Company shall issue a public announcement stating that the
exercisability of the Rights has been temporarily suspended.
     (b) If the  Company  shall fix a record  date for the  issuance  of rights,
options or warrants to all holders of any interests in Preferred Stock entitling
them (for a period  expiring  within  forty-five  (45)  calendar days after such
record date) to subscribe for or purchase any  interests in Preferred  Stock (or
securities having the same or more favorable rights,  privileges and preferences
as the Preferred Stock ("equivalent preferred stock")) or securities convertible
into  Preferred  Stock or  equivalent  preferred  stock at a price  per share of
Preferred  Stock  or per  share  of  equivalent  preferred  stock  (or  having a
conversion  price per share, if a security  convertible  into Preferred Stock or
equivalent  preferred  stock) less than the current  market price (as defined in
Section  11(d)) per share of Preferred  Stock on such record date,  the Purchase
Price to be in effect after such record date shall be determined by  multiplying
the  Purchase  Price  in  effect  immediately  prior  to such  record  date by a
fraction,  the  numerator  of which  shall be the number of shares of  Preferred
Stock  outstanding  on such record date,  plus the number of shares of Preferred
Stock  which  the  aggregate  offering  price of the  total  number of shares of
Preferred  Stock or equivalent  preferred  stock to be offered (or the aggregate
initial  conversion price of the convertible  securities so to be offered) would
purchase at such current market price and the  denominator of which shall be the
number of shares of Preferred  Stock  outstanding on such record date,  plus the
number of additional shares of Preferred Stock or equivalent  preferred stock to
be  offered  for  subscription  or  purchase  (or  into  which  the  convertible
securities  so  to  be  offered  are  initially   convertible).   In  case  such
subscription  price may be paid in a consideration part or all of which shall be
in a form  other  than  cash,  the  value  of  such  consideration  shall  be as
determined reasonably and with good faith to the holders of Rights by the Board,
whose  determination  shall be  described  in a statement  filed with the Rights
Agent and shall be binding on the Rights Agent and  conclusive for all purposes.
Shares of Preferred  Stock owned by or held for the account of the Company shall
not be  deemed  outstanding  for  the  purpose  of any  such  computation.  Such
adjustment shall be made successively  whenever such a record date is fixed; and
in the event that such  rights,  options  or  warrants  are not so  issued,  the
Purchase Price shall be adjusted to be the Purchase Price which would then be in
effect if such record date had not been fixed.
     (c) If the Company shall fix a record date for the making of a distribution
to all holders of interests in Preferred Stock (including any such  distribution
made in connection  with a  consolidation  or merger in which the Company is the
continuing corporation) of evidences of indebtedness, cash (other than a regular
quarterly  cash  dividend  out of  the  earnings  or  retained  earnings  of the
Company),  assets  (other  than a  dividend  payable  in  Preferred  Stock,  but
including  any  dividend  payable  in  stock  other  than  Preferred  Stock)  or
subscription rights, options or warrants (excluding those referred to in Section
11(b)  hereof),  the Purchase Price to be in effect after such record date shall
be determined by multiplying the Purchase Price in effect  immediately  prior to
such record date by a fraction, the numerator of which shall be the then current
market price (as defined in Section 11(d)  hereof) per share of Preferred  Stock
on such record date,  less the fair market value (as  determined  reasonably and
with good faith to the holders of Rights by the Board, whose determination shall
be described in a statement  filed with the Rights Agent and shall be binding on
the Rights Agent and  conclusive  for all  purposes) of the portion of the cash,
assets or evidences of indebtedness so to be distributed or of such subscription
rights,  options or warrants  distributable in respect of one share of Preferred
Stock and the  denominator  of which shall be the then current  market price (as
defined  in  Section  11(d)  hereof)  per  share of the  Preferred  Stock.  Such
adjustments shall be made successively whenever such a record date is fixed; and
in the event that such  distribution  is not so made,  the Purchase  Price shall
again be  adjusted  to be the  Purchase  Price  which would be in effect if such
record date had not been fixed.
     (d)  (i) For the purpose of any computation  hereunder,  other than as
provided in Section  11(a)(iii)  hereof, the "current market price" per share of
Common Stock on any date shall be deemed to be the average of the daily  closing
prices per share of such Common  Stock for the thirty (30)  consecutive  Trading
Days (as such  term is  hereinafter  defined)  immediately  prior to such  date;
provided,  however, that in the event that the current per share market price of
the Common Stock is determined in whole or in part during a period following the
announcement  by  the  issuer  of  such  Common  Stock  of  (A)  a  dividend  or
distribution  on such Common  Stock  payable in shares of such  Common  Stock or
securities  convertible into shares of such Common Stock or (B) any subdivision,
combination  or  reclassification  of  such  Common  Stock,  and  prior  to  the
expiration  of thirty  (30)  Trading  Days after the  ex-dividend  date for such
dividend or distribution,  or the record date for such subdivision,  combination
or  reclassification,  then, and in each such case,  the "current  market price"
shall be properly adjusted to take into account ex-dividend trading. The closing
price for each day shall be the last sale  price,  regular  way,  or, in case no
such sale takes  place on such day,  the  average of the  closing  bid and asked
prices,  regular way, in either case as reported in the  principal  consolidated
transaction  reporting  system with respect to securities  listed or admitted to
trading on the New York Stock Exchange or, if the shares of Common Stock are not
listed or admitted to trading on the New York Stock Exchange, as reported in the
principal  consolidated  transaction reporting system with respect to securities
listed on the  principal  national  securities  exchange  on which the shares of
Common Stock are listed or admitted to trading or, if the shares of Common Stock
are not listed or admitted to trading on any  national  securities  exchange but
are listed or quoted on The Nasdaq Stock  Market,  the last reported sale price,
or, in case no such sale takes place on such day, the average of the closing bid
and asked  prices as reported by Nasdaq,  or, if the shares of Common  Stock are
not listed or quoted on The Nasdaq  Stock  Market,  the last quoted price or, if
not so  quoted,  the  average  of the  high  bid and  low  asked  prices  in the
over-the-counter  market,  as reported by the OTC  Bulletin  Board or such other
system then in use,  or, if on any such date the shares of Common  Stock are not
quoted by any such organization, the average of the closing bid and asked prices
as furnished by a professional  market maker making a market in the Common Stock
selected by the Board. If on any such date no market maker is making a market in
the  Common  Stock,  the fair  value of such  shares on such date as  determined
reasonably  and with good faith by the Board  shall be used and shall be binding
on the Rights Agent and  conclusive  for all  purposes.  The term  "Trading Day"
shall mean a day on which the  principal  national  securities  exchange  or The
Nasdaq Stock Market, as the case may be, on which the shares of Common Stock are
principally  listed or admitted to trading or quoted is open for the transaction
of  business  or, if the shares of Common  Stock are not listed or  admitted  to
trading  or quoted on any  national  securities  exchange  or The  Nasdaq  Stock
Market,  a Business  Day.  If the Common  Stock is not  publicly  held or not so
listed or traded, "current market price" per share shall mean the fair value per
share determined  reasonably and with good faith to the holders of Rights by the
Board,  whose  determination  shall be described  in a statement  filed with the
Rights  Agent and shall be binding on the Rights  Agent and  conclusive  for all
purposes.
     (ii) For the purpose of any  computation  hereunder,  the  "current  market
price" per share (or one  one-thousandth of a share) of Preferred Stock shall be
determined in the same manner as set forth above for the Common Stock in Section
11(d)(i) (other than the last sentence thereof). If the current market price per
share (or one one-thousandth of a share) of Preferred Stock cannot be determined
in the manner  provided above or if the Preferred  Stock is not publicly held or
listed or traded in a manner described in Section 11(d)(i),  the "current market
price" per share of Preferred Stock shall be conclusively deemed to be an amount
equal to 1,000 (as such number may be appropriately  adjusted for such events as
stock splits,  stock dividends and  recapitalization  with respect to the Common
Stock  occurring  after the date of this  Agreement)  multiplied  by the current
market price per share of the Common Stock and the  "current  market  price" per
one  one-thousandth  of a share of Preferred Stock shall be equal to the current
market  price per share of the  Common  Stock (as  appropriately  adjusted).  If
neither the Common Stock nor the  Preferred  Stock is publicly held or so listed
or traded,  "current market price" per share shall mean the fair value per share
as determined in good faith by the Board, whose determination shall be described
in a  statement  filed with the  Rights  Agent and shall be  conclusive  for all
purposes.
     (e) Anything herein to the contrary notwithstanding, no adjustment in the
Purchase Price shall be required unless such adjustment would require an
increase or decrease of at least one percent (1%) in the Purchase Price;
provided, however, that any adjustments which by reason of this Section 11(e)
are not required to be made shall be carried forward and taken into account in
any subsequent adjustment. All calculations under this Section 11 shall be made
to the nearest cent or to the nearest thousandth of a share of Common Stock or
other share or one-millionth of a share of Preferred Stock, as the case may be.
Notwithstanding the first sentence of this Section 11(e), any adjustment
required by this Section 11 shall be made no later than the earlier of (i) three
(3) years from the date of the transaction which mandates such adjustment or
(ii) the Expiration Date.
     (f) If as a result of any  provision  of this Section 11, the holder of any
Right  shall  become  entitled  to receive  any  shares of capital  stock of the
Company other than Preferred  Stock,  thereafter the number of such other shares
so receivable  upon  exercise of any Right shall be subject to  adjustment  from
time to time in a manner and on terms as nearly equivalent as practicable to the
provisions with respect to the shares (and the related Purchase Price) contained
in this  Section 11, and the  provisions  of Sections 7, 9, 10, 13 and 15 hereof
with respect to the Preferred  Stock shall apply on like terms to any such other
shares.
     (g)  All  Rights  originally  issued  by  the  Company  subsequent  to  any
adjustment  made to the Purchase  Price  hereunder  shall  evidence the right to
purchase, at the adjusted Purchase Price, the number of one one-thousandths of a
share of Preferred Stock  purchasable  from time to time hereunder upon exercise
of the Rights, all subject to further adjustment as provided herein.
     (h) Unless the Company  shall have  exercised  its  election as provided in
Section 11(i) hereof,  upon each adjustment of the Purchase Price as a result of
the calculations  made in Section 11(b) and (c) hereof,  each Right  outstanding
immediately prior to the making of such adjustment shall thereafter evidence the
right  to  purchase,  at  the  adjusted  Purchase  Price,  that  number  of  one
one-thousandths  of a  share  of  Preferred  Stock  (calculated  to the  nearest
one-millionth) obtained by (i) multiplying (x) the number of one one-thousandths
of a share of  Preferred  Stock  covered  by a Right  immediately  prior to this
adjustment  by (y) the  Purchase  Price  in  effect  immediately  prior  to such
adjustment  of the Purchase  Price and (ii)  dividing the product so obtained by
the Purchase Price in effect  immediately  after such adjustment of the Purchase
Price.
     (i) The  Company  may elect on or after the date of any  adjustment  of the
Purchase  Price  to  adjust  the  number  of  Rights,  in  substitution  for any
adjustment in the number of one  one-thousandths  of a share of Preferred  Stock
purchasable upon the exercise of a Right.  Each of the Rights  outstanding after
the  adjustment in the number of Rights shall be  exercisable  for the number of
one  one-thousandths  of a share  of  Preferred  Stock  for  which  a Right  was
exercisable  immediately  prior to such  adjustment.  Each  Right held of record
prior to such  adjustment  of the number of Rights  shall  become that number of
Rights  (calculated  to the nearest  one  millionth)  obtained  by dividing  the
Purchase Price in effect  immediately  prior to adjustment of the Purchase Price
by the Purchase  Price in effect  immediately  after  adjustment of the Purchase
Price.  The Company shall make a public  announcement  of its election to adjust
the number of Rights,  indicating  the record date for the  adjustment,  and, if
known at the time, the amount of the adjustment to be made. This record date may
be the date on which the Purchase Price is adjusted or any day thereafter,  but,
if the Rights  Certificates  have been  issued,  shall be at least ten (10) days
later than the date of the public announcement. If Rights Certificates have been
issued,  upon each  adjustment of the number of Rights  pursuant to this Section
11(i), the Company shall, as promptly as practicable, cause to be distributed to
holders of record of Rights Certificates on such record date Rights Certificates
evidencing,  subject to Section 15 hereof,  the additional  Rights to which such
holders shall be entitled as a result of such  adjustment,  or, at the option of
the  Company,  shall  cause to be  distributed  to such  holders  of  record  in
substitution  and replacement for the Rights  Certificates  held by such holders
prior to the date of adjustment,  and upon surrender thereof, if required by the
Company, new Rights Certificates evidencing all the Rights to which such holders
shall  be  entitled  after  such  adjustment.   Rights  Certificates  so  to  be
distributed  shall be issued,  executed and countersigned in the manner provided
for herein (and may bear,  at the option of the Company,  the adjusted  Purchase
Price) and shall be  registered  in the names of the holders of record of Rights
Certificates on the record date specified in the public announcement.
     (j)  Irrespective  of any adjustment or change in the Purchase Price or the
number of one  one-thousandths  of a share of Preferred  Stock issuable upon the
exercise of the  Rights,  the Rights  Certificates  theretofore  and  thereafter
issued may continue to express the Purchase Price per one  one-thousandths  of a
share and the number of one  one-thousandths  of a share which were expressed in
the initial Rights Certificates issued hereunder.
     (k) Before  taking any action that would cause an  adjustment  reducing the
Purchase  Price  below  the  then  par  value,  if  any,  of the  number  of one
one-thousandths of a share of Preferred Stock or shares of Common Stock or other
securities issuable upon exercise of the Rights (aggregating,  for this purpose,
an appropriate  amount of the Purchase  Price for  fractional  shares to compare
such  aggregated  amount to the par value for a whole share),  the Company shall
take any corporate action which may, in the opinion of its counsel, be necessary
in  order  that the  Company  may  validly  and  legally  issue  fully  paid and
nonassessable  one  one-thousandths  of a share of Preferred  Stock or shares of
Common Stock or other  securities at such adjusted  Purchase  Price. If upon any
exercise of the Rights, a holder is to receive a combination of Common Stock and
common stock equivalents,  or Preferred Stock and preferred stock equivalents, a
portion of the consideration paid upon such exercise, equal to at least the then
par value, if any, of a share of Common Stock or Preferred Stock of the Company,
as the case may be,  shall be  allocated as the payment for each share of Common
Stock or Preferred Stock of the Company, as the case may be, so received.
     (l) In any case in which this Section 11 shall  require that an  adjustment
in the  Purchase  Price be made  effective  as of a record  date for a specified
event,  the Company may elect to defer  until the  occurrence  of such event the
issuing to the holder of any Right  exercised  after such record date the shares
of Preferred Stock and other capital stock or securities of the Company, if any,
issuable  upon such  exercise  over and above the shares of Preferred  Stock and
other capital stock or  securities  of the Company,  if any,  issuable upon such
exercise on the basis of the Purchase Price in effect prior to such  adjustment;
provided,  however,  that the Company shall deliver to such holder a due ββββ or
other  appropriate  instrument  evidencing  such holder's  right to receive such
additional shares upon the occurrence of the event requiring such adjustment.
     (m)  Anything  to the  contrary  in this  Section 11  notwithstanding,  the
Company  shall be entitled to make such  reductions  in the Purchase  Price,  in
addition to those adjustments  expressly  required by this Section 11, as and to
the extent that it in its sole  discretion  shall  determine  to be advisable in
order that any  consolidation  or subdivision of the Preferred  Stock,  issuance
wholly for cash of any shares of Preferred Stock at less than the current market
price, issuance wholly for cash of shares of Preferred Stock or securities which
by their terms are  convertible  into or  exchangeable  for shares of  Preferred
Stock,  stock dividends or issuance of rights,  options or warrants  referred to
hereinabove  in this  Section  11,  hereafter  made by the Company to holders of
Preferred Stock shall not be taxable to such stockholders.
     (n)  Anything in this  Agreement to the  contrary  notwithstanding,  in the
event that the Company  shall at any time after the date of this  Agreement  and
prior to the Distribution Date (i) declare a dividend on the outstanding  shares
of  Common  Stock  payable  in  shares  of  Common  Stock,  (ii)  subdivide  the
outstanding  Common  Stock,  (iii) combine the  outstanding  Common Stock into a
smaller  number of shares,  or (iv) issue any shares of its  capital  stock in a
reclassification   of  the  outstanding  Common  Stock,  the  number  of  Rights
associated  with  each  share of Common  Stock  then  outstanding,  or issued or
delivered   thereafter   but   prior  to  the   Distribution   Date,   shall  be
proportionately adjusted so that the number of Rights thereafter associated with
each  share of Common  Stock  following  any such event  shall  equal the result
obtained  by  multiplying  the  number of Rights  associated  with each share of
Common  Stock  immediately  prior to such event by a fraction  the  numerator of
which  shall  be  the  total  number  of  shares  of  Common  Stock  outstanding
immediately  prior to the  occurrence of the event and the  denominator of which
shall be the total  number of shares  of Common  Stock  outstanding  immediately
following the occurrence of such event.
     (o) The exercise of Rights under Section 11(a)(ii) hereof shall only result
in the loss of rights under Section  11(a)(ii) hereof to the extent so exercised
and shall not otherwise  affect the rights  represented by the Rights under this
Agreement, including the rights represented by Section 13 hereof.
     12. Certificate of Adjusted Purchase Price or Number of Shares. Whenever an
         ----------------------------------------------------------
adjustment  is made as provided in Sections 11 or 13 hereof,  the Company  shall
(a) promptly  prepare a certificate  setting forth such  adjustment  and a brief
statement of the facts  accounting for such  adjustment,  (b) promptly file with
the Rights Agent and with each transfer  agent for the  Preferred  Stock and the
Common Stock a copy of such  certificate and (c) mail a brief summary thereof to
each holder of a Rights  Certificate in accordance  with Section 26 hereof.  The
Rights Agent shall be fully protected in relying on any such  certificate and on
any  adjustment  therein  contained and shall not be deemed to have knowledge of
any  adjustment  unless  and  until it shall  have  received  such  certificate.
Notwithstanding the foregoing  provisions of this Section 12, the failure of the
Company  to make such  certification  or give such  notice  shall not affect the
validity, or the force or effect, of the requirement for such adjustment.
     13. Consolidation, Merger or Sale or Transfer of Assets or Earning Power.
         --------------------------------------------------------------------
     (a) In the event that,  following the Stock Acquisition  Date,  directly or
indirectly,  (x) the Company shall consolidate with, or merge with and into, any
other Person,  (y) any Person shall consolidate with the Company,  or merge with
and into the  Company  and the  Company  shall be the  continuing  or  surviving
corporation of such merger (other than, in the case of any transaction described
in (x) or (y), a merger or consolidation which would result in all of the Voting
Power represented by the securities of the Company outstanding immediately prior
thereto  continuing to represent  (either by remaining  outstanding  or by being
converted  into  securities  of the  surviving  entity) all of the Voting  Power
represented  by  the  securities  of  the  Company  or  such  surviving   entity
outstanding  immediately  after such merger or consolidation  and the holders of
such securities not having changed as a result of such merger or consolidation),
or (z) the Company shall sell, mortgage or otherwise transfer (or one or more of
its Subsidiaries  shall sell,  mortgage or otherwise  transfer),  in one or more
transactions,  assets or earning power aggregating more than fifty percent (50%)
of the assets or earning power of the Company and its  Subsidiaries  (taken as a
whole) to any other Person (any of the events described in the foregoing clauses
(x), (y) or (z) being herein referred to as a "Section 13 Event"),  then, and in
each such  case,  proper  provision  shall be made so that (i) each  holder of a
Right (other than as provided in Section  7(e)  hereof)  shall have the right to
receive, upon the exercise thereof at the then current Purchase Price in
accordance  with the terms of this  Agreement,  such  number of shares of freely
tradable Common Stock of the Principal Party (as hereinafter defined),  free and
clear of liens,  rights of call or first refusal,  encumbrances or other adverse
claims,  as shall be equal to the result  obtained by (x)  multiplying  the then
current  Purchase  Price  by the  number  of one  one-thousandths  of a share of
Preferred  Stock  for which a Right is then  exercisable  (without  taking  into
account any adjustment previously made pursuant to Section 11(a)(ii) hereof) and
(y) dividing that product by fifty percent (50%) of the current market price per
share of the  Common  Stock of such  Principal  Party  (determined  pursuant  to
Section 11(d) hereof) on the date of consummation of such consolidation, merger,
sale or transfer;  (ii) such Principal Party shall thereafter be liable for, and
shall assume, by virtue of such consolidation, merger, sale or transfer, all the
obligations and duties of the Company pursuant to this Agreement; (iii) the term
"Company" shall  thereafter be deemed to refer to such Principal Party, it being
specifically  intended  that the  provisions of Section 11 hereof shall apply to
such  Principal  Party;  and (iv) such  Principal  Party  shall  take such steps
(including, but not limited to, the reservation of a sufficient number of shares
of its Common Stock in accordance with Section 9 hereof) in connection with such
consummation  as may be  necessary  to ensure that the  provisions  hereof shall
thereafter be  applicable,  as nearly as  reasonably  may be, in relation to its
shares of Common Stock thereafter deliverable upon the exercise of the Rights.
     (b) "Principal Party" shall mean:
     (i) in the case of any  transaction  described in clauses (x) or (y) of the
first  sentence  of this  Section  13,  the  Person  that is the  issuer  of any
securities  into which  shares of Common  Stock of the Company are  converted in
such merger or  consolidation,  and if no securities  are so issued,  the Person
that  is  the  other  party  to  the  merger  or  consolidation  (including,  if
applicable, the Company, if it is the surviving corporation); and
     (ii) in the case of any  transaction  described  in clause (z) of the first
sentence in this Section 13, the Person that is the party receiving the greatest
portion of the assets or earning power transferred  pursuant to such transaction
or  transactions;  provided,  however,  that in any such case, (A) if the Common
Stock of such Person is not at such time and has not been  continuously over the
preceding  twelve (12) month period  registered under Section 12 of the Exchange
Act, and such Person is a direct or indirect  Subsidiary or Affiliate of another
Person  the  Common  Stock of which  is and has been so  registered,  "Principal
Party"  shall  refer  to  such  other  Person;  (B) in  case  such  Person  is a
Subsidiary,  directly or indirectly,  or Affiliate of more than one Person,  the
Common Stock of two or more of which are and have been so registered, "Principal
Party"  shall  refer to  whichever  of such  Persons is the issuer of the Common
Stock having the greatest aggregate market value; and (C) in case such Person is
owned, directly or indirectly,  by a joint venture formed by two or more Persons
that are not owned,  directly or indirectly,  by the same Person,  the rules set
forth  in  clauses  (A) and (B)  above  shall  apply  to each of the  chains  of
ownership having an interest in such joint venture as if such joint venture were
a Subsidiary of each such joint venturer and the Principal  Parties in each such
chain shall bear the  obligations set forth in this Section 13 in the same ratio
as their  direct or indirect  interests in such Person bear to the total of such
interests.
     (c) The  Company  shall not  consummate  any  Section  13 Event  unless the
Principal  Party  shall have a  sufficient  number of  authorized  shares of its
Common  Stock that have not been issued or reserved  for  issuance to permit the
exercise  in full of the Rights in  accordance  with this  Section 13 and unless
prior thereto the Company and each Principal Party and each other Person who may
become a  Principal  Party as a  result  of such  Section  13 Event  shall  have
executed and delivered to the Rights Agent a  supplemental  agreement  providing
for the terms set forth in paragraphs (a) and (b) of this Section 13 and further
providing that, as soon as practicable  after the date of such Section 13 Event,
the Principal Party at its own expense shall:
     (i) prepare and file a registration statement under the Act with respect to
the Rights and the  securities  purchasable  upon  exercise  of the Rights on an
appropriate form, will use its best efforts to cause such registration statement
to become  effective as soon as  practicable  after such filing and will use its
best efforts to cause such  registration  statement to remain  effective (with a
prospectus  at all  times  meeting  the  requirements  of  the  Act)  until  the
Expiration Date;
     (ii) use its best  efforts to (x)  qualify or  register  the Rights and the
securities  purchasable  upon  exercise of the Rights under the blue sky laws of
such  jurisdictions  as may be necessary or appropriate and (y) cause the Rights
and the securities  purchasable  upon exercise of the Rights to be listed on any
national  securities exchange or national quotation system upon which its Common
Stock is listed, traded or quoted; and
     (iii) deliver to holders of the Rights historical  financial statements for
the  Principal  Party and each of its  Affiliates  that  comply in all  material
respects with the  requirements  for  registration on Form 10 under the Exchange
Act.
The provisions of this Section 13 shall similarly apply to successive mergers or
consolidations  or sales or other  transfers.  The rights  under this Section 13
shall be in  addition  to the rights to exercise  Rights and  adjustments  under
Section 11(a)(ii) hereof and shall survive any exercise thereunder.
     (d)  Notwithstanding  anything  in this  Agreement  to the  contrary,  this
Section 13 shall not be applicable to a transaction  described in clauses (x) or
(y) of Section 13(a) hereof if (i) such  transaction is (x)  consummated  with a
Person or Persons who acquired  shares of Common  Stock  pursuant to a Permitted
Offer (or a wholly  owned  Subsidiary  of any such  Person or  Persons)  and (y)
related  to such  Permitted  Offer,  (ii) the price  per  share of Common  Stock
offered in such transaction is not less than the price per share of Common Stock
paid to all holders of Common Stock whose shares were purchased pursuant to such
Permitted  Offer  and  (iii)  the form of  consideration  being  offered  to the
remaining  holders of Common Stock  pursuant to such  transaction is the same as
the  form  of  consideration   paid  pursuant  to  such  Permitted  Offer.  Upon
consummation  of any such  transaction  contemplated by this subsection (d), all
Rights hereunder shall expire.
     14. Additional Covenants.
         --------------------
     (a) The Company  covenants and agrees that after the Stock Acquisition Date
it shall not (i)  consolidate  with,  (ii)  merge  with or into or (iii) sell or
transfer to any other  Person,  in one or more  transactions,  assets or earning
power  aggregating  more than fifty percent (50%) of the assets or earning power
of the Company and its Subsidiaries taken as a whole, if at the time of or after
such consolidation, merger or sale there are any charter or by-law provisions or
any rights,  warrants or other instruments outstanding or any other action taken
which would diminish or otherwise eliminate the benefits intended to be afforded
by the Rights. The Company shall not consummate any such  consolidation,  merger
or sale  unless  prior  thereto the  Company  and such other  Person  shall have
executed and delivered to the Rights Agent a supplemental  agreement  evidencing
compliance with this subsection.
     (b) The Company  covenants  and agrees  that,  after the Stock  Acquisition
Date, it will not, except as permitted by Section 24 hereof, take any action the
purpose or effect of which is to diminish or  otherwise  eliminate  the benefits
intended to be afforded by the Rights.
     15. Fractional Rights and Fractional Shares.
         ---------------------------------------
     (a) The Company shall not be required to issue fractions of Rights,  except
prior to the  Distribution  Date as  provided  in Section  11(n)  hereof,  or to
distribute Rights Certificates which evidence fractional Rights. In lieu of such
fractional  Rights,  there shall be paid to the registered holders of the Rights
Certificates  with regard to which such  fractional  Rights  would  otherwise be
issuable,  an amount in cash equal to the same  fraction of the  current  market
value of a whole  Right.  For the purposes of this  Section  15(a),  the current
market value of a whole Right shall be (except as otherwise provided in the last
sentence of this Section  15(a)) the closing price of the Rights for the Trading
Day  immediately  prior to the date on which such  fractional  Rights would have
been  otherwise  issuable.  The closing price of the Rights for any day shall be
the last sale price, the last quoted price or, if not so quoted,  the average of
the high bid and low asked prices in the over-the-counter market, as reported by
The Nasdaq Stock Market or such other system then in use or, if on any such date
the Rights are not quoted by any such  organization,  the average of the closing
bid and asked prices as furnished by a professional market maker making a market
in the Rights selected by the Board. If on any such date no such market maker is
making a market  in the  Rights,  the fair  value of the  Rights on such date as
determined  reasonably and with good faith to the holders of Rights by the Board
shall be used and shall be binding on the Rights  Agent and  conclusive  for all
purposes.
     (b) The  Company  shall not be  required  to issue  fractions  of shares of
Preferred  Stock  (other than  fractions  which are  integral  multiples  of one
one-thousandth  of a share of Preferred Stock) upon exercise of the Rights or to
distribute  certificates  which evidence  fractional  shares of Preferred  Stock
(other than fractions which are integral  multiples of one  one-thousandth  of a
share of Preferred  Stock).  Fractions of shares of Preferred  Stock in integral
multiples  of one  one-thousandth  of a share of  Preferred  Stock  may,  at the
election of the Company,  be evidenced by  depositary  receipts,  pursuant to an
appropriate  agreement  between  the Company  and a  depositary  selected by it,
provided that such agreement  shall provide that the holders of such  depositary
receipts shall have all the rights, privileges and preferences to which they are
entitled as beneficial owners of the fractional interests in shares of Preferred
Stock represented by such depositary  receipts.  In lieu of fractional shares of
Preferred Stock that are not integral multiples of one one-thousandth of a share
of  Preferred  Stock,  the Company may pay to the  registered  holders of Rights
Certificates  at the time such Rights are exercised as herein provided an amount
in  cash  equal  to  the  same  fraction  of the  current  market  value  of one
one-thousandth  of a share of  Preferred  Stock.  For  purposes of this  Section
15(b),  the current market value of one  one-thousandth  of a share of Preferred
Stock shall be  determined  in the manner set forth in Section  11(d) hereof for
the Trading Day immediately prior to the date of such exercise.
     (c) Following the occurrence of a Triggering  Event,  the Company shall not
be required to issue  fractions of shares of Common  Stock upon  exercise of the
Rights or to distribute  certificates which evidence fractional shares of Common
Stock. In lieu of fractional  shares of Common Stock, the Company may pay to the
registered holders of Rights  Certificates at the time such Rights are exercised
as herein  provided an amount in cash equal to the same  fraction of the current
market value of a share of Common Stock. For purposes of this Section 15(c), the
current  market  value  shall be  determined  in the manner set forth in Section
11(d) hereof for the Trading Day immediately prior to the date of such exercise.
     (d) Except as otherwise expressly provided herein, the holder of a Right by
the acceptance of the Right expressly  waives such holder's right to receive any
fractional Rights or any fractional shares (other than, in the case of Preferred
Stock,  fractions which are integral  multiples of one one-thousandth of a share
of Preferred Stock) upon exercise of a Right.
     16.  Rights of Action.  All rights of action in respect of this  Agreement,
          ----------------
except those rights of action vested in the Rights Agent pursuant to Section 21,
are vested in the respective registered holders of the Rights Certificates (and,
prior to the Distribution Date, the registered holders of the Common Stock); and
any registered  holder of any Rights  Certificate (or, prior to the Distribution
Date,  of the Common  Stock),  without the consent of the Rights Agent or of the
holder of any other Rights  Certificate (or, prior to the Distribution  Date, of
the Common  Stock),  may, in such  holder's own behalf and for such holder's own
benefit,  enforce, and may institute and maintain any suit, action or proceeding
against the Company to enforce,  or otherwise  act in respect of, such  holder's
right to exercise the Rights evidenced by such Rights  Certificate in the manner
provided in such Rights Certificate and in this Agreement.  Without limiting the
foregoing or any remedies available to the holders of Rights, it is specifically
acknowledged that the holders of Rights would not have an adequate remedy at law
for any breach of this  Agreement and shall be entitled to specific  performance
of the obligations  hereunder and injunctive relief against actual or threatened
violations of the obligations hereunder of any Person subject to this Agreement.
Holders  of  Rights  shall be  entitled  to  recover  the  reasonable  costs and
expenses,  including  attorneys' fees, incurred by them in any action to enforce
the provisions of this Agreement.
     17.  Agreement of Rights Holders.  Every holder of a Right by accepting the
          ---------------------------
same  consents  and agrees with the Company and the Rights  Agent and with every
other holder of a Right that:
     (a) prior to the Distribution Date, the Rights will be transferable only in
connection with the transfer of Common Stock;
     (b) after the Distribution  Date, the Rights  Certificates are transferable
only on the registry  books of the Rights Agent and only if  surrendered  at the
principal  office of the Rights Agent,  duly endorsed or accompanied by a proper
instrument of transfer and with the appropriate forms and certificates attached;
     (c) the Company and the Rights Agent may deem and treat the Person in whose
name a Rights  Certificate (or, prior to the  Distribution  Date, the associated
Common Stock certificate) is registered as the absolute owner thereof and of the
Rights evidenced thereby  (notwithstanding any notations of ownership or writing
on the Rights  Certificates or the associated  Common Stock  certificate made by
anyone other than the Company or the Rights Agent) for all purposes  whatsoever,
and neither the Company nor the Rights  Agent shall be affected by any notice to
the contrary; and
     (d) notwithstanding anything in this Agreement to the contrary, neither the
Company nor the Rights  Agent shall have any  liability to any holder of a Right
or other Person as a result of the  inability of the Company or the Rights Agent
to perform any of its or their obligations under this Agreement by reason of any
preliminary or permanent injunction or other order, decree or ruling issued by a
court  of  competent   jurisdiction   or  by  a   governmental,   regulatory  or
administrative  agency  or  commission,  or any  statute,  rule,  regulation  or
executive order promulgated or enacted by any governmental authority prohibiting
or otherwise restraining performance of such obligation; provided, however, that
the Company must use its best  efforts to have any such order,  decree or ruling
lifted or otherwise overturned as soon as possible.
     18. Rights Certificate Holder Not Deemed a Stockholder. No holder, as such,
         --------------------------------------------------
of any Rights  Certificate  shall be entitled to vote,  receive  dividends or be
deemed for any purpose the holder of the shares of Preferred Stock, Common Stock
or any other  securities  of the Company  which may at any time be issuable upon
exercise of the Rights represented  thereby, nor shall anything contained herein
or in any  Rights  Certificate  be  construed  to confer  upon the holder of any
Rights  Certificate,  as such, any of the rights of a stockholder of the Company
or any right to vote for the election of directors or upon any matter  submitted
to stockholders at any meeting  thereof,  or to give or withhold  consent to any
corporate  action,  or to receive notice of meetings or other actions  affecting
stockholders  (except as provided in Section 25 hereof), or to receive dividends
or subscription  rights,  or otherwise,  until the Right or Rights  evidenced by
such  Rights  Certificate  shall  have been  exercised  in  accordance  with the
provisions thereof.
     19. Concerning the Rights Agent.
         ---------------------------
     (a) The Company agrees to pay to the Rights Agent  reasonable  compensation
for all services  rendered by it hereunder  and, from time to time, on demand of
the Rights Agent, its reasonable expenses and counsel fees and disbursements and
other  disbursements  incurred  in the  administration  and  execution  of  this
Agreement and the exercise and performance of its duties hereunder.  The Company
also agrees to indemnify the Rights Agent for, and to hold it harmless  against,
any loss,  liability,  or expense,  incurred  without  negligence,  bad faith or
willful misconduct on the part of the Rights Agent, for anything done or omitted
by the Rights Agent in connection with the acceptance and administration of this
Agreement,  including  the costs and expenses of defending  against any claim of
liability  arising  therefrom,   directly  or  indirectly.  The  indemnification
provided for hereunder shall survive the expiration of the Rights and the
termination of this Agreement. The costs and expenses incurred in enforcing this
right of indemnification shall be paid by the Company.
     (b) The Rights Agent shall be protected and shall incur no liability for or
in respect of any action taken, suffered or omitted by it in connection with its
administration  of this  Agreement in reliance  upon any Rights  Certificate  or
certificate for Common Stock or for other securities of the Company,  instrument
of assignment or transfer, power of attorney,  endorsement,  affidavit,  letter,
notice, direction,  consent,  certificate,  statement or other paper or document
believed by it to be genuine and to be signed,  executed and,  where  necessary,
verified or acknowledged by the proper Person or Persons.
     20. Merger or Consolidation or Change of Name of Rights Agent.
         ---------------------------------------------------------
     (a) Any Person into which the Rights  Agent or any  successor  Rights Agent
may be merged or with which it may be consolidated, or any Person resulting from
any merger or  consolidation  to which the Rights Agent or any successor  Rights
Agent  shall be a party,  or any Person  succeeding  to the  corporate  trust or
stockholder services business of the Rights Agent or any successor Rights Agent,
shall be the  successor  to the Rights  Agent under this  Agreement  without the
execution  or filing of any paper or any  further  act on the part of any of the
parties hereto, provided that such Person would be eligible for appointment as a
successor Rights Agent under the provisions of Section 22 hereof. In case at the
time such  successor  Rights Agent shall  succeed to the agency  created by this
Agreement,  any of the Rights Certificates shall have been countersigned but not
delivered, any such successor Rights Agent may adopt the countersignature of the
predecessor Rights Agent and deliver such Rights  Certificates so countersigned;
and in case at that  time any of the  Rights  Certificates  shall  not have been
countersigned,   any  successor   Rights  Agent  may  countersign   such  Rights
Certificates  either  in the  name  of the  predecessor  or in the  name  of the
successor  Rights Agent;  and in all such cases such Rights  Certificates  shall
have the full force provided in the Rights Certificates and in this Agreement.
     (b) In case at any time the name of the Rights  Agent  shall be changed and
at such time any of the Rights  Certificates  shall have been  countersigned but
not delivered,  the Rights Agent may adopt the countersignature  under its prior
name and deliver Rights Certificates so countersigned;  and in case at that time
any of the Rights  Certificates  shall not have been  countersigned,  the Rights
Agent may countersign  such Rights  Certificates  either in its prior name or in
its changed name; and in all such cases such Rights  Certificates shall have the
full force provided in the Rights Certificates and in this Agreement.
     21.  Duties of Rights  Agent.  The Rights Agent  undertakes  the duties and
          -----------------------
obligations  imposed by this Agreement upon the following  terms and conditions,
by all of which the  Company and the  holders of Rights  Certificates,  by their
acceptance thereof, shall be bound:
     (a) The Rights Agent may consult with legal counsel selected by it (who may
be legal counsel for the Company), and the opinion of such counsel shall be full
and complete  authorization  and protection to the Rights Agent as to any action
taken or omitted by it in good faith and in accordance with such opinion.
     (b)  Whenever in the  performance  of its duties under this  Agreement  the
Rights  Agent  shall  deem it  necessary  or  desirable  that any fact or matter
(including,  without  limitation,  the identity of any Acquiring  Person and the
determination  of current  market price) be proved or established by the Company
prior to taking or suffering any action  hereunder,  such fact or matter (unless
other evidence in respect thereof shall be herein  specifically  prescribed) may
be deemed to be conclusively  proved and established by a certificate  signed by
the Chief  Executive  Officer,  the  President,  any Vice  President,  the Chief
Financial Officer, the Treasurer,  any Assistant Treasurer, the Secretary or any
Assistant  Secretary of the Company and delivered to the Rights Agent;  and such
certificate shall be full authorization to the Rights Agent for any action taken
or  suffered  in good  faith by it under the  provisions  of this  Agreement  in
reliance upon such certificate.
     (c) The Rights Agent shall be liable hereunder only for its own negligence,
bad faith or willful misconduct.  In no case will the Rights Agent be liable for
special,  indirect,  incidental  or  consequential  loss or  damages of any kind
whatsoever (including but not limited to lost profits), even if the Rights Agent
has been advised of the possibility of such damages.
     (d) The  Rights  Agent  shall not be liable  for or by reason of any of the
statements  of fact or recitals  contained  in this  Agreement  or in the Rights
Certificates  (except  as to the  fact  that  it has  countersigned  the  Rights
Certificates)  or be required to verify the same,  but all such  statements  and
recitals are and shall be deemed to have been made by the Company only.
     (e) The Rights  Agent shall not be under any  responsibility  in respect of
the validity of this Agreement or the execution and delivery  hereof (except the
due  execution  hereof by the Rights  Agent) or in respect  of the  validity  or
execution of any Rights Certificate (except its countersignature  thereof);  nor
shall  it be  responsible  for  any  change  in  the  exercisability  of  Rights
(including  Rights  becoming void  pursuant to Section 7(e) hereof)  except with
respect to the exercise of Rights evidenced by Rights  Certificates after actual
notice of such change; nor shall it be responsible for any breach by the Company
of any  covenant  or  condition  contained  in this  Agreement  or in any Rights
Certificate;  nor shall it be responsible for any adjustment  required under the
provisions of Section 11 or 13 hereof or responsible  for the manner,  method or
amount of any such adjustment or the ascertaining of the existence of facts that
would require any such adjustment (except with respect to the exercise of Rights
evidenced by Rights  Certificates  after  receipt of a  certificate  pursuant to
Section 12 describing any such adjustment);  nor shall it be responsible for any
determination  by the  Board  of the  current  market  value  of the  Rights  or
Preferred Stock or Common Stock pursuant to the provisions of Section 15 hereof;
nor  shall it by any act  hereunder  be  deemed  to make any  representation  or
warranty as to the authorization or reservation of any shares of Preferred Stock
or other  securities  to be issued  pursuant  to this  Agreement  or any  Rights
Certificate or as to whether any shares of Preferred  Stock or other  securities
will,  when so  issued,  be  validly  authorized  and  issued,  fully  paid  and
nonassessable.
     (f) The  Company  agrees that it will  perform,  execute,  acknowledge  and
deliver or cause to be performed, executed,  acknowledged and delivered all such
further and other acts, instruments and assurances as may reasonably be required
by the Rights Agent for the carrying out or  performance  by the Rights Agent of
the provisions of this Agreement.
     (g)  The  Rights  Agent  is  hereby   authorized  and  directed  to  accept
instructions  with  respect  to the  performance  of its  duties  hereunder  and
certificates delivered pursuant to any provision hereof from the Chief Executive
Officer,  the President,  any Vice President,  the Chief Financial Officer,  the
Secretary,  any Assistant Secretary, the Treasurer or any Assistant Treasurer of
the  Company,  and is  authorized  to  apply  to such  officers  for  advice  or
instructions in connection  with its duties,  and it shall not be liable for any
action  taken or  suffered  to be taken by it in good faith in  accordance  with
written  instructions  of any such officer.  Any application by the Rights Agent
for  written  instructions  from the  Company  may,  at the option of the Rights
Agent,  set forth in writing  any action  proposed to be taken or omitted by the
Rights Agent with respect to its duties or obligations  under this Agreement and
the date on or after which such action  shall be taken or omitted and the Rights
Agent shall not be liable for any action taken or omitted in  accordance  with a
proposal included in any such application on or after the date specified therein
(which  date shall not be less than three (3)  Business  Days after the date any
such officer actually receives such  application,  unless any such officer shall
have  consented  in  writing  to an  earlier  date)  unless,  prior to taking or
omitting any such action, the Rights Agent has received written  instructions in
response to such application specifying the action to be taken or omitted.
     (h) The Rights Agent and any stockholder,  director, officer or employee of
the Rights Agent may buy, sell or deal in any of the Rights or other  securities
of the Company or become pecuniarily  interested in any transaction in which the
Company  may be  interested,  or  contract  with or lend money to the Company or
otherwise  act as fully and freely as though it were not the Rights  Agent under
this  Agreement.  Nothing  herein shall preclude the Rights Agent from acting in
any other capacity for the Company or for any other legal entity.
     (i) The Rights  Agent may execute and  exercise any of the rights or powers
hereby vested in it or perform any duty hereunder either itself or by or through
its  attorneys  or  agents,  and the Rights  Agent  shall not be  answerable  or
accountable for any act,  omission,  default,  neglect or misconduct of any such
attorneys  or agents or for any loss to the  Company  or to the  holders  of the
Rights resulting from any such act,  omission,  default,  neglect or misconduct,
provided reasonable care was exercised in the selection and continued employment
thereof.
     (j) No provision of this Agreement shall require the Rights Agent to expend
or risk  its own  funds  or  otherwise  incur  any  financial  liability  in the
performance  of any of its duties  hereunder or in the exercise of its rights if
there shall be reasonable  grounds for believing that repayment of such funds or
adequate  indemnification  against  such  risk or  liability  is not  reasonably
assured to it.
     (k) If, with respect to any Rights  Certificate  surrendered  to the Rights
Agent  for  exercise  or  transfer,  the  certificate  attached  to the  form of
assignment  or form of election to purchase,  as the case may be, has either not
been  completed or indicates an  affirmative  response to clause l or 2 thereof,
the  Rights  Agent  shall  not take any  further  action  with  respect  to such
requested exercise or transfer without first consulting with the Company.
     22. Change of Rights Agent.  The Rights Agent or any successor Rights Agent
         ----------------------
may resign and be discharged  from its duties under this  Agreement  upon thirty
(30) days' notice in writing mailed to the Company and to each transfer agent of
the Common Stock and Preferred Stock by registered or certified mail, and to the
holders of the Rights  Certificates by first-class  mail. The Company may remove
the Rights Agent or any successor  Rights Agent upon thirty (30) days' notice in
writing,  mailed to the Rights Agent or successor  Rights Agent, as the case may
be,  and to each  transfer  agent of the  Common  Stock and  Preferred  Stock by
registered or certified  mail, and to the holders of the Rights  Certificates by
first-class  mail.  If the  Rights  Agent  shall  resign or be  removed or shall
otherwise become  incapable of acting,  the Company shall appoint a successor to
the Rights Agent.  If the Company shall fail to make such  appointment  within a
period of thirty (30) days after  giving  notice of such removal or after it has
been notified in writing of such  resignation  or incapacity by the resigning or
incapacitated  Rights Agent or by the holder of a Rights Certificate (who shall,
with such notice,  submit such holder's Rights Certificate for inspection by the
Company),  then the registered holder of any Rights Certificate may apply to any
court of competent  jurisdiction  for the appointment of a new Rights Agent. Any
successor  Rights  Agent,  whether  appointed by the Company or by such a court,
shall be (a) a Person  organized and doing business under the laws of the United
States or of the State of New York or the State of  California  (or of any other
state of the United  States so long as such Person is  authorized to do business
in the State of New York or the State of California), in good standing, having a
principal  office in the State of New York or the State of California,  which is
authorized under such laws to exercise  corporate trust or stockholder  services
powers  and is  subject  to  supervision  or  examination  by  federal  or state
authority  and  which  has at the  time of its  appointment  as  Rights  Agent a
combined capital and surplus of at least $50,000,000.00 or (b) an affiliate of a
Person  described  in  clause  (a) of  this  sentence.  After  appointment,  the
successor Rights Agent shall be vested with the same powers,  rights, duties and
responsibilities  as if it had been  originally  named as Rights  Agent  without
further act or deed; but the predecessor Rights Agent shall deliver and transfer
to the successor Rights Agent any property at the time held by it hereunder, and
execute and deliver any further assurance, conveyance, act or deed necessary for
the  purpose.  Not later than the  effective  date of any such  appointment  the
Company shall mail notice thereof in writing to the predecessor Rights Agent and
each transfer agent of the Common Stock and Preferred  Stock,  and mail a notice
thereof in writing to the registered holders of the Rights Certificates. Failure
to give any notice  provided  for in this  Section  22,  however,  or any defect
therein, shall not affect the legality or validity of the resignation or removal
of the Rights Agent or the  appointment  of the successor  Rights Agent,  as the
case may be.
     23.  Issuance  of  New  Rights  Certificates.  Notwithstanding  any  of the
          ---------------------------------------
provisions of this Agreement or of the Rights to the contrary,  the Company may,
at its option,  issue new Rights Certificates  evidencing Rights in such form as
may be approved by the Board to reflect any adjustment or change in the Purchase
Price per share and the number or kind or class of shares or other securities or
property  purchasable under the Rights  Certificates made in accordance with the
provisions of this  Agreement.  In addition,  in connection with the issuance or
sale of shares of Common Stock following the Distribution  Date and prior to the
redemption or expiration of the Rights,  the Company (a) shall,  with respect to
shares of  Common  Stock so issued or sold  pursuant  to the  exercise  of stock
options or  otherwise  under any  employee  plan or  arrangement,  which plan or
arrangement  is  existing as of the  Distribution  Date,  or upon the  exercise,
conversion or exchange of any other securities issued by the Company on or prior
to the Distribution Date, and (b) may, in any other case, if deemed necessary or
appropriate by the Board, issue Rights Certificates representing the appropriate
number of Rights in connection  with such issuance or sale;  provided,  however,
that (i) no such Rights Certificates shall be issued if, and to the extent that,
the  Company  shall be advised  by counsel  that such  issuance  would  create a
significant  risk of  material  adverse tax  consequences  to the Company or the
Person to whom such Rights Certificates would be issued, and (ii) no such Rights
Certificates shall be issued if, and to the extent that,  appropriate adjustment
shall otherwise have been made in lieu of the issuance thereof.
     24. Redemption, Termination and Exchange.
         ------------------------------------
     (a) (i) The Board may, at its  option,  at any time prior to the earlier of
(x) the  Stock  Acquisition  Date or (y) the  Close  of  Business  on the  Final
Expiration Date, redeem all but not less than all of the then outstanding Rights
at a redemption price of $0.001 per Right, appropriately adjusted to reflect any
stock split,  stock  dividend or similar  transaction  occurring  after the date
hereof (such redemption price being  hereinafter  referred to as the "Redemption
Price"). The Company may, at its option, pay the Redemption Price in any form of
consideration deemed appropriate by the Board.
     (ii) In addition,  and  notwithstanding  the provisions of Section 24(a)(i)
hereof,  the Board may redeem all but not less than all of the then  outstanding
Rights at the Redemption Price on or after the Stock  Acquisition Date but prior
to any Section 13 Event  either (x) in  connection  with any Section 13 Event in
which all holders of Common  Stock are treated  alike and not  involving  (other
than as a holder of Common Stock being  treated like all other such  holders) an
Acquiring  Person or an Affiliate  or  Associate  thereof or any other Person in
which such Acquiring Person or Affiliate or Associate  thereof has any interest,
or any other Person acting directly or indirectly on behalf of or in association
with any such  Acquiring  Person  or  Affiliate  or  Associate  thereof,  or (y)
following the occurrence of a Section 11 Event, and the expiration of any period
during  which  the  holder of Rights  may  exercise  the  rights  under  Section
11(a)(ii) hereof as a result thereof, if and for as long as any Acquiring Person
having  triggered the Section 11 Event at issue is not thereafter the Beneficial
Owner of twenty percent (20%) or more of the outstanding shares of Common Stock,
and at the time of  redemption  there  are no other  Persons  who are  Acquiring
Persons.
     (b) (i) In the  case  of a  redemption  permitted  under  Section  24(a)(i)
hereof,  immediately upon the action of the Board ordering the redemption of the
Rights,  evidence  of which  shall have been  filed  with the  Rights  Agent and
without any further  action and  without any notice,  the right to exercise  the
Rights will  terminate  and the only right  thereafter  of the holders of Rights
shall be to receive the Redemption Price. In the case of a redemption  permitted
only under  Section  24(a)(ii)  hereof,  evidence of which shall have been filed
with the Rights  Agent,  the right to  exercise  the Rights will  terminate  and
represent  only the right to receive  the  Redemption  Price only after ten (10)
Business Days  following the giving of notice of such  redemption to the holders
of such Rights if no Section 11 Event shall have occurred,  and, if a Section 11
Event shall have  occurred,  upon the later of ten (10) Business Days  following
the  giving of such  notice or the  expiration  of any period  during  which the
rights under  Section  11(a)(ii)  hereof may be  exercised as a result  thereof.
Within ten (10) days after the action of the Board ordering any such  redemption
of the Rights,  the Company  shall give notice of such  redemption to the Rights
Agent and the holders of the then  outstanding  Rights by mailing such notice to
the Rights Agent and to all such holders at their last  addresses as they appear
upon the registry books of the Rights Agent or, prior to the Distribution  Date,
on the registry  books of the transfer  agent for the Common  Stock.  Any notice
that is mailed in the manner herein  provided shall be deemed given,  whether or
not the holder  receives the notice.  Each such notice of redemption  will state
the method by which the payment of the Redemption Price will be made.
     (ii) In the case of a redemption  permitted under Section 24(a)(i) or (ii),
the Company may, at its option, discharge all of its obligations with respect to
the Rights by (i) issuing a press release announcing the manner of redemption of
the Rights and (ii) mailing  payment of the  Redemption  Price to the registered
holders of the Rights at their last  addresses  as they  appear on the  registry
books of the Rights Agent or, prior to the  Distribution  Date,  on the registry
books of the  transfer  agent of the Common  Stock,  and upon such  action,  all
outstanding  Rights  Certificates  shall be null and void  without  any  further
action by the Company.
     (c) (i) Subject to the  limitations  of applicable  laws, the Board may, at
its  option  and at any time  after any  Person  becomes  an  Acquiring  Person,
exchange all or part of the then outstanding and exercisable Rights (which shall
not include  Rights that have become void pursuant to the  provisions of Section
7(e) hereof) for (A) shares of Common Stock at an exchange ratio of one share of
Common Stock per Right, appropriately adjusted to reflect any stock split, stock
dividend or similar  transaction  occurring after the date hereof (the "Exchange
Shares"),  or (B) Substitute  Consideration (as that term is defined below). The
Board may determine, in its sole discretion,  whether to deliver Exchange Shares
or Substitute Consideration.  Notwithstanding the foregoing, the Board shall not
be  empowered to effect such  exchange at any time after any Person  (other than
the Company,  any  Subsidiary of the Company,  any employee  benefit plan of the
Company  or any such  Subsidiary,  or any  entity  holding  Common  Stock for or
pursuant  to the  terms of any such  plan),  together  with all  Affiliates  and
Associates of such Person,  becomes the Beneficial  Owner of fifty percent (50%)
or more of the Common Stock then outstanding.
     (ii)  In  the  event  the  Board  shall  determine  to  deliver  Substitute
Consideration in exchange for Rights,  the Company shall (1) determine the value
of the  Exchange  Shares (the  "Exchange  Value"),  and (2) with respect to each
Right to be exchanged, make adequate provision to substitute for Exchange Shares
the following (the  "Substitute  Consideration"):  (v) cash, (w) Common Stock or
common stock equivalents (as that term is defined in Section  11(a)(iii) hereof)
or Preferred  Stock or  equivalent  preferred  stock (as that term is defined in
Section 11(b) hereof),  (x) debt securities of the Company, (y) other assets, or
(z) any  combination  of the foregoing,  having an aggregate  value equal to the
Exchange  Value,  where such  aggregate  value has been  determined by the Board
based  upon the  advice  of a  nationally  recognized  investment  banking  firm
selected by the Board.  For purposes of this Section 24(c), the value of a share
of Common  Stock shall be the current  market price (as  determined  pursuant to
Section  11(d) hereof) per share of Common Stock on the day that is the later of
(x) the  first  occurrence  of a  Section  11 Event or (y) the date on which the
Company's right of redemption  pursuant to Section 24(a)(i) hereof expires;  and
the value of any common stock  equivalent shall be deemed to have the same value
as the Common Stock on such date.
     (iii) Immediately upon the action of the Board ordering the exchange of any
Rights  pursuant to this  Section  24(c),  and  without  any further  action and
without any notice,  the right to exercise  such Rights shall  terminate and the
only right  thereafter  of a holder of such Rights shall be to receive  Exchange
Shares or Substitute  Consideration for each Right exchanged by such holder. The
Company  shall  promptly  give  public  notice of any such  exchange;  provided,
however,  that the  failure to give,  or any defect in,  such  notice  shall not
affect the validity of such exchange.  The Company  promptly shall mail a notice
of any  such  exchange  to all of the  holders  of such  Rights  at  their  last
addresses as they appear upon the registry books of the Rights Agent. Any notice
that is mailed in the manner herein  provided shall be deemed given,  whether or
not the holder receives the notice.  Each such notice of exchange will state the
method by which the exchange of Common Stock (or Substitute  Consideration)  for
Rights will be effected and, in the event of any partial exchange, the number of
Rights which will be exchanged.  Any partial exchange shall be effected pro rata
based on the number of Rights (other than Rights which have become void pursuant
to the provisions of Section 7(e) hereof) held by each holder of Rights.
     (iv) In the event that there shall not be sufficient shares of Common Stock
or Preferred  Stock issued but not  outstanding  or  authorized  but unissued to
permit any exchange of Rights as  contemplated  in accordance  with this Section
24(c),  the Company  shall take all such action as may be necessary to authorize
additional  shares of Common Stock or Preferred Stock for issuance upon exchange
of the Rights.
     (v) The  Company  shall not be  required  to issue  fractions  of shares of
Common Stock or to distribute  certificates which evidence  fractional shares of
Common Stock.  In lieu of such  fractional  shares of Common Stock,  the Company
shall pay to the registered  holders of the Rights  Certificates  with regard to
which such  fractional  shares of Common  Stock would  otherwise  be issuable an
amount in cash equal to the same fraction of the current market value of a whole
share of Common Stock.  For the purposes of this Section  24(c)(v),  the current
market value of a whole share of Common Stock shall be  determined in the manner
set forth in Section 11(d) hereof for the Trading Day  immediately  prior to the
date of exchange pursuant to this Section 24(c).
     25. Notice of Certain Events.
         ------------------------
     (a) In case the Company  shall  propose (i) to pay any dividend  payable in
stock of any  class  to the  holders  of  Preferred  Stock or to make any  other
distribution to the holders of Preferred  Stock (other than a regular  quarterly
cash  dividend  out of earnings or retained  earnings of the  Company),  (ii) to
offer to the holders of Preferred  Stock rights or warrants to subscribe  for or
to purchase any additional  shares of Preferred  Stock or shares of stock of any
class  or  any  other  securities,  rights  or  options,  (iii)  to  effect  any
reclassification  of Preferred  Stock (other than a  reclassification  involving
only the subdivision of outstanding  shares of Preferred Stock),  (iv) to effect
any  consolidation  or  merger  into or  with,  or to  effect  any sale or other
transfer  (or to permit  one or more of its  Subsidiaries  to effect any sale or
other transfer),  in one or more transactions,  of more than fifty percent (50%)
of the assets or earning power of the Company and its  Subsidiaries  (taken as a
whole) to, any other  Person or (v) to effect the  liquidation,  dissolution  or
winding up of the Company,  then,  in each such case,  the Company shall give to
each holder of a Rights  Certificate,  in accordance  with Section 26 hereof,  a
notice of such  proposed  action,  which  shall  specify the record date for the
purposes of such stock dividend, distribution of rights or warrants, or the date
on  which  such   reclassification,   consolidation,   merger,  sale,  transfer,
liquidation,  dissolution  or  winding  up is to  take  place  and  the  date of
participation  therein by the holders of the shares of Preferred  Stock,  if any
such date is to be fixed,  and such notice  shall be so given in the case of any
action covered by
clause (i) or (ii) above at least  twenty (20) days prior to the record date for
determining  holders  of the  shares of  Preferred  Stock for  purposes  of such
action,  and in the case of any such other  action,  at least  twenty  (20) days
prior  to the  date  of the  taking  of  such  proposed  action  or the  date of
participation therein by the holders of the shares of Preferred Stock, whichever
shall be the earlier.
     (b) In case any Triggering  Event shall occur,  then, in any such case, the
Company or the Principal Party, as the case may be, shall as soon as practicable
thereafter  give to each  holder of a Rights  Certificate,  in  accordance  with
Section 26 hereof,  a notice of the occurrence of such Triggering  Event,  which
shall specify the event and the  consequences of the Triggering Event to holders
of Rights under Section 11(a)(ii) or 13(a) hereof, as the case may be.
     (c) The  failure to give notice  required by this  Section 25 or any defect
therein  shall not affect the  legality or  validity of the action  taken by the
Company or the vote upon any such action.
     26. Notices. Notices or demands authorized by this Agreement to be given or
         -------
made by the Rights Agent or by the holder of any Rights Certificate to or on the
Company shall be sufficiently given or made if sent by first-class mail, postage
prepaid,  or sent by nationwide  overnight  delivery,  addressed  (until another
address is filed in writing with the Rights Agent) as follows:
                  VINA Technologies, Inc.
                  βββββ ββββββ βββββ
                  ββββββ, ββ  βββββ
                  Attention:  Corporate Secretary
Subject to the provisions of Section 22, any notice or demand authorized by this
Agreement  to be given or made by the  Company  or by the  holder of any  Rights
Certificate  to or on the Rights  Agent shall be  sufficiently  given or made if
sent by  first-class  mail,  postage  prepaid,  or sent by nationwide  overnight
delivery, addressed (until another address is filed in writing with the Company)
as follows:
                  American Stock Transfer & Trust Company
                  ββββ ββββ ββββββ
                  ββββββββ, ββ  βββββ
                  Attention:  βββββ β. βββββββββ
Notices  or  demands  authorized  by this  Agreement  to be given or made by the
Company or the Rights  Agent to the  holder of any Rights  Certificate  shall be
sufficiently given or made if sent by first-class mail, postage prepaid, or sent
by  nationwide  overnight  delivery,  addressed to such holder at the address of
such holder as shown on the registry books of the Company.
     27.  Supplements and Amendments.  The Company and the Rights Agent may from
          --------------------------
time to time supplement or amend this Agreement  without approval of any holders
of Rights or Rights  Certificates  in order (i) to cure any  ambiguity,  (ii) to
correct or supplement any provision  contained  herein which may be defective or
inconsistent with any other provisions  herein,  (iii) prior to the Distribution
Date,  to change or supplement  any provision  hereunder in any manner which the
Company may deem necessary or desirable or (iv) on or following the Distribution
Date,  to change or supplement  any provision  hereunder in any manner which the
Company may deem necessary or desirable and which shall not adversely affect the
interests  of the  holders  of  Rights  Certificates.  Upon  the  delivery  of a
certificate  from an  appropriate  officer of the Company  which states that the
proposed supplement or amendment is in compliance with the terms of this Section
27, the Rights Agent shall  execute  such  supplement  or  amendment  unless the
Rights  Agent  shall  have  determined  in good faith  that such  supplement  or
amendment  would adversely  affect its interests under this Agreement.  Prior to
the  Distribution  Date,  the interests of the holders of Rights shall be deemed
coincident with the interests of the holders of Common Stock.
     28.  Determination  and  Actions by the  Board.  For all  purposes  of this
          -----------------------------------------
Agreement,  any calculation of the number of shares of Common Stock  outstanding
at any particular  time,  including for purposes of  determining  the particular
percentage of such outstanding shares of Common Stock or any other securities of
which any Person is the Beneficial  Owner,  shall be made in accordance with the
last sentence of Rule  13d-3(d)(1)(i) of the General Rules and Regulations under
the Exchange Act as in effect on the date of this Agreement. Except as otherwise
provided  herein,  the Board shall have the  exclusive  power and  authority  to
administer  this  Agreement  and to exercise all rights and powers  specifically
granted to the Board or to the  Company,  or as may be necessary or advisable in
the administration of this Agreement,  including,  without limitation, the right
and power to (i)  interpret the  provisions of this  Agreement and (ii) make all
determinations  deemed  necessary or advisable  for the  administration  of this
Agreement  (including a  determination  to redeem or not redeem the Rights or to
amend this  Agreement).  All such  actions,  calculations,  interpretations  and
determinations  (including, for purposes of clause (y) below, all omissions with
respect  to the  foregoing)  which are done or made by the Board in good  faith,
shall (x) be final, conclusive and binding on the Company, the Rights Agent, the
holders of the Rights Certificates and all other parties and (y) not subject the
Board to any liability to the holders of the Rights Certificates.
     29.  Successors.  All the covenants and  provisions of this Agreement by or
          ----------
for the benefit of the  Company or the Rights  Agent shall bind and inure to the
benefit of their respective successors and assigns hereunder.
     30.  Benefits  of This  Agreement.  Nothing  in  this  Agreement  shall  be
          ----------------------------
construed to give to any Person other than the Company, the Rights Agent and the
registered  holders of the Rights  Certificates  (and, prior to the Distribution
Date, the Common Stock) any legal or equitable right, remedy or claim under this
Agreement; but this Agreement shall be for the sole and exclusive benefit of the
Company,  the Rights Agent and the registered holders of the Rights Certificates
(and, prior to the Distribution Date, the Common Stock).
     31. Severability.  If any term, provision,  covenant or restriction of this
         ------------
Agreement is held by a court of competent  jurisdiction or other authority to be
invalid,  void  or  unenforceable,  the  remainder  of  the  terms,  provisions,
covenants  and  restrictions  of this  Agreement  shall remain in full force and
effect and shall in no way be affected, impaired or invalidated.
     32. Governing Law. This Agreement,  each Right and each Rights  Certificate
         -------------
issued  hereunder  shall be deemed to be a  contract  made under the laws of the
State of Delaware  and for all  purposes  shall be governed by and  construed in
accordance with the laws of such state applicable to contracts to be made and to
be performed entirely within such state.
     33.  Counterparts.  This  Agreement  may  be  executed  in  any  number  of
          ------------
counterparts and each of such  counterparts  shall for all purposes be deemed to
be an original,  and all such counterparts shall together constitute but one and
the same instrument.
     34. Descriptive  Headings.  Descriptive headings of the several Sections of
         ---------------------
this Agreement are inserted for convenience only and shall not control or affect
the meaning or construction of any of the provisions hereof.
     IN WITNESS  WHEREOF,  the parties  hereto have caused this  Agreement to be
duly executed as of the day and year first above written.
                                          VINA TECHNOLOGIES, INC.
                                          By:  /s/ ββββ βββββββββββ
                                          Title:  Chief Financial Officer
                                          AMERICAN STOCK TRANSFER & TRUST
                                          COMPANY, as Rights Agent
                                          By:  /s/ βββββββ β. ββββββ
                                          Title:  Vice President
                                    EXHIBIT A
                                    ---------
                           CERTIFICATE OF DESIGNATION
                           --------------------------
                   OF SERIES A PARTICIPATING PREFERRED STOCK
                   -----------------------------------------
                                       OF
                                       --
                             VINA TECHNOLOGIES, INC.
                             -----------------------
     We,  ββββββ β. ββββββ,  the  President  and Chief  Executive  Officer,  and
βββββββ β. βββββββββββ, the Secretary, of VINA Technologies, Inc., a corporation
organized  and  existing  under  the  General  Corporation  Law of the  State of
Delaware, DO HEREBY CERTIFY:
     That pursuant to the authority conferred upon the Board of Directors by the
Certificate of Incorporation of the Corporation,  the Board of Directors on July
12,  2001,  adopted the  following  resolution  creating a series of Two Hundred
Thousand  (200,000)  shares of  Preferred  Stock,  par value  $0.0001 per share,
designated as Series A Participating Preferred Stock:
     RESOLVED,  that pursuant to the authority  vested in the Board of Directors
of the  Corporation  in accordance  with the  provisions of its  Certificate  of
Incorporation,  a series of Preferred  Stock of the Corporation be and it hereby
is  created,  and  that the  designation  and  amount  thereof  and the  powers,
preferences  and relative,  participating,  optional and other special rights of
the shares of such series, and the  qualifications,  limitations or restrictions
thereof are as follows:
     1. Designation and Amount. The shares of such series shall be designated as
        ----------------------
"Series A Participating  Preferred  Stock," par value $0.0001 per share, and the
number  of  shares  constituting  such  series  shall  be Two  Hundred  Thousand
(200,000).  Such number of shares may be increased or decreased by resolution of
the Board of Directors;  provided,  that no decrease  shall reduce the number of
shares of Series A  Participating  Preferred Stock to a number less than that of
the shares then  outstanding plus the number of shares issuable upon exercise of
outstanding  rights,  options or  warrants  or upon  conversion  of  outstanding
securities issued by the Corporation.
     2. Dividends and Distributions.
        ---------------------------
     (A) Subject to the prior and  superior  rights of the holders of any shares
of any series of  Preferred  Stock  ranking  prior and superior to the shares of
Series A Participating Preferred Stock with respect to dividends, the holders of
shares of Series A Participating Preferred Stock in preference to the holders of
shares of Common Stock, par value $0.0001 per share (the "Common Stock"), of the
Corporation and any other junior stock,  shall be entitled to receive,  when, as
and if declared by the Board of Directors out of funds legally available for the
purpose,  quarterly  dividends payable in cash on the first day of March,  June,
September and December in each year (each such date being  referred to herein as
a "Quarterly Dividend Payment Date"), commencing on the first Quarterly Dividend
Payment  Date  after the first  issuance  of a share or  fraction  of a share of
Series A  Participating  Preferred  Stock in an amount per share (rounded to the
nearest  cent)  equal to the  greater  of (a)  $25.00  or,  (b)  subject  to the
provision for adjustment  hereinafter  set forth,  1,000 times the aggregate per
share  amount of all cash  dividends,  and 1,000 times the  aggregate  per share
amount (payable in kind) of all non-cash dividends or other  distributions other
than a  dividend  payable  in  shares of Common  Stock or a  subdivision  of the
outstanding shares of Common Stock (by reclassification or otherwise),  declared
on the Common Stock, since the immediately  preceding Quarterly Dividend Payment
Date, or, with respect to the first Quarterly  Dividend  Payment Date, since the
first  issuance of any share or  fraction  of a share of Series A  Participating
Preferred Stock. In the event the Corporation  shall at any time after the close
of  business on July 25, 2001 (the  "Rights  Declaration  Date") (i) declare any
dividend on Common Stock payable in shares of Common Stock,  (ii)  subdivide the
outstanding  Common Stock or (iii) combine the  outstanding  Common Stock into a
smaller number of shares, by  reclassification  or otherwise,  then in each such
case the amount to which holders of shares of Series A  Participating  Preferred
Stock were  entitled  immediately  prior to such event  under  clause (b) of the
preceding  sentence shall be adjusted by  multiplying  such amount by a fraction
the  numerator  of which is the  number of shares  of Common  Stock  outstanding
immediately  after  such  event and the  denominator  of which is the  number of
shares of Common Stock that were outstanding immediately prior to such event.
     (B) The Corporation  shall declare a dividend or distribution on the Series
A Participating  Preferred Stock as provided in paragraph (A) above  immediately
after it declares a dividend or  distribution  on the Common Stock (other than a
dividend  payable in shares of Common  Stock);  provided  that,  in the event no
dividend or distribution shall have been declared on the Common Stock during the
period  between any  Quarterly  Dividend  Payment  Date and the next  subsequent
Quarterly  Dividend Payment Date, a dividend of $25.00 per share on the Series A
Participating  Preferred Stock shall  nevertheless be payable on such subsequent
Quarterly Dividend Payment Date.
     (C) Dividends shall begin to accrue and be cumulative on outstanding shares
of Series A Participating  Preferred Stock from the Quarterly  Dividend  Payment
Date next  preceding the date of issue of such shares of Series A  Participating
Preferred  Stock  unless the date of issue of such shares is prior to the record
date for the first Quarterly  Dividend  Payment Date, in which case dividends on
such  shares  shall begin to accrue  from the date of issue of such  shares,  or
unless the date of issue is a Quarterly Dividend Payment Date or is a date after
the  record  date  for the  determination  of  holders  of  shares  of  Series A
Participating  Preferred  Stock  entitled  to receive a quarterly  dividend  and
before such  Quarterly  Dividend  Payment  Date,  in either of which events such
dividends shall begin to accrue and be cumulative  from such Quarterly  Dividend
Payment Date.  Accrued but unpaid  dividends shall not bear interest.  Dividends
paid on the shares of Series A  Participating  Preferred Stock in an amount less
than the total amount of such  dividends at the time accrued and payable on such
shares  shall be  allocated  pro rata on a  share-by-share  basis among all such
shares at the time outstanding. The Board of Directors may fix a record date for
the determination of holders of shares of Series A Participating Preferred Stock
entitled to receive  payment of a dividend  or  distribution  declared  thereon,
which  record date shall be no more than 30 days prior to the date fixed for the
payment thereof.
     3. Voting Rights. The holders of shares of Series A Participating Preferred
        -------------
Stock shall have the following voting rights:
     (A) Subject to the provision for  adjustment  hereinafter  set forth,  each
share of Series A Participating Preferred Stock shall entitle the holder thereof
to 1,000 votes on all matters  submitted  to a vote of the  stockholders  of the
Corporation.  In the event the  Corporation  shall at any time  after the Rights
Declaration  Date (i) declare any dividend on Common Stock  payable in shares of
Common Stock, (ii) subdivide the outstanding  Common Stock into a greater number
of shares or (iii) combine the outstanding Common Stock into a smaller number of
shares, by reclassification  or otherwise,  then in each such case the number of
votes per share to which holders of shares of Series A  Participating  Preferred
Stock  were  entitled  immediately  prior to such  event  shall be  adjusted  by
multiplying  such number by a fraction  the  numerator of which is the number of
shares  of  Common  Stock  outstanding  immediately  after  such  event  and the
denominator  of which is the  number  of  shares  of  Common  Stock  outstanding
immediately prior to such event.
     (B)  Except  as  otherwise   provided   herein,   in  the   Certificate  of
Incorporation  or by law,  the  holders  of  shares  of  Series A  Participating
Preferred  Stock and the holders of shares of Common Stock and any other capital
stock of the Corporation having general voting rights shall vote together as one
class on all matters submitted to a vote of stockholders of the Corporation.
     (C) (i) If at any time  dividends on any Series A  Participating  Preferred
Stock shall be in arrears in an amount equal to six quarterly dividends thereon,
the holders of the Series A Participating  Preferred Stock, voting as a separate
series from all other  series of Preferred  Stock and classes of capital  stock,
shall be entitled to elect two members of the Board of  Directors in addition to
any Directors  elected by any other series,  class or classes of securities  and
the  authorized  number of  Directors  will  automatically  be increased by two.
Promptly  thereafter,  the Board of Directors of this Corporation shall, as soon
as  may  be  practicable,  call  a  special  meeting  of  holders  of  Series  A
Participating  Preferred  Stock for the purpose of electing  such members of the
Board of  Directors.  Said special  meeting shall in any event be held within 45
days of the occurrence of such arrearage.
     (ii) During any period when the holders of Series A Participating Preferred
Stock,  voting as a separate series,  shall be entitled and shall have exercised
their  right to elect two  Directors,  then and  during  such time as such right
continues (a) the then authorized  number of Directors shall remain increased by
two,  and the holders of Series A  Participating  Preferred  Stock,  voting as a
separate  series,  shall remain  entitled to elect the  additional  Directors so
provided for, and (b) each such additional Director shall not be a member of any
existing class of the Board of Directors,  but shall serve until the next annual
meeting of  stockholders  for the  election  of  Directors,  or until his or her
successor shall be elected and shall qualify,  or until his or her right to hold
such office terminates pursuant to the provisions of this Section 3(C).
     (iii) A Director  elected  pursuant to the terms hereof may be removed with
or  without  cause by the  holders  of Series A  Participating  Preferred  Stock
entitled to vote in an election of such Director.
     (iv) If, during any interval  between annual meetings of  stockholders  for
the  election  of  Directors  and while the  holders  of Series A  Participating
Preferred  Stock shall be entitled to elect two Directors,  there are fewer than
two such Directors in office by reason of resignation,  death or removal,  then,
promptly thereafter,  the Board of Directors shall call a special meeting of the
holders
of Series A  Participating  Preferred  Stock for the  purpose  of  filling  such
vacancy(ies) and such vacancy(ies) shall be filled at such special meeting. Such
special  meeting shall in any event be held within 45 days of the  occurrence of
any such vacancy(ies).
     (v) At  such  time as the  arrearage  is  fully  cured,  and all  dividends
accumulated and unpaid on any shares of Series A  Participating  Preferred Stock
outstanding are paid, and, in addition  thereto,  at least one regular  dividend
has been paid  subsequent  to curing such  arrearage,  the term of office of any
Director elected  pursuant to this Section 3(C), or his or her successor,  shall
automatically   terminate,   and  the  authorized   number  of  Directors  shall
automatically  decrease  by two,  and the rights of the holders of the shares of
the Series A  Participating  Preferred Stock to vote as provided in this Section
3(C) shall  cease,  subject to renewal from time to time upon the same terms and
conditions.
     (D) Except as set forth herein or as otherwise  provided by law, holders of
Series A  Participating  Preferred Stock shall have no special voting rights and
their consent  shall not be required  (except to the extent they are entitled to
vote with holders of Common Stock and any other capital stock of the Corporation
having  general  voting  rights as set forth  herein)  for taking any  corporate
action.
     4. Certain Restrictions.
        --------------------
     (A)  Whenever  quarterly  dividends  or other  dividends  or  distributions
payable on the Series A  Participating  Preferred Stock as provided in Section 2
are in  arrears,  thereafter  and until all  accrued  and unpaid  dividends  and
distributions,  whether  or not  declared,  on shares of Series A  Participating
Preferred Stock  outstanding shall have been paid in full, the Corporation shall
not:
     (i) declare or pay dividends on, make any other distributions on, or redeem
or purchase or otherwise  acquire for  consideration any shares of stock ranking
junior (either as to dividends or upon  liquidation,  dissolution or winding up)
to the Series A Participating Preferred Stock;
     (ii)  declare or pay  dividends on or make any other  distributions  on any
shares of stock ranking on a parity (either as to dividends or upon liquidation,
dissolution  or winding  up) with the  Series A  Participating  Preferred  Stock
except dividends paid ratably on the Series A Participating  Preferred Stock and
all such parity stock on which dividends are payable or in arrears in proportion
to the total amounts to which the holders of all such shares are then entitled;
     (iii) redeem or purchase or otherwise acquire for  consideration  shares of
any stock  ranking on a parity  (either  as to  dividends  or upon  liquidation,
dissolution  or winding  up) with the  Series A  Participating  Preferred  Stock
provided  that the  Corporation  may at any time  redeem,  purchase or otherwise
acquire  shares of any such parity  stock in exchange for shares of any stock of
the  Corporation  ranking  junior  (either as to dividends or upon  dissolution,
liquidation or winding up) to the Series A Participating Preferred Stock; or
     (iv) purchase or otherwise acquire for consideration any shares of Series A
Participating  Preferred  Stock or any shares of stock  ranking on a parity with
the Series A Participating  Preferred Stock except in accordance with a purchase
offer  made  in  writing  or by  publication  (as  determined  by the  Board  of
Directors)  to all  holders  of such  shares  upon  such  terms as the  Board of
Directors, after consideration of the respective annual dividend rates and other
relative  rights and  preferences  of the respective  series and classes,  shall
determine in good faith will result in fair and  equitable  treatment  among the
respective series or classes.
     (B) The  Corporation  shall not permit any subsidiary of the Corporation to
purchase  or  otherwise  acquire  for  consideration  any shares of stock of the
Corporation unless the Corporation could, under paragraph (A) of this Section 4,
purchase or otherwise acquire such shares at such time and in such manner.
     5. Reacquired Shares. Any shares of Series A Participating  Preferred Stock
        -----------------
purchased  or otherwise  acquired by the  Corporation  in any manner  whatsoever
shall be retired and canceled promptly after the acquisition  thereof.  All such
shares shall upon their  cancellation  become  authorized but unissued shares of
Preferred  Stock and may be reissued as part of a new series of Preferred  Stock
to be created by resolution or resolutions of the Board of Directors, subject to
the conditions and restrictions on issuance set forth herein.
     6. Liquidation, Dissolution or Winding Up.
        --------------------------------------
     (A) Upon any liquidation  (voluntary or otherwise),  dissolution or winding
up of the Corporation, no distribution shall be made to the holders of shares of
stock ranking junior (either as to dividends or upon liquidation, dissolution or
winding up) to the Series A Participating Preferred Stock unless, prior thereto,
the  holders  of shares of Series A  Participating  Preferred  Stock  shall have
received per share, the greater of $1,000.00 or 1,000 times the payment made per
share of Common Stock,  plus an amount equal to accrued and unpaid dividends and
distributions thereon, whether or not declared, to the date of such payment (the
"Series A Liquidation Preference").  Following the payment of the full amount of
the Series A Liquidation Preference,  no additional  distributions shall be made
to the holders of shares of Series A Participating Preferred Stock unless, prior
thereto, the holders of shares of Common Stock shall have received an amount per
share (the "Common  Adjustment")  equal to the quotient obtained by dividing (i)
the Series A Liquidation  Preference by (ii) 1,000 (as appropriately adjusted as
set forth in  subparagraph  (C) below to reflect  such  events as stock  splits,
stock  dividends  and  recapitalization  with respect to the Common Stock) (such
number in clause (ii), the  "Adjustment  Number").  Following the payment of the
full amount of the Series A Liquidation  Preference and the Common Adjustment in
respect of all outstanding shares of Series A Participating  Preferred Stock and
Common Stock,  respectively,  holders of Series A Participating  Preferred Stock
and  holders  of  shares  of  Common  Stock  shall  receive  their  ratable  and
proportionate  share of the remaining  assets to be  distributed in the ratio of
the  Adjustment  Number to 1 with  respect  to such  Preferred  Stock and Common
Stock, on a per share basis, respectively.
     (B) In the  event  there  are not  sufficient  assets  available  to permit
payment  in full of the  Series A  Liquidation  Preference  and the  liquidation
preferences  of all other series of  Preferred  Stock,  if any,  which rank on a
parity with the Series A  Participating  Preferred  Stock,  then such  remaining
assets  shall be  distributed  ratably to the holders of such  parity  shares in
proportion to their respective liquidation preferences.  In the event, following
payment in full of all  liquidation  preferences  of all shares senior to Common
Stock  (including the Series A  Participating  Preferred  Stock),  there are not
sufficient assets
available to permit payment in full of the Common Adjustment, then the remaining
assets shall be distributed ratably to the holders of Common Stock.
     (C) In the  event  the  Corporation  shall at any  time  after  the  Rights
Declaration  Date (i) declare any dividend on Common Stock  payable in shares of
Common Stock, (ii) subdivide the outstanding  Common Stock, or (iii) combine the
outstanding Common Stock into a smaller number of shares, by reclassification or
otherwise,  then in each such case the Adjustment  Number in effect  immediately
prior to such event shall be adjusted by multiplying such Adjustment Number by a
fraction  the  numerator  of which is the  number  of  shares  of  Common  Stock
outstanding  immediately  after such event and the  denominator  of which is the
number of shares of Common Stock that were outstanding immediately prior to such
event.
     7. Consolidation, Merger, etc. In case the Corporation shall enter into any
        --------------------------
consolidation,  merger,  combination or other transaction in which the shares of
Common Stock are exchanged for or changed into other stock or  securities,  cash
or  any  other  property,  then  in  any  such  case  the  shares  of  Series  A
Participating  Preferred Stock shall at the same time be similarly  exchanged or
changed  in an  amount  per  share  (subject  to the  provision  for  adjustment
hereinafter  set  forth)  equal to 1,000  times the  aggregate  amount of stock,
securities,  cash or any other property  (payable in kind),  as the case may be,
into which or for which each share of Common Stock is changed or  exchanged.  In
the event the Corporation  shall at any time after the Rights  Declaration  Date
(i) declare any dividend on Common Stock payable in shares of Common Stock, (ii)
subdivide the outstanding  Common Stock, or (iii) combine the outstanding Common
Stock  into a smaller  number of  shares,  then in each such case the amount set
forth in the preceding sentence with respect to the exchange or change of shares
of Series A Participating  Preferred Stock shall be adjusted by multiplying such
amount by a fraction  the  numerator  of which is the number of shares of Common
Stock  outstanding  immediately after such event and the denominator of which is
the number of shares of Common Stock that are outstanding  immediately  prior to
such event.
     8. Redemption.  The shares of Series A Participating  Preferred Stock shall
        ----------
not be redeemable.
     9. Ranking. The Series A Participating Preferred Stock shall rank junior to
        -------
all other  series of the  Corporation's  Preferred  Stock as to the  payment  of
dividends and the  distribution  of assets,  unless the terms of any such series
shall provide otherwise.
     10.  Amendment.  The  Certificate of  Incorporation  and the By-Laws of the
          ---------
Corporation  shall not be further  amended in any manner which would  materially
alter or change  the  powers,  preferences  or  special  rights of the  Series A
Participating  Preferred  Stock  so as to  affect  them  adversely  without  the
affirmative vote of the holders of at least 66-2/3% of the outstanding shares of
Series A Participating Preferred Stock voting separately as a class.
     11. Fractional Shares. Series A Participating Preferred Stock may be issued
         -----------------
in fractions of a share which shall  entitle the holder,  in  proportion to such
holder's  fractional  shares,  to exercise  voting  rights,  receive  dividends,
participate  in  distributions  and to have the  benefit of all other  rights of
holders of Series A Participating Preferred Stock.
     IN WITNESS WHEREOF, we have executed and subscribed this Certificate and do
affirm the  foregoing as true under the  penalties of perjury as of the __th day
of July, 2001.
                                    ----------------------------------
                                    ββββββ β. ββββββ
                                    Chief Executive Officer
                                    Attest:
                                    ----------------------------------
                                    βββββββ β. βββββββββββ
                                    Secretary
                                    EXHIBIT B
                          [Form of Rights Certificate]
                          ----------------------------
Certificate No. R-______________            _____________ Rights
NOT  EXERCISABLE  AFTER July 25,  2011,  OR EARLIER IF NOTICE OF  REDEMPTION  OR
EXCHANGE IS GIVEN.  THE RIGHTS ARE SUBJECT TO  REDEMPTION,  AT THE OPTION OF THE
COMPANY,  AT  $0.001  PER RIGHT  AND TO  EXCHANGE  ON THE TERMS SET FORTH IN THE
RIGHTS AGREEMENT. [THE RIGHTS REPRESENTED BY THIS RIGHTS CERTIFICATE WERE ISSUED
TO A PERSON WHO WAS AN  ACQUIRING  PERSON OR AN  ASSOCIATE OR AN AFFILIATE OF AN
ACQUIRING  PERSON (AS SUCH TERMS ARE  DEFINED  IN THE  RIGHTS  AGREEMENT).  THIS
RIGHTS  CERTIFICATE AND THE RIGHTS  REPRESENTED HEREBY MAY BECOME VOID UNDER THE
CIRCUMSTANCES SPECIFIED IN SECTION 7(e) OF THE RIGHTS AGREEMENT.]*
                               Rights Certificate
                               ------------------
                             VINA TECHNOLOGIES, INC.
                             -----------------------
     This certifies that  ____________________,  or registered  assigns,  is the
registered owner of the number of Rights set forth above, each of which entitles
the owner thereof, subject to the terms, provisions and conditions of the Rights
Agreement  dated as of July 25,  2001  (the  "Rights  Agreement")  between  VINA
TECHNOLOGIES,  INC., a Delaware corporation (the "Company"),  and AMERICAN STOCK
TRANSFER & TRUST  COMPANY,  a New York  corporation  (the  "Rights  Agent"),  to
purchase from the Company at any time after the Distribution  Date (as such term
is defined in the Rights  Agreement) and prior to 5:00 p.m. (San Francisco time)
on July 25,  2011,  unless  earlier  redeemed or exchanged by the Company as set
forth in the Rights Agreement,  at the office of the Rights Agent designated for
such purpose, one one-thousandth of a fully paid,  nonassessable share of Series
A Participating  Preferred Stock (the  "Preferred  Stock") of the Company,  at a
purchase price of Thirty-Five Dollars ($35.00) per one one-thousandth of a share
(the  "Purchase  Price"),   upon  presentation  and  surrender  of  this  Rights
Certificate  with the  appropriate  Form of Election to Purchase and Certificate
duly executed.
     The number of Rights  evidenced by this Rights  Certificate (and the number
of one  one-thousandths of a share which may be purchased upon exercise thereof)
set forth  above,  and the Purchase  Price set forth  above,  are the number and
Purchase  Price as of the close of business  on the record date  relating to the
initial  distribution of the Rights, based on the Preferred Stock as constituted
at such date.
     Upon the  occurrence of a Triggering  Event (as such term is defined in the
Rights  Agreement),  if the Rights  evidenced  by this  Rights  Certificate  are
Beneficially  Owned (as such term is defined in the Rights  Agreement) by (i) an
Acquiring  Person  (as such  term is  defined  in the  Rights  Agreement)  or an
Associate  or  Affiliate  thereof  (as such  terms  are  defined  in the  Rights
Agreement)  or,  (iii)  under  certain  circumstances  specified  in the  Rights
Agreement,  a transferee of an Acquiring Person, or an Affiliate or Associate of
an Acquiring Person, such Rights shall become null and void and no holder hereof
shall have any rights with respect to such Rights from and after the  occurrence
of any such Triggering Event.
     As provided in the Rights  Agreement,  the Purchase Price and the number of
one  one-thousandths of a share of Preferred Stock or other securities which may
be  purchased  upon  the  exercise  of  the  Rights  evidenced  by  this  Rights
Certificate  are subject to  modification  and adjustment  upon the happening of
certain events.
     This  Rights  Certificate  is subject to all of the terms,  provisions  and
conditions of the Rights Agreement,  which terms,  provisions and conditions are
hereby  incorporated  herein by  reference  and made a part  hereof and to which
Rights Agreement  reference is hereby made for a full description of the rights,
limitations  of rights,  obligations,  duties and  immunities  hereunder  of the
Rights Agent, the Company and the holders of the Rights Certificates.  Copies of
the Rights  Agreement are on file at the principal office of the Company and are
also available upon written request to the Company.
     This Rights Certificate,  with or without other Rights  Certificates,  upon
surrender at the office of the Rights Agent designated for such purpose,  may be
exchanged for another Rights  Certificate or Rights  Certificates  of like tenor
and date  evidencing  Rights  entitling the holder to purchase a like  aggregate
number  of one  one-thousandths  of a share of  Preferred  Stock  as the  Rights
evidenced by the Rights  Certificate or Rights  Certificates  surrendered  shall
have  entitled  such holder to  purchase.  If this Rights  Certificate  shall be
exercised (other than pursuant to Section  11(a)(ii) of the Rights Agreement) in
part,  the holder shall be entitled to receive  upon  surrender  hereof  another
Rights  Certificate  or Rights  Certificates  for the number of whole Rights not
exercised.  If this Rights  Certificate  shall be  exercised in whole or in part
pursuant  to Section  11(a)(ii)  of the Rights  Agreement,  the holder  shall be
entitled to receive this Rights  Certificate  duly marked to indicate  that such
exercise has occurred as set forth in the Rights Agreement.
     Subject to the provisions of the Rights Agreement,  the Rights evidenced by
this  Certificate may, in certain  instances,  be (i) redeemed by the Company at
its option at a redemption  price of $0.001 per Right or (ii) exchanged in whole
or in part for shares of the Company's Common Stock or substitute consideration.
Subject to the provisions of the Rights Agreement,  the Company,  at its option,
may elect to mail payment of the redemption  price to the  registered  holder of
the Rights at the time of redemption, in which event this certificate may become
void without any further action by the Company.
     The Company may elect not to issue fractional  shares of Preferred Stock or
other  securities  upon the  exercise  of any Right or Rights  evidenced  hereby
(other than fractions,  in the instance of Preferred  Stock,  which are integral
multiples of one one-thousandth of a share of Preferred Stock, which may, at the
election of the Company, be evidenced by depositary receipts),  in which event a
cash payment will be made, in lieu thereof, as provided in the Rights Agreement.
     No holder of this Rights Certificate, as such, shall be entitled to vote or
receive dividends or be deemed for any purpose the holder of one one-thousandths
of a share of Preferred  Stock or of any other  securities  of the Company which
may at any time be issuable on the exercise hereof, nor shall anything contained
in the Rights Agreement or herein be construed to confer upon the holder hereof,
as such,  any of the rights of a stockholder of the Company or any right to vote
for the election of directors or upon any matter  submitted to  stockholders  at
any meeting thereof,  or to give or withhold consent to any corporate action, or
to receive notice of meetings or other actions affecting stockholders (except as
provided  in the Rights  Agreement),  or to receive  dividends  or  subscription
rights,  or  otherwise,  until  the  Right or Rights  evidenced  by this  Rights
Certificate shall have been exercised as provided in the Rights Agreement.
     This Rights  Certificate  shall not be valid or obligatory  for any purpose
until it shall have been countersigned by the Rights Agent.
     WITNESS the facsimile  signature of the proper  officers of the Company and
its corporate seal.
         Dated:  ____________, 20__.
Attest:                                     VINA TECHNOLOGIES, INC.
                                            By:
                                            Title:
Title:
Countersigned:
AMERICAN STOCK TRANSFER & TRUST COMPANY,
as Rights Agent
By:
                  [Form of Reverse Side of Rights Certificate]
                               FORM OF ASSIGNMENT
                               ------------------
                (To be executed by the registered holder if such
               holder desires to transfer the Rights Certificate.)
     FOR VALUE RECEIVED,  _______________________________  hereby sells, assigns
and transfers unto
                   -------------------------------------------------------------
--------------------------------------------------------------------------------
               (please print name, address and social security or
                    other identifying number of transferee)
------------------------------------------------------------------------------
this Rights  Certificate,  together with all right,  title and interest therein,
and does hereby irrevocably constitute and appoint _______________  Attorney, to
transfer the within Rights Certificate on the books of the within-named Company,
with full power of substitution.
         Dated:  ____________, 20___.
         ----------------------------------
         Signature
         Signature Guaranteed:
     Signatures  must be guaranteed  by an Eligible  Guarantor  Institution,  as
defined in Rule 17Ad-15 under the Securities Exchange Act of 1934.
                                   CERTIFICATE
                                   -----------
     The undersigned hereby certifies by checking the appropriate boxes that:
     (1) the Rights  evidenced  by this Rights  Certificate  [ ] are [ ] are not
being sold,  assigned and  transferred by or on behalf of a Person who is or was
an Acquiring  Person or an Affiliate or Associate of any such  Acquiring  Person
(as such terms are defined in the Rights Agreement); and
     (2) after due inquiry and to the best  knowledge  of the  undersigned,  the
undersigned  [ ] did [ ] did not  acquire  the Rights  evidenced  by this Rights
Certificate  from any  Person who is, was or  subsequently  became an  Acquiring
Person or an Affiliate or Associate of an Acquiring Person.
         Dated:  ____________, 20__.
         ----------------------------------
         Signature
                                     NOTICE
                                     ------
     The signature to the foregoing  Assignment  must  correspond to the name as
written upon the face of this Rights  Certificate in every  particular,  without
alteration or enlargement or any change whatsoever.
     In the event the Certificate set forth above is not completed,  the Company
will  deem  the  beneficial  owner  of  the  Rights  evidenced  by  this  Rights
Certificate to be an Acquiring  Person or an Affiliate or Associate  thereof (as
defined in the Rights  Agreement)  and will affix a legend to that effect on any
Rights Certificate issued in exchange for this Rights Certificate.
                          FORM OF ELECTION TO PURCHASE
                          ----------------------------
                      (To be executed if holder desires to
                   exercise the Rights Certificate pursuant to
                   Section 11(a)(ii) of the Rights Agreement.)
To: VINA TECHNOLOGIES, INC.
     The undersigned  hereby  irrevocably  elects to exercise  __________ Rights
represented  by this Rights  Certificate  to purchase the shares of Common Stock
(or such other  securities  of the  Company)  issuable  upon the exercise of the
Rights and requests that certificates for such shares be issued in the name of:
--------------------------------------------------------------------------------
           (Please insert social security or other identifying number)
--------------------------------------------------------------------------------
                         (Please print name and address)
--------------------------------------------------------------------------------
     The Rights Certificate indicating the balance, if any, of such Rights which
may still be exercised  pursuant to Section  11(a)(ii)  of the Rights  Agreement
shall be returned to the undersigned  unless the  undersigned  requests that the
Rights Certificate be registered in the name of and delivered to:
--------------------------------------------------------------------------------
Please insert social security or other identifying number (complete only if
Rights Certificate is to be registered in a name other than the undersigned)
--------------------------------------------------------------------------------
                         (Please print name and address)
--------------------------------------------------------------------------------
         Dated:  ____________, 20__.
         ----------------------------------
         Signature
Signature Guaranteed:
     Signatures  must be guaranteed  by an Eligible  Guarantor  Institution,  as
defined in Rule 17Ad-15 under the Securities Exchange Act of 1934.
                                   CERTIFICATE
                                   -----------
     The undersigned hereby certifies by checking the appropriate boxes that:
     (1) the Rights  evidenced  by this Rights  Certificate  [ ] are [ ] are not
being exercised by or on behalf of a Person who is or was an Acquiring Person or
an  Affiliate  or  Associate  of any such  Acquiring  Person  (as such terms are
defined pursuant to the Rights Agreement);
     (2) this  Rights  Certificate  [ ] is [ ] is not being sold,  assigned  and
transferred by or on behalf of a Person who is or was an Acquiring  Person or an
Affiliate or Associate of any such  Acquiring  Person (as such terms are defined
in the Rights Agreement); and
     (3) after due inquiry and to the best  knowledge  of the  undersigned,  the
undersigned  [ ] did [ ] did not  acquire  the Rights  evidenced  by this Rights
Certificate  from any  Person who is, was or  subsequently  became an  Acquiring
Person or an Affiliate or Associate of an Acquiring Person.
         Dated:  ____________, 20__.
         ----------------------------------
         Signature
                                     NOTICE
                                     ------
     The signature to the foregoing  Election to Purchase must correspond to the
name as written upon the face of this Rights  Certificate  in every  particular,
without alteration or enlargement or any change whatsoever.
     In the event the Certificate set forth above is not completed,  the Company
will  deem  the  beneficial  owner  of  the  Rights  evidenced  by  this  Rights
Certificate to be an Acquiring  Person or an Affiliate or Associate  thereof (as
defined in the Rights Agreement).
                          FORM OF ELECTION TO PURCHASE
                          ----------------------------
                  (To be executed if holder desires to exercise
                  the Rights Certificate other than pursuant to
                   Section 11(a)(ii) of the Rights Agreement.)
To: VINA TECHNOLOGIES, INC.
     The undersigned  hereby  irrevocably  elects to exercise  __________ Rights
represented by this Rights Certificate to purchase the one  one-thousandths of a
share of Preferred  Stock (or such other  securities of the Company or any other
Person) issuable upon the exercise of the Rights and requests that  certificates
for such shares be issued in the name of:
--------------------------------------------------------------------------------
           (Please insert social security or other identifying number)
--------------------------------------------------------------------------------
                         (Please print name and address)
--------------------------------------------------------------------------------
     If applicable,  the Rights Certificate  indicating the balance,  if any, of
such Rights  which may still be exercised  pursuant to Section  11(a)(ii) of the
Rights  Agreement  shall be  returned  to the  undersigned  unless  such  Person
requests that the Rights  Certificate be registered in the name of and delivered
to:
--------------------------------------------------------------------------------
     Please insert social security or other identifying number (complete only if
Rights Certificate is to be registered in a name other than the undersigned)
--------------------------------------------------------------------------------
                         (Please print name and address)
--------------------------------------------------------------------------------
         Dated:  ____________, 20__.
         ----------------------------------
         Signature
Signature Guaranteed:
     Signatures  must be guaranteed  by an Eligible  Guarantor  Institution,  as
defined in Rule 17Ad-15 under the Securities Exchange Act of 1934.
                                   CERTIFICATE
                                   -----------
     The undersigned hereby certifies by checking the appropriate boxes that:
     (1) the Rights  evidenced  by this Rights  Certificate  [ ] are [ ] are not
being exercised by or on behalf of a Person who is or was an Acquiring Person or
an  Affiliate  or  Associate  of any such  Acquiring  Person  (as such terms are
defined pursuant to the Rights Agreement);
     (2) the Rights  evidenced  by this Rights  Certificate  [ ] are [ ] are not
being sold,  assigned and  transferred by or on behalf of a Person who is or was
an Acquiring  Person or an Affiliate or Associate of any such  Acquiring  Person
(as such terms are defined in the Rights Agreement); and
     (3) after due inquiry and to the best  knowledge  of the  undersigned,  the
undersigned  [ ] did [ ] did not  acquire  the Rights  evidenced  by this Rights
Certificate  from any  Person who is, was or  subsequently  became an  Acquiring
Person or an Affiliate or Associate of an Acquiring Person.
         Dated:  ____________, 20__.
         ----------------------------------
         Signature
                                     NOTICE
                                     ------
     The signature to the foregoing  Election to Purchase must correspond to the
name as written upon the fact of this Rights  Certificate  in every  particular,
without alteration or enlargement or any change whatsoever.
     In the event the Certificate set forth above is not completed,  the Company
will  deem  the  beneficial  owner  of  the  Rights  evidenced  by  this  Rights
Certificate to be an Acquiring  Person or an Affiliate or Associate  thereof (as
defined in the Rights Agreement).
                                    EXHIBIT C
                                    ---------
                                SUMMARY OF RIGHTS
                                -----------------
     On July 12, 2001,  the Board of Directors of VINA  Technologies,  Inc. (the
"Company") declared a dividend  distribution of one "Right" for each outstanding
share of common stock (the  "Common  Stock") of the Company to  stockholders  of
record at the close of business on August 6, 2001 (the "Record Date"). Except as
set forth below, each Right, when exercisable, entitles the registered holder to
purchase  from the  Company  one  one-thousandth  of a share of a new  series of
preferred  stock,  designated  as Series A  Participating  Preferred  Stock (the
"Preferred  Stock"),  at  a  price  of  Thirty-Five  Dollars  ($35.00)  per  one
one-thousandth  of a share (the "Purchase  Price"),  subject to adjustment.  The
description  and terms of the  Rights are set forth in a Rights  Agreement  (the
"Rights  Agreement") between the Company and American Stock Transfer & Trust, as
"Rights Agent."
     Initially,  the Rights will be attached  to all Common  Stock  certificates
representing  shares then outstanding,  and no separate Rights certificates will
be  distributed.   The  Rights  will  separate  from  the  Common  Stock  and  a
"Distribution Date" will occur upon the earliest of the following:  (i) a public
announcement that a person,  entity or group of affiliated or associated persons
or entities  (an  "Acquiring  Person")  has  acquired,  or obtained the right to
acquire, beneficial ownership of twenty percent (20%) or more of the outstanding
shares of Common  Stock (other than (A) as a result of  repurchases  of stock by
the Company or certain  inadvertent  actions by  institutional  or certain other
stockholders,  (B) the Company,  any  subsidiary  of the Company or any employee
benefit plan of the Company or any  subsidiary,  (C) Sierra Ventures V, L.P. and
Sierra Ventures VI, L.P.  (together with their affiliated and associated persons
and entities - "Sierra"),  which currently own in excess of twenty percent (20%)
of the  outstanding  shares of Common Stock, so long as Sierra does not increase
its  beneficial  ownership  by more than five  percent  (5%) of the  outstanding
shares  of Common  Stock  above the  percentage  held on July 25,  2001 (or such
lesser  percentage as may result following any transfer of securities after such
date  until  Sierra  beneficially  owns less than  twenty  percent  (20%) of the
outstanding shares of Common Stock) and (D) certain other instances set forth in
the Rights  Agreement);  or (ii) ten (10)  business  days  (unless  such date is
extended by the Board of Directors) following the commencement of a tender offer
or  exchange  offer  which  would  result  in any  person,  entity  or  group of
affiliated  or  associated  persons or  entities  becoming an  Acquiring  Person
(unless  such tender  offer or  exchange  offer is a  Permitted  Offer  (defined
below)).
     Until the  Distribution  Date (or earlier  redemption  or expiration of the
Rights,  if applicable),  (i) the Rights will be evidenced by  certificates  for
Common Stock and will be transferred  only with such Common Stock  certificates,
(ii) new Common Stock  certificates  issued after the Record Date upon transfers
or new issuances of the Common Stock will contain a notation  incorporating  the
Rights  Agreement  by  reference  and (iii) the  surrender  for  transfer of any
certificates  for outstanding  Common Stock will also constitute the transfer of
the Rights  associated with such Common Stock. As soon as practicable  following
the  Distribution  Date,  separate  certificates  evidencing the Rights ("Rights
Certificates") will be mailed to holders of record of the Common Stock as of the
close of business on the Distribution Date, and the separate Rights Certificates
alone will evidence the Rights.
     The Rights are not exercisable unless and until a Distribution Date occurs.
The Rights will expire on the earliest of (i) July 25, 2011,  (ii)  consummation
of a merger  transaction with a person,  entity or group who (x) acquired Common
Stock  pursuant to a Permitted  Offer and (y) is offering in the merger the same
price per share and form of  consideration  paid in the Permitted Offer or (iii)
redemption or exchange of the Rights by the Company as described below.
     The number of Rights  associated  with each share of Common  Stock shall be
proportionately  adjusted in the event of a stock dividend on, or a subdivision,
combination  or  reclassification  of,  the Common  Stock.  The  Purchase  Price
payable,  and the number of one one-thousandths of a share of Preferred Stock or
other securities or property  issuable,  upon exercise of the Rights are subject
to  adjustment  from time to time (i) in the event of a stock  dividend on, or a
subdivision,  combination or  reclassification of the Preferred Stock, (ii) upon
the grant to  holders  of the  Preferred  Stock of  certain  rights,  options or
warrants to subscribe for Preferred  Stock,  certain  convertible  securities or
securities having the same or more favorable rights,  privileges and preferences
as the  Preferred  Stock at less than the current  market price of the Preferred
Stock or (iii)  upon the  distribution  to  holders  of the  Preferred  Stock of
evidences of indebtedness or assets (excluding  regular quarterly cash dividends
out of earnings or retained  earnings)  or of  subscription  rights,  options or
warrants  (other than those  referred to above).  With  certain  exceptions,  no
adjustments in the Purchase Price will be required until cumulative  adjustments
require an adjustment of at least one percent (1%) in such Purchase Price.
     In the  event  that,  after the first  date of public  announcement  by the
Company or an  Acquiring  Person that an Acquiring  Person has become such,  the
Company  is  involved  in a merger  or other  business  combination  transaction
(whether or not the Company is the surviving corporation) or fifty percent (50%)
or more of the Company's assets or earning power are sold (in one transaction or
a series of transactions), proper provision shall be made so that each holder of
a Right  (other than an Acquiring  Person)  shall  thereafter  have the right to
receive,  upon the exercise  thereof at the then current  Purchase  Price,  that
number of shares of common stock of either the Company,  in the event that it is
the surviving corporation of a merger or consolidation, or the acquiring company
(or,  in the  event  there is more than one  acquiring  company,  the  acquiring
company   receiving  the  greatest  portion  of  the  assets  or  earning  power
transferred)  which at the time of such transaction would have a market value of
two (2) times the Purchase  Price (such right being called the "Merger  Right").
In the event that a person,  entity or group becomes an Acquiring Person (unless
pursuant  to a tender  offer or  exchange  offer for all  outstanding  shares of
Common Stock at a price and on terms  determined  prior to the date of the first
acceptance  of  payment  for any of such  shares by at least a  majority  of the
members of the Board of  Directors  who are not  officers of the Company and are
not Acquiring Persons (or affiliated or associated  persons or entities thereof)
to be fair to, and in the best interests of, the Company and its stockholders (a
"Permitted Offer")),  then proper provision shall be made so that each holder of
a Right will,  for a sixty (60) day period  (subject to extension  under certain
circumstances)  thereafter,  have the right to receive upon exercise that number
of shares of Common Stock (or, at the election of the  Company,  which  election
may be  obligatory  if  sufficient  authorized  shares of  Common  Stock are not
available,  a combination of Common Stock,  property,  other  securities  (e.g.,
Preferred  Stock)  or cash  (including  by way of a  reduction  in the  Purchase
Price))  having a market value of two (2) times the  Purchase  Price (such right
being called the "Subscription  Right").  The holder of a Right will continue to
have the Merger  Right  whether or not such holder  exercises  the  Subscription
Right.  Notwithstanding the foregoing,  upon the occurrence of any of the events
giving rise to the exercisability of the Merger Right or the Subscription Right,
any Rights that are or were at any time after the Distribution  Date owned by an
Acquiring Person (or affiliated or associated persons or entities thereof) shall
immediately become null and void.
     At any time prior to the earlier to occur of (i) a person,  entity or group
becoming an Acquiring  Person or (ii) the expiration of the Rights,  the Company
may redeem the Rights in whole,  but not in part, at a price of $0.001 per Right
(the "Redemption Price"), which redemption shall be effective upon the action of
the Board of  Directors.  Additionally,  the  Company  may,  following a person,
entity or group becoming an Acquiring Person, redeem the then outstanding Rights
in whole,  but not in part, at the  Redemption  Price (i) if such  redemption is
incidental to a merger or other  business  combination  transaction or series of
transactions  involving  the Company but not  involving an Acquiring  Person (or
certain  related persons or entities) or (ii) following an event giving rise to,
and the expiration of the exercise period for, the Subscription Right if and for
as long as the Acquiring Person triggering the Subscription  Right  beneficially
owns securities  representing  less than twenty percent (20%) of the outstanding
shares  of  Common  Stock  and at the  time of  redemption  there  are no  other
Acquiring Persons.  The redemption of Rights described in the preceding sentence
shall be  effective  only as of such  time  when the  Subscription  Right is not
exercisable.  Upon the effective date of the redemption of the Rights, the right
to  exercise  the Rights  will  terminate  and the only right of the  holders of
Rights will be to receive the Redemption Price.
     Subject to applicable  law, the Board of Directors,  at its option,  may at
any time after a person,  group or entity  becomes an Acquiring  Person (but not
after the acquisition by such Acquiring Person of fifty percent (50%) or more of
the  outstanding  shares  of  Common  Stock),  exchange  all or part of the then
outstanding  and  exercisable  Rights (except for Rights which have become void)
for  shares  of Common  Stock at a rate of one  share of Common  Stock per Right
(subject  to  adjustment)  or,  alternatively,   for  substitute   consideration
consisting  of  cash,  securities  of  the  Company  or  other  assets  (or  any
combination thereof).
     The  Preferred  Stock  purchasable  upon  exercise  of the  Rights  will be
nonredeemable  and junior to any other series of preferred stock the Company may
issue  (unless  otherwise  provided in the terms of such  stock).  Each share of
Preferred Stock will have a preferential  quarterly  dividend in an amount equal
to 1,000 times the dividend  declared on each share of Common  Stock,  but in no
event less than $25.00.  In the event of  liquidation,  the holders of shares of
Preferred Stock will receive a preferred  liquidation  payment equal, per share,
to the greater of  $1,000.00 or 1,000 times the payment made per share of Common
Stock. Each share of Preferred Stock will have 1,000 votes, voting together with
the shares of Common Stock. In the event of any merger,  consolidation  or other
transaction  in which  shares  of  Common  Stock are  exchanged,  each  share of
Preferred  Stock will be entitled to receive  1,000 times the amount and type of
consideration  received per share of Common  Stock.  The rights of the Preferred
Stock as to dividends,  liquidation and voting,  and in the event of mergers and
consolidations,  are protected by customary antidilution provisions.  Fractional
shares of Preferred  Stock will be issuable;  however,  the Company may elect to
(i) distribute  depositary  receipts in lieu of such fractional  shares and (ii)
make an adjustment in cash,  in lieu of fractional  shares other than  fractions
that are multiples of one  one-thousandth of a share,  based on the market price
of the Preferred Stock prior to the date of exercise.
     Until a Right is  exercised,  the  holder  thereof,  as such,  will have no
rights as a stockholder of the Company, including, without limitation, the right
to vote or to receive dividends. While the distribution of the Rights should not
be taxable to stockholders or to the Company,  holders of Rights may,  depending
upon the  circumstances,  recognize  taxable  income  in the  event (i) that the
Rights  become  exercisable  for (x) Common Stock or  Preferred  Stock (or other
consideration)  or (y) common stock of an  acquiring  company in the instance of
the Merger Right as set forth above or (ii) of any redemption or exchange of the
Rights as set forth above.
     The Company and the Rights Agent retain broad authority to amend the Rights
Agreement;  however,  following  any  Distribution  Date any  amendment  may not
adversely affect the interests of holders of Rights.
     A copy of the  Rights  Agreement  has been filed  with the  Securities  and
Exchange  Commission  as an Exhibit to a  Registration  Statement on Form 8-A. A
copy of the Rights Agreement is available free of charge from the Company.  THIS
SUMMARY  DESCRIPTION  OF THE  RIGHTS  DOES NOT  PURPORT  TO BE  COMPLETE  AND IS
QUALIFIED  IN ITS  ENTIRETY  BY  REFERENCE  TO THE  RIGHTS  AGREEMENT,  WHICH IS
INCORPORATED HEREIN BY REFERENCE.
--------
* The portion of the legend in brackets shall be inserted only if applicable.