Common use of iDEN SYSTEM TECHNOLOGY Clause in Contracts

iDEN SYSTEM TECHNOLOGY. Motorola's Integrated Dispatch Enhanced Network (iDEN) System is the second generation, fully digital, integrated radio-telephone and dispatch system in the trunked SMR land mobile spectrum and contains the following features: o Dispatch Communications Features - Private Call - Group Call - Automatic Queuing and Callback - Recent User Priority - Accounting Records Collection o Telephone Interconnect Communications Features - Full Duplex - Call Transfer (No Answer Transfer and Busy Transfer) - Call Forwarding (User Defineable Conditions) - Call Restrictions (User Defineable Conditions) - Call Hold - Call Waiting - Three Party Conference Calling - Accounting Records Collection o Increased capacity, up to six times that of analog trunking through digital TDMA transmission and VSELP voice compression technologies. o Handportable Viability [GRAPHIC OMITTED] FIGURE 1-1 MOTOROLA ESMR PRODUCT OFFERING 1.1.1 LINK INTEGRITY The System architecture incorporates several features which are designed to maximize the integrity of the communication link. Considerable emphasis is given to the signaling performance. Measurements are made both by the MS unit and the base equipment. The number and types of measured parameters include up-link and down-link signal levels and down-link signal levels of adjacent cells. Also, a unique feature of the use of digital communication is the use of the signal quality coding to estimate the bit error-rate of the channel. This measurement allows for a characterization of the impact of co-channel and adjacent channel interference, even when signal levels are relatively high. 1.1.2 FEATURES 1.1.2.1 MS SERVICES Several categories of tele-services are available, including basic speech (duplex telephone interconnect and half-duplex dispatch), short message service (i.e., paging like service), facsimile, and modem port. Non-transparent transmission is used with the inherent RF channel error correction. Data rates of 1200, 2400 and 4800 bits per second are provided. This error detection/re-transmission scheme provides for much reduced net error rates but with a non-deterministic throughput rate dependent on the radio channel quality. In addition to provisions for voice communication, the System's mobile units provide a data port interface to connect standard data terminal equipment. A data IWF (Interworking Function) located at the MSC (Mobile Switching Center) allows inter-working with the analog-oriented PSTN (Public Switched Telephone Network). The IWF connects data from the mobile through a modem and converts the modem audio into PCM format for connection to a PSTN digital trunk. The call set-up message from the MS includes a bearer capability information element to indicate which type of data call is being set-up.