Exhibit 4.01 THIRD SUPPLEMENTAL INDENTURE, dated as of February 20, 2001 (the "Third Supplemental Indenture"), to the Indenture, dated as of April 15, 1996 (the "Indenture") between ADELPHIA BUSINESS SOLUTIONS, INC. (formerly known as Hyperion...Third Supplemental Indenture • February 22nd, 2001 • Adelphia Business Solutions Inc • Telephone communications (no radiotelephone)
TOThird Supplemental Indenture • March 31st, 1998 • Central Louisiana Electric Co Inc • Electric services