Nortel NT1R20 Description page 3

Revision history
December 1994
July 1995
August 1996
October 1997
June 1999
Standard, release 1.0. This is the initial release of this document. It
supercedes:
— NT8D02 Digital Line Card description (553-3001-162)
— NT8D09 Analog Message Waiting Line Card description
(553-3001-163)
— 500/2500 line cards description and operation (553-2201-183)
— QPC578 Integrated Services Digital Line Card description
(553-2201-193)
This document also contains information on the new NT1R20 Off-premise
Station Analog Line Card.
Standard, release 2.00. This document is reissued to incorporated technical
corrections. Changes are noted by revision bars in the margin.
Standard, release 3.00. This document is reissued to include the NT5D11
Line-side T1 Interface Card. Changes are noted by revision bars in the
margins.
Standard, release 4.00. This document is reissued to include the NT5D60AA
CLASS Modem Card (XCMC).
Standard, release 5.00.
Line cards Description
iii