AT&T DS1/DMi/ISDN-PRI manual About this Document, Purpose

ABOUT THIS DOCUMENT

PURPOSE

Over the past several years, basic digital signal level 1 (DS1) service has evolved to include new capabilities and thereby support more sophisticated applications. The three prime applications are:

1 . Digital multiplexed interface with bit-oriented signaling (DMI-BOS)

2 . Digital multiplexed interface with message-oriented signaling (DMI-MOS)

3 . Integrated Services Digital Network primary rate interface (ISDN-PRI)

Since these three applications merely build on each proceeding application, and extend basic DS1 service, they are covered in a single document. This document is reissued (as issue 4) to:

1 . Include coverage for the 551V ST network channel-terminating equipment (NCTE) (also called the channel service unit or CSU)

2 . Upgrade System 85 R2V4 administration procedures to include:

●Coverage for issue 7 of the maintenance and administration panel (MAAP) flip charts

●Additions and corrections to the administration procedures

●Clarifications on the use of trunk type 120 (ISDN-dynamic) and other trunk types for providing Call-by-Call (CBC) Service Selection

3 . Add coverage for DEFINITY® Communications System Generic 2 ISDN-PRI

4 . Add coverage for System 75XE DS1/DMI

5 . Add coverage for DEFINITY Communications System Generic 1 ISDN-PRI

This document describes System 75 and System 75XE DS1/DMIs as well as Generic 1 and Generic 2 ISDN-PRI. It introduces and defines the concepts and terminology that are unique to DS1/DMI/ISDN-PRI. Also included are descriptions of DS1/DMI/ISDN-PRI applications (for both private and public networks), engineering procedures and considerations, cabling and connection arrangements, and administration requirements, restrictions, and limitations.

xix