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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.
2.
3.
Digital multiplexed interface with bit-oriented signaling (DMI-BOS)
Digital multiplexed interface with message-oriented signaling (DMI-MOS)
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.
2.
Include coverage for the 551V ST network channel-terminating equipment (NCTE) (also called
the channel service unit or CSU)
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
Add coverage for DEFINITY
®
Communications System Generic 2 ISDN-PRI
3.
4.
5.
Add coverage for System 75XE DS1/DMI
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.
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