Demand test descriptions and error codes - Avaya Support

DS1-BD (DS1 Interface Circuit Pack)
Signaling over the DS1 link must be synchronized between the transmitting and receiving ends
to ensure error-free communication. See SYNC (Port Network Synchronization) for details.
Combined with a TN767E circuit pack, Avaya’s 120A Integrated CSU module becomes an
enhanced CSU. The 120A CSU, combined with new switch software and the functionality
provided by a TN767E’s hardware and firmware, provides functionality equivalent to an external
stand-alone Avaya ESF T1 CSU. The 120A CSU connects to the TN767E circuit pack on the I/
O connector panel on the back of the port carrier, and thus becomes an integrated part of the
system. Throughout this document, the term 120A means a 120A (or later-suffixed) CSU.
The 120A CSU and the TN767E are for use in the United States of America with 1.544-Mbps
DS1 service. For more information about the 120A CSU module see Installing and Operating a
120A Chel Service Unit with Avaya Communication Manager (03-601508).
A TN767E and a 120A integrated CSU support on-demand loopback tests assisting fault
detection between the:
● TN767E circuit pack and the integrated CSU
● Integrated CSU and an optional customer-premises loopback jack
● Integrated CSU and a remote CSU.
These loopback tests are explained in detail later in this DS1-BD section, but
Figure 17: High-Level Overview Of Loopback Points gives a high-level overview of the
loopback points.
The following list of acronym definitions are for Figure 17: High-Level Overview Of Loopback
Points:
● PLB = Payload Loopback
● BLB = Board Loopback
● ELB = Equipment Loopback
● LLB = Line Loopback
● RLB = Repeater Loopback
● CLJ = Loopback Jack Loopback
● R-LLB = Remote Line Loopback
● SMRT = Smart Jack
● LPBK = Loopback
For more information about DS1 interfaces, refer to the DEFINITY® Communications System
Generic 2.2 and Generic 3 V2 DS1/CEPT1/ISDN-PRI Reference, 555-025-107.
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