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DS1-BD (DS1 Interface Circuit Pack)
Issue 1 June 2005 979
Combined with a TN767E circuit pack, Avaya’s 120A1 Integrated CSU module becomes an
enhanced CSU. The 120A1 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 120A1 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 120A1 means a 120A1 (or later-suffixed) CSU.
The 120A1 CSU and the TN767E are for use in the United States of America with 1.544-Mbps
DS1 service. For more information about the 120A1 CSU module see DEFINITY®
Communications System Generic 1, Generic 2 and Generic 3 V1 and 2 – Integrated Channel
Service Unit (CSU) Module Installation and Operation, 555-230-193.
A TN767E and a 120A1 integrated CSU support on-demand loop-back tests assisting fault
detection between the:
● TN767E circuit pack and the integrated CSU
● Integrated CSU and an optional customer-premises loop-back jack
● Integrated CSU and a remote CSU.
These loop-back tests are explained in detail later in this DS1-BD section, but
Figure 49: High-Level Overview Of Loop-Back Points
on page 980 gives a high-level overview
of the loop-back points.
The following list of acronym definitions are for Figure 49: High-Level Overview Of Loop-Back
Points on page 980:
● PLB = Payload Loopback
● BLB = Board Loopback
● ELB = Equipment Loopback
● LLB = Line Loopback
● RLB = Repeater Loopback
● CLJ = Loop-Back 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.