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UDS1-BD (UDS1 Interface Circuit Pack)
Issue 1 June 2005 2375
The TN464F or later circuit pack combined with an 120A1 CSU module forms an Enhanced
Integrated CSU. The 120A1 CSU module, when combined with the functionality provided by the
TN464F hardware and firmware, and switch software, provides functionality equivalent to an
external stand-alone ESF T1 CSU. The 120A1 CSU module connects to the TN464F circuit
pack on the I/O connector panel on the back of the port carrier. The CSU module thus becomes
an integrated part of the system. Throughout the document, the term 120A1 will mean a 120A1
or higher suffix CSU module.
The Enhanced Integrated CSU is for use in the United States of America with 1.544-Mbps DS1
service. For further details on the 120A1 CSU module refer to 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.
The UDS1-BD and 120A1 CSU module support on-demand loop-back tests that assist in the
detection of faults between the UDS1-BD circuit pack and the CSU module, between the
Integrated CSU and the optional Customer Premises Loop-Back Jack, or between the
Integrated CSU and remote CSU.
These loop-back tests are explained in detail later in this UDS1-BD MO, but Figure 143
gives a
high level overview of the loop-back points.
Figure 143: High Level Overview Of Loopback Points
The following list of acronym definitions are for the Figure 143: High Level Overview Of
Loopback Points:
● PLB = Payload Loopback
CPE
LPBK
JACK
NET
SMRT
JACK
CSU
MOD
NET
SMRT
JACK
CPE
LPBK
JACK
DS1
BRD
CSU
MOD
DS1
BRD
NET-
WORK
CSU module to CSU module
Remote end
NETWORK ENVIRONMENT
Local end
NETWORK
SMRT
JACK
BLB
R-LLB
CPE
LPBK
JACK
DS1
BOARD
NETWORK
SMRT
JACK
CSU*
MOD
CSU
MOD
CLJ-LB LLB
RLB ELB
PLB
CPE
LPBK
JACK
DS1
BOARD
Local end loop backs