
Maintenance Objects
1762
Issue 5 October 2002
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
V2 - Integrated CSU Module Installation and Operation.
The UDS1-BD and 120A1 CSU Module support on-demand loopback 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
Loopback Jack, or between the Integrated CSU and remote CSU. These
loopback tests are explained in detail later in this UDS1-BD MO, but
Figure 56
gives a high level overview of the loopback points.
Figure 56.
High Level Overview Of Loopback Points
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
Remote end loop backs (* CSU or External CSU)
NETWORK
SMRT
JACK
CSU*
MOD
CSU
MOD
CLJ-LB
LLB
RLB
ELB
PLB
CPE
LPBK
JACK
DS1
BOARD
Local end loop backs