Avaya DEFINITY Server CSI Maintenance Manual page 1762

Maintenance Objects
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
gives a high level overview of the loopback points.
DS1
BRD
DS1
BOARD
PLB
BLB
NETWORK
SMRT
JACK
Figure 56. High Level Overview Of Loopback Points
1762
Issue 5 October 2002
NETWORK ENVIRONMENT
CPE NET
CSU
LPBK SMRT
MOD
JACK JACK
Local end
CSU module to CSU module
CSU
MOD
ELB LLB RLB
Local end loop backs
CPE
LPBK
JACK
Remote end loop backs (* CSU or External CSU)
NET CPE
NET-
SMRT LPBK
WORK
JACK JACK
Remote end
CPE
LPBK
JACK
CLJ-LB
CSU*
MOD
R-LLB
Figure 56
CSU DS1
MOD BRD
NETWORK
SMRT
JACK
DS1
BOARD