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DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-1529UDS1-BD (UDS1 Interface Circuit Pack)
10
The TN464F and 120A1 CSU Module support on-demand loopback tests that
assist in the detection of faults between the TN464F 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 section, but Figure
10-92 gives a high level overview of the loopback points.
Figure 10-92. 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