Avaya S8700 - Page 2439

UDS1-BD (UDS1 Interface Circuit Pack)
Issue 1 May 2002
8-1717555-233-143
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 8-103 gives a high level overview of the loop-back points.
Figure 8-103. 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