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Remote Loopback Test
7900-A2-GB20-00
When a remote loopback is enabled, the red Loop Bk LED on the front panel of
remote-end unit (CO or CP) lights up and remains lit until the loopback is
disabled. The loopback LED on the initiating unit does not light. A message
appears on the remote end unit reporting that it has been put into loopback.
CO
Diagnostic
E1 HDSL
Equipment
Terminal
Figure 9-3. Remote Loopback, Initiated at the CO Unit
CO
Diagnostic
Equipment
Nest
Figure 9-4. Remote Loopback, Initiated at the CP Unit
March 1998
E1 HDSL
7900
7900
Loop Bk
LED lights
E1 HDSL
Loop Bk
LED Lights
CP
AIS
Diagnostic
Equipment
7900
7900
AIS = Alarm Indication Signal
97-15515
CP
Diagnostic
Equipment
7900
7900
VT100 Terminal
97-15629
or Emulator
Testing
9-5
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