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Testing
7-3
7924-A2-GB20-30
October 1997
Remote Loopbacks
H When a remote loopback is enabled, the red Loop Bk LED on the front panel
of the 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.
H A message appears on the remote-end unit reporting that it has been put into
loopback.
H The data flow is indicated by the bold thick arrows in Figures 7-3 and 7-4.
H When the CO initiates a remote loopback, an Alarm Indication Signal (AIS) is
received at the CP end (only if the CP end is G.703-compatible). (AIS is not
received at V.35-compatible CP units.)
Terminal
97-15515-01
CO CP
E1 HDSL
7900
7900
Diagnostic
Equipment
E1 HDSL
7900
7900
Diagnostic
Equipment
Loop Bk
LED lights
AIS
AIS = Alarm Indication Signal
Figure 7-3. Remote Loopback, Initiated at the CO Unit
Terminal
97-15517-01
CO CP
E1 HDSL
7900
7900
E1 HDSL
7900
7900
Diagnostic
Equipment
Diagnostic
Equipment
Loop Bk
LED lights
Figure 7-4. Remote Loopback, Initiated at the CP Unit