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Testing
Local Loopbacks
7-2
When a local loopback is enabled, the red Loop Bk LED on the front panel of
the local unit lights up and remains lit until the loopback is disabled.
CO
Diagnostic
E1 HDSL
Equipment
Terminal
Figure 7-1. Local Loopback Initiated by the CO Unit
CO
Diagnostic
E1 HDSL
Equipment
Figure 7-2. Local Loopback Initiated by the CP Unit
September 1997
E1 HDSL
7900
7900
Loop Bk
LED lights
E1 HDSL
7900
7900
CP
Diagnostic
Equipment
7900
7900
97-15249-01
CP
Diagnostic
Equipment
7900
7900
Loop Bk
LED lights
97-15518
Terminal
7915-A2-GB20-20
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