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Testing
7-2
7915-A2-GB20-20
September 1997
Local Loopbacks
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.
Terminal
97-15249-01
CO
CP
E1 HDSL
7900
7900
E1 HDSL
7900
7900
Diagnostic
Equipment
Diagnostic
Equipment
Loop Bk
LED lights
Figure 7-1.
Local Loopback Initiated by the CO Unit
Terminal
97-15518
CO
CP
E1 HDSL
7900
7900
Diagnostic
Equipment
E1 HDSL
7900
7900
Diagnostic
Equipment
Loop Bk
LED lights
Figure 7-2.
Local Loopback Initiated by the CP Unit