Testing
7-2
7914-A2-GB20-00
February 1998
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