Local Loopbacks - Paradyne HotWire 7924 User Manual

Testing

Local Loopbacks

7-2
When a local loopback is enabled, the red Loop Bk LED on the front panel of
the initiating unit lights up and remains lit until the loopback is disabled.
The data flow is indicated by the bold thick arrows in
When the CO initiates a local 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.)
CO
Diagnostic
E1 HDSL
Equipment
Terminal
Figure 7-1. Local Loopback, Initiated at the CO Unit
CO
Diagnostic
E1 HDSL
Equipment
Figure 7-2. Local Loopback, Initiated at the CP Unit
October 1997
E1 HDSL
7900 7900
Loop Bk
LED lights
E1 HDSL
7900
7900
Figures 7-1 and 7-2.
CP
AIS
Diagnostic
Equipment
7900 7900
AIS = Alarm Indication Signal
97-15514-01
CP
Diagnostic
Equipment
7900
7900
Loop Bk
LED lights
97-15518-01
Terminal
7924-A2-GB20-30