Paradyne 7924 manual Local Loopbacks, Local Loopback, Initiated at the CO Unit

Testing

Local Loopbacks

HWhen 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.

HThe data flow is indicated by the bold thick arrows in Figures 7-1and 7-2.

HWhen 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 CP AIS

Diagnostic

Equipment

Loop Bk

LED lights

Diagnostic Equipment

AIS = Alarm Indication Signal

Terminal 97-15514-01

Figure 7-1. Local Loopback, Initiated at the CO Unit

CO	CP
Diagnostic	Diagnostic
Equipment	Equipment
	Loop Bk
	LED lights

Terminal97-15518-01

Figure 7-2. Local Loopback, Initiated at the CP Unit

7-2 October 1997 7924-A2-GB20-30