Loopbacks - Paradyne Jetstream CPX-1000 Installation And Operation Manual

4. Troubleshooting

Loopbacks

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The CPX supports near-end loopback on T-1 ports as a diagnostic
tool to test connectivity to external devices. During a loopback
procedure, the transmitted signal is returned to the sending device
to verify that there were no transmission errors.
Use these steps to perform a loopback from JetCraft or JetVision:
Lock the card.
Set the port to loopback status.
Temporarily remove any existing T-1 cable from the port and
connect a loopback plug to the port.
Note
To create a loopback plug, use a short length of T-1 cable
with a jack on one end. Connect pins 1 and 4, and pins 2
and 5. Test the connections for continuity.
Observe the results of the loopback test.
When the loopback test is complete, remove the loopback plug and
reconnect the T-1 cable removed in
Set the port to No Loopback.
Unlock the port, returning it to normal operation.
Refer to the JetCraft User's Guide or JetVision User's Guide for further
details.
1000-A2-GN22-00
Step 3.
February 2003