Paradyne CPX-1000 manual Loopbacks

4. Troubleshooting 1000-A2-GN22-00

Loopbacks	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:
Step 1	Lock the card.
Step 2	Set the port to loopback status.
Step 3	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.
Step 4	Observe the results of the loopback test.
Step 5	When the loopback test is complete, remove the loopback plug and
	reconnect the T-1 cable removed in Step 3.
Step 6	Set the port to No Loopback.
Step 7	Unlock the port, returning it to normal operation.
	Refer to the JetCraft User’s Guide or JetVision User’s Guide for further
	details.

4-14 February 2003