4. Troubleshooting
1000-A2-GN22-00
4-14
February 2003
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.
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.
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.
Summary of Contents for Jetstream CPX-1000
Page 14: ...Preface 1000 A2 GN22 00 x February 2003...
Page 24: ...1 Voice over Broadband Networking 1000 A2 GN22 00 1 10 February 2003...
Page 64: ...2 CPX 1000 Voice Services Platform Description 1000 A2 GN22 00 2 40 February 2003...
Page 100: ...3 Installing the CPX 1000 1000 A2 GN22 00 3 36 February 2003...
Page 128: ...5 Repair Procedures 1000 A2 GN22 00 5 14 February 2003...
Page 156: ...D Specifications 1000 A2 GN22 00 D 8 February 2003...
