Information Technology Reference
In-Depth Information
If the Line Is in Loopback Mode
Check to see whether the line is in loopback mode from the show controller e1 output. A line should be
in loopback mode only for testing purposes.
To turn off loopback, use the no loopback command in the controller configuration mode, as shown
here:
maui-nas-03(config-controlle)# no loopback
If the Controller Displays Any Alarms
Check the show controller command output to see whether any alarms are displayed by the controller.
We will now discuss various alarms and the procedure necessary to correct them.
Receiver (Rx) Has Remote Alarm
A received remote alarm means that an alarm is occurring on the line upstream of the equipment
connected to the port.
Check to see whether the framing format configured on the port matches the framing format of the line.
If not, change the framing format on the controller to match that of the line.
Step 1
Check the linecoding setting on the remote-end equipment. Contact your service provider for the correct
settings. Correct any misconfigurations, as necessary.
Step 2
Insert an external loopback cable into the port. To create a loopback plug, refer to the section
“Performing Hardware Loopback Plug Test,” earlier in the chapter.
Step 3
Check to see whether there are any alarms. If you do not see any alarms, then the local hardware is
probably in good condition. In that case, do the following:
Step 4
Check the cabling. Refer to the section “Loss of Signal” for more information.
Check the settings at the remote end, and verify that they match your port settings.
If the problem persists, contact your service provider.
Remove the loopback plug and reconnect your E1 line.
Step 5
Check the cabling. Refer to the section “Loss of Signal” for more information.
Step 6
Power-cycle the router.
Step 7
Connect the E1 line to a different port. Configure the port with the same settings as that of the line. If
the problem does not persist, then the fault lies with the port:
Reconnect the E1 line to the original port.
Proceed to the “Troubleshooting E1 Error Events” section.
If the problem persists, then do the following:
Step 8
Perform a hardware loop test, as described in the section “Performing a Hardware Loop Test,”
Replace the E1 controller card.
Proceed to the “Troubleshooting E1 Error Events” section.
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