Information Technology Reference
In-Depth Information
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Check the settings at the remote end, and verify that they match your port settings.
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If the problem persists, contact your service provider.
Step 3
Remove the loopback plug, and reconnect your T1 line
Step 4
Check the cabling. Refer to the section “Loss of Signal” for more information.
Step 5
Power-cycle the router.
Step 6
Connect the T1 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 one port:
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Reconnect the T1 line to the original port.
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Proceed to the “Troubleshooting Error Events” section, later in this chapter.
If the problem persists, then do the following:
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Perform a hardware loop test, as described in the section “Performing Hardware Loopback Plug
Test.”
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Replace the T1 controller card.
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Proceed to “Troubleshooting Error Events,” the next section.
Transmitter Sending Remote Alarm (Red)
A red alarm is declared when the CSU cannot synchronize with the framing pattern on the T1 line.
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 settings at the remote end, and verify that they match your port settings.
Step 2
Contact your service provider.
Step 3
Transmit (Tx) Remote Alarm Indication (Yellow)
A transmitted remote alarm indication at the interface indicates that the interface has a problem with the
signal it is receiving from the far-end equipment.
Step 1
Check the settings at the remote end, and verify that they match your port settings.
Step 2
A Tx RAI should be accompanied by some other alarm that indicates the nature of the problem that the
T1 port/card is having with the signal from the far-end equipment.
Troubleshoot that condition to resolve the Tx RAI.
Transmit (Tx) AIS (Blue)
Check to see whether the framing format configured on the port matches the framing format of the line.
If not, correct the mismatch.
Step 1
Power-cycle the router.
Step 2
Connect the T1 line to a different port. Configure the port with the same settings as that of the line.
If the problem persists, then do the following:
Step 3
Perform a hardware loop test, as described in the section “Performing a Hardware Loop Test.”
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