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Core Issue

The alarm light on the Wan Interface Card (WIC) is lit. This indicates a network issue. These are the alarm codes:

  • Red alarm - loss of network signal
  • Blue Alarm - loss of network frame
  • Yellow Alarm - receive from network


The alarm LED usually indicates a problem with the line.

The status of the WIC can be seen in the output of the show service-module [serial 0|1] command:

R13#show service-module s1/0
Module type is T1/fractional
Hardware revision is 0.104, Software revision is 1.07,
Image checksum is 0x8510A6B6, Protocol revision is 0.1
Transmitter is sending remote alarm.
Receiver has loss of signal, loss of frame,

Framing is ESF, Line Code is B8ZS, Current clock source is line,
Fraction has 24 timeslots (64 Kbits/sec each), Net bandwidth is 1536 Kbits/sec.
Last module self-test (done at startup): Passed
Last clearing of alarm counters 5d01h
loss of signal : 1, current duration 5d01h
loss of frame : 1, current duration 5d01h
AIS alarm : 0,
Remote alarm : 0,
Module access errors : 0,
Total Data (last 96 15 minute intervals):
24480 Line Code Violations, 0 Path Code Violations
34077 Slip Secs, 86400 Fr Loss Secs, 86400 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 86400 Unavail Secs
Data in current interval (312 seconds elapsed):
255 Line Code Violations, 0 Path Code Violations
124 Slip Secs, 312 Fr Loss Secs, 312 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 312 Unavail Secs

The WIC can be tested by issuing the test service-module command, as shown in the following example:

R13#test service-module s1/0
SERVICE_MODULE(Serial1/0): Performing service-module self test
5d01h: SERVICE_MODULE(Serial1/0): self test finished: Passed

For additional information on the WIC-1DSU-T1, refer to the Feature Overview section of 1-Port DSU/CSU T1 WIC for the Cisco 1700, Cisco 2600, Cisco 3600, and Cisco 3700 Series Routers.

If the module fails the self test, the problem is a hardware issue.

When a hardware replacement is indicated after troubleshooting, choose from the following options:

  • If you have a hardware support contract directly with Cisco for this part, use the Service Order Submit Tool to request a replacement part directly.
  • For warranty service, contact the Cisco Technical Assistance Center (TAC) directly at 1-800-553-2447,  or online by using the TAC Service Request Tool.
  • If your product is not covered by contract or warranty, contact your Cisco partner or reseller to request a replacement part for the hardware component that is causing the issue.
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