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Troubleshooting the T320 SONET Clock Generators

 

Problem:

Description:

During normal operations:

  • The green OK LED on the SCG faceplate is lit.

  • The yellow FAIL LED on the SCG faceplate is not lit.

  • The blue MASTER LED on the SCG faceplate indicates which SCG is the master.

The following alarms and LEDs indicate a problem with an SCG:

  • The yellow FAIL LED on the SCG faceplate is lit.

  • The green OK LED on the SCG faceplate is not lit.

  • A red alarm indicates that an SCG, SCG voltage sensor, or the internal clock has failed.

  • A red alarm indicates that there are no SCGs online.

  • A yellow alarm indicates that an SCG is not online in a router with redundant SCGs or that an SCG has been removed..

  • A yellow alarm indicates that a temperature sensor has failed.

Solution

To troubleshoot the T320 SCGs:

  1. Check the LEDs on the faceplate of each SCG and on the craft interface.
  2. Use the CLI to check for alarms—Issue the show chassis alarms command to view the alarms..

In Table 1, the text in the column labeled ”LCD Message” appears in the display of the craft interface. The text in the column labeled “CLI Message” appears in the output from the show chassis alarms command.

Table 1: T320 SCG Alarm Messages

Alarm Type

LCD Display Message

CLI Message

Red

RED ALARMSCG SCG-number Failure

RED ALARMSCG SCG-number Failure

RED ALARMNo SCG Online

RED ALARMNo SCG Online

RED ALARMSCG SCG-numberVolt Snsr Fail

RED ALARMSCG SCG-numberVolt Sensor Fail

RED ALARMSCG SCG-numberINT CLK Fail

RED ALARMSCG SCG-numberInternal Clock Failure

Yellow

YELLOW ALARMSCG SCG-number Not Online

YELLOW ALARMSCG SCG-number Not Online

YELLOW ALARMSCG SCG-number Removed

YELLOW ALARMSCG SCG-number Removed

YELLOW ALARMSCG SCG-numberTmpSnsr Fail

YELLOW ALARMSCG SCG-numberTemp Sensor Fail