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    Checklist for Monitoring the Redundant SCG

    Purpose

    You monitor and maintain redundant SONET Clock Generators (SCGs) installed in the T320 router and the T640 router to ensure that there is no interruption of function. SCGs provide a clock signal for SONET/SDH, and select a clock signal from any Flexible PIC Concentrator (FPC), or from the external clock inputs.

    Table 1 lists the tasks you perform to monitor redundant SCGs.

    Action

    Table 1: Checklist for Monitoring the Redundant SCG

    Monitor SCG Tasks

    Command or Action

    Display Redundant SCG Hardware Information

    show chassis hardware

    Monitor Redundant SCG Status
    1. Monitor the Redundant SCG Environmental Status

    show chassis environment

    show chassis environment scg

    1. Display the Redundant SCG LED States at the Command Line

    show chassis craft-interface

    1. View the Redundant SCG LEDs

    Remove the rear component cover and look on the SCG faceplate at the back of the T320 router, T640 router, or T1600 router chassis.

    Display Redundant SCG Mastership
    1. Display the SCG Master and Standby from the Craft Interface Output

    show chassis craft-interface

    1. View the SCG LEDs

    Remove the rear component cover and look on the SCG faceplate at the rear of the T320 router, T640 router, or T1600 router chassis.

    Perform a Swap Test on a Redundant SCG
    1. Take the SCG offline.

      request chassis scg offline slot number

    2. Replace the SCG with one that you know works.
    3. Bring the SCG online.

      request chassis scg offline slot number

    4. Verify the SCG status.

      request chassis scg offline slot number

    Return the SCG

    See Return the Failed Component, or follow the procedure in the respective router hardware guide.

     

    Related Documentation

     

    Published: 2012-08-20