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    Checklist for Monitoring the SCG

    Purpose

    You monitor the SONET Clock Generators (SCGs) that provide a clock signal for the SONET/SDH interfaces on the T320, T640, and the T1600 routers. The SCGs select a clock signal from any Flexible PIC Concentrator (FPC). (See Table 1.)

    Action

    Table 1: Checklist for Monitoring the SCG

    Monitor SCG Tasks

    Command or Action

    Monitor the SCG Status
    1. Monitor the SCG Environmental Status

    show chassis environment

    show chassis environment scg

    1. Display the SCG LED States at the Command Line

    show chassis craft-interface

    1. Check the SCG LEDs States on the Faceplate
     
    Determine SCG Mastership
    1. Display the SCG Master from the Craft Interface Output

    show chassis craft-interface

    1. Check the SCG LED States for SCG Mastership on the Faceplate
     
    Display SCG Alarms
    1. Display Current SCG Alarms

    show chassis alarms

    1. Display SCG Error Messages in the System Log File

    show log messages

    1. Display SCG Error Messages in the Chassis Daemon Log File

    show log chassisd

    Verify SCG Failure
    1. Check the SCG Connection
    1. Make sure the SCG is properly seated in the midplane.
    2. Make sure none of the SCG pins are bent.
    3. Check the thumbscrew on the right side of the SCG.
    1. Perform an SCG Swap Test
    1. Take the SCG offline.
    2. Replace the SCG with one that you know works.
    3. Bring the SCG online.
    4. Check the SCG status.
    Get SCG Hardware Information
    1. Display the SCG Hardware Information

    show chassis hardware

    1. Locate the SCG Serial Number ID Label

    Look on the top of the SCG, close to the midplane connector.

    Return the SCG

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

     

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    Published: 2012-08-20