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    Replacing a Cable from an External Clocking Device to a T1600 Router

    1. Removing a Cable to an External Clocking Device
    2. Installing a Cable to an External Clocking Device

    Removing a Cable to an External Clocking Device

    To remove a cable with RJ-48 connectors from an EXTERNAL CLOCK INPUTS port on the SCG:

    1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
    2. Disconnect the cable from the T1 external clocking device.
    3. Disconnect the cable from the EXTERNAL CLOCK INPUTS port on the SCG.

    Installing a Cable to an External Clocking Device

    To connect a cable with RJ-48 connectors to an EXTERNAL CLOCK INPUTS port on the SCG:

    1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
    2. Plug one end of the cable into the appropriate EXTERNAL CLOCK INPUTS port on the SCG.
    3. Plug the other end of the cable into the T1 external clocking device.
    4. Verify that the LINK LED for each port is lit steadily green.
    5. Issue the show chassis synchronization command to check the status of the port.
      user@host> show chassis synchronization
      user@host> show chassis synchronization
      
          Clock Synchronization Status :
            Clock module on SCG 0
              Current state            : master
              Current clock state      : locked to external-a
                Selected for           : 2 hours, 28 minutes, 4 seconds
                Selected since         : 2006-02-17 01:12:58 PST
              Configured sources
                Source      Priority   Deviation    Last deviation   Status
                                       (in ppm)     (in ppm)
                external-a  primary    measuring    -0.10            in-use
                external-b  secondary  -0.10        -0.10            qualified
          Clock Synchronization Status :
            Clock module on SCG 1
              Current state            : backup
              Current clock state      : locked to master SCG
                Selected for           : 19 hours, 49 minutes, 14 seconds
                Selected since         : 2006-02-16 07:51:48 PST
              Configured sources
                Source      Priority   Deviation    Last deviation   Status
                                       (in ppm)     (in ppm)
                external-a  primary    -0.25        -0.25            qualified
                external-b  secondary  -0.25        -0.25            qualified
      
     

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    Published: 2013-08-16