Replace an FBH Cable

This task can take approximately 45 minutes to complete.

1. Follow safety and ESD precautions.

   See Safety and ESD Precautions.

2. Power down the FMM.
3. At the rear of the modular system:
   1. Remove the node rear support bracket from slot 20.

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      Note -  Notice the orientation. The shelf is on top.

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   2. Remove the ties holding down the FBH cables to the tray.
4. Disconnect the faulty cable from the FMM, and pull the connector end out of the modular system.
5. Connect the new FBH cable to the FMM, and tie all four FBH cables to the FBH tray.
6. If the FBH cable goes to slots 3-10 or slots 28-34:
   1. Remove the first eight FBS covers, up or down the modular system.

      See Replace an FBS PCB for FBS cover removal instructions.

   2. Remove the faulty cable.
   3. Start laying in the replacement cable.
   4. Reinstall the first five or six FBS covers.
7. Remove other nearby FBS covers as needed, laying in the replacement cable as you work up or down, reinstalling FBS covers as you install the FBH cable.

   See Precautions for Handling Cords and Cables.

8. Disconnect the faulty FBH cable from the FBS PCB, and remove it from the channel.
9. Connect the new cable to the FBS PCB.
10. Repeat Step 8 and Step 9 iteratively until you have completed the process for each FBH connection.

    Repeat these steps six times for an FBH above the FMM, and seven times for an FBH below the FMM.

    When done, you will have completely removed the faulty cable.

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    Note -  If you replaced the cables for an FBH above the FMM, then an extra unused cable remains in the bundle. Also, an extra RJ-45 connector remains in the plastic wrapping.

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11. Install the node rear support bracket at slot 20.

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    Note -  Check the orientation to ensure that the shelf is on top.

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12. Power on the FMM.

    The FMM power cycle is needed for the PCB to get updated with new FBH cables.

Related Information

• Front Components

• Identifying Component Locations and Slot Numbers

• Safety and ESD Precautions