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Replacing an M120 PIC Cable

 

Removing and installing PIC cables does not affect router function, except that a PIC does not receive or transmit data while its cable is disconnected. To replace a PIC cable, perform the following procedures:

Removing an M120 PIC Cable

To remove a PIC cable:

  1. If the PIC connects to fiber-optic cable, have ready a rubber safety cap for each cable and transceiver.
  2. If removing all cables connected to the PIC, use one of the following methods to take the PIC offline:

    • Press its online/offline button. For a PIC installed in an FPC1, use a tool—such as a flat-blade screwdriver—to press the button slightly beneath the faceplate of the PIC. For a PIC installed in an FPC2 or FPC3, use a narrow-ended tool that fits inside the opening that leads to the button. Press and hold the button until the PIC LED goes out (about 5 seconds).

    • Issue the CLI command:

      user@host> request chassis pic fpc-slot fpc-slot pic-slot pic-slot offline

      For more information about the command, see the CLI Explorer.

  3. Unplug the cable from the cable connector port. If the PIC uses fiber-optic cable, immediately cover each transceiver and the end of each cable with a rubber safety cap.Warning

    Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cable connected to a transceiver emit laser light that can damage your eyes.

    Caution

    Do not leave a fiber-optic transceiver uncovered except when inserting or removing cable. The safety cap keeps the port clean and prevents accidental exposure to laser light.

  4. Remove the cable from the cable management system and detach it from the destination port.

Installing an M120 PIC Cable

To install a PIC cable (see Figure 1):

  1. Have ready a length of the type of cable used by the PIC. For cable specifications, see the M120 Multiservice Edge Router Interface Module Reference.
  2. If the PIC cable connector port is covered by a rubber safety plug, remove the plug.Warning

    Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cable connected to a transceiver emit laser light that can damage your eyes.

    Caution

    Do not leave a fiber-optic transceiver uncovered except when inserting or removing cable. The safety cap keeps the port clean and prevents accidental exposure to laser light.

  3. Insert the cable connector into the cable connector port on the PIC faceplate.
  4. Arrange the cable in the cable management system to prevent it from dislodging or developing stress points. Secure the cable so that it is not supporting its own weight as it hangs to the floor. Place excess cable out of the way in a neatly coiled loop in the cable management system. Placing fasteners on the loop helps to maintain its shape.Caution

    Avoid bending fiber-optic cable beyond its minimum bend radius. An arc smaller than a few inches in diameter can damage the cable and cause problems that are difficult to diagnose.

    Caution

    Do not let fiber-optic cable hang free from the connector. Do not allow fastened loops of cable to dangle, which stresses the cable at the fastening point.

  5. Insert the other end of the cable into the destination port.
  6. Repeat the previous steps for any additional cables.
  7. If the PIC is offline (its failure indicator LED is lit), use one of the following methods to bring the PIC online:
    • Press the PIC offline/online button until the PIC LED lights green. For a PIC installed in an FPC1, use a tool—such as a flat-blade screwdriver—to press the button slightly beneath the faceplate of the PIC. For a PIC installed in an FPC2 or FPC3, use a narrow-ended tool that fits inside the opening that leads to the button.

    • Issue the following CLI command:

      user@host>request chassis pic fpc-slot fpc-slot pic-slot pic-slot online

      For more information about the command, see the CLI Explorer.

    The normal functioning indicator LED confirms that the PIC is online. You can also verify correct PIC functioning by issuing the show chassis fpc pic-status command described in Maintaining M120 PICs and PIC Cables.

Figure 1: Connecting Fiber-Optic Cable to an M120 PIC
Connecting Fiber-Optic
Cable to an M120 PIC