Replacing T640 PIC Cables

Removing and installing PIC cables do 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:

1. Removing a T640 PIC Cable
2. Installing a T640 PIC Cable

Removing a T640 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 a Type 1 FPC, 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 a Type 2 FPC or Type 3 FPC, 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 Junos OS System Basics and Services Command Reference .

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 the ends of fiber-optic cables or into the transceivers on the PIC faceplate. Fiber-optic transceivers and cable connected to transceivers 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 a T640 PIC Cable

1. Have ready a length of the type of cable used by the PIC. For cable specifications, see the T640 Core Router PIC Guide .
2. If the PIC cable connector port is covered by a rubber safety plug, remove the plug.

   Warning: Do not look directly into the ends of fiber-optic cables or into the transceivers on the PIC faceplate. Fiber-optic transceivers and cable connected to transceivers 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 a Type 1 FPC, 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 a Type 2 FPC or Type 3 FPC, use a narrow-ended tool that fits inside the opening that leads to the button.
   • Issue the CLI command:
     user@host>request chassis pic fpc-slot fpc-slot pic-slot pic-slot online

     For more information about the command, see the Junos OS System Basics and Services Command Reference .

   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 T640 PICs and PIC Cables.

Figure 1: Connecting Fiber-Optic Cable to a PIC