Replacing a T640 FPC

The FPCs are hot-insertable and hot-removable. When you remove an FPC, the router continues to function, although the PIC interfaces installed on the FPC being removed no longer function.

The router holds up to eight FPCs, which are installed vertically in the front of the router. An empty FPC weighs approximately 25 lb (11.3 kg) and a fully configured FPC can weigh up to 32 lb (14.5 kg).

1. Removing a T640 FPC
2. Installing a T640 FPC

Removing a T640 FPC

To remove an FPC (see Figure 1):

1. Have ready a replacement FPC or FPC blank panel and an antistatic mat for the FPC. Also have ready rubber safety caps for each PIC using an optical interface on the FPC that you are removing.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
3. Label the cables connected to each PIC on the FPC so that you can later reconnect the cables to the correct PICs.
4. Use one of the following methods to take the FPC offline:
   • Press and hold the FPC online/offline button. The green OK LED next to the button begins to blink. Hold the button down until the LED goes out. The LEDs and online/offline button for each FPC are located directly above it on the craft interface.
   • Issue the CLI command:
     user@host>request chassis fpc slot slot-number offline

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

5. Disconnect the cables from the PICs installed in the FPC. Immediately cover each fiber-optic transceiver and the end of each cable with a rubber safety cap. Arrange the disconnected cables in the cable management system, to prevent the cables from developing stress points.

   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.

   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.

6. If you are removing a Type 2 FPC or Type 3 FPC, loosen the screws inside the ejector handles at the top and bottom of the FPC faceplate.
7. Simultaneously turn both the ejector handles counterclockwise to unseat the FPC.
8. Grasp the handles, and slide the FPC straight out of the card cage halfway.
9. Place one hand around the front of the FPC (the PIC housing) and the other hand under it to support it. Slide the FPC completely out of the chassis, and place it on the antistatic mat or in the electrostatic bag.

   Caution: The weight of the FPC is concentrated in the back end. Be prepared to accept the full weight—up to 32 lb (14.5 kg)—as you slide the FPC out of the chassis. When the FPC is out of the chassis, do not hold it by the ejector handles or edge connectors. They cannot support its weight. Do not stack FPCs on top of one another after removal. Place each one individually in an electrostatic bag or on its own antistatic mat on a flat, stable surface.

10. If necessary, remove each installed PIC from the FPC. For information about removing a PIC, see Removing a T640 PIC.
11. After you remove each PIC, immediately place it on an antistatic mat or in an electrostatic bag.
12. If you are not reinstalling a FPC into the emptied FPC slot within a short time, install a blank FPC panel over the slot to maintain proper airflow in the FPC card cage.

    Caution: After removing an FPC from the chassis, wait at least 30 seconds before reinserting it, removing an FPC from a different slot, or inserting an FPC into a different slot.

Figure 1: Removing a T640 FPC

Installing a T640 FPC

To install an FPC (see Figure 3):

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. Place the FPC on an antistatic mat.
3. Take each PIC to be installed in the replacement FPC out of its electrostatic bag, and identify the slot on the FPC where it will be connected.
4. Verify that each fiber-optic PIC has a rubber safety cap covering the PIC transceiver. If it does not, cover the transceiver with a safety cap.
5. Install each PIC into the appropriate slot on the FPC. For information on installing a PIC, see Installing a T640 PIC.
6. Locate the slot in the FPC card cage in which you plan to install the FPC.
7. Inspect the slot in the FPC card cage to verify that there are no missing or bent pins on the midplane.
8. Inspect the FPC to verify that the connectors are not misaligned or damaged.

   Caution: When the FPC is out of the chassis, do not hold it by the ejector handles or edge connectors. They cannot support its weight.

9. Verify that the FPC is right-side up, with the components on the right of the FPC.
10. Lift the FPC into place and carefully align the bottom and top of the FPC with the guides inside the card cage.

    Figure 2: Installing an FPC

    
11. Gently rest the bottom edge of the FPC on the bottom edge of the slot opening, making contact a short distance forward of the power connector.

    Caution: Take care not to bend or otherwise damage the power connector prongs.

12. Slowly slide the FPC all the way into the card cage until you feel resistance.

    Caution: To avoid damaging the FPC, make sure that you keep the bottom of the FPC flat as you slide it into the slot.

13. Starting with the ejector handles on the FPC faceplate nearly horizontal, simultaneously turn both ejector handles clockwise to seat the FPC.
14. If you are installing a Type 2 FPC or Type 3 FPC, tighten the screws inside the ejector handles to secure the FPC. Do not overtighten them.
15. Remove the rubber safety cap from each fiber-optic transceiver and cable.

    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.

16. Insert the appropriate cable into the cable connector ports on each PIC on the FPC. Secure the cables so that they are not supporting their own weight. Place excess cable out of the way in a neatly coiled loop, using the cable management system. Placing fasteners on a loop helps to maintain its shape.

    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.

    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.

17. Use one of the following methods to bring the FPC online:
    • Press and hold the FPC online/offline button until the green OK LED next to the button lights steadily, in about 5 seconds. The LEDs and online/offline button for each FPC are located directly above it on the craft interface.
    • Issue the CLI command:
      user@host>request chassis fpc slot slot-number online

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

    Caution: After the OK LED lights steadily, wait at least 30 seconds before removing the FPC again, removing an FPC from a different slot, or inserting an FPC in a different slot.

You can verify correct FPC and PIC functioning by issuing the show chassis fpc and show chassis fpc pic-status commands, as described in Maintaining T640 FPCs and Maintaining T640 PICs and PIC Cables.

Figure 3: Installing a T640 FPC