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FPCs for the M20 Router and the M40 Router

This section describes the chassis, the supported FPCs, and how to replace FPCs for the M20 and M40 routers.

Chassis Descriptions

In an M20 router, you can install up to four FPCs horizontally into the midplane from the front of the chassis (below the SSB). You reference each FPC by its slot number. Slots are numbered FPC0 to FPC3 from top to bottom in the chassis. Each FPC holds up to four PICs.

In an M40 router, you can install up to eight FPCs vertically into the backplane from the front of the chassis (four on either side of the SCB). You reference each FPC by its slot number. Slots are numbered FPC0 to FPC7 from left to right in the chassis. Each FPC holds up to four PICs.

FPC Description

The M20 and M40 routers support the Enhanced M20/M40 FPC. Enhanced FPCs for the M20 and M40 routers are labeled with an E sticker on the faceplate. Enhanced Plus FPCs, supported on the M20 router, are labeled with an EP sticker on the faceplate.

Removing an FPC

On an M20 router, the FPCs are installed in the front of the chassis below the craft interface. On an M40 router, the FPCs are installed in the front of the chassis above the craft interface.

To remove an FPC from an M20 or M40 router, follow this procedure:

  1. Place an antistatic foam mat on a flat, stable surface to receive the FPC. If a foam mat is not available, use a standard flat antistatic mat, but use extra care when laying the FPC on it to avoid damaging the electrical components. If any PICs on the FPC use fiber-optic cable, also have ready a rubber safety cap for each transceiver and cable.
  2. Attach an ESD wrist 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 reconnect each cable to the correct PIC.
  4. Take the FPC offline by pressing and holding its offline button for 5 seconds or until the green OK LED next to the button goes out. On the M20 router, the FPC offline buttons are in a column on the right side of the craft interface. On the M40 router, the offline button for each FPC is on the craft interface just below the FPC slot.
  5. Disconnect the cables from the PICs on the FPC. If a PIC uses fiber-optic cable, immediately cover each transceiver and the end of each cable with a rubber safety cap.
  6. Carefully drape each disconnected cable in the cable management system on the chassis front to prevent the cables from developing stress points.   

    Do not look directly into the ends of fiber-optic cables or into the transceivers on the interface faceplate. Single-mode fiber-optic cable and the interfaces that use it (such as ATM and SONET/SDH interfaces) emit laser light that can damage your eyes.

    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.

    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.

  7. Unscrew the thumbscrews at the ends of the FPC.
  8. Pull the ends of the extractor clips, which are adjacent to the thumbscrews, away from the face of the FPC. See Figure 8 (M20 router) or Figure 9 (M40 router).
  9. Grasp the FPC with both hands and slide it about halfway out of the chassis.
  10. Place one hand underneath the FPC to support it, and slide it completely out of the chassis.
  11. Set the FPC on the antistatic foam mat that you prepared in Step Step 1, component-side up and with the PIC faceplates facing you. 

    To avoid damaging any components, use extra care when laying the FPC on the antistatic mat, particularly if the mat is not made of foam.

    Do not stack the FPC on top of or under any other component.

    Figure 8: Removing an FPC from an M20 Router

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    Figure 9: Removing an FPC from an M40 Router

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Installing an FPC

To install an FPC into an M20 or M40 router, follow this procedure:

  1. Attach an ESD wrist strap to your bare wrist and connect the wrist strap to one of the two ESD points on the chassis.
  2. You must install or remove PICs before installing the FPC into the chassis. See the PIC, SFP, and XENPAK Installation Instructions. If any PICs use fiber-optic cable, make sure that each transceiver is covered with a rubber safety cap.
  3. Grasp the front of the FPC with both hands and align the rear with the guides in the FPC slot in the chassis.
  4. Slide the FPC all the way into the card cage until it contacts the midplane (on an M20 router) or the backplane (on an M40 router). 

    When about 1 in. (2.5 cm) of the FPC remains outside the slot, adjust the insertion speed so that the FPC contacts the midplane (on an M20 router) or backplane (on an M40 router) in between 1 and 15 seconds. Completing the insertion too quickly or too slowly can cause the router to reset.

  5. Push the ends of the extractor clips (at the ends of the FPC) inward toward the face of the FPC. See Figure 10 (M20 router) or Figure 11 (M40 router).
  6. Tighten the thumbscrews at the ends of the FPC.
  7. If any PICs on the FPC connect to fiber-optic cable, remove the rubber safety cap from each transceiver and the end of each cable. 

    Do not look directly into the ends of fiber-optic cables or into the transceivers on the interface faceplate. Single-mode fiber-optic cable and the interfaces that use it (such as ATM and SONET/SDH interfaces) emit laser light that can damage your eyes.

  8. Insert the appropriate cables into the cable connector ports on each PIC on the FPC. Secure the cables so that they do not support their own weight. Use the cable management system to place excess cable out of the way in a neatly coiled loop. Placing fasteners on a loop helps to maintain its shape.  

    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.

    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.

  9. If you are installing multiple FPCs, repeat Step Step 2 through Step Step 8 for each one.
  10. Press the online button or issue the request chassis fpc slot-number online command.

    Figure 10: Installing an FPC into an M20 Router

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    Figure 11: Installing an FPC into an M40 Router

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