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Replace an FPC in an M20 Router
On an M20 router, the FPCs are hot-insertable and hot-removable, so you can remove and
replace them without powering down the router. When you remove an FPC, the router
continues to function, but the PICs installed on the FPC do not receive or transmit data.
For instructions, see the following sections:
Remove an FPC from an M20 Router
The FPCs on an M20 router are located on the front of the chassis below the craft interface.
Each FPC, fully configured with four PICs, weighs about 3 lbs (1.5 kg).
To remove an FPC from an M20 router, follow this procedure:
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! Remove an FPC from an M20 Router on page 9
! Install an FPC in an M20 Router on page 10
Place a antistatic foam mat on a flat, stable surface to receive the FPC. If a foam mat is
not available, substitute a standard flat antistatic mat but use extra care when laying the
FPC on it to avoid damaging the electrical components. If any of the PICs on the FPC use
fiber-optic cable, also have ready a rubber safety cap for each transceiver and cable.
Attach an ESD strap to your bare wrist and connect the strap to one of the ESD points on
the chassis.
Label the cables connected to each PIC on the FPC so that you can reconnect the cables
to the correct PICs.
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. The FPC offline buttons are located in a
column at the right side of the craft interface.
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.
Carefully drape each disconnected cable over the covered metal hooks in the cable
management system at the top of 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 PIC faceplate. Single-mode
fiber-optic cable and the PICs that use it (such as ATM and
SONET/SDH interfaces) emit laser light that can damage
your eyes.
Do not leave a transceiver uncovered. The safety cap keeps
the port clean and prevents accidental exposure to laser
light.
Unscrew the thumbscrews at the left and right ends of the FPC.
Pull the ends of the extractor clips, which are adjacent to the thumbscrews, away from
the face of the FPC.
Replace an FPC in an M20 Router
FPC Installation Instructions
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