Internet Router Hardware Guide

M160 Internet Router Hardware Guide

4. Use one of the following methods to take the PIC offline:

Press and ho ld the PIC offline button until its failure indicator LED lights,

which usually takes about 5 seconds. The failure LED is usually red; for

more information, see the M160 Internet Router PIC Guide.ForthePICs

that install on an FPC1, the offline button for each PIC is next to it on the

FPC card carrier. For the PICs that install on an FPC2, the offline button is

onthePICfaceplate. SeeFigure6.

Issue the following CLI command:

user@host>request chassis pic fpc-slot

fpc-slot

pic-slot

offline

For more information about the command, see the JUNOS Protocols , Class of

Service, and System Basics Command Reference.

5. Disconnect the cables from the PIC. 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 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.

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.

6. 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.

7. Unscrew the thumbscrews at the top and bottom of the PIC faceplate

simultaneouslyandataboutthesamerate(unscrewingthetwoscrews

180 R eplacing Packet Forwarding Engine Components