Juniper Networks M160 manual Service, and System Basics Command Reference

M160 Internet Router Hardware Guide

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

Press and hold 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. For the PICs 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 on the PIC faceplate. See Figure 6.

Issue the following CLI command:

user@host>request chassis pic fpc-slot fpc-slotpic-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 simultaneously and at about the same rate (unscrewing the two screws

180 Replacing Packet Forwarding Engine Components