Juniper Internet Router M160 Hardware Manual page 204

M160 Internet Router Hardware Guide
4.
5.
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.
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.
180
Replacing Packet Forwarding Engine Components
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-slot pic-slot pic-slot
offline
For more information about the command, see the JUNOS Protocols, Class of
Service, and System Basics Command Reference.
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.
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.
Unscrew the thumbscrews at the top and bottom of the PIC faceplate
simultaneously and at about the same rate (unscrewing the two screws