Juniper Networks M5 - Manual (Page 108)

Replace Packet Forwarding Engine Components
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 M5 and M10 Internet Routers PIC Guide. The offline button for each PIC is
located below it on the craft interface and is labeled with the PIC slot number.
•
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 Internet Software
Operational Mode Command Reference: Protocols, Class of Service, Chassis, and
Management.
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.
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.
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.
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.
88 M5 and M10 Internet Routers Hardware Guide