Juniper Networks M5 - Manual (Page 84)

Connect PIC Cables
2. If the PIC cable connector port is covered by a rubber safety plug, remove the plug.
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.
3. Insert the cable connector into the cable connector port on the PIC faceplate.
4. 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.
Do not let fiber-optic cable hang free from the connector. Do not
allow fastened loops of cable to dangle, which stresses the cable at
the fastening point.
64 M5 and M10 Internet Routers Hardware Guide