Juniper MX2020 Hardware Manual page 593

WARNING:
of fiber-optic cables. Fiber-optic transceivers and fiber-optic cables connected
to transceivers emit laser light that can damage your eyes.
WARNING:
inserting or removing a cable. The rubber safety cap keeps the port clean and
prevents accidental exposure to laser light.
CAUTION:
An arc smaller than a few inches in diameter can damage the cables and cause
problems that are difficult to diagnose.
4. Remove the cable connected to the transceiver (see
Cover the transceiver and the end of each fiber-optic cable connector with a rubber safety cap
immediately after disconnecting the fiber-optic cables.
Do not look directly into a fiber-optic transceiver or into the ends
Do not leave a fiber-optic transceiver uncovered except when
Do not bend fiber-optic cables beyond their minimum bend radius.
"Disconnecting a Fiber-Optic Cable" on page
575
655).