Juniper QFX5220, Руководство по оборудованию, Страница: 167 / 247

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When you unplug a fiber-optic cable from a transceiver, place rubber safety caps over the transceiver
and on the end of the cable.
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Anchor fiber-optic cables to prevent stress on the connectors. When attaching a fiber-optic cable to a
transceiver, be sure to secure the fiber-optic cable so that it does not support its own weight as it hangs
to the floor. Never let a fiber-optic cable hang free from the connector.
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Avoid bending fiber-optic cables beyond their minimum bend radius. Bending fiber-optic cables into
arcs smaller than a few inches in diameter can damage the cables and cause problems that are difficult
to diagnose.
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Frequent plugging and unplugging of fiber-optic cables in and out of optical instruments can damage
the instruments, which are expensive to repair. Attach a short fiber extension to the optical equipment.
Any wear and tear due to frequent plugging and unplugging is then absorbed by the short fiber extension,
which is easier and less expensive to replace than the instruments.
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Keep fiber-optic cable connections clean. Microdeposits of oil and dust in the canal of the transceiver
or cable connector can cause loss of light, reduction in signal power, and possibly intermittent problems
with the optical connection.
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To clean the transceiver canal, use an appropriate fiber-cleaning device such as RIFOCS Fiber Optic
Adaptor Cleaning Wands (part number 946). Follow the directions in the cleaning kit you use.
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After cleaning the transceiver, make sure that the connector tip of the fiber-optic cable is clean. Use
only an approved alcohol-free fiber-optic cable cleaning kit such as the Opptex Cletop-S
®
Fiber Cleaner.
Follow the directions in the cleaning kit you use.
RELATED DOCUMENTATION
QFX5220 Network Cable and Transceiver Planning | 91
Powering Off a QFX5220
NOTE: Use the following procedure to turn off power on a QFX5220 switch.
Before you remove the power cord to power off a QFX5220:
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Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage.
See “Prevention of Electrostatic Discharge Damage” on page 235 .
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