NOTE: While you install the T640-SIB or replace a fiber-optic array cable,
small deposits of oil and dust can enter the T640-SIB fiber-optic array
adapters, the fiber-optic array cableconnectors, and the loopback connectors
and adapters. We recommend you clean the optics in these components, as
well as the loopback connector and adapter dust covers, immediately before
connecting them. For cleaninginstructions, see the TX Matrix Router Hardware
Guide.
To install a T640-SIB into the rear of the chassis (see “Installing a T640 Standard SIB
or Standard SIB Version B” on page 426):
1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
the strap to one of the ESD points on the chassis.
2. Place one hand under the bottom edge of the T640-SIB and one hand around the
top of the T640-SIB faceplate.
3. If applicable, remove the protective tape covering each T640-SIB fiber-optic array
adapter.
4. Remove the dust covers from the fiber-optic array cable connectors. To remove a
dust cover, loosen the thumbscrew and captive screw on the connector. (Use the
supplied small slotted screwdriver to loosen the captive screw.) Store the dust covers
in a dust-free resealable plastic bag.
5. Install the cable connector to the fiber-optic array adapter. Align the connector with
the fiber-optic array adapter, and carefully press it into the adapter until it stops. The
cable connector and adapter are keyed to ensure proper mating.
NOTE: The optics in a fiber-optic array adapter are spring loaded, so you
must continue to apply force to a fiber-optic array cable connector or
loopback connector while securing it to a TX-SIB or T640-SIB adapter.
WARNING: Do not look directly into a fiber-optic array adapter or a
connector at the end of a fiber-optic array cable attached to an adapter.
The fiber optics emit laser light that can damage your eyes.
6. Partially tighten the thumbscrew and captive screw on the fiber-optic array cable
connector. (Use the supplied small slotted screwdriver to tighten the captive screw.)
Alternate between the thumbscrew and captive screw until the cable connector is
secured to the adapter.
431Copyright © 2017, Juniper Networks, Inc.
Chapter 30: Replacing Switch Fabric Components
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