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CAUTION: 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 the cable 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.

CAUTION: 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.

CAUTION: Avoid bending fiber-optic cable beyond its minimum bend

radius.An arc smaller than a few inches in diameter can damagethe cable

and cause problems that are difficult to diagnose.

7. Verify that the status LEDs on the PIC faceplate indicate that the SFP is functioning

correctly (there is an LED for each SFP port). For more information about the PIC

LEDs, see the interface module reference for your device. You can also verify PIC

functioning by issuing the show chassis fpc pic-status command.

Documentation

T640 Preventing Electrostatic Discharge Damage on page 506•

• T640 PIC Description on page 79

• T640 Packet Forwarding Engine Architecture on page 7

Replacing a T640 SIB

Five SIBs are installed in the T640 router. The SIBs are located in the rear of the chassis

in the slots marked SIB0 through SIB4. Each SIB weighs approximately 6.8 lb (3.1 kg).

SIBs are hot-insertable and hot-removable.

NOTE: SIB version B is supported in Junos OS Release 7.3 and later. You can

use a SIB or SIB version B in a chassis running Junos 7.3 or later, but you cannot

use both on the same chassis at the same time.

If you use one or more FPC4s or Enhanced Scaling FPCs in a T640 router that

is not part of a routing matrix, each SIB in the router must be a SIB version B.

T640 Core Router Hardware Guide

Juniper T640 Hardware Guide

Other manuals for Juniper T640