Replacing Hardware Components
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wris t and
connect the strap toone of the ESD points on the chassis. Make sure the router
is attached to a proper earth ground. For more information about ESD, see
“Preventing ElectrostaticDischarge Damage” on page 226.
3. Label the cable connected tothe SFP so that you can later reconnect it
to the correct SFP.
4. Disconnect the cable from the SFP.Immed iately coverthe transce iverand the
end of the cable with a rubber safety cap.
WARNING: Do not look directly into the ends of fiber-optic cables or into the
transceiverson the interface faceplate. Single-mode fiber-optic cableand the
interfaces that use it (such as ATMand SONET/SDH interfaces) emit laser light
that can damage your eyes.
CAUTION: Do not leave a fiber-optict ransceiveruncovered except when inserting
or removing cable. The safety cap keeps the port clean and preventsaccidental
exposure to laser light.
5. Arrange the cable in the cablemanagement system to prevent it from
dislodging or developing stress points. Secure the cable so that it is not
supporting its own weightas 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: Avoid bending fiber-optic cable beyond its minimum bend radius. An arc
smaller than a few inches indiameter can damage the cable and cause problems
that are difficult to diagnose.
6. Pull the ejector handle awayfrom the SFP faceplate to unseat the SFP from
the PIC. Pull the SFP out of the PIC and place it on the antistatic mat or in
the electrostatic bag.
Installing an SFP
To installa replacement SFP, follow this procedure (seeFigure 98):
1. Attach an electrostatic discharge (ESD) grounding strap to your bare wris t and
connect the strap toone of the ESD points on the chassis. Make sure the router
Replacing Packet ForwardingEngine Components 191