M160 Internet Router Hardware Guide
Installing a PCG
To installa PCG, follow this procedure (see Figure 91):
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
is attached to a proper earth ground. For more information about ESD, see
“Preventing ElectrostaticDischarge Damage” on page 226.
2. Place one hand under the PCG to support itand grasp the thumbscrew on
the faceplate with the other hand.
3. AligntherearofthePCGwiththeguidesinsidethechassisandslideit
in completely.
4. Tighten the thumbscrew on the faceplate to seat the PCG firmly in the chassis.
5. Verify that the green LED labeled OK lights steadily, which takes about
3seconds.
You can also verify correct PCG functioning by issuing the
show chassis environment pcg command, as described in “Mai ntaining the PCGs”
on page 135.
6. Reinstallt herear component cover and tighten the thumbscrew ateach corner
to secure it tothe chassis. For complete instructions, see “Reinstallingthe Rear
Component Cover” on page 109.
CAUTION: To maintain proper airflow and provide electromagnetic shield ing, do
not operate the routerwithout the rear component cover in place.
178 Replacing Packet Forwarding Engine Components