Internet Router Hardware Guide

Replacing Hardware Components
CAUTION: Avoid bending fiber-optic cable beyond its minimum bend radius. An arc
smaller than a few inches in diameter can damage the 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 M160 Internet Router PIC Guide. You can also verify
PIC functioning by issuing the
show chassis fpc pic-status command described in
“Maintaining PICs and PIC Cables” on page 134.
Replacing Power System Components
For instructions on replacing power system components, see the following sections:
Replacing the Circuit Breaker Box on page 193
Replacing a Pow er Supply on page 197
Disconnecting and Connecting Power on page 200
Replacing a Fuse on page 204
Replacing the C ircuit Breaker Box
The circuit breaker box is field-replaceable, but you must power off the router
before removing or replacing it.
To replace the circuit breaker box, perform the following procedures:
Removing the Circuit Breaker Box on page 193
Installing the Circuit Breaker Box on page 195
Removing the Circuit Breaker Box
The circuit breaker box is located on the rear of the chassis above the right
power supply, as shown in Figure 2 . It weighs about 6 lb (2.7 kg).
CAUTION: Do not remove the grounding lug from the grounding points on the
chassisduringthisprocedure.
To remove the circuit breaker box, follow this procedure (see Figure 99):
Replacing Power System Components 193