Replacing Hardware Components
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.
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 showchas sis fpc pic-status command described in
“Maintaining PICs and PIC Cables” onpage 134.
Replacing Power System Components
For instructionson replacing power system components, see the following sections:
Replacing the CircuitBreaker Box on page 193
Replacing a Power Supply on page 197
Disconnecting and Connecting Poweron page 200
Replacing a Fuse on page 204
Replacing the Circuit Breaker Box
The circuit breakerbox is field-replaceable, but you must poweroff the router
before removing o r replacing it.
Toreplace the circuit breaker box, perform the following procedures:
Removing the CircuitBreaker Box on page 193
Installing the CircuitBreaker Box on page 195
Removing the Circuit Breaker Box
The circuit breakerbox 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 groundinglug from the grounding points on the
chassisduringthisprocedure.
To removethe circuit breaker box, followthis procedure (see Figure 99):
Replacing Power System Components 193