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M160 Internet Router Hardware Guide
Maintaining PICs and PIC Cables
To maintain PICs and PIC cables, follow these guidelines:
Check the LEDs on PIC faceplates. Most PIC faceplates have an LED labeled
STATUS.SomePICshaveadditionalLEDs,oftenoneperport.Themeaningof
the LED states differs for various PICs. For more information, see the M160
Internet Router PIC Guide.IftheFPCthathousesthePICdetectsaPICfailure,
the FPC generates an alarm message to be sent to the Routing Engine.
Issue the CLI show chassis fpc pic-status command. The PIC slots in an FPC are
numbered from
0 through 3, top to bottom:
user@host> show chassis fpc pic-status
Slot 0 Online
PIC 0 4x OC-3 SONET, MM
PIC 1 1x CSTM1, SMIR
PIC 3 2x OC-3 ATM, MM
Slot 1 Online
PIC 0 1x OC-12 SONET, MM
PIC 1 1x OC-12 ATM, MM
PIC 2 2x OC-3 ATM, MM
PIC 3 2x OC-3 ATM, MM
For further description of the output from the command, see the JUNOS
Protocols, Class of Service, and System Basics Command Reference.
Use the cable management system (shown in Figure 21) to support cables and
prevent cables from dislodging or developing stress points.
Place excess cable out of the way in the cable management system. Do
not allow fastened loops of cable to dangle from the connector or cable
management system, because this stresses the cable at the fastening point.
Putting fasteners on the loops helps to maintain their shape.
Keep the cable connections clean and free of dust and other particles, which
can cause drops in the received power level. Always inspect cables and clean
them if necessary before c onnecting an interface.
Label both ends of PIC cables to identify them.
134 M aintaining Packet Forwarding Engine Components