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 havean 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 analarm 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 0through 3, top tobottom:
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 furtherdescription 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
preventcables from dislodging or developing stress points.
Place excess cable out of the way in the cable man agement system. Do
not allow fastened loops of cable to dangle fromthe connector or cable
management system, because thisstresses the cable at the fastening point.
Putting fasteners on the loops helps to maintain their shape.
Keep the cable connectionsclean and free of dust and other particles, which
can cause drops in the receivedpower level. Always inspect cables and clean
them if necessary before connecting an interface.
Label both ends of PIC cables to identify them.
134 Maintaining Packet ForwardingEng ine Components