Troubleshooting the Installation 5-15
Troubleshooting the Processor Subsystem
•Is a critical, major, or minor alarm LED on the CSC(s) on?
—If any one of the three system alarm LEDs is on, a fault has been detected in the
system. Check the console for messages indicating the source of the problem.
—A false error indication may be originating from the RP. Reseat or replace the RP.
Caution The RP reset switch resets the RP and the entire system. To prevent system errors
and problems, use the RP reset switch only at the direction of your Cisco-certified service
representative.
Troubleshooting the Line Cards
Line cards can be installed in any slot in the upper card cage, except for the two slots in the
middle of the card cage, which are reserved for the CSCs. Also, by convention, the left-most
slot in the upper card cage is occupied by the RP. However, you need not follow this
recommendation.
As each line card powers up in response to a command issued by the RP across the MBus,
a power-on self-test (POST) is performed on line card memory. A full set of field
diagnostics can also be run on a line card from the system console. The diagnostics provide
a pass/fail message in the line card alphanumeric displays, as well as on the system console.
To isolate a problem with a line card, make the following assessment:
•Are both line card alphanumeric displ ays on?
—If both alphanumeric displays are off, the line card may not be fully inserted into
the backplane, there may be a problem with the MBus module on the line card, or
the system power supply may be off.
The two line card alphanumeric displays are powered separately. The top display
receives power from the DC-DC converter on the line card, and the bottom display
receives power from the MBus. Thus, even if the line card has no t powered up, the
bottom display could be on.
—If both displays are on, check the message being displayed. As soon as the DC-DC
converter is turned on by the MBus module, the processor on the line card begins
the boot process. Status messages appear in the alphanumeric displays as the boot