Chapter 4 Troubleshooting the Installation
Troubleshooting the Processor Subsystem
If you are unable to resolve the problem or if you determine that either the PEM or power wiring is faulty, contact a service representative for assistance.
Troubleshooting the Processor Subsystem
The Cisco XR 12404 router processor subsystem consists of the RP, the line cards, and the CSF card. The system cannot operate unless the RP is installed. The RP and the line cards each have two processors. One processor is the main processor; and the other processor is a component in the MBus module.
•The MBus module begins operation as soon as power is applied to the system. The MBus module determines the type of card it is mounted on and whether it should turn on the
•The RP MBus module turns on card power after a brief delay; the line card MBus modules delay turning on power until they receive a command from the RP.
A Cisco XR 12404 router requires that one RP be installed, or the system cannot operate. A line card that is partially connected to the backplane can send incomplete signals to the RP, which could cause the system to hang. If necessary, you can troubleshoot individual line cards, but first make sure that the RP is installed properly and the system software has initialized successfully.
Note The primary RP must be installed in Slot0 which is a narrow slot. If a redundant RP is installed in another slot, a narrow card filler panel must be used to ensure proper air flow through the chassis and electromagnetic compatibility (EMC).
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