Cisco XR 12404 - Manual (Page 111)

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Cisco XR 12404 Router Installation Guide
OL-13830-02
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 DC-DC converter.
• 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).
A power-on self-test (POST) runs immediately at power-on to determine the
condition of the RP memory. Results are displayed in the alphanumeric LED
display as a pass/fail message.
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