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Cisco 12404 Internet Router Installation and Configuration Guide
OL-11636-01
Chapter 4 Troubleshooting the Installation
Troubleshooting the Processor Subsystem
•
Check the power cables from the power source to the Cisco 12404 router.
•
Verify that it is in good shape and is not damaged.
•
If the insulation appears cracked or broken, or the plugs appear loose, do not
use the cable. Immediately replace it with a new cord or cable.
•
If the LED fails to go On after you connect the power supply to a new power
source. Turn the power switch Off and exchange the power cable with a
replacement, if one is available, and turn the power switch back on. If the
INPUT OK LED then goes on, return the first power cable for replacement.
•
If the LED still fails to go on when connected to a different power source with
a new power cable, the PEM is probably faulty. If a spare PEM is available,
replace the existing module with the spare and restart the system.
•
If the INPUT OK LED then goes on, return the faulty PEM for replacement.
If you are unable to resolve the problem or if you determine that either the PEM,
PDU or power cable is faulty, contact a service representative for assistance.
Troubleshooting the Processor Subsystem
The Cisco 12404 Internet router processor subsystem consists of the RP, the line
cards, and the CSF card. 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 12404 router requires one RP be installed. The system cannot operate
unless the RP is installed. A line card that is partially connected to the backplane
will send incomplete signals to the RP, which could cause the system to hang.
Line cards should be completely installed and seated in the backplane connector
or fully removed and placed in a protective ESD device. If necessary, you can
troubleshoot individual line cards, but first ensure that the RP is installed properly
and the system software has initialized successfully.
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.
todd.book Page 21 Tuesday, November 27, 2007 6:02 PM
