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— If the LED fails to go on after you connect the power supply to a new power source,
— If the LED still fails to go on when connected to a different power source with a new
If you are unable to resolve the problem or if you determine that either the power supply
or power cable is faulty, contact a service representative for assistance.
Troubleshooting the Processor Subsystem
The Cisco 12012 processor subsystem consists of the RP, the line cards, and the alarm card.
The RP and the line cards each have two processors: one processor is the card's 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 12012 requires one RP be installed. The system cannot operate unless the RP is
installed properly; however, the system can operate without any line cards installed as long
as none are in partial contact with the backplane pins. A line card that is partially connected
to the backplane will send incomplete signals to the RP, which could cause the system to
hang. Therefore, first ensure that the RP is installed properly and the system software has
initialized successfully. Then, if necessary, you can troubleshoot individual line cards.
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.
exchange the power cable with a replacement, if one is available, and turn the power
switch back on. If the AC (or input) OK LED then goes on, return the first power
cable for replacement.
power cable, the power supply is probably faulty. If a spare power supply is
available, replace the existing power supply with the spare and restart the system.
If the Input OK LED then goes on, return the faulty power supply for replacement.
Troubleshooting the Processor Subsystem
Troubleshooting the Installation 5-9
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Troubleshooting
