Chapter 4 Troubleshooting the Installation
Troubleshooting an AC Power Subsystem
•Verify that each power supply in the router is attached to a separate AC power source.
•If the router is connected to an uninterruptable power supply (UPS), verify that the UPS is functioning correctly. Note that there might be a UPS for each power supply in the system.
If the AC power source wiring appears to be okay, but the power supply
OUTPUT OK LED remains off, go to Step 3.
Step 3 Plug the power cord into a different, but compatible AC outlet.
•If the power supply OUTPUT OK LED is on, the original AC outlet is faulty and cannot be used. Notify the appropriate facilities personnel and go to Step 6.
•If the power supply OUTPUT OK LED remains off, go to Step 4.
Step 4 Exchange the existing power cord for another power cord.
•If the power supply OUTPUT OK LED is on, the original power cord is faulty and must be replaced. The AC portion of the power supply is working normally, go to Step 6.
•If the OUTPUT OK LED still fails light when connected to a different power source with a new power cord, the power supply is probably faulty. Go to Step 5.
Step 5 If a spare power supply is available, replace the existing module with the spare and restart the system.
•If the OUTPUT OK LED on the spare power supply is on, the power supply is working normally, go to Step 6. The original power supply is faulty and should be returned for replacement.
Step 6 Is the power supply INPUT OK LED on?
•If yes, the power supply is functioning normally.
Note In a Cisco XR 12406 router with two power supplies, the output power from the second power supply is adequate to maintain router operation.
•If no, and there is no other system activity (fan assembly is off; line cards are not powered), the power supply is faulty. Replace the power supply.
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