Cisco XR 12406 Installation Manual page 142

Troubleshooting a DC Power Subsystem
Power off the PEM circuit breaker switch and check the DC power source.
Step 4
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Remove the PEM and insert it in the second bay in the router, or into a bay on
Step 5
another Cisco XR 12406 router.
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Is the OUTPUT OK LED on?
Step 6
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Note
Cisco XR 12406 Router Installation Guide
4-12
Check the DC power wires from the power source to the router.
– Verify that the power wires are fastened securely at the PDU and the DC
source.
Verify that the power wires are not worn or damaged. If the insulation
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appears cracked or broken, have the power wires replaced.
Make sure that the DC power source circuit breaker is on, and that it has the
proper current rating.
Verify that each PEM in the router is attached to a separate DC power source.
Power on the PEM circuit breaker.
If the PEM INPUT OK LED goes on, go to Step 6.
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If the PEM INPUT OK LED remains, go to Step 5.
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If the INPUT OK LED remains off, the PEM is faulty and needs to be
replaced.
If the INPUT OK LED goes on, the input portion of the PEM is working
normally, go to Step 6.
If yes, the power source is good and the PEM is operating normally.
If no, and there is no other system activity (blower module is off; line cards
are unpowered), the PEM is fault. Replace the PEM.
If no, but the blower module is operating, it means all internal DC voltages
are within tolerance. Suspect a faulty OUTPUT OK LED.
Use the show environment command to check the voltages on each card.
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The blower module uses –48 VDC.
In a Cisco XR 12406 router with two power supplies, the output power
from the second power supply is adequate to maintain router operation.
Chapter 4 Troubleshooting the Installation
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