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Cisco uBR10012 Universal Broadband Router Troubleshooting Guide
OL-1237-01
Chapter 2 PEM Faults and Fan Assembly Failures
2400W AC-Input Power Shelf
Table 2-4 lists the DC PEM fault symptoms and corrective actions.
Tip Securely tighten the captive screws on your PEMs to prevent heightened levels of electromagnetic
interference.
2400W AC-Input Power Shelf
The 2400W AC-input power shelf converts AC-output power from an external AC power source into DC
power that is suitable for powering the Cisco uBR10012 router. The power shelf supplies –54 VDC
output power to the two DC PEMs in the Cisco uBR10012 chassis.
Table 2-3 DC PEM LEDs
LED Description
Power (green) PEM is powered on and is operational.
Fault (yellow) PEM is not operating correctly or the circuit breaker is in the OFF position.
Miswire (yellow) Input DC power cables are wired incorrectly and should be reversed.
Table 2-4 DC PEM Fault Symptoms and Corrective Action
Fault Symptom Corrective Action
Green LED on PEM
fails to light
1. Make sure the circuit breaker on the PEM is turned on.
2. Make sure the PEM is properly seated and screwed in place.
3. Make sure power leads are properly connected to power connectors on the
backplane. If connections are loose or their polarity is reversed, the chassis
does not receive power.
4. Check the external power source.
5. Move the PEM to the other PEM slot. If the PEM still fails, replace it.
PEM experiences
problems in one
slot but operates
normally in a
different slot
1. Ensure that the input power to both slots is correct.
2. If the problem persists, contact Cisco TAC.
Fault LED is lit
yellow
1. Check to see if the circuit breaker (on/off switch) has tripped. If it has,
return the switch to the ON position.
2. Replace PEM with a known good replacement.
3. Contact Cisco TAC.
Miswire LED is lit
yellow
If the MISWIRE LED is on, the power cables are reversed. Power off the PEM
and the external power source and reconnect the wires correctly. See the
Cisco uBR10012 Universal Broadband Router Hardware Installation Guide.