Cisco Systems UBR10012 manual 2400W AC-Input Power Shelf, Description

Chapter 2 PEM Faults and Fan Assembly Failures

2400W AC-Input Power Shelf

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 2-4lists the DC PEM fault symptoms and corrective actions.

Table 2-4 DC PEM Fault Symptoms and Corrective Action

Fault Symptom	Corrective Action
Green LED on PEM	1. Make sure the circuit breaker on the PEM is turned on.
fails to light	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	1. Ensure that the input power to both slots is correct.
problems in one	2.	If the problem persists, contact Cisco TAC.
slot but operates
normally in a
different slot
Fault LED is lit	1. Check to see if the circuit breaker (on/off switch) has tripped. If it has,
yellow		return the switch to the ON position.
	2.	Replace PEM with a known good replacement.
	3.	Contact Cisco TAC.
Miswire LED is lit	If the MISWIRE LED is on, the power cables are reversed. Power off the PEM
yellow	and the external power source and reconnect the wires correctly. See the
	Cisco uBR10012 Universal Broadband Router Hardware Installation Guide.

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.

Cisco uBR10012 Universal Broadband Router Troubleshooting Guide

OL-1237-01 2-5