Cisco Systems UBR10012 manual Other Electrical Problems, Ac Ok, Dc Ok, Fault

Chapter 2 PEM Faults and Fan Assembly Failures

Other Electrical Problems

The power shelf includes three 1200-watt (W) AC-input power modules that plug into a common power backplane in the 2400W AC-input power shelf. Two 1200W AC-input power modules are capable of powering a fully configured Cisco uBR10012 router. The third power module provides full redundancy.

During normal operation, the three AC-input power modules provide automatic load-sharing with each power module supporting 33 percent of the power load. When you remove one of the AC-input power modules, the remaining power modules immediately ramp up to full power and maintain uninterrupted system power for a limited time. This allows you to replace the affected module without impacting system operations.

Faults on the 2400W AC-input power shelf can occur for the following reasons:

•The AC-input power to one or more power modules has failed.

•The AC power plug to one or more power modules has been removed or unplugged.

•One or more power modules has failed and must be replaced.

Figure 2-4illustrates the AC PEM and its indicators. Table 2-5describes the indicators.

Figure 2-4 AC-Input Power Shelf Front Panel

DC OK AC OK FAULT

DC OK AC OK FAULT

DC OK AC OK FAULT

		36137
		DC OK AC OK FAULT
Table 2-5 AC-Input Power Shelf Module LEDs
LED	Color	Description
AC OK	Green	The AC-input power to the power module is present and is within the proper
		range.
DC OK	Green	The power module is producing DC output power in the proper range.
FAULT	Red	This particular power module has failed and must be replaced. The 2400W
		AC-input power shelf can continue operating with only two out of the three power
		modules installed, but the failed module should still be replaced as soon as
		possible.

Other Electrical Problems

If the electrical problem cannot be traced to a PEM, check the unit for:

•Improper power cable connections to the Cisco uBR10012 router

•Improper installation of other field-replaceable units (FRUs)

Cisco uBR10012 Universal Broadband Router Troubleshooting Guide

2-6 OL-1237-01