Cisco Systems Cisco uBR10012 manual Troubleshooting the Power Subsystem

Chapter 4 Troubleshooting the Installation

Troubleshooting the Power Subsystem

Troubleshooting the Power Subsystem

AC power entry modules, DC power entry modules, or an AC power shelf combined with the DC power modules are used to power the Cisco uBR10012 router.

Troubleshooting the AC Power Subsystem

Use the following steps to isolate a problem with the AC power subsystem.

Step 1 Use the show environment command to display the general health of the power system.

Router# show environment
Temperature	normal: chassis inlet measured at 29C/84F
Temperature	normal: chassis core measured at 42C/107F
Fan:			OK
Power Entry	Module 0	type DC status:	OK
Power Entry	Module 1	type DC status:	OK
Router#

Note The show environment command provides accurate information on the AC PEM only when using Cisco IOS Release 12.2(4)XF1, 12.2(4)BC1a, or a later release. If using and earlier release, the show environment command does not correctly identify the AC PEM error messages.

a.Verify that the temperatures are within the valid operating ranges, and that the fan assembly and both AC PEM modules are present and OK.

b.If this is not the case, check for the following issues:

–Fan is reported MISSING—Insert the fan assembly or shut down the router immediately to avoid running the router beyond its operating temperature range.

–AC PEM is not listed—Verify that both AC PEMs are present, and if so, that each PEM is fully inserted into the chassis.

–The “Input/Output Voltage Fault” message indicates that the output voltage from one of the AC PEMs is not within the correct range. This can occur when the input AC voltage to the AC PEM is either too low or too high. Measure the input AC voltage, and if it is correct, the AC PEM has failed and should be replaced.

Note Wall input voltage for the AC PEM must be 200 - 240 VAC at 50/60Hz.

Step 2 Verify that the power LED on each AC PEM is green.

a.If yes, the PEM is connected to an active AC power source and is supplying power to the chassis.

b.If the Power LED is not on, and if no other LEDs are on, verify that the plug is securely inserted into the wall plug and the AC power socket.

c.If the AC PEM LED is still off, try connecting the AC power cable to another wall outlet.

Step 3 Check to see if the PEM Fault LED is yellow.

If yes, it indicates that the AC PEM is connected to an active AC power source but is not providing power to the chassis. Check that the PEM is properly inserted into the chassis and that its power switch is on.

Cisco uBR10012 Universal Broadband Router Hardware Installation Guide

OL-18259-01 4-7