Universal Broadband Router Hardware Installation Guide

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Cisco uBR10012 Universal Broadband Router Hardware Installation Guide
OL-18259-01
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.