Universal Broadband Router Hardware Installation Guide

4-8
Cisco uBR10012 Universal Broadband Router Hardware Installation Guide
OL-18259-01
Chapter 4 Troubleshooting the Installation
Troubleshooting the Power Subsystem
Step 4 If none of the above suggestions correct the problem, the AC PEM could be faulty. Contact a service
representative for further instructions. See the
“Obtaining Documentation and Submitting a Service
Request” section on page xxi.
Troubleshooting the DC Power Subsystem
Use the following steps to isolate a problem with the DC 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#
a. Verify that the temperatures are within the valid operating ranges, and that the fan assembly and both
DC 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.
– DC PEM is not listed—Verify that both DC 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 DC
PEMs is not within the correct range. This can occur when the input DC voltage to the DC PEM
is either too low or too high. Measure the input DC voltage, and if it is correct, the DC PEM has
failed and should be replaced.
– An “External AC Supply Fault” message indicates that one of the power modules in the external
power supply is reporting either a fault, an over-temperature condition, or is missing. Check the
LEDs on the front panels of the power modules on the external power supply to discover which
module has the fault.
Note The show environment command shows status information about the external 2400 WAC-input
power supply only you have the newer model of the DC PEM (PEM) installed and when the
Cisco uBR10012 router is running Cisco IOS Release 12.2(4)XF or later release.
Step 2 Verify that the power LED on each DC PEM is green.
a. If yes, the PEM is connected to an active DC power source and is supplying power to the chassis.
b. If the Power LED is not on, and if no other LEDs are on, check the power source.
– DC power source—verify that the plug is securely inserted into the DC socket.
– AC power source—check that the AC-input power supply is on. If the LEDs on the AC power
supply is not on, troubleshoot the AC-input power shelf. See
“Troubleshooting the AC-Input
Power Shelf” section on page 4-9.