Chapter 2 Pem Faults And Blower Failures; Dc Pem Faults - Cisco 10000 Series Troubleshooting Manual

PEM Faults and Blower Failures
The following sections provide methods for troubleshooting faults involving the Cisco 10000 series
router Power Entry Modules (PEMs) and blower modules.
This chapter contains the following major sections:
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DC PEM Faults

DC PEMs can be installed in two modes—redundant and nonredundant. It is recommended that you
install PEMs in a redundant configuration. A PEM failure in a nonredundant configuration causes a
system failure.
To quickly check the functional status of your PEMs, use the show environment command.
Tip
DC PEM faults can occur for the following reasons:
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OL-0439-02
DC PEM Faults, page 2-1
AC PEM Faults, page 2-3
Other Electrical Problems, page 2-4
Blower Module Faults, page 2-5
PEM failure
Reversed power cables
Backplane interface failures or damage
C H A P T E R
Cisco 10000 Series Router Troubleshooting Guide
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