Cisco 10000 Series

CHAPTER
2-1
Cisco 10000 Series Router Troubleshooting Guide
OL-0439-02
2
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:
• DC PEM Faults, page 2-1
• AC PEM Faults, page 2-3
• Other Electrical Problems, page 2-4
• Blower Module Faults, page 2-5
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.
Tip To quickly check the functional status of your PEMs, use the show environment command.
DC PEM faults can occur for the following reasons:
• PEM failure
• Reversed power cables
• Backplane interface failures or damage