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CHAPTER
2-1
Cisco uBR10012 Universal Broadband Router Troubleshooting Guide
OL-1237-01
2
PEM Faults and Fan Assembly Failures
The following sections provide methods for troubleshooting faults involving the Cisco uBR10012 DC
Power Entry Modules (PEMs), the optional 2400W AC-input power shelf, and fan assembly module.
This chapter contains the following major sections:
• AC PEM Faults, page 2-1
• DC PEM Faults, page 2-3
• 2400W AC-Input Power Shelf, page 2-5
• Other Electrical Problems, page 2-6
• Fan Assembly Module Faults, page 2-7
AC PEM Faults
On the Cisco uBR10012 router, two AC PEMs are installed in a redundant configuration, which allows
one AC PEM to fail without affecting system operations. A single PEM can power the router for
sufficient time to request and install a new PEM to replace the one that failed.
Tip To quickly check the functional status of your PEMs, use the show environment command.
AC PEM faults can occur for the following reasons:
• PEM failure
• Invalid AC-input power being supplied by the power source
• Backplane interface failures or damage
Figure 2-1 illustrates the AC PEM and its indicators. Table 2-1 describes the indicators.