Fan Assembly Module Faults - Cisco uBR10012 Troubleshooting Manual
Universal broadband router
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Also See for uBR10012:
- Hardware installation manual (280 pages) ,
- Software configuration manual (240 pages) ,
- Quick start manual (72 pages)
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Chapter 2
PEM Faults and Fan Assembly Failures
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Fan Assembly Module Faults
The fan assembly module is critical to the operation of the Cisco uBR10012 router because it allows the
router to maintain proper operating temperatures. Severe overheating can result in system failure, so a
fan assembly module must always be present in the chassis while the router is operating.
Figure 2-5
Figure 2-5
Fan
assembly
The Cisco uBR10012 fan assembly module contains four fans in a redundant configuration. One fan can
fail without affecting system operations. If more than one fan fails, however, the fan assembly module
must be replaced immediately to avoid overheating the system.
The fan assembly module draws air in from the bottom front of the Cisco uBR10012 router, through the
air filter at the bottom of the front bezel. The air is drawn up through the line cards, and then exits
through the vents at the top rear of the router.
Figure 2-6
installed. The air flow when two AC PEMs are installed is similar. The front bezel is not shown for
clarity.
OL-1237-01
Improperly grounded equipment, particularly equipment racks and power grounds
Fluctuating voltage, which can result from excessive power drains caused by other equipment (such
as air conditioning units)
Cable corrosion or defective power panels, circuit breakers or fuses, or cable connections
Undersized power cables or excessive power cable lengths
Excessive power demand on backup power systems or batteries when alternate power sources
are used
shows the fan assembly module front panel and its LED indicators.
Fan Assembly Module
CIS CO
100 00
CIS CO
100 00
shows the air circulation pattern of the Cisco uBR10012 router when two DC PEMs are
Cisco uBR10012 Universal Broadband Router Troubleshooting Guide
Fan Assembly Module Faults
2-7
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