Chapter 2 PEM Faults and Fan Assembly Failures

Fan Assembly Module Faults

Check the site for:

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

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 2-5shows the fan assembly module front panel and its LED indicators.

Figure 2-5 Fan Assembly Module

Fan assembly

CISCO

 

 

10000

 

CISCO

 

 

10000

A

 

 

UX

 

 

 

 

AUX

AC

 

 

ETIVITY

AC

THE

 

RNE

TIVITY

LINK

T

ETH

 

 

LINERN

 

 

K ET

FANS OK

SINGLE FAN FAILURE

MULTIPLE FAN FAILURE

 

 

56479

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 2-6shows the air circulation pattern of the Cisco uBR10012 router when two DC PEMs are installed. The air flow when two AC PEMs are installed is similar. The front bezel is not shown for clarity.

Cisco uBR10012 Universal Broadband Router Troubleshooting Guide

 

OL-1237-01

2-7

 

 

 

Page 25
Image 25
Cisco Systems UBR10012 manual Fan Assembly Module Faults