Cisco 4490 - Manual (Page 69)

C H A P T E R
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Cisco Global Site Selector 4490 Hardware Installation Guide
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Maintaining the Cisco Global Site
Selector 4490
Proper use of preventive maintenance procedures can keep the Cisco Global Site
Selector 4490 in top operating condition and minimize the need for costly,
time-consuming service procedures. This chapter contains maintenance
procedures that you should perform regularly.
This chapter includes the following major sections:
• Maintaining Your Site Environment
• Using Power Protection Devices
Maintaining Your Site Environment
An exhaust fan in the power supply cools the power supply and system by drawing
air in through various openings in the system and blowing it out the back.
However, the fan also draws dust and other particles into the system, causing
contaminant buildup, which results in an increase in the system’s internal
temperature and interferes with the operation of various system components.
To avoid these conditions, we recommend keeping your work environment clean
to reduce the amount of dust and dirt around the system, thereby reducing the
amount of contaminants drawn into the system by the power supply fan.