Cisco Systems 78-16356-01 manual Humidity, Altitude

Chapter 5 Maintaining Your GSS

Maintaining Your Site Environment

Adequate ventilation is particularly important at high altitudes. GSS performance may not be optimum when operating at high temperatures as well as high altitudes.

•Ensure that all slots and openings on the GSS remain unobstructed, especially the fan vent on the back of the GSS.

•Clean the GSS at regular intervals to avoid any buildup of dust and debris, which can cause it to overheat.

•If the GSS has been exposed to abnormally cold temperatures, allow a 2-hour warm-up period to bring it up to normal operating temperature before turning it on. Failure to do so may cause damage to internal components, particularly the hard disk drive.

Humidity

High-humidity conditions can cause moisture in the GSS. This moisture can cause corrosion of internal components and degradation of properties such as electrical resistance, thermal conductivity, physical strength, and size. Extreme moisture buildup inside the GSS can result in electrical shorts, which can cause serious damage.

Each GSS is rated to operate at 8 to 80 percent relative humidity, with a humidity gradation of 10 percent per hour. Buildings in which climate is controlled by air conditioning in the warmer months and by heat during the colder months usually maintain an acceptable level of humidity for the GSS. However, if a GSS is located in an unusually humid location, use a dehumidifier to maintain the humidity within an acceptable range.

Altitude

Operating a GSS at high altitude (low pressure) reduces the efficiency of forced and convection cooling and can result in electrical problems related to arcing and corona effects. This condition can also cause sealed components with internal pressure, such as electrolytic capacitors, to fail or perform at reduced efficiency.

	Cisco Global Site Selector 4491 Hardware Installation Guide
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