Chapter 5 Maintaining the Cisco Global Site Selector 4490
Maintaining Your Site Environment
Adequate ventilation is particularly important at high altitudes. System performance may not be optimum when the system is operating at high temperatures as well as high altitudes.
•Make sure that all slots and openings on the system remain unobstructed, especially the fan vent on the back of the system.
•Clean the system at regular intervals to avoid any buildup of dust and debris, which can cause a system to overheat.
•If the system has been exposed to abnormally cold temperatures, allow a
Humidity
Each system 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 system equipment. However, if a system is located in an unusually humid location, a dehumidifier can be used to maintain the humidity within an acceptable range.
Altitude
Operating a system 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.
Each system is rated to operate at a maximum altitude of 6500 feet (2000 meters) and can be stored at a maximum altitude of 15,000 feet (4570 meters).
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