Cisco 6509 Installation Guide - Page 83
Temperature, Humidity, Altitude - size
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Chapter 2 Preparing for Installation Site Requirements 6-2 Temperature Temperature extremes can cause a system to operate at reduced efficiency and cause a variety of problems, including premature aging and failure of chips, and failure of mechanical devices. Extreme temperature fluctuations can cause chips to become loose in their sockets. Ensure that the system is operating in an environment no colder than 50°F (10°C) or hotter than 95°F (35°C). Ensure that the chassis has adequate ventilation. Do not place the chassis within a closed-in wall unit or on top of cloth, which can act as insulation. Do not place it where it will receive direct sunlight, particularly in the afternoon. Do not place it next to a heat source of any kind, including heating vents during winter. Adequate ventilation is particularly important at high altitudes. Make sure that all slots and openings on the system remain unobstructed, especially the fan vent on the chassis. Clean the installation site at regular intervals to avoid buildup of dust and debris, which can cause a system to overheat. If the system 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 can damage internal components. Note The Catalyst 6500 series switches are equipped with internal air temperature sensors that are triggered at 40°C (104°F) generating a minor alarm and at 55°C (131°F) generating a major alarm. 6-3 Humidity Altitude High-humidity conditions can cause moisture migration and penetration into the system. 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 system can result in electrical shorts, which can cause serious damage to the system. Each system is rated to operate at 8 to 80 percent relative humidity, with a humidity gradation of 10 percent per hour. In storage, a system can withstand from 5 to 95 percent relative humidity. 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. 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 altitudes from -50 to 6500 feet (-16 to 1981 meters) and can be stored at altitudes of -50 to 35,000 feet (-16 to 10,668 meters). OL-5781-04 Catalyst 6500 Series Switches Installation Guide 2-3
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