3Com 3C13701 Installation Manual

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3 INSTALLATION PREPARATIONRequirements onEnvironment3Com 5000 Routers must be used indoors. To ensure the normal operation and prolongtheir service life, the following requirements for installation site must be met.Requirements onTemperature/HumidityCertain requirements on temperature and humidity in the equipment room shall be met.If the relative humidity is too high, the insulation materials in it will deteriorate easily oreven lead to electric leakage. Sometimes this will result in change to the mechanicalperformance of the materials and rusting of the metal components. If the relativehumidity is too low, the fastening screw will become loosen due to shrinkage of theisolation spacer. In an environment with dry climate, static electricity may be produced,putting the CMOS of the router to risk. High temperature is of the greatest risk: for it willsignificantly degrade the router’s reliability, speed up aging process of the insulatingmaterials, and shorten the service life of the router. The requirements on the temperatureand humidity for 3Com 5000 Routers are shown in Table 8:Requirements onCleannessDust is harmful to the safe operation of the Router. Dust on the chassis may result instatic absorption, thus causing poor contact of the metal connection components orpoints. Especially under the condition of low indoor humidity, dust is easier to beabsorbed, which not only shortens the operational lifetime of the equipment, but alsoresults in communication failure.There should not be explosive, conductive, magnetic and corrosive dust in the equipmentroom where 3Com 5000 Routers are located, and the dust concentration should meetthe following requirements:Table 8 Humidity requirements in the equipment roomTemperature Relative humidity0°C to 40°C 5% to 90%, non-condensingTable 9 Limitation on dust content in equipment roomDiameter (μm) 0.5 1 3 5Concentration (particle/m³) 1.4 × 107 7 × 105 2.4 × 105 1.3 × 105