H3C S5820X-28S Installation Manual

Also see for S5820X-28C: Command reference Installation manual Manual

2-2Installation SiteThe S5820X series must be used indoors. You can mount the switch in a rack or on a workbench, butmake sure:z Adequate clearance is reserved at the air inlet/exhaust vents for ventilation.z The rack or workbench has a good ventilation system.z The rack is sturdy enough to support the device and its accessories.z The rack or workbench is well earthed.To ensure normal operation and long service life of your switch, install it in an environment that meetsthe requirements described in the following subsections.Temperature/HumidityYou must maintain a proper temperature and humidity in the equipment room. Long-term high humiditymay lead to bad insulation, electricity leakage, mechanical property changes, and metal corrosion.However, if the relative humidity is too low, captive screws may become loose as the result ofcontraction of insulation washers and static electricity may be produced in a dry environment tojeopardize the circuits on the device. A high temperature is the most undesirable condition, because itaccelerates the aging of insulation materials and thus significantly lowers reliability and service life ofthe switch.For the temperature and humidity requirements of different models, refer to Table 1-1 on page 1-1.CleannessDust is a hazard to the operating safety of your device. The dust accumulated on the chassis can beadsorbed by static electricity and result in poor contact of metal connectors or metal contact points.Especially when the indoor relative humidity is low, electrostatic adsorption is more likely to happen.This can not only shorten the service life of your device but also cause communications failures. Thefollowing table lists the dust concentration limit.Table 2-1 Dust concentration limit in the equipment roomSubstance Concentration limit (particles//m³)Dust ≤ 3 x 10 4 (no visible dust on the tabletop over three days)Note: The dust diameter is greater than or equal to 5 μm.Besides dust, there are rigorous limits on the content of harmful substances in the air that canaccelerate the corrosion and aging of metals, such as chloride, acid, and sulfide in the equipment room.The equipment room must be protected against ingression of harmful gases such as SO 2, H 2S, NH 3,and Cl2. For specific requirements, see the following table.Table 2-2 Harmful gas limits in the equipment roomGas Maximum concentration (mg/m3)SO 2 0.2H 2S 0.006NH 3 0.05Cl2 0.01