H3C S5500-28C-EI Installation Manual

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H3C S5500-28C-EI Installation Manual Manual pdf 39 page image

Installation ManualH3C S5500-EI Series Ethernet Switches Chapter 2 Installation Preparations2-2accelerates the aging of insulation materials and thus significantly lowers reliability andservice life of the switch.For the temperature and humidity requirements of different models, refer to section 1.8“System Specifications of the S5500-EI Series” on page 错误！未定义书签。.2.2.2 CleannessDust is a hazard to the operating safety of your device. The dust accumulated on thechassis can be adsorbed by static electricity and result in poor contact of metalconnectors 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 servicelife of your device but also cause communications failures. The following table lists thedust 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 airthat can accelerate the corrosion and aging of metals, such as chloride, acid, andsulfide in the equipment room. The equipment room must be protected againstingression of harmful gases such as SO2, 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 0.012.2.3 Electromagnetic SusceptibilityThe operation of your switch can be affected by external interferences, such asconducted emission by capacitance coupling, inductance coupling, electromagneticwave radiation, and common impedance (including the grounding system) coupling,and leads (power cables, signaling cables and output wires). To eliminate theinterferences, pay attention to the following: