H3C S7503 S7506 AND S7506R SWITCH Installation Manual

Also see for S7502: Operation manual Installation manual Installation manual Installation manual Installation manual

Contents

Installation ManualH3C S7502 Ethernet Switch Chapter 3 Installation Preparations3-4contact between connectors or metal contact points. This happens more frequentlywhen the relative indoor humidity is low, which will not only shorten the service life ofthe switch, but also cause communication failures.The required specifications on dust density and particle diameter in an equipment roomare shown in the following table.Table 3-2 Required specifications on dust density in an equipment roomMechanical activematerial Concentration limit (particles/m³)Dust particle ≤3 x 10 4 (No visible dust on desk over three days)Note: Dust particle diameter ≥ 5μmExcept the requirements on dust, rigorous requirements on ingredient of salts, acidsand sulfides of air in an equipment room are also set. These harmful gases will speedup the metal corrosion and the aging processes of certain parts. The equipment roomshould be protected from the invasion of harmful gases such as SO2, H 2S, NO2, NH 3and Cl2, the value limits of which are shown in Table 3-2:Table 3-3 Limits on harmful gas ingredients in an equipment roomGas Max. (mg/m3)SO 2 0.2H 2S 0.006NH 3 0.05Cl2 0.013.2.3 Anti-static RequirementsAny possible interference sources, no matter outside or inside the system, affect theswitch in use may in a way of capacitance coupling, inductance coupling, radiation ofelectromagnetic wave, common impedance (including the grounding system) couplingor conducting line (power line, signaling line and transmission line etc.).Therefore, thefollowing should be considered:z Adopt effective measures to protect the power supply system against the powergrid interference.z Separate the working ground of the switch from the ground device of the powersupply equipment or lightning-protection ground device as far as possible.z Keep the switch far away from the radio launcher, radar launcher, andhigh-frequency devices working in high current.If necessary, adopt electromagnetic shield.