Quidway AR 28 Series Routers Installation Manual.pdf - Index of

Installation ManualQuidway AR 28 Series RoutersChapter 3 Installation PreparationTable 3-2 Limitation on dust content in equipment roomMechanical active material Unit ContentDust particleNote: Dust particle Diameter ≥ 5µmparticle/m³≤3 x 104(No visible dust on desk in three days)Besides the dust specifications, the equipment room of the Router should also meet therigorous requirements for the content of salt, acid and sulfide. These harmful gasescould accelerate the metal erosion and aging process of some parts. The specific limitsof these harmful gases are given in the following table.Table 3-3 Harmful gas limits in an equipment roomGasMax. (mg/m3)SO2 0.2H2S 0.006NH3 0.05Cl2 0.013.1.3 Requirements on Electrostatic Discharge PreventionAlthough many antistatic considerations have been given to AR 28 Series, damage tothe router’s circuit or even the whole equipment may still happen when the staticelectricity exceeds the tolerance threshold.In the communication network to which the routers are connected, static inductionmainly comes from:• External electric fields such as outdoor high voltage power line or thunder.• Internal environment like flooring materials or the whole equipment structure.Thus, the following should be considered to safeguard the equipment against the ESD:• Make sure that the equipment and the floor are well grounded.• Make sure that dust-proof measures are taken.• Maintain an appropriate humidity and temperature.• Wear an ESD-preventive wrist strap and uniform when contacting the circuitboard.• Place the uninstalled circuit board on the antistatic workbench, with its faceupward, or put it into the static shielding bag.3-2