H3C MSR 50-40 Installation Manual

Also see for MSR 50-40: User manual

Contents

H3C MSR 50-40 Installation Manual Manual pdf 25 page image

17Table 14 Limitation on harmful gases in equipment roomGas Max. (mg/m 3 )SO2 0.2H2 S 0.006NH3 0.05Cl2 0.01Requirements on Electrostatic Discharge PreventionAlthough many antistatic considerations have been given to MSR 50, damage to the router’s circuit oreven the whole equipment may still happen when the static electricity exceeds the tolerance threshold.In the communication network to which the routers are connected, static induction mainly comes from twoaspects: external electric fields such as outdoor high voltage power line or thunder and internalenvironment like flooring materials or the whole equipment structure. Thus, the following should beconsidered to safeguard the equipment against the ESD.• Make sure that the equipment and the floor are well grounded.• The equipment room is dust-proof.• Maintain an appropriate humidity and temperature.• Wear an ESD-preventive wrist strap and uniform when contacting the circuit board.• Place the removed circuit board on the antistatic workbench, with its face upward, or put it into thestatic shielding bag.• When observing or moving the removed circuit board, please touch the edge of the circuit board,and avoid contacting the devices on it.Requirements on Electromagnetic EnvironmentsThe interference sources, no matter where they come from, affect the routers with capacitance coupling,inductance coupling, radiation of electromagnetic wave, common impedance (including the groundingsystem) or conducting line (power line, signal line and transmission line etc.). So the following should beconsidered:• Take effective measures to prevent the power system from being interfered with by the power gridsystem.• Use an earthing system or lightning protection grounding different from that for the power supplyequipment and keep them as far as possible.• Keep the router far away from the radio launcher, radar launcher, and high-frequency devicesworking in high current.• Use electromagnetic shielding when necessary.Requirements on Preventing LightningAlthough many measures have been taken to protect MSR 50 from lightning, if the lightning intensityexceeds a certain range, damage to the router may still happen. To protect the router from lightningbetter, the following should be considered:• Ensure the PGND wire of the chassis is well grounded.