H3C MSR 30-16, Руководство по установке

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24 C
HAPTER
2: I
NSTALLATION
P
REPARATIONS
Requirements on
Electrostatic Discharge
Prevention
Although many antistatic considerations have been given to H3C MSR 30 Series
Routers, damage to the router’s circuit or even 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 two aspects: external electric fields such as outdoor
high voltage power line or thunder and 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.
■
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 uninstalled circuit board on the antistatic workbench, with its face
upward, or put it into the static shielding bag.
■
When observing or removing the uninstalled circuit board, please touch the
edge of the circuit board, and avoid contacting the devices on it.
Requirements on
Electromagnetic
Environments
The interference sources, no matter where they come from, affect the routers with
capacitance coupling, inductance coupling, radiation of electromagnetic wave,
common impedance (including the grounding system) or conducting line (power
line, signal line and transmission line etc.). So the following should be considered:
■
Take effective measures to prevent the power system from being interfered
with by the power grid system.
■
Use an earthing system or lightning protection grounding different from that
for the power supply equipment and keep them as far as possible.
■
Keep the router far away from the radio launcher, radar launcher, and
high-frequency devices working in high current.
■
Use electromagnetic shielding when necessary.
Requirements on
Preventing Lightning
Although many measures have been taken to protect H3C MSR 30 Series from
lightning, if the lightning intensity exceeds a certain range, damage to the router
may still happen. To protect the router from lightning better, the following should
be considered:
■
Ensure the PGND wire of the chassis is well grounded.
■
Ensure the ground point of the socket of AC power supply is well grounded.
Table 18 Harmful limits in equipment room
Gas Max (mg/m3)
SO
2
0.2
H
2
S 0.006
NH
3
0.05
CI
2
0.01