Esd-Preventive Requirements; Anti-Interference Requirements; Lightning Protection Requirements - Huawei Quidway R2600 Series Installation Manual

Installation Manual
Quidway R2600/3600 Series Modular Routers
Table 3-3 Value limits for harmful gas contents in equipment room

3.2.3 ESD-Preventive Requirements

Although many antistatic considerations have been given to R2600/3600 series,
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:
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 static
damage:
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 circuit
board.
Place the uninstalled circuit board on the antistatic workbench, with its face
upward, or put it into the electromagnetic shield bag.
When observing or removing the uninstalled circuit board, please touch the edge
of the circuit board, and avoid contacting the devices on it.

3.2.4 Anti-interference Requirements

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.
Separate the working ground of the router from the grounding device of the power
supply equipment or anti-lightning grounding device as far as possible.
Keep the router far away from the radio launcher, radar launcher, and high-
frequency devices working in high currents.
Use electromagnetic shielding when necessary.

3.2.5 Lightning Protection Requirements

Although many measures have been taken to protect R2600/3600 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:
Gas
SO
2
H S
2
NO
2
NH
3
Cl
2
Average (mg/m 3 )
0.2
0
0.04
0.05
0.01
3-3
Chapter 3
Installation Preparations
Max. (mg/m 3 )
1.5
0.03
0.15
0.15
0.3