Installation Manual
H3C SecPath F100-A Firewall
Chapter 2 Installation Preparations
2-2
Besides, the equipment room should meet the rigorous limits on salt, acid and sulfide to
eliminate corrosion and premature aging of some parts, as shown in the Table 2-3.
Table 2-3
Harmful gas limits in the equipment room
Gas
Max content (mg/m3)
SO
2
0.2
H
2
S 0.006
NH
3
0.05
Cl
2
0.01
2.1.3 ESD Prevention
By design, the H3C SecPath F100-A firewall is ESD preventative, but excessive
buildup of static electricity can still damage the card circuitry and even the entire device.
On the communication network connected to the firewall, static electricity is primarily
introduced from the outside electrical fields, such as the outdoor high-voltage power
cabling and lightning, and from the inside system, such as indoor environment, floor
material and the equipment frame. To avoid damage, ensure that:
z
The device is well grounded.
z
The equipment room is dust-proof.
z
Maintain adequate temperature and humidity.
z
Wear an ESD-preventive wrist strap and clothes when contacting the circuit board.
z
Place the removed circuit board upward on the ESD-preventive workbench, or into
a static shielded bag.
z
Hold the circuit board by its edge when observing or moving it, avoiding direct
contact with the elements on it.
2.1.4 Electromagnetic Compatibility
All interference sources, from the outside or from the inside of the device/application
system, adversely affect the device in the conduction patterns of capacitance coupling,
inductance coupling, electromagnetic wave radiation, and common impedance
(including grounding system) coupling. To prevent the interference, do the following:
z
Take effective measures against interference from the power grid.
z
Use a separate grounding system or lightning protection grounding from that for
the power supply equipment and keep them as far as possible.
z
Keep the device far away from strong power wireless launchers, radar launchers
and high frequency and high-current equipment.
z
Use electromagnetic shielding when necessary.
