H3C CR16000-F, Руководство по установке

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3
Table 2 Humidity requirements
Humidity Range
Operating humidity 10% RH to 95% RH, noncondensing
Storage humidity 5% RH to 95% RH, noncondensing
Cleanliness
Dust buildup on the chassis might result in electrostatic adsorption, which causes poor contact of
metal components and contact points. In the worst case, electrostatic adsorption can cause
communication failure.
Table 3 Dust concentration limits in the equipment room
Substance Particle diameter Concentration limit
Dust particles
≥ 0.5 µm ≤ 1.8 × 10 7
particles/m
3
Corrosive gases can accelerate corrosion and aging of components. Make sure the corrosive gases
in the equipment room do not exceed the concentration limits as shown in
Table 4 .
Table 4 Corrosive gas concentration limits in the equipment room
Gas Average concentration (mg/m
3
) Maximum concentration (mg/m
3
)
SO
2
0.3 1.0
H
2
S 0.1 0.5
Cl
2
0.1 0.3
HCI 0.1 0.5
HF 0.01 0.03
NH
3
1.0 3.0
O
3
0.05 0.1
NO
X
0.5 1.0
EMI
All electromagnetic interference (EMI) sources, from outside or inside of the router and application
system, adversely affect the router in the following ways:
•
A conduction pattern of capacitance coupling.
•
Inductance coupling.
•
Electromagnetic wave radiation.
•
Common impedance (including the grounding system) coupling.
To prevent EMI, use the following guidelines:
•
If AC power is used, use a single-phase three-wire power receptacle with protection earth (PE)
to filter interference from the power grid.
•
Keep the router far away from radio transmitting stations, radar stations, and high-frequency
devices.
•
Use electromagnetic shielding, for example, shielded interface cables, when necessary.