5
Lasting low relative humidity can cause washer contraction and ESD and bring problems
including loose captive screws and circuit failure.
High temperature can accelerate the aging of insulation materials and significantly lower the
reliability and lifespan of the router.
Table 2
Temperature/humidity requirements in the equipment room
Temperature Relative
humidity
0°C to 45°C (32°F to 113°F)
5% to 95%, noncondensing
Cleanliness
Dust buildup on the chassis might result in electrostatic adsorption, which causes poor contact of
metal components and contact points, especially when indoor relative humidity is low. In the worst
case, electrostatic adsorption can cause communication failure.
Table 3
Dust concentration limit in the equipment room
Substance
Concentration limit (particles/m
3
)
Dust particles
≤
3 x 10
4
(No visible dust on the tabletop in three days)
NOTE:
Dust diameter
≥
5
μ
m
The equipment room must also meet strict limits on salts, acids, and sulfides to eliminate corrosion and
premature aging of components, as shown in
Error! Reference source not found.
.
Table 4
Harmful gas limits in an equipment room
Gas
Maximum concentration (mg/m
3
)
SO
2
0.2
H
2
S 0.006
NH
3
0.05
Cl
2
0.01
Cooling
Maintain a minimum clearance of 10 cm (3.94 in) around the air vents.
Make sure the installation site has a good ventilation system.
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.
