easily occur in dry weathers, harming the internal circuitry of the router. High temperature will speed the aging of
insulation materials, lowering the router's reliability and shorten its service life.
The following are Ruijie RSR10-02E series routers' Requirements for the temperate and humidity requirements:
Temperature: 0ºC to 45ºC
Relative humidity: 10%–95% RH
The ambient temperature and humidity refer to the values measured at the place 1.5 m above the floor and
0.4 m in the front of the router rack without protective boards.
The temperature and humidity requirements may be different for different products. For details, see
descriptions about the characteristic parameters for each product.
Cleanness Requirements
Dust poses a serious threat to device operation. Dust that falls onto the surface of the device can be absorbed onto metal
contact points by static electricity, resulting in poor contact. Electrostatic absorption of dust occurs more easily when the
relative humidity is low, which may shorten the useful life of the device and cause communication failures.
The following table describes Ruijie routers' requirements for the dust content and granularity in the equipment room:
Maximum diameter (μm)
0.5
1
3
5
Maximum concentration
(Particles/m
3
)
1.4 × 10
7
7 × 10
5
2.4 × 10
5
1.3 × 10
5
Besides, the content of salts, acids and sulfides in the air are also strictly limited for the equipment room. These
substances can accelerate metal corrosion and aging of some parts. The following table describes the limit of some
hazardous gases such as SO
2
, H
2
S, NO
2
and Cl
2
in the equipment room.
Gas
Average (mg/m
3
)
Maximum (mg/m
3
)
SO
2
0.2
1.5
H
2
S
0
0.03
NO
2
0.04
0.15
NH
3
0.05
0.15
Cl
2
0.01
0.3
Anti-static Requirements
The router circuitry is designed with anti-static protection, but excessive static electricity may still damage router circuit
boards. The static electricity of the network connected with the routers comes largely from the following sources:
Outdoor electric field produced by the high-voltage supply cable and lightning.
Indoor systems such as the indoor floor and the entire structure.
Therefore, the following requirements must be met:
