H3C Technologies H3C MSR 20-1X - Manual (Page 20)

13
Installation Preparations
Requirements on Environment
MSR 20-1X routers are designed for indoor application. To ensure the normal operation and prolong
their service life, the installation site must meet the requirements mentioned in the following sections.
Requirements on Temperature and Humidity
To ensure the normal operation and prolong their service life, the temperature and humidity in the
equipment room shall maintain at a certain level. A long-term high relative humidity will quite likely result
in poor insulation performance, electric leakage, mechanical property change, and corrosion, while a
low relative humidity will result in looseness of fastening screws owing to shrinkage of insulation washers,
or electrostatic discharge (ESD), which may damage the CMOS circuit on the router. A high temperature
will speed up the aging of insulation materials, and thus will greatly lower the reliability of the router and
shorten the service life.
Table 12 lists the requirements on the temperature and humidity for MSR 20-1X routers.
Table 12 Temperature and humidity requirements in the equipment room
Temperature Relative Humidity
0°C to 40°C (32°F to 104°F) 5% to 90% (noncondensing)
Requirements on Cleanness
Dust is harmful to the safe operation of the router. Dust on the chassis may result in static absorption,
causing poor contact between metal connectors or joints, which may not only shorten the service life of
the router, but also bring about communication failures. Especially under the condition of a low indoor
humidity, dust is easier to be absorbed.
Table 13 lists the requirements on the dust concentration and diameters in the equipment room.
Table 13 Limitation on dust concentration and diameters in the equipment room
Diameter (μm) 0.5 1 3 5
Concentration
(particle/m³)
1.4 × 10 7 7 × 10 5 2.4 × 10 5 1.3 × 10 5
Besides, the contents of salt, acid, and sulfide in equipment room shall be strictly restricted. Harmful
gases will accelerate the corrosion of metal parts and the aging of some parts. Table 14 lists the
concentration limit of SO
2
, H
2
S, NH
3
and CI
2
in the equipment room.
Table 14 Concentration limit of some harmful gases in equipment room
Gas Concentration limit (mg/m 3 )
SO
2
0.2
H
2
S 0.006