H3C Technologies H3C MSR 20-2X[40] - Manual (Page 17)

10
Installation Preparations
Requirements on Environment
The MSR 20 routers are designed for indoor applications. To ensure the normal operation and prolong
their service life, the following requirements for installation site must be met.
Requirements on Temperature/Humidity
To ensure the normal operation and prolong their service life, certain requirements on temperature and
humidity in the equipment room shall be met. If the relative humidity is too high, the insulation materials
in it will deteriorate easily or even lead to electric leakage. Sometimes this will result in change to the
mechanical performance of the materials and rusting of the metal components. If the relative humidity is
too low, the fastening screw will become loosen due to shrinkage of the isolation spacer. In an
environment with dry climate, static electricity may be produced, putting the CMOS of the router to risk.
High temperature is of the greatest risk: for it will significantly degrade the router’s reliability, speed up
aging process of the insulating materials, and shorten the service life of the router.
The requirements on the temperature and humidity for MSR 20 are shown in the following table:
Table 9 Temperature/humidity requirements in the equipment room
Temperature Relative humidity
0°C to 40°C (32°F to 104°F) 5% to 90% (non-condensing)
Requirements on Cleanness
Dust is harmful to the safe operation of the Router. Dust on the chassis may result in static absorption, thus
causing poor contact of the metal connection components or points. Especially under the condition of
low indoor humidity, dust is easier to be absorbed.
The requirements on the dust concentration and diameter are shown in the following table:
Table 10 Limitation on dust content in equipment room
Diameter (μm) 0.5 1 3 5
Concentration
(particle/m³)
1.4 × 107 7 × 105 2.4 × 105 1.3 × 105
Besides the dust specifications, the equipment room of the Router should also meet the rigorous
requirements for the content of salt, acid and sulfide. These harmful gases could accelerate the metal
erosion and aging process of some parts. The specific limits of these harmful gases as SO
2
, H
2
S, NO
2
,
NH
3
and CI
2
are given in the following table.
Table 11 Harmful limits in equipment room
Gas Max (mg/m 3 )
SO2 0.2