2
Examining the installation site
The routers can only be used indoors. To make sure the router operates correctly and to prolong its
service lifetime, the installation site must meet the following requirements.
Temperature and humidity
You must maintain the temperature and humidity in the equipment room at an acceptable level.
•
Lasting high relative humidity tends to cause poor insulation, electricity creepage, mechanical
property change of materials, and corrosion of metal parts.
•
Lasting low relative humidity is likely to result in loose screws due to washer contraction, and
even ESD, which causes the circuits to fail.
•
A high temperature is the most undesirable condition, because it accelerates the aging of
insulation materials and significantly lowers reliability and service life of the router.
For the temperature and humidity requirements of the MSR2000 router, see
Table 2 Temperature and humidity requirements
Temperature Humidity
0°C to 45°C (32°F to 113°F)
5% to 90% (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 desk in three days.)
NOTE:
Dust particle diameter
≥
5 µm
The equipment room must also meet strict limits on salts, acids, and sulfides to eliminate corrosion
and premature aging of components, as shown in
.
Table 4 Harmful gas limits in the equipment room
Gas Max.
(mg/m
3
)
SO
2
0.2
H
2
S 0.006
NH
3
0.05
Cl
2
0.01
Cooling system
The MSR2000 router adopts left to right airflow for heat dissipation.
