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Table 1 Temperature requirements
Temperature
Operating temperature
Storage temperature
Humidity requirements
Maintain appropriate humidity in your equipment room, as described in
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
•
electrostatic discharge (ESD), which causes the circuits to fail.
Table 2 Humidity requirements
Humidity
Operating humidity (noncondensing)
Storage humidity (noncondensing)
Cleanness requirements
Maintain appropriate cleanness in your equipment room.
Dust is a hazard to the operating safety of your switch. Dust buildup on the chassis may 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.
The equipment room should meet strict limits on salts, acids and sulfides to eliminate corrosion and
•
premature aging of components, as shown in
Table 3 Dust concentration limit in the equipment room
Substance
Dust particles
IMPORTANT:
Dust particle diameter ≥ 5 μm
Table 4 Harmful gas limits in an equipment room
Gas
SO
2
H
S
2
NH
3
Range
0°C to 45°C (32°F to 113°F)
–40°C to +70°C (–40°F to +158°F)
Range
10% to 95%
5% to 95%
Table 3
shows the dust concentration limit in the equipment room.
Table
Concentration limit (particles/cu m)
≤ 3 x 10
4
(No visible dust on desk in three days)
Max. (mg/m
3
)
0.2
0.006
0.05
3
Table
2.
4.
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Troubleshooting
