Table 1: Temperature requirements
Temperature Range
Operating temperature 0°C to 45°C (32°F to 113°F)
Storage temperature –40°C to +70°C (–40°F to +158°F)
For more environmental information, see Environmental, safety, and electrical information.
Humidity
Maintain the humidity in your equipment room in the acceptable range, as described below.
• Lasting high relative humidity can cause poor insulation, electricity leakage, mechanical property change
of materials, and metal corrosion.
• Lasting low relative humidity can cause washer contraction and ESD, and cause problems such as loose
mounting screws and circuit failure.
Table 2: Humidity requirements
Humidity Range
Operating humidity 15% to 95% at 45C (104F), noncondensing
Storage humidity 15% to 95% at 65C (149F), noncondensing
Cleanliness
Dust buildup on the chassis might result in electrostatic adsorption, which causes poor contact of metal
components and contact points. In the worst case, electrostatic adsorption can cause communication
failure.
Table 3: Dust concentration limit in the equipment room
Substance Concentration limit (particles/m3)
Dust particles ≤ 3 x 104 (No visible dust on desk in three
days)
NOTE: Dust particle diameter ≥ 5 μm
The equipment room must also meet limits on salts, acids, and suldes to eliminate corrosion and
premature aging of components, as shown below.
Table 4: Harmful gas limits in the equipment room
Gas Max. (mg/m3)
SO
2
0.2
H
2
S 0.006
NH
3
0.05
Cl2 0.01
Chapter 3 Site preparation 15
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