3
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 the tabletop in three days)
NOTE:
Dust 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 .
Table 4
Harmful gas limits in an equipment room
Gas Maximum concentration (mg/m
3
)
SO
2
0.2
H
2
S 0.006
NH
3
0.05
Cl
2
0.01
Cooling
• Maintain a minimum clearance of 10 cm (3.94 in) around the air vents.
• Make sure the installation site has a good ventilation system.
EMI
All electromagnetic interference (EMI) sources, from outside or inside of the router and application
system, adversely affect the router in the following ways:
• A conduction pattern of capacitance coupling.
• Inductance coupling.
• Electromagnetic wave radiation.
• Common impedance (including the grounding system) coupling.
To prevent EMI, perform the following tasks:
• If AC power is used, use a single-phase three-wire power receptacle with protection earth (PE)
to filter interference from the power grid.
• Keep the router far away from radio transmitting stations, radar stations, and high-frequency
devices.
• Use electromagnetic shielding, for example, shielded interface cables, when necessary.
Lightning protection
To protect the router from lightning, follow these guidelines:
• Make sure the router is reliably grounded by using a grounding cable.
• Make sure the AC power receptacle is reliably grounded.
• Install a lightning protector at each power input end.
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