1-4
Table1-3 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
Table1-4 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
NO
2
0.04
Cl
2
0.01
Cooling
The router uses passive cooling. For better heat dissipation and cooling of the router, follow these
guidelines:
•
Keep the air vents unblocked. Maintain a minimum clearance of 100 mm (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.
