Emi Prevention; Lightning Protection; Rack Requirements - H3C ICG2000 Installation Manual

EMI prevention

All electromagnetic interference (EMI) sources, from outside or inside of the device and application
system, adversely affect the device 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, use the following guidelines:
•
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 device far away from radio transmitting stations, radar stations, and high-frequency
devices.
•
Use electromagnetic shielding, for example, shielded interface cables, when necessary.
•
To prevent signal ports from getting damaged by overvoltage or overcurrent caused by
lightning strikes, route interface cables only indoors.

Lightning protection

To enhance lightning protection for the device, follow these guidelines:
•
Make sure the grounding cable of the chassis is connected to earth ground reliably.
•
Make sure the AC power outlet is reliably grounded.
•
Install a lightning protector at the power input end.
•
Install a lighting protector at the input end of signal cables routed from outdoors, for example,
E1/T1 cable.

Rack requirements

To install the device in a rack, make sure the rack meets the following requirements:
•
The rack has a good ventilation system.
•
The rack is sturdy and can support the device and its accessories.
•
The rack has a size that can accommodate the device.
•
Enough clearances are reserved at the two sides of the device for heat dissipation.
•
A minimum of 0.8 m (2.62 ft) of clearance is reserved between the rack and walls or other
devices for heat dissipation and maintenance.
•
The headroom in the equipment room is not less than 3 m (9.84 ft).
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