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Installation Manual
H3C VG 21-08 Voice Gateway
2.1.4 Electromagnetic Environment
Any possible interference source, wherever it is from, impacts the
VG 21-08 negatively in the form of capacitive coupling, inductive
coupling, electromagnetic radiation, or common-impedance (including
the grounding system) coupling. To resist the interference, make sure
to:
Take effective measures against the interference caused by
the electrical power grid.
Use a grounding system or lightning protection grounding
different from that for the power supply system and keep
them as far as possible.
Keep the device far from radio transmitting station, radar
station, and high-frequency high-current devices.
Use electromagnetic shielding when necessary.
2.1.5 Lightning Protection
Although the VG 21-08 is designed to be lightning resistant,
excessive lightning interference can damage your device. To protect
your device against lightning.
Ensure the chassis is connected to earth ground.
Ensure the earth point of the power socket is well connected
to earth ground.
Add a lightning arrester to the front end of the power input to
better protect the power supply against lightning strikes.
2.1.6 Checking the Rack
When installing the VG 21-08 in a rack, make sure that:
Chapter 2 Installation Preparations
2-4
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