Installation Manual
H3C VG 31-08 Voice Gateway
Chapter 2 Installation Preparations
2-4
2.1.4 Electromagnetic Environment
Any possible interference source, whether from inside or outside
the device, impacts the VG 31-08 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:
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Take effective measures against the interference caused by
the electrical power grid.
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Use a grounding system or lightning protection grounding
different from that for the power supply system and keep
them as far as possible.
z
Keep the device far from radio transmitting station, radar
station, and high-frequency high-current devices.
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Use electromagnetic shielding when necessary.
2.1.5 Lightning Protection
Although the VG 31-08 is designed to be lightning resistant,
excessive lightning interference can damage your device. To protect
your device against lightning,
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Ensure the chassis is connected to earth ground.
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Ensure the earth point of the power socket is well connected
to earth ground.
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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/Workbench/Tabletop
When installing the VG 31-08, make sure that: