Emi; Lightning Protection; Rack Installation - H3C SecPath F5000-A5 Installation Manual

EMI

The EMI might be coupled from the source to the firewall through the following coupling mechanisms:
Capacitive coupling
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Inductive coupling
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Radiative coupling
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• Common impedance coupling
Conductive coupling
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To prevent EMI, take the following actions:
Take measures against interference from the power grid.
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• Do not use the firewall together with the grounding equipment or lightning-prevention equipment of
power equipment, and keep the firewall far away from them.
• Keep the firewall far away from high-power radio launchers, radars, and equipment with high
frequency or high current to make sure the EMI levels do not exceed the compliant range.
Use electromagnetic shielding when necessary.
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Lightning protection

To protect the firewall from lightning better, do as follows:
Make sure the chassis is correctly grounded.
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Make sure the grounding terminal of the AC power receptacle is correctly grounded.
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• Install a lightning protector at the input end of the power supply to enhance lightning protection
capability.
• Install a surge lightning protector at the input end of outdoor signal lines to which interface modules
of the firewall are connected to enhance the lightning protection capability.

Rack installation

Install the chassis in an open rack. To install the chassis in an enclosed cabinet, make sure the
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cabinet has good ventilation system.
Install the chassis on a rack that has rack shelves.
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The rack is sturdy enough to support the chassis and the accessories.
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Reserve at least 0.8 m (2.62 ft) of clearance between the rack and walls or other devices.
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• The equipment room is at least 3 m (9.84 ft) high.
• Rack dimensions are sufficient for the chassis.
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