H3c-technologies H3C SecPath F5000-A5 Firewall User Manual download pdf (Page 16)

EMI

The EMI might be coupled from the source to the firewall through the following coupling mechanisms:

• Capacitive coupling

• Inductive coupling

• Radiative coupling

• Common impedance coupling

• Conductive coupling

To prevent EMI, take the following actions:

• Take measures against interference from the power grid.

• 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.

Lightning protection

To protect the firewall from lightning better, do as follows:

• Make sure the chassis is correctly grounded.

• Make sure the grounding terminal of the AC power receptacle is correctly grounded.

• 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

cabinet has good ventilation system.

• Install the chassis on a rack that has rack shelves.

• The rack is sturdy enough to support the chassis and the accessories.

• Reserve at least 0.8 m (2.62 ft) of clearance between the rack and walls or other devices.

• The equipment room is at least 3 m (9.84 ft) high.

• Rack dimensions are sufficient for the chassis.

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 120 121

No comments

H3c-technologies H3C SecPath F5000-A5 Firewall User Manual Page 16