5
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 firewall far away from radio transmitting stations, radar stations, and high-frequency
devices.
•
Use electromagnetic shielding, for example, shielded interface cables, when necessary.
Lightning protection
To protect the firewall from lightning better, follow these guidelines:
•
Make sure the grounding cable of the chassis is reliably grounded.
•
Make sure the grounding terminal of the AC power receptacle is reliably grounded.
•
Install a lightning arrester at the input end of the power module to enhance the lightning
protection capability of the power module.
•
To prevent signal ports from getting damaged by overvoltage or overcurrent caused by lightning
strikes, route interface cables only indoors. If part of the network cable of an Ethernet port must
be routed outdoors, connect a lightning arrester to the cable before you plug the cable into the
port.
Power supply
Verify that the power system at the installation site meets the firewall power requirements, including
the power input method and rated input voltage. For more information, see "Appendix A Chassis
views and technical specifications."
Installation tools
No installation tools are provided with the firewall. Prepare them yourself as required.
Table1-4 Installation tools
Flat-head
screwdriver
Phillips screwdriver
Needle-nose pliers
Marker
Rubber hammer
Diagonal pliers
ESD wrist strap
Wire stripper
Crimping tool
Hammer drill
