5
Figure1-3 Airflow through the
F1000-AI-20/F1000-AI-30/F1000-AI-50/F1000-AI-60/F1000-AI-70/F1000-AI-80/F1000-AI-90
firewall chassis
ESD prevention
To prevent electrostatic discharge (ESD), follow these guidelines:
•
Make sure the firewall, the workbench, and the rack are reliably grounded.
•
Take dust-proof measures for the equipment room. For more information, see "
•
Maintain the humidity and temperature at an acceptable level. For more information, see
"
•
Put the removed interface modules away on an ESD workbench, with the PCB upward, or put
them in ESD bags for future use.
•
Always wear ESD clothing, ESD gloves, and an ESD wrist strap.
EMI
All electromagnetic interference (EMI) sources, from outside or inside of the firewall and application
system, adversely affect the firewall in the following ways:
•
A conduction pattern of capacitance coupling.
•
Inductance coupling.
•
Electromagnetic wave radiation.
•
Common impedance (including the grounding system) coupling.
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.
•
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.
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.
