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• Take dust-proof measures for the equipment room. For more information, see "Cleanliness."
• Maintain the humidity and temperature at an acceptable level. For more information, see
"Temperature and humidity."
• Put the remo
ved 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 when you install or remove a
transceiver module.
No ESD wrist strap is provided with the firewall. Purchase one yourself.
Before you attach an ESD wrist strap, make sure the rack is reliably grounded.
To attach the ESD wrist strap:
1. Wear the wrist strap on your wrist.
2. Lock the wrist strap tight around your wrist to keep good contact with the skin.
3. Secure the wrist strap lock and the alligator clip lock together.
4. Attach the alligator clip to the rack.
Figure 3 Attaching an ESD wrist strap
(1) ESD wrist strap (2) Lock
(3) Alligator clip
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.
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