4-8
Precautions
Pay attention that the performance of the port lightning arrester may be affected in the following cases:
z
The IN and OUT ends of the port lightning arrester are incorrectly connected. The IN end should be
connected to the external cable while the OUT end should be connected to the Ethernet interface
of the firewall.
z
The port lightning arrester is not well grounded. Make sure that the grounding cable of the arrester
should be as short as possible and be well connected to the grounding screw of the firewall. Check
with a multimeter after connection.
z
When more than one outdoor Ethernet cable are connected to the firewall, you need to install a port
lightning arrester for each outdoor Ethernet cable.
Installing an AC Power Lightning Arrester (Lightning Protection
Busbar) (Optional)
No power lightning arresters are shipped with the firewall.
If an outdoor AC power cable is to be connected to the firewall, you should install a lightning protection
busbar at the AC power input end to protect the device against lightning strokes. You can use cable ties
and screws to fasten the lightning protection busbar on the cabinet, the workbench, or the wall in the
equipment room. With a lightning protection busbar, the AC current flows through the lightning
protection busbar before reaching the device.
Figure 4-9
Power lightning arrester
Grounding and polarity LED (red): When the LED is ON, a
cable connection error occurs (for example, no grounding cable
is connected or the live wire and zero wire are connected
incorrectly. In this case, check the power supply line.
Power switch
Normal operation LED (green): When the
LED is ON, the protection circuit works
normally. Otherwise, the circuit is damaged.
Main electronic circuit board (built-in)
Multi-purpose socket, used
for connecting the power
supply of the router
Automatic overload
protection device, which
can be manually reset
IEC-compliant socket,
connected to the power
supply in the equipment
room through a power
cable
Note that:
1) Make sure that the protection wire (PE) terminal of the power lightning arrester is well grounded
before using it.
