4-6
Step3
Fasten the grounding screw, which is attached with the OT terminal, into the grounding screw hole with
a screwdriver.
Step4
Connect the other end of the PGND cable to the ground. Generally, the cabinets installed in equipment
rooms are equipped with a ground bar.
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If a grounding bar is available, you can connect the PGND cable of the firewall to the grounding bar
as follows: a) Use a cable stripper to strip off the insulation rubber about 15 mm (0.59 in.) from the
PGND cable. b) Wrap the naked part onto the grounding post of the grounding bar. c) Fix the
PGND cable onto the grounding post with a hex nut.
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If no grounding bar is available, connect the naked part of the PGND cable to the ground directly.
Figure 4-7
Connect the PGND cable to the grounding bar
(1) A hex nut
(2) PGND cable
(3) Naked part of the PGND cable
(4) Grounding post
(5) Grounding bar
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The resistance between the firewall chassis and the ground must be less than 5 ohms.
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Use the PGND cable provided with the firewall to connect the grounding bar in the equipment room.
Otherwise, the firewall may not be effectively grounded, which easily causes damage to the
firewall.
Installing a Port Lightning Arrester (Optional)
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Port lightning arresters are applicable to only 10/100 Mbps RJ-45 electrical Ethernet interfaces.
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No port lightning arresters are shipped with the firewall.
Before connecting an outdoor Ethernet cable to an Ethernet port, install a port lightning arrester in
between to protect the device against lightning strokes.
The following port lightning arrester can be installed on the F5000-A5. The specifications for the port
lightning arrester are as follows:
