3com 8810 ユーザーズマニュアル
96
C
HAPTER
A: L
IGHTNING
P
ROTECTION
OF
THE
S
WITCH
the lightning arrester of power is running and the function of lightning
protection has taken effect.
protection has taken effect.
■
Pay adequate attention if the red LED is on. You should correctly locate the
problem, whether it is caused because the ground wire of the arrester is not
well grounded or because the live and zero wires are connected in reverse
direction. You may check that in the following way. When the red LED is on,
use a multimeter to examine polarity at the power socket of the arrester. If it is
same to that of the power socket in the equipment room, it means that
arrester is not well grounded. If it is adverse to that of the power socket in the
equipment room, it means that the power socket of the arrester is set to the
reverse polarity. In this case, you should open the power socket of arrester to
correct polarity. After that, if the red LED still alarms, it means that the arrester
is not well grounded yet.
problem, whether it is caused because the ground wire of the arrester is not
well grounded or because the live and zero wires are connected in reverse
direction. You may check that in the following way. When the red LED is on,
use a multimeter to examine polarity at the power socket of the arrester. If it is
same to that of the power socket in the equipment room, it means that
arrester is not well grounded. If it is adverse to that of the power socket in the
equipment room, it means that the power socket of the arrester is set to the
reverse polarity. In this case, you should open the power socket of arrester to
correct polarity. After that, if the red LED still alarms, it means that the arrester
is not well grounded yet.
Installation of
Lightning Arrester for
Network Port
Lightning Arrester for
Network Port
n
Lightning arrester for network port is specially designed for the Ethernet port of
10/100M electrical interface (RJ-45 connector is adopted in this case).
10/100M electrical interface (RJ-45 connector is adopted in this case).
c
CAUTION: Lightning arrester for network port will not be provided along with the
switch, and you should purchase it by yourself if needed.
switch, and you should purchase it by yourself if needed.
If an outdoor network cable should be led to the switch, please serially connect
the lightning arrester for network port before you plug this cable into the interface
on the switch, in case of the possibility that the switch may be damaged due to
lightning strike.
the lightning arrester for network port before you plug this cable into the interface
on the switch, in case of the possibility that the switch may be damaged due to
lightning strike.
Required tools
■
Phillips screwdriver or Flat-module screwdriver
■
Multimeter
■
Tilted wire cutter
Installation procedure
Step 1: Tear the protection paper at one side of the double faced adhesive tape
apart from the tape, and stick the tape on the surface of the arrester. Tear the
protection paper at another side apart from the tape, and stick the arrester onto
the chassis of the switch. The arrester should be attached on the chassis as close
to the grounding screw as possible.
apart from the tape, and stick the tape on the surface of the arrester. Tear the
protection paper at another side apart from the tape, and stick the arrester onto
the chassis of the switch. The arrester should be attached on the chassis as close
to the grounding screw as possible.
Step 2: According to the distance to the grounding screw of the switch, cut the
ground wire of the arrester, and securely tightening its ground wire to the
grounding screw of the switch.
ground wire of the arrester, and securely tightening its ground wire to the
grounding screw of the switch.
Step 3: Use the multimeter to measure whether the ground wire of the arrester
contacts well with the grounding screw of chassis.
contacts well with the grounding screw of chassis.
Step 4: According to the instruction of arrester for network port, connect the
arrester with switch by the cables (be carefully with the cable direction. Outdoor
network cable should be inserted into the arrester‘s IN end, and the cable
arrester with switch by the cables (be carefully with the cable direction. Outdoor
network cable should be inserted into the arrester‘s IN end, and the cable