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Installing a surge protector (optional)
CAUTION:
Ground the surge protector as near as possible. The grounding resistance must be less than 4
ohms. The grounding resistance must be less than 1 ohm if there are special grounding
requirements.
Generally, you need to connect a surge protector before connecting a signal cable to the router. This
can protect electronic devices against surge over-voltage resulting from lightning strokes and other
interferences, and minimize impact on the router.
The surge protector is serially connected to a signal cable, so the surge protector must satisfy the
requirements of network performance indexes such as data transmission bandwidth, as well as the
lightning protection performance requirement. Before installing a surge protector, consider such
performance indexes of the surge protector as lightning protection, bandwidth, transmission loss,
and port type.
The router supports the following types of surge protectors:
•
Surge
protector
—Maximum discharge current 2.5KA/protection voltage 25V--SMB-75J/
SMB-75J-1W-10Mbps.
•
Surge
protector
—Maximum discharge current 2.5KA/protection voltage 25V-BNC-75K/
BNC-75K-10Mbps.
•
Surge protector (U port)
—Maximum discharge current 3KA/common-mode 400V/differential
mode 170V-RJ11.
To install a surge protector:
1.
Use a double-faced adhesive tape to stick the surge protector onto the router chassis, and
make sure it is as close to the grounding screw of the router as possible.
2.
Measure the distance between the protector and the grounding screw of the router, cut the
ground wire of the protector as appropriate, and securely tighten the ground wire to the
grounding screw of the router.
3.
Use the multimeter to measure whether the ground wire of the protector contacts well with the
grounding screw of chassis.
4.
Insert the outdoor network cable into the protector's IN end, and the cable connected to the
router into the OUT end, and look at the indicators on the surge protector to verify that the
connection is correct.
5.
Use nylon ties to bundle the cables neatly.
