InfiNet Wireless R5000 Technical User Manual
Copyright © 2004-2006 by InfiNet Wireless Limited.
10
plug containing a ground. The data & power wires pickups are terminated via
IDU protection scheme (three-conductor power cord and a plug containing a
ground).
Antenna pole, tower, ODU and lightning arrestor should be connected
to the first common grounding contour. Cable thickness should be no
less than 10AWG using corrosion-steady connectors. It is highly
recommended to entrust grounding contour development to the
skilled personnel.
A special attention should be paid if antenna used is not DC-shorted. In this case
additional lightning arrestor should be used between the antenna and ODU.
Suggested grounding diagram is shown on the picture below.
Building grounding
protection cicuit
Antenna mast
Antenna grounding cable
O
D
U
RF cable
ODU grounding cable
connected to the
grounding clamp (on ODU)
and to the antenna mast
on the other side
If antenna NOT DC-
shorted you’ll have to use
an additional grounding
device between ODU and
antenna
Antenna mast grounding
IDU
STP PoE cable
LAN switch
220 V source
IDU grounding
IDU is grounded via a three-
conductor power cord and a
plug containing a ground
Antenna alignment
To obtain maximal system performance antennas must be precisely aligned one
towards another according to LOS requirements. General recommendations for
antenna alignment are the following:
• Align antennas using optical equipment (binoculars, spyglass)
accompanied by mobile phone actions coordination
• Use GPS receiver and area map
• Use build-in InfiNet Wireless Router features. These features allow
evaluating current channel/signal quality and perform precise antenna
alignment
Omni-directional and sector antennas have a wide radiation diagram width, thus
usually they either do not require a very precise alignment or it is just not
necessary due to radio link requirements.
Antenna polarization must be taken into consideration while installation. In most
cases omni-directional and sector antennas have a vertical polarization.
Directional antennas can be installed either with vertical or horizontal
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