Poles With Stretching; Wall Mounted Pole; Antenna Poles Requirements; Grounding When Using Idu-Bs-G - Alvarion BreezeNET B130 GigE Technical User's Manual

Chapter 2 - Hardware Description
2.3.4

Poles with Stretching

Usually this kind of poles are used when installing antenna on a flat surface and
permits one to raise it to a significant height for providing optimal conditions for
signal propagation.
2.3.5

Wall Mounted Pole

Usually these kinds of poles are used when there is no need to elevate antenna to
the rooftop and there is the possibility to mounting it on a wall. This installation is
significantly simpler than that implementation with poles. Mostly it is used for
subscriber side deployments.
2.3.6

Antenna Poles Requirements

Ease of antenna mounting and sufficient mechanical durability should provide
reliable fastening in conditions of high windy loads. Poles should have round
profile for ease of azimuth adjustment. Typical pole diameter is 30 to 50 mm.
2.3.7

Grounding when Using IDU-BS-G

Antenna should be placed on the mast on the level that is at least 1 meter lower
than a mast's top. In this case it is of big probability that the lightning strikes the
mast and not the antenna. The mast is to be grounded on the grounding contour
according to your local standards. When the lightning strikes the antenna, the
current goes through the coaxial cable which grounds ODU clamp with the mast -
the mast is grounded via the grounding contour. The direct lightning strike to the
STP service cable (ODU-IDU) is partially terminated on the grounded IDU case.
Partial termination means that the direct lightning strike will probably destroy an
STP cable. The service cable pickups from the electromagnetic impulses are
terminated on the IDU case by the winding shield, and further - on the IDU
grounding. IDU is grounded via a three-conductor power cord and a 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).
CAUTION
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.
Alvarion BreezeNET B130/B300 GigE 15
Installation Preparations
Technical User Manual