Outdoor Installation Considerations; Site Selection Factors - Alvarion BreezeNET PRO.11 Series User Manual

Planning and Installing Wireless LANS

5.3 Outdoor Installation Considerations

This chapter describes various considerations to take into account when planning an
outdoor installation including site selection, antenna alignment, antenna diversity,
antenna polarization, antenna seal, and cell size.

5.3.1 Site Selection Factors

When selecting a location for external antennas, remember to take into
consideration the following guidelines:
Minimum distance between sites
Maximum height above the ground
Maximum line of sight clearance
Maximum separation between antennas (diversity option)
A propagation path is the path that signals traverse between the antennas of any two
bridges. The "line" between two antenna sites is an imaginary straight line, which
may be drawn between the two antennas. Any obstacles in the path of the "line"
degrade the propagation path. The best propagation path is, therefore, a clear line of
sight with good clearance between the "line" and any physical obstacle.
Any physical object in the path between two bridges can cause signal attenuation.
Common obstructions are buildings and trees. If a bridge's antenna is installed
indoors, the walls and/or windows between the two sites are physical obstructions.
If the antenna is positioned outdoors, any buildings or other physical structure such
as trees, mountains or other natural geographic features higher than the antenna and
situated in the path between the two sites can constitute obstructions.
User's Guide
5-16
BreezeNET PRO.11 Series