User's Manual

Appendix A. Radio Signal Propagation
User's Manual A-10 BreezeNET DS.11
• In the center of a corridor.
• At the intersection of two corridors.
Many modern buildings have partitions constructed of metal or containing metal
components. We recommend that you install the Access Points on the corridor
ceilings. The radio waves propagated by the
BreezeNET DS.11
LAN are reflected
along the metal partitions and enter the offices through the doors or glass sections.
1.1.2. Antennas for Indoor applications
For most indoor applications, the best choice is the standard unit equipped with its
provided 5dBi antennas. The units are small, easy to install and cover a large area.
In some installations, it is required to install the unit and antenna separately. In
such instances, use the AP-DS.11 with the omni-6 antenna kit (6dbi omni-
directional antenna with 6 feet LMR-600 cable). In the USA (FCC regulated) and
in non-regulated countries, the omni-6 comes with a shorter antenna cable,
extending the coverage area.
The Uni-8.5 is also useful in indoor applications. It is very small and easily wall-
mounted, but its radiation pattern is limited (75°).
BreezeCOM recommends that, for indoor applications, you use two antennas per
unit to utilize the diversity gain of the system.
1.1.2.1 Antenna Diversity
In applications where no multipath propagation is expected, a single antenna is
sufficient to ensure good performance levels. However, in cases where multipath
propagation exists, BreezeCOM recommends that two antennas be used. This takes
advantage of space diversity capabilities. By using two antennas per unit, the
system can select the best antenna on a per-packet basis (every several
milliseconds).
Multipath propagation is to be expected when there are potential reflectors between
the main and remote sites. These reflectors may be buildings or moving objects
such as airplanes and motor vehicles. If this is the case, the radio signal does not