Cisco AIR-BR1410A-A-K9 - Aironet 1410 Wireless Bridge Deployment Manual page 29

Tip: Don't get Beamwidth confused with polarity which is the orientation of the antenna.
Technical Jargon: Beamwidth is defined as a measure of the ability of an antenna to focus radio
signal energy towards a particular direction in space. Beamwidth is usually expressed in degrees
HB being Horizontal Beamwidth usually the most important one with VB being the Vertical
Beamwidth (up and down) radiation pattern. When viewing an antenna plot or pattern, the angle is
usually measures at half-power (3 dB) points of the main lobe when referenced to the peak
effective radiated power of the main lobe.
When linking buildings of different heights, the antenna on the higher
Figure 27.
building should be aimed downward to compensate for the height disparity and
vice versa.
4.5 Using the Outdoor Bridge Range Calculator
The Cisco Outdoor Bridge Range Calculation Utility was written using Microsoft Excel so the user
is able to see exactly how the calculations are performed. This utility supports Wireless Bridge links
using Cisco 2.4 GHz (BR-350 Series Bridges) as well as the Cisco 5.7 GHz (BR-1410 Series
Bridges).
There are many variables that affect the overall distance of a Bridge link; let's define the variables
used in the Outdoor Bridge Range Calculation Utility.
1. Regulatory Domain - Depending on which country you are located in, your Cisco Bridge
product may have different frequencies, power or performance settings designed to
conform to the regulatory body responsible for radio communications in your country.
2. Bridge Model Number – This gives you a choice to select the Bridge model either with
integrated antenna or the Bridge model with a remote antenna. Each model number has
different power level settings and antenna options, depending upon the regulatory domain
selected. One can select a model number available which best suits one's needs with
regards to mounting options available, length of the wireless link, etc.,
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