Surveying Potential Sites; Line Of Sight Analysis - Nokia RoofTop R240 Installation Manual

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3.3 Surveying potential sites

Nokia RoofTop™ Wireless Router Installation Guide
Wherever possible, find a site that is unobstructed for some distance. This
ensures maximum connectivity and allows the system to forward
"packets" of information for existing and future needs.

3.3.1 Line of sight analysis

In order for the Nokia Wireless Router network to operate correctly, there
must be line of sight paths for each link.
Determine that there is a visual line of sight and a radio line of sight
between the router to be installed and its neighboring routers.
It is recommended that each router has a line of sight to at least 2 other
routers to enable several options to route internet traffic to the AirHead.
Visual line of sight
Visual line of sight exists when an imaginary straight line can be drawn
between two antennas without passing through any physical obstructions.
Verifying visual line of sight is the first step in planning the Nokia
Wireless Router System installation. Observation points must be high
enough to allow the viewer to see over ground based obstructions.
Radio line of sight
A radio wave is not like a laser with a narrow, pointed beam. RF waves
fan out from a single source and are diffracted or absorbed by objects that
are near the visual line of sight. This area is called the Fresnel Zone. Clear
radio line of sight exists when there are no physical obstructions in the
Fresnel Zone. It is therefore essential that there is a clear radio path by
raising the antenna as high as possible and away from objects near the
radio path.
Surveying potential sites
9

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