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2.2 Site Analysis
6
The goals of site analysis are:
•
To determine the feasibility of RF links at each site
•
To determine the antenna and cable requirements necessary to
provide service
2.2.1 RF Link Feasibility
Wireless routers operate in a "mesh" network—line of sight is required to
only one other radio in the network. The IP routing capability allows all
units to act as repeaters for other units.
Survey all obstructions to potential sites. For most installations use an
omnidirectional antenna. This assures maximum connectivity and allows
the unit to forward packets for existing and future needs.
NOTE:
To maintain broadband data rates, it is recommended that
networks be kept within three hops.
2.2.1.1 Site Survey Steps
1.
Determine if there are Line of Sight (LOS) paths for each proposed
link. Line of sight exists if there are no obstructions (for example,
trees, buildings, etc.) between the antennas. For best results, there
should be no obstructions between the two antennas. For long
distance paths there should be no obstacles close to the RF path.
2.
Determine the antenna location and maximum possible antenna
height. The height of the antenna is often dependent on the physical
limitations of the site. For example, an antenna mast can be placed on
a rooftop, an antenna can be installed on an existing structure or
tower, or the mast and antenna can be installed on the ground.
Nokia RoofTop™ Wireless Routing Installation Guide
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