Inscape Data AirEther BR3000 Series, Руководство пользователя

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SB3000 & BR3000 Series User
’
s Manual
`
Rev. 1.1 (July, 2012) 86
Picture 30 Line-of-Sight (LOS)
If there is any obstacle in the radio path, there may still be a radio link, but the quality and signal strength
will be affected. Ensuring the maximum clearance from objects in a path is important. For long-distance
links, the radio signals may be lost partially due to non-LOS issue.
As we setup the radio path for the wireless bridge link, we need to consider these factors:
• Avoid any partial Line-of-Sight between the antennas.
• Be aware of trees that may be near the path or obstruct the path.
• Make sure there is enough clearance from buildings and that is no obstruction or blocking the
path.
• Check the land topology between the antennas by using topographical maps, aerial photos,
or even satellite images.
• Avoid a path that may have temporary blockage due to the moving objects, such as cars,
trains, or aircrafts.
7.3 Antenna Height
A reliable wireless link usually depends on a clear radio Line-of-Sight between the antennas on both
sides. The minimum height determined by the link distance, obstacles that may be in the path,
topology of the terrain, and the curvature of the earth (for links over 2 miles).
For long-distance links,
the mast or pole may need to be constructed to attain the minimum required height. The following
table estimates the required minimum clearance above the ground or path obstruction.