Edge-Core OAP6626A, Руководство пользователя

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Radio Path Planning
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The following figure illustrates the concept of a good radio line-of-sight.
If there are obstacles in the radio path, there may still be a radio link but the quality
and strength of the signal will be affected. Calculating the maximum clearance from
objects on a path is important as it directly affects the decision on antenna
placement and height. It is especially critical for long-distance links, where the radio
signal could easily be lost.
Note:
For wireless links less than 500 m, the IEEE 802.11a radio signal will tolerate
some obstacles in the path and may not even require a visual line of sight between
the antennas.
When planning the radio path for a wireless bridge link, consider these factors:
• Avoid any partial line-of-sight between the antennas.
• Be cautious of trees or other foliage that may be near the path, or may grow and
obstruct the path.
• Be sure there is enough clearance from buildings and that no building construction
may eventually block the path.
• Check the topology of the land between the antennas using topographical maps,
aerial photos, or even satellite image data (software packages are available that
may include this information for your area)
• Avoid a path that may incur temporary blockage due to the movement of cars,
trains, or aircraft.
Visual Line of Sight
Radio Line of Sight