SMC EliteConnect Wireless Bridge Podręcznik Użytkownika Pobierz pdf (Strona 34)

Bridge Link Planning

3-2

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.

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.

Antenna Height

A reliable wireless link is usually best achieved by mounting the antennas at each

end high enough for a clear radio line of sight between them. The minimum height

required depends on the distance of the link, obstacles that may be in the path,

topology of the terrain, and the curvature of the earth (for links over 3 miles).

For long-distance links, a mast or pole may need to be contsructed to attain the

minimum required height. Use the following table to estimate the required minimum

clearance above the ground or path obstruction.

Visual Line of Sight

Radio Line of Sight

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 317 318

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SMC EliteConnect Wireless Bridge Podręcznik Użytkownika Strona 34