SMC Networks 2.4GHz/5GHz manual Bridge Link Planning

Bridge Link Planning

This area is known as the first Fresnel Zone of the radio link. For a radio link not to be affected by obstacles along its path, no object, including the ground, must intrude within 60% of the first Fresnel Zone.

The following figure illustrates the concept of a good radio line-of-sight.

Visual Line of Sight 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.

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.

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