Link Planning - Range and Obstacles

Calculate the range of the link and identify any obstacles that may affect radio performance.

Perform a survey to identify all the obstructions (such as trees or buildings) in the path and to assess the risk of interference. This information is necessary in order to achieve an accurate link feasibility assessment.

The PMP 450 Series is designed to operate in Near-Line-of-Sight (nLOS), Non-Line-of-Sight (NLOS) and Line-ofSight (LOS) environments. A NLOS environment is one in which there is no optical line-of-sight, that is, there are obstructions between the antennas.

OFDM technology can often use multi-pathing to an advantage to overcome nLOS, especially in cases where the Fresnel zone is only partially blocked by buildings, “urban canyons”, or foliage. OFDM tends to help especially when obstacles are near the middle of the link, and less so when the obstacles are very near the SM or AP.

However, attenuation through walls and trees is substantial for any use of the 2.4 GHz, 3.5 GHz, 3.6 GHz, 5.4 GHz and 5.8 GHz frequency bands. Even with OFDM, these products are not expected to penetrate walls or extensive trees and foliage.

Below are link budget details for different PMP 450 Configurations. 

NOTE - these represent performance based solely on calculations in a clear environment. Actual performance in the field may vary.

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