User manual

MIMO 2x2 Wireless Outdoor Access Point System User Manual
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7. Planning Linkage
7.1 Site Survey
You need to consider the following operating and environmental conditions when performing a site survey:
 Data rates – The sensitivity and the radio range are inversely proportional to data rates. Therefore, the
maximum radio range is achieved at the lowest workable data rate, and a decrease in receiver threshold
sensitivity occurs as the radio data rate increases.
 Antenna type and placement - Proper antenna configuration is a critical factor in maximizing radio
range. As a general rule, the radio range increases in proportion to antenna gain and height.
 Physical environment - Clear or open areas provide better radio range than closed or filled areas.
Clear line of sight (LOS) is required to establish a good and reliable wireless link.
 Obstructions - Metal shelving or a steel pillar can hinder devices. Avoid placing these devices in
locations where those obstructions are between the sending and receiving antennas.
7.2 Planning Radio Path
For the wireless communication, the Line-of-Sight (LOS) will be the major issue overbuilding up the wireless
link. This evaluated procedure is to reduce the obstructions and to avoid the multiple-path signal degrading
the communication quality.
The first requirement is the Line-of-Sight (LOS) between the both side Antennas. The radio line-of-sight
concept is the area along the radio linking path through which is the bulk of the radio signal power travels.
The area is known as the first Fresnel Zone of the radio link. For the radio link, it should avoid to be affected
by obstacles in this path, including the ground within 60% of the first Fresnel Zone.
The following figure illustrates the concept of a good radio line-of-sight.
Figure 29. Line-of-Sight (LOS)