Avaya WLAN Series, Руководство по установке, Страница: 35 / 110

Determine Range & Clearance
Determine the Outdoor Range
Avaya Outdoor Antenna Installation Guide 3-9
Figure 3-1 Fresnel Zone
If any significant part of this bulged zone is obstructed, a portion of the radio
energy will be lost, which may affect the performance of your wireless link in
terms of maximum range and/or transmit rate.
Looking at Figure 3-1 you will see two variables that determine the shape of the
radio beam, also referred to as Fresnel Zone:
a. The distance between the antennas
b. The clearance required for optimal performance, where clearance should be
interpreted as:
■
Vertical clearance above the ground and the highest buildings or objects
in the signal path, and
■
Horizontal clearance from neighboring buildings and objects in the
signal path.
For optimal range and throughput performance, you must ensure that your
antenna installation provides maximum clearance in both horizontal and vertical
direction.
The minimum clearance for the various antenna combinations and distances is
listed in the grey-shaded columns of Table 3-1 and Table 3-2, where clearance
should be interpreted as follows: