Fig. 73: Wireless bridge with connection of wireless clients
To be able to set up a wireless link to bintec bridges, an uninterrupted view must exist
between the antennas at both ends. This is called a line of sight, abbreviated to LOS.
The term line of sight does not just mean a straight line of vision between the two anten-
nas, but a kind of tunnel, which must not be disturbed by obstacles. This tunnel is called
the 1st Fresnel zone. The Fresnel zone has the shape of an ellipse rotated around its lon-
gitudinal axis. At least 60 % of the 1st Fresnel zone must remain free of obstacles. The ra-
dius (or the small semi-axis) depends on the frequency used and the distance between the
antennas.
Fig. 74: 1. Fresnel zone
Example: Radius of 1st Fresnel zone as a function of distance from transmit antenna for
antenna separation of 5 km at 2.45 GHz.
Example 1
11 Wireless LAN Funkwerk Enterprise Communications GmbH
170 bintec W1002/W1002n/W2002/WIx040/WIx065
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