ZyXEL Communications Network Card unified security gateway Manuel d'utilisateur télécharger pdf (Page 818)

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Appendix C Wireless LANs

ZyWALL USG 20/20W User’s Guide

818

• Omni-directional antennas send the RF signal out in all directions on a horizontal

plane. The coverage area is torus-shaped (like a donut) which makes these

antennas ideal for a room environment. With a wide coverage area, it is possible

to make circular overlapping coverage areas with multiple access points.

• Directional antennas concentrate the RF signal in a beam, like a flashlight does

with the light from its bulb. The angle of the beam determines the width of the

coverage pattern. Angles typically range from 20 degrees (very directional) to

120 degrees (less directional). Directional antennas are ideal for hallways and

outdoor point-to-point applications.

Positioning Antennas

In general, antennas should be mounted as high as practically possible and free of

obstructions. In point-to–point application, position both antennas at the same

height and in a direct line of sight to each other to attain the best performance.

For omni-directional antennas mounted on a table, desk, and so on, point the

antenna up. For omni-directional antennas mounted on a wall or ceiling, point the

antenna down. For a single AP application, place omni-directional antennas as

close to the center of the coverage area as possible.

For directional antennas, point the antenna in the direction of the desired

coverage area.

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ZyXEL Communications Network Card unified security gateway Manuel d'utilisateur Page 818

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