Proxicast LAN-Cell 2 User's Guide download pdf (Page 631)

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Appendix E Wireless LANs

LAN-Cell 2 User’s Guide

631

Types of Antennas for WLAN

There are two types of antennas used for wireless LAN applications.

• 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.

Country Codes

The table below lists the 3 digit Country Code values for selecting the correct 802.11 radio

channel frequencies for different countries/regions. See Section 7.10 on page 162 for

instructions on changing the LAN-Cell’s default country code (255 - U.S./North America).

If your country is not listed, contact Proxicast Customer Support.

Table 257 Country Codes

COUNTRY

CODE

Australia 244

Astria 233

Belgium 248

Brazil 208

China 222

Czech 246

Denmark 252

European CTR21 212

1 2 ... 626 627 628 629 630 631 632 633 634 635 636 ... 649 650

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