WLAN Radius

Wireless Local Area Network (WLAN) is becoming more and more common with the passing of every day. Such networks normally offer a transmit rate of 11 Mb/s and cover a range of tens of meters. Wireless networks utilize frequency bands.

There are 2 primary methods for wireless signal transmission. One is light, particularly infrared and the other being radio waves. Light transmission is for short range, for example, between a mobile phone and a laptop computer, while radio waves are versatile. The connection may be very short, like between a computer and its keyboard or very long, like between a satellite dish and the satellite. The International Telecommunications Union ? Radio communications (ITU-R) that is a subsidiary of the UN coordinates international standards, regulations and promotes the effective use of the radio. This plan divides the world into 3 regions.

• Europe, Africa, Middle East and Russia.
• North America and South America.
• Japan, China, Southeast Asia and South Pacific.

As for WLAN coverage, it depends strongly on the environment. A general estimate for a point-to-point distance of 2.4 GHz signal in an open environment may go up to 120 miles but could be as high as 200 m. Whereas in an obstructed environment, it could hardly be 10 m. WLAN equipment?s coverage area also varies from one manufacturer to another.

There are a few license free radio bands for different purposes. The ISM band is controlled by the Telecom Standardization organization of the ITU (ITU-T) and includes several frequency ranges ? 902--928 MHz, 2.4 ?2.483 GHz; 5.15 ?5.35 GHz; 5.725 ?5.875 GHz.

Apart from wireless network equipments, video cameras, microwave ovens and Bluetooth equipments all use the 2.4 ?2.483 GHz frequency range. The management of WLAN radio environment is a compelling factor for achieving a satisfactory result. The WLSE simplifies the deployment, expansion and day-to-day management of your WLAN radio environment. Using radio management, intrusion detection and site management features, you will be able to automatically configure network-wide radio parameters during initial deployment and network expansion.