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Wireless broadband: an overview of IEEE 802.11 wireless lan technology


Added: 12-10-2008
Author: Allan Ampoloquio
Category: Wideband Internet 		← Back | ↓ Related | Home →


Wireless LAN (WLAN) is a wireless broadband technology that uses radio frequency (RF) to send and receive data through the air, reducing the need for a cable network.

There are two competing RF technologies in the use of Wireless LAN, IEEE 802.11 standards and proprietary technology. All fall under the wireless broadband technology. High-speed broadband capacity to send voice, data and video traffic using the wireless frequency range on one or harmful.

It aims to provide a picture of Broadband Wireless-IEEE 802.11 Wireless LAN is standard size. Agreed upon is the level of 802.11 IEEE (Institute of Electrical and Electronics Engineers, Inc.) the world's leading professional registered in the development of technology. IEEE 802.11 is the standard adopted by the define in the air interface between the client and the wireless base station or between two wireless clients.

The 802.11 standard has evolved and the years he became one of the more successful the technology used. Current standards, including 802.11 b, 802.11 a and 802.11 g of the system.

Radio frequency (RF) is between the use of wireless networks in the dissemination of information on the air. RF works by converting electrical current into radio waves and announced on the air waves with a specified frequency spectrum. For example, AM and FM radio uses the two best known RF base.

Federal Communications Commission (FCC) is one of the use of radio spectrum management between the frequency of 9 Kilohertz (KHz) to 300 gigahertz (GHz). 802.11 WLAN system working in the radio spectrum available to the public, also known as the unlicensed frequency band. This is the spectrum unlicensed band, free for any use provided it is to meet the FCC rules.

FCC as a regulatory governance deliver maximum power and the wireless radio, the type of coding and modulation frequencies used. 802.11 in the operation, the FCC provided for non-licensed radio (like 802.11) must accept interference from electronic licensing system. FCC considers licensing as the basis for tools and equipment.

802.11 Wireless LAN Standard Operating FREQUENCY:
802.11 standard called the frequency of 2.4 GHz (2,4-2,4835 GHz) at 5 GHz ISM band (5,15-5,25 GHz, G.25-5, 35 GHz, 5,725-5,825 GHz) U -Nii band. 802.11 b and 802.11 g operate at 2.4 GHz, while working on 802.11 a 5 GHz band.

802.11 assigned frequency range has different characteristics. Bottom FREQUENCY (2.4 GHz) evidence a little better, but for different bandwidth and data rate. High FREQUENCY (5 GHz) has less range, but speeds greater data but prone to prevent solid material.

This is due to attenuation and interference. The weakening or loss of signal strength during transmission is higher when the receiver away from the transmitter. Obstacles such as mountains and buildings also contribute to the prevention or attenuation ZAIFU radio signals, and the resulting losses or dead spots signals. Depending on what is written, floors, walls, and ceilings can strengthen or weaken the WLAN signal. Disruption can be caused by neighboring centers working on the same frequency channel. 2.4 GHz cordless phones for example can cause major disruption to the 802.11 b wireless network

Wireless broadband and WLAN devices called from two transmitting device to send and receive at one time. Every good transmit and receive IP traffic. An RF antenna into the air force over the area of vaccines. An Antenna provides wireless LAN equipment value, and direction discrimination. The gain is a measure of the increasing power when the image is the pattern of transmission. Discrimination is dependent on the antenna gnment and he can usually described as a vertical or horizontal. Access Point is the best antenna that is designed to work in the instance of the maximum vertical horizontal coverage or discrimination. Antenna placed in a horizontal plane of the vertical limit the scope.

Consider increasing the Wireless LAN antenna and equipment is EIRP. EIRP or equivalent Radiated Power Isotropically little that the government or FCC rules and a maximum of four (4) Watts with restrictions / limitations depending on the type Antenna (Omni-directional or directional) and antenna placement (indoor or out). Some countries such as many 100mw EIRP limit, this will require a license to work. This applies especially to external WLAN equipment.

Send a long-term outdoor wireless broadband and WLAN equipment, please consult your state communications commission guidelines for the use outdoor wireless broadband (WLAN) device.



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