WIRELESS FIDELITY( WI-FI )
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Wi-Fi is the short form for “wireless fidelity,” and it is used to describe products that follow the 802.11 set of standards developed by the Institute of Electrical and Electronic Engineers (IEEE). The most popular of these is 802.11b, which operates in the 2.4 GHz band (the same frequency band as a microwave oven and cordless telephone) and transfers data at 11 megabits per second (Mbps). The emerging 802.11a standard operates in the 5 GHz band and can transfer data up to 54 Mbps. The 802.11g standard, the newest, is compatible with 802.11b and operates in the same 2.4 GHz band, but it can transfer up to 54 Mbps like 802.11a. These technologies have a range of about 300 feet.
All these standards use the Ethernet protocol and CSMA/CA (carrier sense multiple access with collision avoidance) for path sharing. The high rate of data transmission is achieved by combining channels, but due to higher transmission frequency the range is less that that of lower frequency systems and users require network adaptors that conform to both standards to work in multimode environments.
What makes the Wi Fi standard so alluring? Wi-Fi is cheap, powerful, and, most important, it works. A box the size of a paperback, and costing no more than dinner for two, magically distributes broadband Internet to an area the size of a football field. A card no larger than a matchbook receives it. The next laptop you buy will probably have Wi-Fi built in. Wires may soon be for power alone.
Among the geeks, Wi-Fi has become a fascination, a glimpse of the future of the Internet. Like the Web, it's open, unregulated, and free. It doesn't require a loyalty oath to some corporate behemoth. Anyone can deploy it, and millions have. For many it's an epiphany - the unforgettable impact of being in the presence of something important and new.
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This post was written by: Rajendra Prasad
Rajendra Prasad is a professional blogger, web designer and front end web developer. Follow him on Facebook
