Most of the technical person thinks that wireless networking represent the future of computer and Internet connectivity worldwide.
Wi-Fi Technology or you can say WLAN developed by the Institute of Electrical and Electronics Engineers (IEEE) in 1997.
In some country Wi-Fi is also known as a wireless LAN (WLAN).But it’s not true because it’s depend on Wi-Fi certificates.
Wi-Fi Technologies
802.11
In 1997 IEEE created the first WLAN standard and called it 802.11 Unfortunately, 802.11 only supported a maximum network bandwidth of 2 Mbps and use the unregulated radio signal frequency (2.4 GHZ). 802.11 was not famous because of its low speed.
802.11b
IEEE developed the 802.11b standard in July 1999 and this standard supports bandwidth up to 11 Mbps.
802.11b uses unregulated radio signaling frequency (2.4 GHz) same as the 802.11 standard. Being unregulated, 802.11b gear can incur interference from other electronic appliances such as microwave ovens, cordless phones, and other appliances using the same 2.4 GHz range. Whenever, by installing 802.11b gear mind the gap from other appliances, so interference can easily be avoided.
802.11a
802.11b and 802.11a was created at the same time in 1999. But 802.11b gained in popularity much faster than 802.11a due to its high cost, 802.11a is usually made for business networks whereas 802.11b made for the home market.
802.11a supports bandwidth up to 54 Mbps and use the regulated frequency spectrum around 5 GHz. Because 802.11a and 802.11b utilize different frequencies, both technologies are incompatible with each other.
802.11g
In 2002 and 2003, IEEE developed a newer standard called 802.11g. 802.11g support both 802.11a and 802.11b standard. 802.11g also supports bandwidth up to 54 Mbps, and it uses the 2.4 GHz. 802.11g is rearwards compatible with 802.11b, so 802.11g equipment will work with 802.11b equipment and also 802.11b equipment will work with 802.11g equipment. That’s why 802.11g is very succeeding in market.
802.11n
The newest IEEE standard in the Wi-Fi technology is 802.11n. It was designed to improve on 802.11g in the term of bandwidth supported by utilizing multiple wireless signals and antennas called MIMO (multiple-input and multiple-output technology) instead of one. Hopefully launch in December 2009.
802.11n connections can support data rates of over 200+ Mbps. 802.11n also offers better range over earlier Wi-Fi standards 802.11n equipment will be rearward compatible with 802.11g gear. 802.11n bandwidth varies between 130 Mbps to 300 Mbps.
