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Wi-Fi system functions in 2.4 and 5 GHz radio bands, with an 11 Mbps (802.11b) or 54 Mbps (802.11a) data rate or with products that contain both bands, so they can give a real-world presentation same as to the basic 10BaseT wired Ethernet networks used in many offices Fundamentals of a WI-FI system. 
 
Nowadays people like every thing to be fast, so people like to use wireless internet connection for fattest speed and without any switch & wire connection. In this wi-fi network connection, the technology is based on as mobile phone, television and wireless network use of a radio wave to send out a data. So for solving this problem, the technical people have prepared a network connection and some wireless system, one of them is 802.11a. The router without any wire connection makes your place clean and the speed of internet also increase. For example, we can take Wi-Fi network connection of the model 802.11a with a speed of 54mbps, which is just enough to search internet and to save time with a great speed. Nowadays in market, laptop and computers are available with in built wireless adapter or you can also easily purchase a plug in version.
In recent days, people are not interested to take an internet connection with wire and modem because it need some one to install it and lots of set up such as electric plugs and wire connection. When you are going to use a wireless connection then you must know the different types of wireless LAN standard. Now in the market, there are three models available such as 802.11b, 802.11a, and 802.g. These models give a lot of facilities in a low cost. If you take a look towards the model 802.11a then it provides you a network connection with a speed of 54 mbps and can support for multipurpose.