Wi-Fi is a wireless brand owned by the Wi-Fi Alliance. Wi-Fi uses the IEEE 802.11 standard to send and receive information between computers. A Wi-Fi device can work with Wi-Fi networks anywhere in the world.
There are many different type of WI-FI (IEEE 802.11) standards, some of the more commonly known ones are Wireless A,B,G,N and now the newly suggested AC & AD. The major difference between these standards is the distance which devices can connect to the access points and the speed (Bandwidth) at which these devices can go.
As of 2013, most wireless networks use one of two radio frequency bands. These are not the only two bands, but probably those used most widely, by common users. One of the bands is at around 2.4 GHz, and the other is at 5 GHz. Both of these have benefits and drawbacks: The 2.4 GHz band is widely used, and devices are usually cheaper. Microwave ovens, baby phones, DECT telephones and other wireless devices also use the 2.4 GHz band, and sometimes cause interference. The 5 GHz band has more frequencies and usually less interference, but there are more rules for using it. In some places, the 5 GHz band may not be used outdoors. Because fewer devices use the 5 GHz band, devices that do are often more expensive.
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References[change | change source]
- "WiFi isn't short for "Wireless Fidelity"". boingboing.net. 2005-11-08. http://www.boingboing.net/2005/11/08/wifi_isnt_short_for_.html. Retrieved 2007-08-31.
- "Wireless Fidelity' Debunked". Wi-Fi Planet. 2007-04-27. http://www.wi-fiplanet.com/columns/article.php/3674591. Retrieved 2007-08-31.
- "What is the True Meaning of Wi-Fi?". Teleclick. http://www.teleclick.ca/2005/12/what-is-the-true-meaning-of-wi-fi/. Retrieved 2007-08-31.
- "Electromagnetic Hypersensitivity (EMS)", 2011
- Q&A: Wi-fi health concerns, BBC News