The IEEE standard that governs Wi-Fi technology is IEEE 802.11; that standard has gone through several generations since its inception in 1997.
802.11. The original version of the standard, released in 1997, specifies two raw data rates of 1 and 2 megabits per second (Mbit/s) to be transmitted via infrared (IR) signals or by either frequency hopping or direct-sequence spread spectrum in the Industrial Scientific Medical frequency band at...
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http://en.wikipedia.org/wiki/Wi-Fi_Technical_Information
11/25/2007
