Wikipedia
IEEE 80211a-1999 or 80211a was an amendment to the IEEE 80211 wireless local network specifications that defined requirements for an orthogonal frequency division multiplexing (OFDM) communication system It was originally designed to support wireless communication in the unlicensed national information infrastructure (U-NII) bands (in the 5–6 GHz frequency range) as regulated in the United States by the Code of Federal Regulations, Title 47, Section 15407 Originally described as clause 17 of the 1999 specification, it is now defined in clause 18 of the 2012 specification and provides protocols that allow transmission and reception of data at rates of 1
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