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IEEE 802.11a-1999

Wi-Fi generations
Generation IEEE
standard 		Adopted Maximum
link rate
(Mb/s) 		Radio
frequency
(GHz)
(Wi-Fi 0*) 802.11 1997 1–2 2.4
(Wi-Fi 1*) 802.11b 1999 1–11 2.4
(Wi-Fi 2*) 802.11a 1999 6–54 5
(Wi-Fi 3*) 802.11g 2003 2.4
Wi-Fi 4 802.11n 2009 6.5–600 2.4, 5
Wi-Fi 5 802.11ac 2013 6.5–6933 5[a]
Wi-Fi 6 802.11ax 2021 0.4–9608[1] 2.4, 5
Wi-Fi 6E 2.4, 5, 6[b]
Wi-Fi 7 802.11be exp. 2024 0.4–23,059 2.4, 5, 6[2]
Wi-Fi 8 802.11bn exp. 2028[3] 100,000[4] 2.4, 5, 6[5]
*Wi‑Fi 0, 1, 2, and 3 are named by retroactive inference.
They do not exist in the official nomenclature.[6][7][8]

IEEE 802.11a-1999 or 802.11a was an amendment to the IEEE 802.11 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 15.407.

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 1.5 to 54 Mbit/s. It has seen widespread worldwide implementation, particularly within the corporate workspace. While the original amendment is no longer valid, the term "802.11a" is still used by wireless access point (cards and routers) manufacturers to describe interoperability of their systems at 5.8 GHz, 54 Mbit/s (54 x 106 bits per second).

802.11 is a set of IEEE standards that govern wireless networking transmission methods. They are commonly used today in their 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac and 802.11ax versions to provide wireless connectivity in the home, office and some commercial establishments.


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  1. ^ "MCS table (updated with 80211ax data rates)". semfionetworks.com.
  2. ^ "Understanding Wi-Fi 4/5/6/6E/7". wiisfi.com.
  3. ^ Reshef, Ehud; Cordeiro, Carlos (2023). "Future Directions for Wi-Fi 8 and Beyond". IEEE Communications Magazine. 60 (10). IEEE. doi:10.1109/MCOM.003.2200037. Retrieved 2024-05-21.
  4. ^ "What is Wi-Fi 8?". everythingrf.com. March 25, 2023. Retrieved January 21, 2024.
  5. ^ Giordano, Lorenzo; Geraci, Giovanni; Carrascosa, Marc; Bellalta, Boris (November 21, 2023). "What Will Wi-Fi 8 Be? A Primer on IEEE 802.11bn Ultra High Reliability". arXiv:2303.10442.
  6. ^ Kastrenakes, Jacob (2018-10-03). "Wi-Fi Now Has Version Numbers, and Wi-Fi 6 Comes Out Next Year". The Verge. Retrieved 2019-05-02.
  7. ^ Phillips, Gavin (18 January 2021). "The Most Common Wi-Fi Standards and Types, Explained". MUO - Make Use Of. Archived from the original on 11 November 2021. Retrieved 9 November 2021.
  8. ^ "Wi-Fi Generation Numbering". ElectronicsNotes. Archived from the original on 11 November 2021. Retrieved 10 November 2021.

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