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Which early IEEE 802.11 amendment defined a higher speed physical layer in the 5 GHz band?

802.11a (5 GHz). 802.11b and 802.11g were both 2.4 GHz.

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  1. 802.11b
  2. 802.11g
  3. 802.11a ✔

Why: IEEE titles 802.11a 'Higher Speed PHY Extension in the 5GHz Band'. 802.11b and 802.11g both have titles that put them in the 2.4 GHz band.

Huh, didn't know that: IEEE titles 802.11g 'Further Higher Data Rate Extension in the 2.4 GHz Band'.

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References

Answer: 802.11a. IEEE titles 802.11a 'Higher Speed PHY Extension in the 5GHz Band'. 802.11b and 802.11g both have titles that put them in the 2.4 GHz band.

  1. IEEE 802.11 Working Group Standards Timelines www.ieee802.org/11/Reports/802.11_Timelines.htm
    Higher Speed PHY Extension in the 5GHz Band
    Checked 2026-10-10.
  2. IEEE 802.11 Working Group Standards Timelines www.ieee802.org/11/Reports/802.11_Timelines.htm
    Higher Speed PHY Extension in the 2.4 GHz Band
    Checked 2026-10-10.

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