FFT Length (802.11n/ac/ax/be)

Default: 128

Range: 64, 128, 256, 512

The FFT Length parameter specifies the Fast Fourier Transform length. For 802.11n, only 64 and 128 are available. 802.11ac adds 256 and 512. See Preset to Standard for the preset values.

FFT Length is only visible for the 802.11n/ac standard formats. For 802.11ax/be standard formats, see FFT Length (HE).

The FFT Length is coupled with the Standard parameter on the Format tab. When a Standard is selected, the FFT Length is automatically set to the correct value. Similarly, selecting a FFT Length will change Standard to the appropriate selection. For example, an FFT Length of 256 will set Standard to 802.11ac 80 MHz.