From SIG Symbols (Guard Interval) (802.11n/ac/ax/be/bn)
When is selected, the VSA uses information detected within the HT-SIG High-Throughput SIGNAL field or VHT very high throughput (VHT) physical (PHY) layer protocol data unit (PPDU):A PPDU transmitted using the TXVECTOR FORMAT parameter equal to VHT.-SIG sections of the preamble to determine the Guard Interval.
See Also
