The management frames indicate that the access point has an 802.11ac interface by including the VHT (Very High Throughput) Capabilities information element, containing the following fields.
The information provided by the VHT Capabilities Info field is described in Table 5.1.
Table 5.1. Subfields of the VHT Capabilities Info field
|Maximum MPDU Length||Indication of the maximum size of the MPDU frame (3,895, 7,991 or 11,454 bytes)|
|Supported Channel Width Set||Indication of the bandwidth of the radio channel (80 + 80 and/or 160 MHz)|
|Rx LDPC||Using the LDCP error correction code on reception|
|Short GI for 80 MHz||Short guard interval for the 80 MHz radio channel|
|Short GI for 160 and 80+80 MHz||Short guard interval for 80 + 80 or 160 MHz radio channel|
|Tx STBC||Transmission for the space-time diversity STBC|
|Rx STBC||Indication of the number of spatial streams supported for STBC diversity|
|SU Beamformer Capable||Indication relating to the beamforming for a single user, at the beamformer level|
|SU Beamformee Capable||Indication relating to the beamforming for a single user, at the beamformee level|
|Beamformee STS Capability||Indication of the maximum number of space-time stream supported for beamforming by the beamformee|
|Number of Sounding Dimensions||Number of antennas involved in the assessment of the radio channel|
|MU Beamformer ...|