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802.11ac WiFi is a significant improvement over 802.11n and is designed only for 5GHz band.
11ac provides improvement in number of clients supported by AP and higher bandwidth for each client.
Mid-tier and high-end Wave1 products can reach 1.3 Gbps PHY data rates.
802.11ac speed increase is due to:
• Increased channel bonding from a maximum of 40 MHz with 802.11n up to 80 or even 160 MHz.
• Denser modulation, now using 256 QAM, up from 64QAM in 802.11n.
• More MIMO, increased from 4 streams in 11n to 8 streams in 11ac.
Other 11ac Features:
11ac is fully backward compatible.
802.11ac defines an enhanced RTS/CTS protocol.
Wave-2 11ac supports MultiUser-MIMO wherein the AP can send simultaneous streams of data like an Ethernet switch.
11ac provides optional support for Beamforming, which helps in directing the signal in the direction of the client.