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IEEE 802.11ac

http://www.smallnetbuilder.com/wireless/wireless-features/32621-smallnetbuilders-classification-system-for-wifi-products-2015

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In product specifications and marketing terminology, 802.11ac devices are commonly classified by their type, which consists of the letters AC followed by the sum of the maximum data rate in the 2.4 and 5 GHz bands, rounded to the nearest multiple of 50.