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GThill> you???¡é?¡é?????¡é???¡ére talking about 2 different things: capacity and density. One AP can support up 256 users but AP???¡é?¡é?????¡é???¡és bandwidth is still shared. If you only surf the internet it might give you acceptable results but if you want to do heavy downloads, video streaming etc???¡é?¡é???????| you need to provide capacity. You get capacity by stacking the Virtual Cells. In 2,4Ghz band you have 3 non overlapping channels. Micro Cell architecture does use the 3 channels to deliver either 54Mbps in 11g or 150Mbps in 11n. With Virtual cell you just use 1 channel to provide the same capacity so you have 2 other channel to add more bandwidth if needed. In 11g 3 x54Mbps = 162Mbps and in 11n 150 +300Mbps = 450Mbps.