The max that you see on the data sheet does mean you can have x amount connected, but doesn't guarantee any throughout. The rule of thumb is 25 clients per AP. High density in a school is having like one AP per room that may hold up to around 30 students. Also including APs in the hallway, etc. Office areas can be the same. One AP per 25 or less users. Auditorium or large open areas are difficult to do high density like what I mentioned above because of the signal bleed in open areas. It's harder to control that. In these areas, you might look at the stadium APs and the stadium antennas.
Just remember, the amount of clients depend on the application that is being used on the wireless. If your doing video streaming, you may only have 8 devices connected before the user experience starts getting affected. Wireless is half duplex. So you take the max throughout on the 2.4ghz using. 802.11n and you divide that in half. So 144mbps is actual 73mbps throughout for one device. Now with two devices, you divide that again in half, so 36mbps for each and so one.
Hope this helps you understand.
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-Scott
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