In my experience, WLAN design is a black art. If you talk to the manufacturers, they say "Oh yeah! 50+ nodes per AP," but then want to sell you plenty more APs because "for GREAT performance you need one AP per 15 nodes!" 15-25 nodes per AP works well, in my experience, with a good switch (fast backplane) behind the APs. Accurate surveying is needed to ensure that the zones are slotted together efficiently. My honest advice is to REALLY think about your deployment, use architect plans, tools like Visio, etc. to really understand your environment, as selecting the correct antennas for the various areas of your facilities can make a world of difference to the performance. Best of luck.
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