The FAQ articles on TP-LINK support website keep being enriched.

Please search "EAP" as keywords to find out more useful informations.
http://www.tp-link.com/en/search/?q=EAP&t=FAQ

You can also visit product support pages to find the relevant FAQs.
e.g.
http://www.tp-link.com/en/download/EAP120.html#FAQs
http://www.tp-link.com/en/download/EAP220.html#FAQs
http://www.tp-link.com/en/download/EAP120.html#FAQs