Here is my problem.

I have a customer with and outside venue. He wants, or needs a WIFI solutions so that his POS Devices (15 of them) can get out to the Net to complete a SSL payment Transaction. Cabling is not a option. Cost is of course a concern. For his POS Devices they will be in different locations through out 50 anchors’. The POS devices will have to plug into a WIFI unit because the POS devises are not WIFI capable only Ethernet compatible. What I do have, or will have in place is a powerful outdoor Access Point that will connect to a router, then to an ADSL modem. My question is what type of equipment can I use to transmit between the AP and the POS Terminals? Note that the POS device will need to be assigned DHCP either through a router at the POS side or assigned through the router at the Mounted AP.

ADSL -> ROUTER -> AP ---???---> Router -> POS Device

I need to know what to use for ???

Hope this all make a little sence, But it difficult to explain.