Cyprus Broadband

Hi but does anyone know how you can use you Airport Extreme Base Station with CytaNet?  We've got the CytaNet provided Thomson 585i providing Wireless Router and Modem, but I don't have the knowledge to be able to swap that out for a Linsys AM200 ADSL Modem and the Airport Extreme Base Station.

Or can I plug in the Airport Extreme to the Thomson and get it working that way?

Advice on how to proceed gratefully received.  Thanks.