Either way will work. HOWEVER, I would suggest putting the router between the modem and the switch simply because it will enhance your network security. Your router will then act as a gateway and help keep your data secure from prying eyes. Then connect all your internal wired devices to the switch and use the wireless only for wireless devices. Your internal network will still operate at the speed of your switch internally, but all internet will only go as fast as permitted by your ISP. Which, being DSL, is not likely to be much faster than about 3 Mbps, YMMV.