Sure they exist. I've had DSL service from USWest (now Qwest), Pacbell and now Speakeasy (thru Covad). I've use a Cisco, an Alcatel and now an Efficient external modem.
DSL --> router (I have a 486 funning Freesco) --> switch or hub (I have a Netgear FS105) --> PC's, Macs, printer, etc.
You...