The use of the word modem is inaccurate. Modem=modulator / demodulator which changes the modulation of analog signals to digital signals (and in reverse) so that the computer can understand them. Except for the RCA outputs, your player does not deal with analog. More accurately, you need to connect the player via the RJ-45 port to a router which has internet access. Internet access is via a high speed line for which there are MANY types. Most people have a digital subscriber line (DSL) but schools or businesses may have a T1 or even a T5. I am guessing that you want to stream a movie from the player to your computer. Connect the player to a router then connect the router to a high-speed line. I recommend you re-program the router to give the player priority over other connections. Otherwise, the image will become choppy if too many people are accessing the internet via the router while you are watching the movie at the same time.