this unit be easy to install , I just unhook the connector from my old modem and plug they into this new one , call Comcast to register the unit and it be work . Comcast just need the Mac ID number which be on the bottom of the unit and on the box it come in . they verification process take a few minute and now we internet speed be much faster ! we old modem be so old it could not handle the higher speed we be now get from Comcast . what a great difference !