I purchased a combo Netgear Router /Modem. After it arrived I could not use it because the connection into the unit is USB and my signal through my wall plate (Comcast provider) is standard coaxial cable, screw on type. I was told that in parts of the USA their wall connections are USB but not in Florida. Does anyone know if a coaxial cable to USB cable exists and where can I buy one? If I can't find this, unit will have to go on ebay.