If you are a new cable and internet customer you will most likely have a cable modem installed with your cable converters. This will provide you with high speed internet over the same cable connection that gives you your cable TV service. The internet connection uses a designated channel that will not interfere with your cable TV viewing experience. If you are on a fiber connection, you will have all three services(cable, internet, and phone), all coming through the single fiber connection. If you are a current DSL internet subscriber (your internet is carried through the phone line to a DSL modem), the installer may keep your DSL connection and not switch you to a cable modem connection if there is a valid reason. This is done on a case by case basis, and usually at the installers discretion.