Today I ordered an xfinity internet package from comcast. Tomorrow I will be going to a service center to grab the modem, or as they label it "self-install kit". I currently have directv whom have patched into all the pre ran coax in my home. My question is.... will i have to locate comcast's cables outside of my home and run my own coax into a patch, or, can i just splice the preexisting coax which my satellite television is utilizing?