Xfinity still uses coax cable, to the house and wall outlets. Centric will be fiber all the way to the modem, then using the superior LAN lines to the room outlets. Spectrum, I do not know what they use. A fiber optic/LAN line is superior/preferred over a coaxial cable line. Or you have which ever services modem/wifi router you can wirelessly stream to all your devices. But again, using the LAN is superior. If you care.
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