said by proletarian :

geekgirl,
you're confusing the cable company return path. they use freq's under 55 or so for their return. and the stb's don't talk back to the ont, they communicate back to the router via moca (over 1GHz). from their the return is sent on the data upstream path either by ethernet or coax. the fios return path is via moca which is above 1GHz