[Onramp]

Cable doesn't currently have the capacity for broadcast that Satellite does.

That could change if the fibre went straight to the set top box - and they start using more than just 1550nm. They could carry multiple separate RF spectrums on multiple wavelengths (in theory).

Or, it could work like satellite. In an RFog area, the cable box could send tones of 22 - 25khz to the ONT outside the house which would then selectively pass the chosen wavelength back to RF (e.g. 1560, 1570, 1580nm). Each one could carry a separate block of spectrum from 45Mhz - 1.2GHz (for example)

That possibility might be used instead for node splitting, however.