[Sephiroth]

They combine and amplify the individual circuits (taps) in the big Magnavox box which then combines with the incoming coax from the street box further up and produce a single amplified coax to the next street box, and so on until it reaches the optical node where it's all remodulated to fibre optics.

Something like that. In other words, your supposition is correct. There is a clue on kwik's phot if you study it.