I have had both cable and satellite before. In both cases a coax is run from the source to box that digitally decodes the signal, meaning that coax is transmitting a lot of data, often including high speed internet. Yet running a coax from the cable box to the tv only results in standard def picture. What gives?
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when you get tv and internet in the same cable, the available bandwidth is shared between two digital signals, one for internet and one for tv. even sometimes is a digital signal for internet and an analog tv signal that in itself contains many channels. that’s called multiplexing.
the tv box filters the TV signal and uses it, while the internet gateway (the router/modem) takes the internet signal.
when going straight from the tv box to the tv’s digital input, only one channel is being transmitted at full bandwidth, allowing for more information to be transferred at once in one cable, instead of a multiplexed signal with many channels sharing bandwidth being decoded inside your tv.
when the latter happens, you separate the tv signal in the box, but still share the bandwidth of the cable with multiple channels and thus resolution has to be lower (no hd)
as for HDMI being a standard in high speed video transfer protocols, it’s easier and more ubiquitous to use in modern devices for the same task
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