Let's stick with standards when this was more common. The coax was 50 Ohms and is at wikipedia at https://en.wikipedia.org/wiki/10BASE2
The speed was 10 megabit and was indeed called Ethernet. During the years of transition to 10BASET there were hubs for both 10BASE2 and 10BASET that handled the conversion.
Most folk today would get upset over a 10 megabit LAN but yes, one can do this still. The skill level is just above your new networker.
-> I wonder if you really meant what you wrote. That is, are you trying to get away from the usual cable modem?
Is anyone aware of the amount of degradation if any going from coax to Ethernet?
I currently have cable internet but want to use my own router (AC) would I experience much degradation if I were to use a coax to ethernet adapter or a bridge?

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