Our host site needed an internet connection in an adjoining building, more then 650 feet away and across the street from the CDL studio. Normally I would recommend OM3 fiber, which is good for 10GB.
As the host is taking a severe financial hit due to COVID19, we came up with a much cheaper solution: Using RG-11 coax (Cable Television feeder) we installed an aerial cable, using normal outside plant protection techniques (a lightning arrestor at both ends where the coax enters the building, along with an 8' ground rod from the big box store)
The coax connects to a pair of these, which is providing a solid 850 Mbps connection: Link to adapter
So if you need a way to get an internet connection to your studio, and there is leftover cable TV wiring, this is an easy way to do it.
I always wondered what the coaxial ethernet protocol was about, seeing it first on dumpster dived ethernet cards with BNC connectors on them years ago. I guess it's the same idea as cable modems like the Surfboard that people had in this century.
Now my current internet terminal has a real short piece of coax to the router, same stuff as TV, with F-connectors on both ends, so it may be the same protocol as those Actiontec converters.
It's good you could put coax to work in that situation, and coax has been proven reliable for years in outdoor situations for TV runs, so to get a gigabit connection from leftover coax, not a bad solution.