I answered a question about max data capacity of a coax: First, it depends on the size of the cables. Coax has a cut off frequency that decreases with the diameter of the cable. Smaller diameter cables can convey more info. Then there is the Shannon equations Channel capacity - Wikipedia
So noise, transmitter power, receiver noise figure etc all have to be taken into account. But let’s consider a 1 inch coax. You might get 5 GHz through it. With very high order modulation you might get 16 bits per hertz. So 80 GBps in a lab setting may be possible. But this does not even scratch the surface of what a fiber can do in a much smaller size. There is no good reason to use coax if you want high data rates over a distance. Fiber will always be better. I got a notice that I had violated their spam policy and the answer was deleted.... Funny, wikipedia is spam I guess. Not I know not to reference that evil spam wikipedia....
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