led display unit with electrical interface connector to be controlled from far end through optical fibre cable with server rs 232 comport. what is best suited to interlink ofc to coaxial link. distance varies 1 km to 20 km
The converter you need to use once the signal has arrived at a node is the same as Cable TV and Phone companies use. As has been said it is a basic item.
I assume you are using the optical fibre to get the signal into the building then using the converter?
Here is a list which should help, but get back to me if you need to.
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