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Interfacing two Panasonics PABX TDA 100 through PRI port:

There are two PBX separated by aprox 2100 ft (700 meters), and there is a fiber optics run already installed.

The requirement is to connect the two PRI ports of the PBXs
As you know a copper-only connection would not work well because of attenuation, moreover a new copper cable run would be necessary.

In order to use the fiber optics run, I plugged in to pbx A a fiber to copper adapter, later the fiber, and on the other side another fiber to copper adapter.

But I get no result.

Note: in other cases (with shorter distances) I have plugged both the pbxs without nuisance.
The used protocol is QSIG

HERE IS THE SCHEME:

|| PABX 100 A (PRI) || === copper === [F2C adapter] --- --- multimode fiber (2100 ft) --- --- [F2C adapter] === copper === || (PRI) PABX 100 ||

seems to me that you need a crossover for
it to work

I have set up 2 kxtda100 with copper links to pri cards and they work well but for fiber links I think it would have to have a cisco 2m mux on each end to convert the signal to cross fiber.

You could put 16 channel VOIP cards on each end and run it on a standard network link across the fiber.