Convers network

We have recently installed a conversd in a node (LU7DBL) that is connected to internet. I was thinking about linking it to a convers network. But I have some questions:

Are there many networks or only one?
In case there are more than one, Is there one that is Spanish talking? How could I know which server connect to?

There is another node (LU6DG) that has only 1200 bps radio ports, and has a conversd linked to LU7DBL (on ax25 1200bps). If LU7DBL is linked to a convers network, is that going to generate too much traffic on the radio link?

Well, I think that's all. Many thanks.