In this example we have a RBXM with a NET.INT. board installed: a standard modem is connected to the RS232 port of the NET.INT. board itself.

From your PC, using remote access (PPP protocol), you can activate the modem connection on a standard RTG line (default telephone line): at this point your PC will communicate with the RBXM via TCP/IP over PPP, allowing to access any TCP application on the NET.INT.