Kommunikasjons-system

Between a data terminal equipment located at one extremity and another terminal equipment located at the other extremity. Applicable to remote operation systems, control and data acquisition systems, and remote control and measurement systems used in electrical distribution networks. It is characterised in that it incorporates data conversion means (2) connected to the data terminal equipment and to a control unit (3) via a first bidirectional bus (C3), and which converts and adapts the signals on an analogue bus (C2), or adapts the signals on a digital bus (C1), interchanged between the data terminal equipment and the control unit (3), for both transmission directions. It incorporates a modem and medium/low voltage interface (4) connected to the control unit (3) via a second bidirectional bus (C6), to assemble the data packets to be transmitted to and to recover the data packets received from the electrical distribution network. The modem and medium/low voltage interface (4) is connected to the medium/low voltage electrical distribution network by means of input/output terminals (C7).