System and method for the data transmission of digital transmission data

An arrangement for the data transmission of digital transmission data between a first digital protective device and a second digital protective device on a section of a power supply line in a transmission direction and in a reception direction, the first digital protective device being connected to one end of an electrical single-pair data transmission line via a first interconnect device, and the second digital protective device being connected to another end of the electrical single-pair data transmission line via a second interconnect device, wherein

• for enabling the data transmission of digital transmission data in the transmission and reception directions, the interconnect devices each contain an ISDN module with an IOM2 interface and an output interface, the IOM2 interface being connected to a respective digital protective device, and the output interface being connected to the single pair data transmission line, and wherein
• the digital transmission data is transmitted between the interconnect devices in a manner of digital telecommunication data being transmitted in a digital telecommunication network between a digital network terminating device on a digital subscriber terminal and a digital line terminating device in a digital switching center.