Abstract: The invention relates to a data communication system, an electronic module with a receiver device, and an electronic module with a transmitter device having two outputs which are used to transmit a differential or symmetrical signal from the transmitter device. The invention is characterized in that the electronic module is also provided with a converter which is used to convert the differential or symmetrical signal into an asymmetrical signal.

Abstract: The active equalization circuit utilizes an electronic potentiometer inserted between the output of an addition amplifier and the input of the equalization structure, wherein the controlled output signal of the potentiometer is supplied to the addition input of the addition amplifier via the series circuit of an impedance transformer and of an impedance. A control network with at least one current controlled circuit functions as the electronic potentiometer. This current controlled circuit being inserted between the input of the impedance transformer and the output of the addition amplifier, and/or between the input of the impedance transformer and the input connection of the equalization structure. The active equalization circuit can be advantageously inserted in a hybrid arrangement between the output of a hybrid circuit connected to a two-wire line and the input of an echo compensator, where the echo compensator is controlled via a control circuit by the output signal of the echo compensator.