an apparatus for transmitting charging signals on a data transmission path having a line impedance includes a driver device for setting a line voltage level that corresponds to the line impedance . the driver device is configured to provide , in response to a driver input voltage level , a driver output current and a driver output voltage level . a current detection unit provides a current signal indicative of the driver output current and a current signal matching unit receives the current signal from the current detection unit and adjusts a level of the current signal for further processing by a filter device and by a regulation device . a matching filter unit then matches the driver device to a data transmission path unit .