The present invention relates to a device for coupling of a modem to a power supply system for the transmission of data via the power supply network, comprising a power supply, which is adapted to the apparatus is provided with a phase conductor, a neutral conductor and a protective conductor of the power supply network, to connect a transformer, comprising a secondary winding, a first primary winding and a with the first primary winding connected in series second primary winding, wherein the apparatus is set up for this purpose, a secondary-side transmission channel with two primary transmission channels to couple at least in terms of radiofrequency.
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