The invention concerns a digital signal distributing installation comprising a first coupler to be connected to an ADSL line input and to an electric power distribution line, an ADSL modem with a first and a second port, and a second coupler to be connected to the first port of the modem and to the electric power distribution line. Said installation is enhanced by adding thereto an auxiliary electric power distribution line, and a filtering circuit interposed between the electric power distribution line and the auxiliary electric power distribution line.