A subscriber line interface circuit comprising: a first interface circuit operably coupled to a first subscriber loop; a second interface circuit operably coupled to a second subscriber loop; a power supply circuit coupled to the first and the second interface circuit to provide a first and a second output voltage to the first and second interface circuit, respectively; the power supply circuit comprises: a switching power converter operably supplied with an input voltage and configured to provide an intermediate voltage signal at an intermediate circuit node; at least a first and a second output branch, each output branch comprising an output capacitor (C2, C3) that is coupled to the intermediate circuit node and that provides an output voltage signal that is dependent on the intermediate voltage signal, wherein the first output branch is configured to provide the output voltage signal to the first interface circuit, wherein the second output branch is configured to provide the output voltage signal to the second interface circuit, wherein the switching power converter is configured to set the signal level of the intermediate voltage signal repeatedly to a high voltage level for a first time interval and to a low voltage level when the first time interval has elapsed, wherein each output branch comprises a diode (D2, D3) that couples the intermediate circuit node (N3, N4) with an output circuit node of the output branch, wherein each output branch comprises a resistor (R2, R3), the resistor and the output capacitor of each output branch forming an RC low-pass. a first interface circuit operably coupled to a first subscriber loop; a second interface circuit operably coupled to a second subscriber loop; a power supply circuit coupled to the first and the second interface circuit to provide a first and a second output voltage to the first and second interface circuit, respectively; the power supply circuit comprises: a switching power converter operably supplied with an input voltage and configured to provide an intermediate voltage signal at an intermediate circuit node; at least a first and a second output branch, each output branch comprising an output capacitor (C2, C3) that is coupled to the intermediate circuit node and that provides an output voltage signal that is dependent on the intermediate voltage signal, wherein the first output branch is configured to provide the output voltage signal to the first interface circuit, wherein the second output branch is configured to provide the output voltage signal to the second interface circuit, wherein the switching power converter is configured to set the signal level of the intermediate voltage signal repeatedly to a high voltage level for a first time interval and to a low voltage level when the first time interval has elapsed, a switching power converter operably supplied with an input voltage and configured to provide an intermediate voltage signal at an intermediate circuit node; at least a first and a second output branch, each output branch comprising an output capacitor (C2, C3) that is coupled to the intermediate circuit node and that provides an output voltage signal that is dependent on the intermediate voltage signal, wherein the first output branch is configured to provide the output voltage signal to the first interface circuit, wherein the second output branch is configured to provide the output voltage signal to the second interface circuit, wherein the switching power converter is configured to set the signal level of the intermediate voltage signal repeatedly to a high voltage level for a first time interval and to a low voltage level when the first time interval has elapsed,