Circuit configuration and chip set for supplying a telephone subscriber loop with a supply voltage and network-side terminal of a telephone subscriber loop

In a circuit configuration for supplying a telephone subscriber loop having first and second lines with a supply voltage, for transmitting a transmitted signal into the telephone subscriber loop, and for receiving a received signal from the telephone subscriber loop, an improvement in the circuit configuration comprising:

• a supply voltage source having a first terminal and a second terminal across which a supply voltage drops;
• a first low-voltage circuit connected to the first line for driving said first line and for directional separation of received signals and transmitted signals on said first line, said first circuit having first and second supply voltage connections;
• and
• a second low-voltage circuit connected to the second line for driving said second line and for directional separation of received signals and transmitted signals on said second line, said second circuit having third and fourth supply voltage connections;
• said first supply voltage connection of said first low-voltage circuit connected to said first terminal of said supply voltage source and said fourth supply voltage connection of said second low-voltage circuit connected to said second terminal of said supply voltage source;
• wherein a voltage between said first and second supply voltage connections and a voltage between said third and fourth supply voltage connections are substantially smaller than the supply voltage.