Abstract: An impedance blocking filter circuit is used in telecommunication systems for interconnecting between incoming telephone lines carrying Digital Subscriber Line (DSL) signals and a customer's terminal equipment in order to block impedances above a desired frequency. The impedance blocking filter circuit includes a low pass filter circuit having at least one capacitive pole providing component. The impedance blocking filter circuit also includes a tank circuit coupled in series with the at least one capacitive pole providing component to provide impedance matching for the customer's terminal equipment.