Communication line filter

Details Communication line filter Communication line filter

H - Electricity

03

H

333/74

H03H 7/12 (2006.01) H02H 9/00 (2006.01) H04B 3/28 (2006.01)

Patent

CA 2029291

- 11 - ABSTRACT OF THE DISCLOSURE This invention relates to a communication line filter for use in series with communication lines. The communication line filter provides for surge protection from voltage spikes and provides frequency filtering to remove selected interference signals from other radiating sources. The communication line filter comprises: two signal conductors linked together by a fuse; a common signal ground; and two shunts for shunting a surge current between the signal conductors and the common signal ground. The shunts provide protection from short duration voltage spikes while the fuse provides protection from longer duration overvoltages. The communication line filter functions effectively, independent of the direction of current flow along the communication line with respect the line filter. The two shunts and the fuse are selected to provide the required capacitance and impedance respectively, to form a suitable frequency notch filter.

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