Telephone subscriber exchange circuit - uses transformer sec. circuit with two split windings interconnected via rectifying elements

摘要

Subscriber exchange connecting circuit comprises at least a two-wire, four-wire junction and subscriber feed components. It is based on a current or voltage transformer such that the need for a low-pass filter for suppressing noise resulting from battery voltage fluctuations is avoided. Information packing density can be increased. The transformer sec. circuit has two split windings connected together via the rectifying elements. The other ends of the secondaries, having a capacitor connected across them, are connected via a split winding of a terminating transformer for the two-wire, four-wire junction, to a conductor of a subscriber line.