Central office interface circuit

Details Central office interface circuit Central office interface circuit

H - Electricity

04

M

379/67, 379/73

H04M 7/00 (2006.01) H04M 1/738 (2006.01)

Patent

CA 1144671

CENTRAL OFFICE INTERFACE CIRCUIT Abstract of the Disclosure An interface circuit for interconnection between a central office line and a telephone apparatus (e.g. telephone set, automatic telephone answering machine, etc.) is disclosed. The interface circuit includes a rectifier which allows the interface circuit to be connected across the central office line, in parallel with other interface circuits, without the use of isolation switches. The rectifier rectifies any AC signal that may be present (e.g. voice signals) and applies the rectified signal to a normally present capacitor. These AC signals, now rectified, cause the capacitor to become charged; once charged, the current path via the capacitor is effectively blocked. As a consequence, AC signals are not passed by the capacitor. - i -

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