Importance

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Abstract

A DC signalling Detector (DCSD) circuit 10 for processing DC signalling information from a telephony loop. In accordance with the invention the DC signals are processed to indicate, during a first time interval, a tip lead at ground potential, a tip lead at battery potential, and a tip lead disconnected from any potential. During a second interval of time DC signals are processed to indicate a forward loop current, a reverse loop current and the absence of loop current. These six conditions are resolved by the DCSD circuit into two output status lines. The two output status lines are amenable for being input to a controller 2, such as a local microprocessor. The DCSD circuit of the invention thus advantageously combines within one circuit the functionality of a tip voltage detector and a loop current detector.

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First Claim