Ring trip detector for a solid state telephone line circuit

Details Ring trip detector for a solid state telephone line circuit Ring trip detector for a solid state telephone line circuit

H - Electricity

04

M

379/16

H04M 3/02 (2006.01)

Patent

CA 2029138

A RING TRIP DETECTOR FOR A SOLID STATE TELEPHONE LINE CIRCUIT ABSTRACT A ring trip detector for a solid state line circuit is disclosed that includes, a logic interface circuit connected to a central controller. The logic interface circuit is arranged to receive signals from the central controller for applying an ac ringing current to the subscriber loop and to transmit status signals from the ring trip detector to the central controller. A resistor, connected to the subscriber loop through a ringing current conductor, detects and develops a differential voltage that is proportional to the ac ringing current. A voltage convertor circuit, connected to the resistor, divides down the differential voltage and converts the differential voltage to a ground referenced voltage signal. An active filter circuit, connected to the voltage convertor circuit, receives the ground referenced voltage signal and filters out an ac voltage component leaving a dc voltage component that is drawn into the subscriber loop from the central office battery, when a subscriber instrument goes "off-hook". A comparator circuit, connected to the active filter circuit, develops and transmits to the logic interface a ring trip signal when the dc voltage component is less than the threshold voltage, terminating the ringing current and providing a status signal to the central controller indicating that a ring trip has occurred.

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