Circuit for interfacing non-dial telephone and automatic...

H - Electricity – 04 – M

Patent

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379/30

H04M 1/00 (2006.01) H04M 11/04 (2006.01)

Patent

CA 1145077

CIRCUIT FOR INTERFACING NON-DIAL TELEPHONE AND AUTOMATIC SWITCH EQUIPMENT ABSTRACT OF THE DISCLOSURE A ring-down or non-dial subscriber telephone such as a freeway emergency telephone is connected to automatic electronic switching (EAX) equipment for interconnection with an emergency operator by an interface circuit having a polarity-sensitive full wave bridge controlling voice connection of the tele- phone to the operator. Actuation of the bridge is controlled by a current sensitive controller connected in series with the originating loop containing the freeway telephone. The bridge monitors the on-hook and off-hook states of the called telephone and ener- gizes alarm circuitry upon failure of the calling telephone to go on-hook within a predetermined tome after the called telephone goes on-hook. The circuit also has an isolating photo-coupled switch for mon- itoring current flow in the originating loop containing the calling telephone and for energizing a common alarm circuit in the EAX equipment in the absence of such current flow. A relay circuit is also pro- vided for disconnecting the interface circuit from the common alarm system while retaining identification of the calling telephone responsible for the alarm condition.

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