Monitor circuit for detecting failures in a data transmission system

Claim 1

IN A DATA TRANSMISSION SYSTEM OF A TYPE INCLUDING AN ALTERNATING CURRENT SIGNAL TRANSMITTING DEVICE AND AN ALTERNATING CURRENT SIGNAL RECEIVING DEVICE, EACH DEVICE INCLUDING INDUCTIVE WINDINGS, AND SEVERAL ELECTRICAL CONDUCTORS TO OPERATIVELY CONNECT SAID INDUCTIVE WINDINGS OF THE TRANSMITTING DEVICE TO SAID INDUCTIVE WINDINGS OF THE RECEIVING DEVICE FOR TRANSMITTING SAID SIGNAL FROM THE TRANSMITTING DEVICE TO THE RECEIVING DEVICE; THE IMPROVEMENT COMPRISING THREE CAPACITORS OF EQUAL ELECTRICAL CAPACITANCE, ONE OF SAID CAPACITORS BEING CONNECTED IN EACH OF SAID ELECTRICAL CONDUCTORS, A FIRST RESISTOR ELEMENT TO SHUNT ONE OF SAID CAPACITORS, A SECOND RESISTOR ELEMENT TO SHUNT A SECOND OF SAID CAPACITORS, SAID FIRST AND SECOND RESISTOR ELEMENTS HAVING EQUAL ELECTRICAL RESISTANCE VALUES, A NORMALLY BALANCE ELECTRICAL NETWORK HAVING AN ELECTRICAL INPUT AND AN ELECTRICAL OUTPUT, A DIRECT CURRENT SOURCE OF ELECTRICAL ENERGY OPERABLY CONNECTED TO SAID INPUT, OTHER ELECTRICAL CONDUCTORS LEADING FROM OPPOSITE SIDES OF A THIRD OF SAID CAPACITORS TO ELECTTICALLY CONNECT A PART OF THE DATA TRANSMISSION SYSTEM INTO THE NORMALLY BALANCED ELECTRICAL NETWORK, SAID PART INCLUDING SAID FIRST AND SECOND RESISTOR ELEMENTS OF SAID ELECTRICAL CONDUCTORS, AND FAULT WARNING MEANS CONNECTED TO THE ELECTRICAL OUTPUT OF SAID NORMALLY BALANCED ELECTRICAL NETWORK TO BE RENDERED OPERATIVE UPON THE ELECTRICAL OUTPUT BECOMING EFFECTIVE BY AN UNBALANCING OF THE NETWORK DUE TO A DISCONTINUITY ARISING IN THAT PART OF THE DATA TRANSMISSION SYSTEM ELECTRICALLY CONNECTED IN SAID NORMALLY BALANCED ELECTRICAL NETWORK.