Detector circuit for sensing battery polarity and loop closure

Details Detector circuit for sensing battery polarity and loop closure Detector circuit for sensing battery polarity and loop closure

1977-12-12

1978-11-21

Cooper, William C.

H04M 714

Patent

active

041267656

ABSTRACT:
A detector circuit for use in conjunction with a trunk circuit of a PABX telephone system interfacing with a central office providing for constant monitoring of normal or reverse battery application by the central office during the high impedance idle state or the low impedance busy state. In addition, the circuit provides for detection of: proper loop closure, electrically shorted tip and ring leads, open circuit condition of tip and ring leads or a grounded ring lead. Furthermore, the circuit indicates when current flow of proper magnitude is sensed during normal or reverse battery conditions.

REFERENCES:
patent: 4049919 (1977-09-01), Young

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