Composite ringing and coin control voltage detector and method

Details Composite ringing and coin control voltage detector and method Composite ringing and coin control voltage detector and method

1989-12-08

1990-10-09

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Testing of subscriber loop or terminal

379146, 379155, 379353, 379373, H04M 302, H04M 1702, H04M 1902

Patent

active

049625209

ABSTRACT:
In a telephone system, a composite detection circuit and method for use in mechanized loop testing to detect both AC ringing and DC coin control voltage at a test access unit. An equalization circuit distinguishes between the two voltages and selectively amplifies the DC components of the voltages, thus amplifying the positive DC coin control voltages out of the detection range of the negative AC ringing voltages and vice versa. Two distinct outputs indicate either a positive or negative voltage detected. Two identical circuits are used, one on the ring line and one on the tip line, to detect positive and negative ringing and coin control voltages.

REFERENCES:
patent: 4273963 (1981-06-01), Seidel

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