Telephone lines status sensor

Details Telephone lines status sensor Telephone lines status sensor

1982-07-12

1984-05-01

Schreyer, Stafford D.

179 99LC, 179 99LS, 179 81R, H04Q 520

Patent

active

044463383

ABSTRACT:
A lines status sensor provides for monitoring of the operating status of one or more telephone lines at an associated telephone station apparatus. The lines status sensor includes a translation circuit being responsive to potential differences appearing across the telephone line, for generating a voltage signal of corresponding polarity in relation to a reference voltage. A voltage divider circuit provides the reference voltage in addition to a first limit voltage being of a more negative potential than the reference voltage, and a second limit voltage being more positive than the reference voltage. A detection circuit is responsive to the first and second limit voltages such that when the potential of the output voltage from the translation circuit is within a range as defined by the first and second limit voltages, an output signal of the detection circuit is of one binary state thereby indicating an OFF HOOK status of the telephone line, and when the potential is outside of the range the output signal is of another binary state thereby indicating an ON HOOK status of the telephone line. In a variation of the line status sensor a wider range is useful for detecting the presence of ringing signals on the telephone line.

REFERENCES:
patent: 4323734 (1982-04-01), Kimzey

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