Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1981-05-11
1983-01-18
Schreyer, Stafford D.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
1791752B, 1791752C, 324 51, 324133, 340515, H04M 324
Patent
active
043693415
ABSTRACT:
A line test termination device for use on a telephone subscriber line having a pair of electrically conductive paths to provide an audio-visual indication when interrogated by the telephone central office and a subscriber test to indicate the operability of the subscriber line includes in combination, a first current path having a neon tube and an audio indicator connected in series; a second current path with a first normally open switch, a first resistor, a first zener diode and an indicating meter connected in series, all of which are placed in parallel with the first current path. Additionally included is a current polarizing circuit arrangement connected across the pair of electrically conductive paths to provide a unidirectional flow of current through the first and second current paths regardless of the polarity of voltage applied across the pair of electrically conductive paths. A second switch and a second resistor are connected across the neon tube to provide the subscriber with means for obtaining a dial tone without the use of a telephone instrument. All of the above components may be disposed within a housing that may be permanently left across the subscriber line and received into a conventional telephone socket.
REFERENCES:
patent: 4309578 (1982-01-01), Ahyja
Sachs Martin
Schreyer Stafford D.
TII Industries Inc.
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