Electronic subscriber junctor

Details Electronic subscriber junctor Electronic subscriber junctor

1983-05-19

1985-09-10

Rubinson, Gene Z.

179 16F, 179170NC, H04B 158

Patent

active

045408521

ABSTRACT:
An electronic subscriber junctor for connecting a subscriber line to a telephone exchange, comprising an output amplifier circuit connected to the line, first means for generating a compensation voltage proportional to a common mode voltage occurring on the line and for providing a direct current proportional to a DC component of the line current, second means for obtaining a constant current, for algebraically summing said constant current and said direct current, and for supplying to the output amplifier circuit a first control current equal to said algebraic sum of the constant current and the direct current, third means for providing from said compensation voltage, via two connecting wires and on each wire, a second control current to the output amplifier circuit so as to compensate for longitudinal currents on the line, each connecting wire carrying the first control current and the output amplifier circuit delivering on each line wire a current proportional to the algebraic sum, on each connecting wire, of the first and second control currents, and an interface circuit connected to the first means and to the telephone exchange.

REFERENCES:
patent: 3823273 (1974-07-01), Beeman et al.
patent: 4004109 (1977-01-01), Boxall
patent: 4272656 (1981-01-01), Nishikawa
patent: 4300023 (1981-11-01), Kelley et al.
patent: 4476350 (1984-10-01), Aull et al.
IEEE Journal of Solid State Electronics, vol. SC-16, No. 4, Aug. 1981, Aull et al., pp. 261-265, "A High Voltage IC for a Transformerless Trunk and Subscriber Line Interface".
IEEE Journal of Solid State Electronics, vol. SC-16, No. 4, Aug. 1981, David P. Laude, pp. 266-269, "A Monolithic Subscriber Line Interface Circuit".
IEEE Journal of Solid States Circuits, vol. SC-16, No. 4, Aug. 1981, W. D. Pace, "A Monolithic Telephone Subscriber Loop Interface Circuit", pp. 270-278.

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