Integrated circuitry for exchanging signals between telephone st

Details Integrated circuitry for exchanging signals between telephone st Integrated circuitry for exchanging signals between telephone st

1979-05-30

1981-09-01

Konick, Bernard

179 18FA, 179 70, 179170NC, H04M 322

Patent

active

042873924

ABSTRACT:
The two talking wires of a line loop extending from a subscriber station to a central office, provided with respective blocking capacitors, are connected on the subscriber side of these blocking capacitors to respective signal detectors fed from a common battery and cross-coupled by a common compensating capacitor. The two signal detectors receive outgoing signals from the central-office equipment via a common photoelectric coupler and transmit incoming signals to that equipment by way of respective bistable threshold comparators and individal photoelectric couplers. The two signal detectors with their threshold comparators are constituted in integrated circuity by mutually complementary transistors and diodes together with associated resistors.

REFERENCES:
patent: 3410961 (1968-11-01), Slana
patent: 3783194 (1974-01-01), Couch
patent: 3848094 (1974-11-01), Russell
patent: 3914556 (1975-10-01), Frazee
patent: 4086447 (1978-04-01), Schindler et al.
patent: 4087646 (1978-05-01), Brolin et al.
patent: 4088843 (1978-05-01), Rogers et al.
patent: 4142075 (1979-02-01), Olschewski
patent: 4228323 (1980-10-01), Feiner et al.
A. R. Potter & N. T. Thurlow, "Coding and Signal Interfacing for a Digital Local Exchange", Post Office Research Center, 1976.
H. Schindler & P. Vettiger, "Optocoupler-Based Extension/Subscriber-Line Circuit", IBM Zurich Research Laboratory.
H. Gessler & F. Riolo, "Practical Examples of Signalling Conversion at the Interface between PCM System and Electromechanical Switching Equipment", Hasler Ltd.

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