Separation and balance device for telephone exchanges

Details Separation and balance device for telephone exchanges Separation and balance device for telephone exchanges

1979-09-14

1981-09-29

Konick, Bernard

H04B 158

Patent

active

042924790

ABSTRACT:
The invention relates to automatic outgoing and incoming channel balance and separation circuits between local telephone set lines and network junctors. The separation circuit associated with the telephone set lines possesses an electronic line feed circuit and a separator constituted by an operational amplifier whose output is connected via two equal resistors in series to one of the outputs of the electronic supply circuit, the junction of these two resistors being connected to the output of this separation circuit. The separation circuit associated with the junctor possesses two input amplifiers connected to the network via output resistors of equal value, one terminal of one of these output resistors being connected via a passive resistive and capacitative network to an operation amplifier, and the other terminal of this resistor being connected via a single resistor to this operational amplifier. Balance is provided for given values of the passive network components and for a given value of line impedance seen by the first separation circuit. The device possesses no adjustable components or transformers, and can be easily produced as an integrated circuit.

REFERENCES:
patent: 3689710 (1972-09-01), Colardelle et al.
patent: 3973089 (1976-08-01), Puckette
patent: 4034166 (1977-07-01), Hollis
patent: 4041252 (1977-08-01), Cowden
patent: 4053722 (1977-10-01), Nahay
J. R. Sergo, Jr.; "DSS Quad Line Circuit"; The International Symposium on Subscriber Loops and Services Conference Record; Mar. 1978.
D. E. Fisk and M. E. Homan; "Balanced Electronic Hybrid Circuits"; IBM Technical Disclosure Bulletin; vol. 16, No. 2; Jul. 1973; pp. 495, 496.

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