Four-wire terminating circuit

Details Four-wire terminating circuit Four-wire terminating circuit

1981-05-22

1983-11-29

Rubinson, G. Z.

179170T, H04B 158

Patent

active

044182490

ABSTRACT:
A four-wire termination circuit has a series arrangement of a current source controlled by a transmitting arm of a four-wire line and a first resistor. This arrangement is connected in parallel to a two-wire line terminal impedance formed by a second resistor and an impedance. The terminal impedance terminates the two-wire line in reflection-free fashion. Voltages dependent upon a transmitted signal current which are equal in value but opposed in phase appear across the first and second resistors. A voltage which is dependent upon a received signal current from the two-wire line appears across the second resistor. In a receiving arm of the four-wire line, an intermediate value voltage is present which is independent of the transmitted signal in the transmitting arm.

REFERENCES:
patent: 3453395 (1969-07-01), Englund, Jr.
patent: 3529099 (1970-09-01), Ribner
patent: 3751602 (1973-08-01), Breeden
patent: 3823272 (1974-07-01), Tabalba
patent: 4228323 (1980-10-01), Feiner et al.
patent: 4302636 (1981-11-01), Dumont et al.
Frequenz 28 (1974) 5, Article entitled "Applications of Adaptive Control in Transmission Systems" by Von Karl Heinz Mohrmann.
Agard Conference Proceedings No. 103, pp. 12-1 through 12-16, Article entitled "The Adaptive Equalization of Transmission Systems" by K. H. Moehrmann.
Page 15 of Siemens publication "Druckschrift PCM--Die Pulscode--Modulation und ihre Anwendung im Fernmeldewesen", published 1970.
Appel & Abramson; "Electronic Hybrid for Telephone Using a Differential Amplifier"; IBM Technical Disclosure Bulletin; Oct. 1973; pp. 1513-1514.

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