20 Hz Ringdown solid state two-wire/four-wire converter

Details 20 Hz Ringdown solid state two-wire/four-wire converter 20 Hz Ringdown solid state two-wire/four-wire converter

1976-10-04

1977-07-19

Claffy, Kathleen H.

H04B 158

Patent

active

040370658

ABSTRACT:
A hybrid system utilizing a plurality of operational amplifiers provides for appropriate isolation of input and output signalling. A signal initially appearing at the incoming path of the four-wire line appears as a balanced signal at the two-wire input/output end of the system but is effectively canceled from appearing at the ouput path of the four-wire input/output end. A signal initially placed on the two-wire input/output end of the system appears at the output of the four-wire input/output end but is effectively canceled from the input line of the four-wire input/output end. A 20 Hz threshold detector senses signals from the two-wire input/output line.

REFERENCES:
patent: 3530260 (1970-09-01), Gaunt, Jr.
patent: 3855430 (1974-12-01), Colardelle et al.
patent: 3973089 (1976-08-01), Puckette
M. A. Patten; "Electronic Hybrid Telephone Line Pack;" IBM Tech. Disclosure ulletin; vol. 16, No. 4; Sept. 1973; pp. 1173-1174.

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