Subscriber telephone line interface circuit with reduced power s

Details Subscriber telephone line interface circuit with reduced power s Subscriber telephone line interface circuit with reduced power s

1986-02-12

1987-11-24

Rubinson, Gene Z.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379345, H04M 1900

Patent

active

047093889

ABSTRACT:
A subscriber telephone line interface circuit is provided with reduced power stand-by mode. For 90% of the time such circuits only have a function of monitoring the line. Means are described for considerably reducing the power consumption of the circuit during such monitoring periods. The reduction is provided essentially by modifying the construction of the output stages connected to the telephone line; these stages become generators of a fixed voltage for biasing the line when the circuit is in monitoring mode.

REFERENCES:
patent: 4130735 (1978-12-01), Chambers, Jr. et al.
patent: 4387273 (1983-06-01), Chea, Jr.
patent: 4567331 (1986-01-01), Martin
IEEE Journal of Solid-State Circuits, vol. SC-16, No. 4, Aug., 1981, pp. 261-266, IEEE, New York, US; D. W. Aull et al.: "A High-Voltage IC for a Transformerless Trunk and Subscriber Line Interface", p. 261, colonne de droite, ligne 21-p. 264, colonne de droite, ligne 8.
IEEE Journal of Solid-State Cirucits, vol. SC-18, No. 3, Jun. 1983, pp. 316-324, IEEE, New York, US; J. M. Dannells et al.: "Monolithic 70 V Bipolar Line-Driver IC for PCM SLIC", p. 318, colonne de droite, ligne 3-p. 322, colonne de dreoite, ligne 13.
IBM Technical Disclosure Bulletin, vol. 26, No. 4, Sep. 1983, pp. 2033-2035, New York, US; Y. Bonnet et al.: "Feeding Circuit with Reduced Power Consumption", en entier.

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