Subscriber line interface circuit with power-down mode

Telephonic communications – Subscriber line or transmission line interface

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379413, H04M 100

Patent

active

RE0355828

ABSTRACT:
A method of lowering the power absorbed by an interface circuit, in the "power-down" state thereof, as incorporated to a telephone exchange and connected to a telephone subscriber line, being of a type which comprises a monitoring circuit portion connected between the line and the exchange. The method involves the steps of,

REFERENCES:
patent: 4419542 (1983-12-01), Embree et al.
patent: 4908856 (1990-03-01), Poletto
SGS-Thomson Microelectronics, L3000, L3010, L3121, A Kit of Solid State Devices for Integrating The Subscriber Line Interface Circuit, Jun., 1986, 633-664.

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