Telephone line interface

Details Telephone line interface Telephone line interface

1980-12-08

1982-08-17

Robinson, Thomas A.

179 16F, 179 81R, H04M 100, H04Q 1104, H04B 336

Patent

active

043451152

ABSTRACT:
A telephone subscriber's line interface for a system in which the telephone instrument and the connections therefrom to the exchange use analogue, while the exchange is digital is described, in which electro-mechanical components are eliminated.
To achieve this a microprocessor serves a group of lines on a multiplexed basis, responding to conditions of the line as determined via a high impedance monitor and analogue-to-digital conversion means. It also responds to control inputs from the rest of the exchange. In response to the above inputs it controls line feed, signalling, etc. via digital-to-analogue conversion means and a line driver.

REFERENCES:
patent: 4261051 (1981-04-01), Ohnishi et al.
patent: 4268723 (1981-05-01), Taylor

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