Digital signal transmitting circuit for telephone network

Details Digital signal transmitting circuit for telephone network Digital signal transmitting circuit for telephone network

1987-11-13

1989-02-14

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

375 71, 307279, H04M 1106

Patent

active

048052140

ABSTRACT:
A circuit is disclosed for the transmission of digital signals on a bifilary line, especially a telephone line. The circuit disclosed is a so-called S interface circuit which has to produce digital signals within certain set limits. The proposed circuit uses four differential amplifiers, each controlling an output transistor (N-channel MOS transistors and P-channel MOS transistors). The amplifiers receive feedback to maintain the overvoltages within acceptable limits. The invention applies especially to the setting up of integrated service digital telephone networks.

REFERENCES:
patent: 4164842 (1979-08-01), Ebihara
patent: 4211896 (1980-07-01), Ferrieu
patent: 4412141 (1983-10-01), Jacobsen
Patent Abstracts of Japan, vol. 7, no. 284 (E-217)[1429], Dec. 17,1983; & JP-A-58 162 128 (Matsushita Denko K.K.) 26-09-83 *Resume*.

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