DIENSTINTEGRIERTES NACHRICHTENUEBERTRAGUNGS- UND VERMITTLUNGSSYSTEM FUER TON, BILD UND DATEN

摘要

A service integrated communications transmission and switching system for audio, video and data, between a user terminal and a central switching station of a telephone system wherein the line connecting the user terminal with the switching station includes at most one light-conductive fiber which is utilized in wave multiplex duplex operation for the transmission and reception of signals from and to the user terminal; the narrowband services are provided by means of digital transmission with analog to digital and digital to analog conversion and multiplex and demultiplex taking place at the user end; and the broadband services are provided by means of analog transmission.