Study Project for an Integrated Digital Local Network.

Following an analysis of the motivations leading to the extension of digital transmission and switching techniques the local telecommunication network solutions for the location of the analogue/digital interface are compared. The goals and the frame of a study project for a fully digital local network are outlined. The chosen structure includes digital (PCM) subscriber sets connected each with a bidirectional digital line to concentrators. The restricted-autonomy concentrators are linked with the digital local exchange over a 30-channel multiplex PCM link.