In accordance with the principles of this invention, Pulse Code Modulation (PCM) signal streams are converted into Asynchronous Transfer Mode (ATM) cells for switching and transmission across a telecommunications network. Each cell carries one PCM sample of up to 48 different voice connections, the voice...http://www.google.de/patents/US5345445?utm_source=gb-gplus-sharePatent US5345445 - Establishing telecommunications calls in a broadband network
