Customer Access Protocols to Integrated Services Digital Networks

摘要

Trends in the conception of local digital networks offering a variety of services including data and telephony are presented, and the interaction between customer access protocols and network architectures discussed. The basic features of a customer-to-network signalling scheme are presented which allow the full treatment of circuit-switched data calls at 64 kbit/s by the Pulse Code Modulation (PCM) local and trunk exchanges and the processing of packet switched data calls by specialized network nodes accessed on demand via the PCM facilities.