Field experience with custom LSI chip set for ISDN

An effective, modular, and flexible chip-set concept for integrated services digital networks (ISDNs) has been developed using functional partitioning at board and integrated-circuit level based on the distributed architecture of System 12. As System 12 can handle both speech and data connection with equal ease, the only enhancements needed to provide ISDN service are new peripheral modules for packet-oriented services. System tests and field experience have shown that the development and quality strategy is correct. The predicted performance reliability and availability were reached. The key to successful ISDN is the high integration of the major function in VLSI technology