For several years, Fujitsu has been researching and developing high-speed packet switching networks, the result being an integrated multimedia information networks architecture. This architecture has already been applied to LAN systems and can now be applied to wide area corporate networks thanks to the new developments described in this paper. The most important technology-the bus matrix switch-provides a quantum leap in processing capacity up to several Gbit/s (few millions of packets every second), while keeping a very low switching delay. The performance evaluation based on our prototype models is also considered in detail. For example, a voice delay of less than 20 ms is obtained for five-hop communication. The new technologies will greatly improve for computer networks and will also enable basic and broadband ISDN.

This paper describes a new integrated service network using packetized voice/data technology which was developed in consideration of the sophisticated service demands for voice, data, and facsimile communication. A major problem in constructing this network is in the local distribution network, i.e., the subscriber interface unit, the local end office, and the subscriber loop which connects them. The concepts, choice of design parameters, and laboratory test results of the packetized service integration network are briefly discussed.