Abstract
The introduction of new telecommunication services in modern networks requires the development of appropriate network concepts. In this paper new concepts of integrated-service TDM communication systems are presented based on message switching. Within these networks with loop structure, line structure or branched structure decentralized switching is applied. The message routing principle optimizes the network transmission capacity and its functional reliability in case of disturbances such as cable flaws and component failures. In particular in networks with integrated broadband services a favourable utilization of the transmission capacity is important. These network features are attained by a multiple utilization of a channel by simultaneous independent connections. The network structures and the system component design are explained. Results of a comparison between the proposed and known systems are given. The networks presented offer an improved channel utilization by an amount of four. Additionally a good security against disturbances and tapping is obtained.