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A proposal is presented for the interworking of preassignment and demand-assignment communication systems in future worldwide telephone networks. Considering the current and future worldwide traffic volume, the possible communication systems, especially the possible multiple-access systems, are compared. As a result, restoring the existing preassigned network by a time-division multiple-access system with demand-assigned channels appears most suitable for handling the Atlantic region traffic in 1975. The proposed interworking of the different systems will be explained with the aid of a simple network model.