This article describes the system organization and objectives of the No. 1 Electronic Switching System Arranged with Data Features. The new hardware and software designs required to adapt a No. 1 ESS to a store and forward system are outlined with emphasis on the techniques used to get large system capacity, continuous reliable operation, and flexible service features. System operation, traffic capacity, and use of the new system are also discussed in this introduction to seven detailed articles.
This paper outlines a process for determining performance levels for new voice and data communication services using checklists and mathematical models. Models that help define acceptable performance for a new service can be set up using information and measurements on service user needs and practices and on service user experience with alternative services and similar services.
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