In developing the 5ESS™ switching system, a digital switch with distributed control, major emphasis has been placed on reliability, quality of service to the customer, and efficiency of the human interface for the telephone operating companies. To achieve a high-reliability design for this system, a robust hardware/software architecture has been developed with emphasis on a net working approach to functional maintenance organization. Building on this approach, a highly effective set of capabilities is provided for the detection and sectionalization of errors, and for recovery from software and hardware faults. Complete diagnostic aids are available, and flexible video display terminals provide an efficient and attractive means for telephone operating company personnel to interface to the system. Further, a wide range of automated, as well as manual, trunk and line test features are integrated into the system design; and interfaces to both local work stations and operational support systems provide a variety of options for efficient maintenance operation.

The flying spot store is a versatile and efficient semipermanent information storage system developed for 1/,se in the electronic telephone switching system. Because of the form of the store, many variables enter into system design. In this paper the factors which control speed, capacity, number of channels, physical size and probability of error in readout are discussed. It is shown that these factors are related to the intended application for the store, to the form of the store and to device parameters. A number of scaling operations which involve exchanges between system parameters such as speed and capacity or between system and device parameters are given.

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This paper is an introduction to a series of detailed technical articles that describe the remreed switching network for No. 1 and No. 1A ESS. The developmental background, technological advances, design constraints and guidelines, objectives, advantages and status of the remreed network are outlined.