This paper presents an overview of the 5ESS 7 " system architecture. The administrative, communications, and switching modules are described, together with an overall view of the software architecture. Operations and maintenance aspects and a short discussion of evolutionary trends are covered.

This paper describes the evolution and architecture of the Stored Program Controlled (spc) Network. The critical role of common‐channel interoffice signaling (ccis) is discussed, both as an improved method for providing the traditional signaling functions, and as the key to a wide range of new service opportunities. These are made possible by the ability to interrupt call progress and, in real‐time, interrogate a distant data base and modify the subsequent call handling based on the information returned. The underlying architecture by which these services are implemented is based on the objectives of providing ubiquitous service with limited deployment of essential network capabilities and creating a structure which permits customized services by modifying the contents of a centralized data base.

This paper presents an overview of the 1A Processor in terms of objectives, design philosophy, major features, and applications in the Bell System. It also serves as an introduction to the detailed technical papers that follow.

This paper presents an overview and introduction to the detailed technical papers that describe the Traffic Service Position System No. 1B. The objectives and design philosophy are discussed and the overall organization of the system is described.

This paper presents an overview of the Traffic Service Position System No. 1 in terms of the objectives and design philosophy of the new features that have been continuously added to the system since its initial introduction into service in the Bell System. It also serves as an introduction to the detailed technical papers that follow.