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.
This paper provides an overview to the theme of this issue, the software‐development process; i.e., the integration of practices, technology, and platforms into an environment for the development of software products. With a well‐defined software‐development process, an organization can optimize its development intervals, minimize costs, and maximize performance. In this paper, we describe the work going on in some AT&T business units to define and improve the process of software development and, thereby, shorten the time to market for products and improve product quality. In particular, we focus on two projects that provide mechanisms organizations can use to achieve and measure improvement in their software‐development processes. These mechanisms emphasize the process and its components. By using these mechanisms, a software‐development organization can choose the most appropriate practices, technology, and platforms to support its processes and measure the results of using these choices. Thus, the organization can quickly become process focused and reap the benefits of this approach to software development.
The Remote Switching System (RSS)
The No. 10A Remote Switching System (RSS) has brought a new dimension to telephone switching in the rural area. The capability to host a 10A RSS was first made available on the metropolitan switches, the No. 1 and No. 1A ESS. The capability has now been extended to the suburban switch, the No. 2B ESS. This article describes the additions and modifications made to the No. 2B ESS to allow it to host the 10A RSS. The discussion also covers the administrative and maintenance features provided and their associated host software implementation.
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