The purpose is to document the functional requirements and detailed specifications for the Inter-Computer Communications Services (ICCS) of the Advanced Information Processing System (AIPS). An introductory section is provided to outline the overall architecture and functional requirements of the AIPS and to present an overview of the ICCS. An overview of the AIPS architecture as well as a brief description of the AIPS software is given. The guarantees of the ICCS are provided, and the ICCS is described as a seven-layered International Standards Organization (ISO) Model. The ICCS functional requirements, functional design, and detailed specifications as well as each layer of the ICCS are also described. A summary of results and suggestions for future work are presented. Burkhardt, Laura and Masotto, Tom and Sims, J. Terry and Whittredge, Roy and Alger, Linda S. Unspecified Center NASA-CR-187556, NAS 1.26:187556 NAS1-18565; RTOP 506-46-21-56...

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The Advanced Information Processing System (AIPS) is a multi-computer architecture composed of hardware and software building blocks that can be configured to meet a broad range of application requirements. The hardware building blocks are fault-tolerant, general-purpose computers, fault-and damage-tolerant networks (both computer and input/output), and interfaces between the networks and the computers. The software building blocks are the major software functions: local system services, input/output, system services, inter-computer system services, and the system manager. The foundation of the local system services is an operating system with the functions required for a traditional real-time multi-tasking computer, such as task scheduling, inter-task communication, memory management, interrupt handling, and time maintenance. Resting on this foundation are the redundancy management functions necessary in a redundant computer and the status reporting functions required for an operator interface. The functional requirements, functional design and detailed specifications for all the local system services are documented. Burkhardt, Laura and Alger, Linda and Whittredge, Roy and Stasiowski, Peter Unspecified Center ARCHITECTURE (COMPUTERS); COMPUTER NETWORKS; FAULT TOLERANCE; INFORMATION SYSTEMS; MULTIPROCESSING (COMPUTERS); REDUNDANCY; COMPUTER SYSTEMS DESIGN; MODULARITY; OPERATING SYSTEMS (COMPUTERS)...