Showing papers on "Network management published in 1981"

Network Management and Congestion in the U.S. Telecommunications Network

Abstract: Several significant steps have been taken to respond to the need for better network management for the evolving U.S. telecommunications network. The current approach provides an economical balance between automatic and manual network management capabilities. With the rapid introduction of Stored Program Controlled (SPC) switching systems and the Common Channel Interoffice Signaling (CCIS) system, more emphasis is being placed on continued improvement in automatic controls. Advances in manual network management controls and real-time surveillance capabilities have been accomplished primarily through the introduction of computer-based systems which support the operation of centralized Network Management Centers (NMC's). Also, new controls are introduced for forthcoming SPC-CCIS network services. The evolution, status, and future needs for network management of the coterminous U.S. telecommunications network are presented. An extensive bibliography is given.

Network problem-determination aids in microprocessor-based modems

Abstract: Recent significant developments in large-scale integration (LSI) and in digital signal-processing techniques have combined to provide the base for a new generation of modems. LSI microprocessors now have the characteristics and performance to provide superior modem function as well as a design base for the addition of new function. The extendability afforded by a microprocessor-based modem design is being increasingly used to provide advanced communications network management functions. This paper describes the design objectives, implementation decisions, and design rationale for implementing these characteristics in the IBM 3863, 3864, and 3865 family of data modems. This network management function, which has been integrated into IBM Communications Network Management (CNM) offerings for IBM's Systems Network Architecture user networks, extends the problem-determination capability to cover the modems and communications lines. Support for this new function has been integrated into the 3705 ACF/NCP/VS control program and the System/370 NPDA program product.

Theory of Flow Control in Shared Networks and Its Application in the Canadian Telephone Network

Abstract: A shared network is largely oversubscribed by independent users who make random demands on the network. Network flow control is required for the orderly operation of the network under all potential traffic loads. This paper presents a qualitative analysis of the theory of flow control to circuit-switched and packet-switched networks and pro- ,. poses 4 complementary controls and 1 subtended control to constitute "flow control." They are traffic control, routing and delay control, congestion control, network management control, and end-end flow control. This paper introduces the concept of the "R-T function" to illustrate the synthesis of delays and routing freedoms, and to demonstrate the continuum between overload and congestion phenomena. The application of the qualitative theory of flow control to the Canadian Telephone Network is reviewed and the agreement between the theory and the practice is demonstrated. The telephone network is a prime example of a circuit-switched network which has received the benefit of extensive simulation and analytical studies, as well as a long experience to validate the conclusions reached in this paper.