PSROUTE: AN INTERACTIVE DESIGN TOOL FOR SELECTING ROUTES IN DATA COMMUNICATION NETWORKS

This paper describes a prototype interactive design tool, PSROUTE, that can be used by designers of data communication networks for selecting primary and secondary routes for every pair of communicating nodes in a network. The objective in selecting routes is to minimize the mean delay faced by messages. The problem was previously modeled as a mathematical programming problem (Pirkul and Narasimhan 1987). PSROUTE allows the user to interactively specify various network and traffic parameters and observe the effects on the solution. The solution can be examined in detail so that the designer can modify the parameters based on his judgment and then use PSROUTE to repeatedly execute the solution procedure until a satisfactory solution is reached

A land mobile satellite data system

The Telesat Mobile Incorporated (TMI) Mobile Data System (MDS) was developed to apply satellite technology to the transportation industry's requirement for a fleet management system. It will provide two-way messaging and automatic position reporting capabilities between dispatch centers and customers' fleets of trucks. The design was based on the Inmarsat L-Band space segment with system link parameters and margins adjusted to meet the land mobile satellite channel characteristics. The system interfaces with the Teleglobe Des Laurentides earth station at Weir, Quebec. The signaling protocols were derived from the Inmarsat Standard C packet signalling system with unique trucking requirements incorporated where necessary

A Proposal for the Development of Computer Networking Facilities at IIASA and the IIASA Network Project

As a result of meetings with Computer Institutions in Hungary and Czechoslovakia, it has become clear that there exists a concrete opportunity to establish the basis of a Computer Network available as a direct communication resource to IIASA Scientists. That there is a need for Data Communication facilities has become increasingly obvious, as a direct result of the difficulties experienced in exchanging information between IIASA and the NMOs, and between the NMOs themselves. In accordance with the aims of the project to improve and facilitate cooperation between IIASA and Home Institutions a proposal for a preliminary computer network has been drawn~ up, which will enable IIASA projects to make pilot studies in cooperation with remote centres. It will also provide the necessary experience to expand and improve such communication. The latter is important to the decentralization of IIASA research and to the widening of its sphere of influence. The proposal is one for joint participation with the Computer and Automation Institute in Budapest, and the United Nations Computing Research Centre in Bratislava. The costs would be shared equally between all three participants, and each would supply computer time and the necessary man power

Stuttgart Interconnection Network Project from PIX to NICS

The PIX follow-up project NICS is described. The purpose of PIX was access to X.25, the DATEX-P network of the Federal German Post Office. The development and implementation of higher protocols for levels 4-7 in the ISOSINN was the actual problem here. Results of the PIX project are given. NICS (Stuttgart Interconnection Network Project) is presented. International Protocols are reviewed. PAD service is described, which allows terminal access to DATEX-P network of the Federal German Post Office

Domestic mobile satellite systems in North America

Telest Mobile Inc. (TMI) and the American Mobile Satellite Corporation (AMSC) are authorized to provide mobile satellite services (MSS) in Canada and the United States respectively. They are developing compatible systems and are undertaking joint specification and procurement of spacecraft and ground segment with the aim of operational systems by late 1993. Early entry (phase 1) mobile data services are offered in 1990 using space segment capacity leased from Inmarsat. Here, an overview is given of these domestic MSS with an emphasis on the TMI component of the MSAT systen

Congestion control in interconnected computer networks

Ankara : The Department of Computer Engineering and Information Sciences and the Institute of Engineering and Sciences of Bilkent Univ. , 1988.Thesis (Master's) -- Bilkent University, 1988.Includes bibliographical references leaves 62-65.A computer network has a collection of resources shared by multiple users. The capacity of the resources is limited, and if the user demands exceed the capacity, the network becomes ’congested’. The congestion causes a degradation in system performance. In interconnected networks there are two classes of traffic within a network. One class is the local traffic that is generated and transmitted within the network. The other class is the internetwork traffic transmitted to or from other networks. In this thesis, the effect of internetwork traffic on the performance of a network is investigated. Computer simulation of an interconnected network model is provided in order to evaluate the effectiveness of a window-based congestion control mechanism on preventing congestion in gateways and in attached networks caused by the overload of internetwork traffic. Also two dynamic window congestion control algorithms are provided and studied. These algorithms provide further control to window mechanism by adjusting the window size in accordance with the availability of the network resources at the destination. Dynamic algorithms are evaluated comparing them with static window control.Ulusoy, ÖzgürM.S

Flow control and routing techniques for integrated voice and data networks

Bibliography: p.25-26."October 1981""ARPA Grant No. N00014-75-C-1183"Oliver C. Ibe

The IIASA Data Communication Network

This paper presents IIASA Computer Science Project plans for the construction of a computer-computer network connecting centers in National Member Countries

Earth and environmental science in the 1980's: Part 1: Environmental data systems, supercomputer facilities and networks

Overview descriptions of on-line environmental data systems, supercomputer facilities, and networks are presented. Each description addresses the concepts of content, capability, and user access relevant to the point of view of potential utilization by the Earth and environmental science community. The information on similar systems or facilities is presented in parallel fashion to encourage and facilitate intercomparison. In addition, summary sheets are given for each description, and a summary table precedes each section

Survey of Routing Algorithms for Computer Networks

This thesis gives a general discussion of routing for computer networks, followed by an overview of a number of typical routing algorithms used or reported in the past few years. Attention is mainly focused on distributed adaptive routing algorithms for packet switching (or message switching) networks. Algorithms for major commercial networks (or network architectures) are reviewed as well, for the convenience of comparison