2,902 research outputs found

    Priorities and Pay Function Routing for a Packet Switching Network

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    In every network there arises the problem of choosing a path for a message so that it reaches its destination. If there are many users requesting the same channel it could be occupied and another would have to be chosen, provided that it would also be a good path and free, otherwise the message would have to queue up. The choice of an objective function for the selection procedure of a path is part of the decision process when constructing the routing algorithm. The selection is carried out with respect to an objective function which is maximized (or minimized). There exist some useful objective functions commonly used for routing in a computer network: minimization of distance, minimization of delay or cumulative costs, maximization of throughput or reliability, etc

    Quality of Service challenges for Voice over Internet Protocol (VoIP) within the wireless environment

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    Performance study of voice over frame relay : a thesis presented in partial fulfilment of the requirements for the degree of Master of Engineering in Information Engineering, Massey University, Albany, New Zealand

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    Frame Relay (FR) represents an important paradigm shift in modern telecommunication. This technology is beginning to evolve from data only application to broad spectrum of multimedia users and potential to provide end users with cost effective transport of voice traffic for intra office communication. In this project the recent development in voice communication over Frame relay is investigated. Simulations were carried out using OPNET, a powerful simulation software. Following the simulation model, a practical design of the LAN-to-LAN connectivity experiment was also done in the Net Lab. From the results of the simulation, Performance measures such as delay, jitter, and throughput are reported. It is evident from the results that real-time voice or video across a frame relay network can provide acceptable performance

    Applications of satellite technology to broadband ISDN networks

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    Two satellite architectures for delivering broadband integrated services digital network (B-ISDN) service are evaluated. The first is assumed integral to an existing terrestrial network, and provides complementary services such as interconnects to remote nodes as well as high-rate multicast and broadcast service. The interconnects are at a 155 Mbs rate and are shown as being met with a nonregenerative multibeam satellite having 10-1.5 degree spots. The second satellite architecture focuses on providing private B-ISDN networks as well as acting as a gateway to the public network. This is conceived as being provided by a regenerative multibeam satellite with on-board ATM (asynchronous transfer mode) processing payload. With up to 800 Mbs offered, higher satellite EIRP is required. This is accomplished with 12-0.4 degree hopping beams, covering a total of 110 dwell positions. It is estimated the space segment capital cost for architecture one would be about 190Mwhereasthesecondarchitecturewouldbeabout190M whereas the second architecture would be about 250M. The net user cost is given for a variety of scenarios, but the cost for 155 Mbs services is shown to be about $15-22/minute for 25 percent system utilization

    Cost Effective Routing Implementations for On-chip Networks

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    Arquitecturas de mĂșltiples nĂșcleos como multiprocesadores (CMP) y soluciones multiprocesador para sistemas dentro del chip (MPSoCs) actuales se basan en la eficacia de las redes dentro del chip (NoC) para la comunicaciĂłn entre los diversos nĂșcleos. Un diseño eficiente de red dentro del chip debe ser escalable y al mismo tiempo obtener valores ajustados de ĂĄrea, latencia y consumo de energĂ­a. Para diseños de red dentro del chip de propĂłsito general se suele usar topologĂ­as de malla 2D ya que se ajustan a la distribuciĂłn del chip. Sin embargo, la apariciĂłn de nuevos retos debe ser abordada por los diseñadores. Una mayor probabilidad de defectos de fabricaciĂłn, la necesidad de un uso optimizado de los recursos para aumentar el paralelismo a nivel de aplicaciĂłn o la necesidad de tĂ©cnicas eficaces de ahorro de energĂ­a, puede ocasionar patrones de irregularidad en las topologĂ­as. AdemĂĄs, el soporte para comunicaciĂłn colectiva es una caracterĂ­stica buscada para abordar con eficacia las necesidades de comunicaciĂłn de los protocolos de coherencia de cachĂ©. En estas condiciones, un encaminamiento eficiente de los mensajes se convierte en un reto a superar. El objetivo de esta tesis es establecer las bases de una nueva arquitectura para encaminamiento distribuido basado en lĂłgica que es capaz de adaptarse a cualquier topologĂ­a irregular derivada de una estructura de malla 2D, proporcionando asĂ­ una cobertura total para cualquier caso resultado de soportar los retos mencionados anteriormente. Para conseguirlo, en primer lugar, se parte desde una base, para luego analizar una evoluciĂłn de varios mecanismos, y finalmente llegar a una implementaciĂłn, que abarca varios mĂłdulos para alcanzar el objetivo mencionado anteriormente. De hecho, esta Ășltima implementaciĂłn tiene por nombre eLBDR (effective Logic-Based Distributed Routing). Este trabajo cubre desde el primer mecanismo, LBDR, hasta el resto de mecanismos que han surgido progresivamente.Rodrigo MocholĂ­, S. (2010). Cost Effective Routing Implementations for On-chip Networks [Tesis doctoral no publicada]. Universitat PolitĂšcnica de ValĂšncia. https://doi.org/10.4995/Thesis/10251/8962Palanci

    CLASS-DEPENDENT ROUTING IN SWITCHED COMPUTER NETWORKS

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    Information Systems Working Papers Serie
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