Thèses : « Asynchronous Transfer Mode (ATM) networks »

1

Crosby, Simon Andrew. « Performance management in ATM networks ». Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285357.

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Seferidis, Vassilis Emmanuel. « Video coding for ATM networks ». Thesis, University of Essex, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333486.

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Joe, Inwhee. « Error control for wireless ATM networks ». Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/15643.

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Dutkiewicz, Eryk. « Connection admission control in ATM networks / ». Title page, abstract and contents only, 1991. http://web4.library.adelaide.edu.au/theses/09SM/09smd976.pdf.

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Fan, Zhong. « Some aspects of traffic control and performance evaluation of ATM networks ». Thesis, Durham University, 1997. http://etheses.dur.ac.uk/4768/.

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The emerging high-speed Asynchronous Transfer Mode (ATM) networks are expected to integrate through statistical multiplexing large numbers of traffic sources having a broad range of statistical characteristics and different Quality of Service (QOS) requirements. To achieve high utilisation of network resources while maintaining the QOS, efficient traffic management strategies have to be developed. This thesis considers the problem of traffic control for ATM networks. The thesis studies the application of neural networks to various ATM traffic control issues such as feedback congestion control, traffic characterization, bandwidth estimation, and Call Admission Control (CAC). A novel adaptive congestion control approach based on a neural network that uses reinforcement learning is developed. It is shown that the neural controller is very effective in providing general QOS control. A Finite Impulse Response (FIR) neural network is proposed to adaptively predict the traffic arrival process by learning the relationship between the past and future traffic variations. On the basis of this prediction, a feedback flow control scheme at input access nodes of the network is presented. Simulation results demonstrate significant performance improvement over conventional control mechanisms. In addition, an accurate yet computationally efficient approach to effective bandwidth estimation for multiplexed connections is investigated. In this method, a feed forward neural network is employed to model the nonlinear relationship between the effective bandwidth and the traffic situations and a QOS measure. Applications of this approach to admission control, bandwidth allocation and dynamic routing are also discussed. A detailed investigation has indicated that CAC schemes based on effective bandwidth approximation can be very conservative and prevent optimal use of network resources. A modified effective bandwidth CAC approach is therefore proposed to overcome the drawback of conventional methods. Considering statistical multiplexing between traffic sources, we directly calculate the effective bandwidth of the aggregate traffic which is modelled by a two-state Markov modulated Poisson process via matching four important statistics. We use the theory of large deviations to provide a unified description of effective bandwidths for various traffic sources and the associated ATM multiplexer queueing performance approximations, illustrating their strengths and limitations. In addition, a more accurate estimation method for ATM QOS parameters based on the Bahadur-Rao theorem is proposed, which is a refinement of the original effective bandwidth approximation and can lead to higher link utilisation.

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Tenruh, Mahmut. « Extending Controller Area Networks : CAN/CAN cut-through bridging, CAN over ATM, and CAN based ATM FieldBus ». Thesis, University of Sussex, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340796.

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Goyal, Rohit. « Traffic management for TCP/IP over Asynchronous Transfer Mode (ATM) networks / ». The Ohio State University, 1999. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488188894438013.

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Zavialov, Alexander. « Distributed failure restoration for asynchronous transfer mode (ATM) tactical communication networks ». Thesis, De Montfort University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.699808.

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Jordan, T. P. « Design and analysis of routing algorithms for ATM networks ». Thesis, De Montfort University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391028.

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Watson, Scott Douglas. « Low and variable bit-rate speech coding for asynchronous transfer mode networks ». Thesis, University of Liverpool, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367239.

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Hernandez, Joaquin Garcia. « Management of the quality of video services in ATM networks ». Thesis, University of Essex, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284604.

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Redey, Akos Laszlo. « A novel routing strategy for public wide area ATM networks ». Thesis, De Montfort University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391340.

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Gao, Chengwei. « Priority statistical multiplexing and two-level congestion control for video transmission over ATM networks / ». Thesis, Connect to this title online ; UW restricted, 1997. http://hdl.handle.net/1773/5889.

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Stipidis, Elias. « ATM networks : traffic control, interworking with CAN, and end station NIC architecture ». Thesis, University of Sussex, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263208.

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Farid, Weam Mohamed. « RAMSIS, a novel multimedia synchronization scheme for asynchronous transfer mode (ATM) networks ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ31571.pdf.

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Zhang, Runcheng. « Simulation study of network performance on the North Carolina information highway ATM network ». Thesis, Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/9126.

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Ors, Tolga. « Traffic and congestion control for ATM over satellite to provide QoS ». Thesis, University of Surrey, 1998. http://epubs.surrey.ac.uk/843458/.

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In broadband multimedia satellite networks it is necessary to multiplex bursty streams of traffic with differing Quality of Service (QoS) requirements to maximise the utilisation of the satellite link bandwidth. Providing the desired QoS of each service, in a multi-service environment is a major challenge for satellite networks. Asynchronous Transfer Mode (ATM) which provides hard QoS guarantees is suitable for a multi-service satellite environment. ATM has been developed as a vehicle for multimedia communications and is widely regarded as one of the most important and fastest-growing communications technology of this decade. The design of suitable traffic and congestion control algorithms is one of the most important challenge for the success of an ATM-based satellite network. This thesis develops and optimises a traffic and congestion control mechanism which can provide users the required QoS for ATM over satellite networks. In order to provide QoS differentiation for end-to-end communication it is proposed to use both loss and delay priorities, which are determined form the required Cell Loss Rate (CLR) and Cell Transfer Delay (CTD) parameters, for each service class. A multiple shared buffer scheduling (MSBS) policy considering both delay and loss priorities, is proposed and evaluated for scheduling and discarding of ATM cells. It is shown that both the CTD and CLR requirements of ATM services can be met by the MSBS scheme. A combined preventive/reactive control scheme incorporating an adaptive Leaky Bucket (LB) is investigated for the satellite environment. It has been found that reactive control improves the cell loss due to congestion for time scales larger than the propagation delay. As the satellite air interface bandwidth is currently one of the most expensive commodities in the service provision, an adaptive MAC protocol that can support the ATM service classes whilst maximising the bandwidth utilisation, is proposed and evaluated. The mapping of ATM service classes to MAC classes and the use of a prioritised request queue provides the QoS differentiation required by ATM networks. It is shown that a pure reservation system performs poorly for very bursty user traffic. The user population which can be supported using Random Access (RA) for very bursty users with short burst duration is higher. The system throughput can be maximised, by making this protocol adaptive to changing traffic characteristics. It is shown that the utilisation of the frame capacity and the total number of users served can be improved by using this protocol.

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Sabaa, Amr Gaber. « Switching and error recovery in terabit ATM networks ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ37362.pdf.

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Wyman, Richard Hayden. « Bit-plane differential EZW for the compression of video for available bit-rate channels ». Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313533.

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Sekercioglu, Ahmet, et ahmet@hyperion ctie monash edu au. « Fuzzy logic control techniques and structures for Asynchronous Transfer Mode (ATM) based multimedia networks ». Swinburne University of Technology, 1999. http://adt.lib.swin.edu.au./public/adt-VSWT20050411.130014.

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The research presented in this thesis aims to demonstrate that fuzzy logic is a useful tool for developing mechanisms for controlling traffc flow in ATM based multimedia networks to maintain quality of service (QoS) requirements and maximize resource utilization. The study first proposes a hierarchical, multilevel control structure for ATM networks to exploit the reported strengths of fuzzy logic at various control levels. Then, an extensive development and evaluation is presented for a subset of the proposed control architecture at the congestion control level. An ATM based multimedia network must have quite sophisticated traffc control capabilities to effectively handle the requirements of a dynamically varying mixture of voice, video and data services while meeting the required levels of performance. Feedback control techniques have an essential role for the effective and efficient management of the resources of ATM networks. However, development of conventional feedback control techniques relies on the availability of analytical system models. The characteristics of ATM networks and the complexity of service requirements cause the analytical modeling to be very difficult, if not impossible. The lack of realistic dynamic explicit models leads to substantial problems in developing control solutions for B-ISDN networks. This limits the ability of conventional techniques to directly address the control objectives for ATM networks. In the literature, several connection admission and congestion control methods for B-ISDN networks have been reported, and these have achieved mixed success. Usually they either assume heavily simplified models, or they are too complicated to implement, mainly derived using probabilistic (steady-state) models. Fuzzy logic controllers, on the other hand, have been applied successfully to the task of controlling systems for which analytical models are not easily obtainable. Fuzzy logic control is a knowledge-based control strategy that can be utilized when an explicit model of a system is not available or, the model itself, if available, is highly complex and nonlinear. In this case, the problem of control system design is based on qualitative and/or empirically acquired knowledge regarding the operation of the system. Representation of qualitative or empirically acquired knowledge in a fuzzy logic controller is achieved by linguistic expressions in the form of fuzzy relational equations. By using fuzzy relational equations, classifications related to system parameters can be derived without explicit description. The thesis presents a new predictive congestion control scheme, Fuzzy Explicit Rate Marking (FERM), which aims to avoid congestion, and by doing so minimize the cell losses, attain high server utilization, and maintain the fair use of links. The performance of the FERM scheme is extremely competitive with that of control schemes developed using traditional methods over a considerable period of time. The results of the study demonstrate that fuzzy logic control is a highly effective design tool for this type of problems, relative to the traditional methods. When controlled systems are highly nonlinear and complex, it keeps the human insight alive and accessible at the lower levels of the control hierarchy, and so higher levels can be built on this understanding. Additionally, the FERM scheme has been extended to adaptively tune (A-FERM) so that continuous automatic tuning of the parameters can be achieved, and thus be more adaptive to system changes leading to better utilization of network bandwidth. This achieves a level of robustness that is not exhibited by other congestion control schemes reported in the literature. In this work, the focus is on ATM networks rather than IP based networks. For historical reasons, and due to fundamental philosophical differences in the (earlier) approach to congestion control, the research for control of TCP/IP and ATM based networks proceeded separately. However, some convergence between them has recently become evident. In the TCP/IP literature proposals have appeared on active queue management in routers, and Explicit Congestion Notication (ECN) for IP. It is reasonably expected that, the algorithms developed in this study will be applicable to IP based multimedia networks as well.

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Sayadian, Edward V. « Video transfer application transport protocol design over ATM networks ». Master's thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-03172010-020223/.

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Lee, Tae-jin. « Traffic management and design of multiservice networks : the Internet and ATM networks / ». Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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Barnes, Brian E. « Real-time resource management for RSVP/ATM edge devices ». Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/15395.

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Azari, Jian. « Transmission of mixed video, speech and data services over ATM networks ». Thesis, University of Essex, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333498.

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Odeh, Abdel-Rahman M. M. « Fault tolerant ATM LAN/LAN internetworking for connectionless data services and their performance evaluation ». Thesis, University of Sussex, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284077.

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Kalyanaraman, Shivkumar. « Traffic management for the available bit rate (ABR) service in asynchronous transfer mode (ATM) networks / ». The Ohio State University, 1997. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487946776020645.

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Bocci, Matthew. « Concurrent cell rate simulation of ATM telecommunications network ». Thesis, Queen Mary, University of London, 1997. http://qmro.qmul.ac.uk/xmlui/handle/123456789/3806.

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Huang, Weimin Carleton University Dissertation Engineering Systems and Computer. « Monitoring and modelling multimedia traffic over TCP/IP/ATM networks ». Ottawa, 1997.

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Jiao, QingZhong. « Admission control and congestion control in ATM/CDMA network ». Thesis, Connect to online version, 1995. http://0-wwwlib.umi.com.mercury.concordia.ca/cr/concordia/fullcit?pMQ90887.

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Jiyapanichkul, Prasit, et jiyapanichkul@yahoo com. « Resource management in broadband multimedia networks ». Swinburne University of Technology. Laboratory for Telecommunication Research, 1999. http://adt.lib.swin.edu.au./public/adt-VSWT20050610.100950.

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This research deals with optimal resource management in an overloaded broadband multimedia network. Optimisation is with respect to user satisfaction, where user satisfaction reflects both the quality of service experienced by connected users and the dissatisfaction of users blocked from access to the network. The research focuses on Asynchronous Transfer Mode (ATM) networks and the Internet, because these are the dominant emerging broadband networks which present some fundamental unsolved problems, related to the sharing of resources between mixed traffic types. ATM networks use conservative admission control, which protects network resources and ensures a high level of service for those admitted to the network, but results in low network efficiency because of low utilisation of resources due to blocking of many potential users. The Internet does not use admission control, with the result that performance degrades progressively as load increases. This causes frustration among users, and lowers the network efficiency due to high levels of congestion. We propose an optimisation model for each network (ATM networks and the Internet)which is intended to represent the distribution and consumption of key network resources by different traffic types. The model is aimed at maximising performance such that users admitted to the network are offered no less than some minimum acceptable level of quality of service (QoS). The solution is a set of traffic flow rates on each path which results in maximising an objective function value (revenue based on network operator interest or throughput based on customer interest) for a given network configuration with given user demand. As an example using the ATM network model, we illustrate the application of the model to an ATM network carrying both connection oriented and connectionless traffic. We explore the optimal response to a link failure which in turn causes node overload. As an example using the Internet model, we consider an overloaded network with link bottlenecks and an overloaded Web server, and explore the effect of transferring some server capacity to a mirror site and a proxy server. For real-time traffic control, the optimisation model is used to assign quotas for bandwidth or connections to selected paths. A control algorithm is implemented to provide maximum performance by admitting requests within the quotas which are obtained from the optimisation model. In an ATM network simulation, the algorithm is used to manage the virtual path (VP) pool in a network which suffers a link failure. A comparison is made between fixed virtual path management (FVPM) and dynamic virtual path management (DVPM), comparing the revenue achieved by each. This illustrates how DVPM adapts the VP pool in a robust fashion to achieve maximum revenue in the face of a link failure. However, the transient response suggests that benefit could be obtained using non-steady-state solutions. The model is extended by taking network state and traffic parameters into account to control changes in the VP pool to recognise limits to the rate at which traffic can be moved (through the natural birth-death processes). This scheme is called state dependent virtual path management (SDVPM). Performance evaluation of the new model shows that SDVPM achieves higher revenue than DVPM when the network suffers a link failure that requires a major change to the VP pool. In an Internet simulation, two algorithms are compared for control of access to a proxy server and a set of primary servers. An algorithm based on optimal flow solutions provides substantially better network performance than a localised heuristic algorithm. In each simulation case (ATM and Internet examples), the performance using a control system based on the steady state optimum flow model is close to the ideal optimal result.

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Deshpande, Nikhil Mukund. « Efficient Buffer Allocation Scheme for Bursty Traffic in ATM Networks using Fast Reservation Protocol ». PDXScholar, 1996. https://pdxscholar.library.pdx.edu/open_access_etds/5237.

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One of the major problems in the realization of ATM is traffic management, in particular, the resource allocation for an efficient network. Many approaches to the bandwidth management problems [2] and buffer management problems have been proposed. Boyer [IO] suggested a "Fast Bandwidth Reservation" protocol, while Turner [2] applied the same technique to the buffer allocation for the bursty traffic. In this thesis, we extend Turner's scheme in order to make it more efficient with respect to buffer allocation. We define a new parameter "Reduction Factor'', which has the potential of saving a significant amount of buffer space in a commonly shared pool of buffers. It is observed that the amount of savings depends upon the cell loss probability (CLP) bound on the network, Source Activity Probability (SAP) and number of connections supported by the network (N) at particular instant. The performance of the scheme is evaluated under various QoS requirements. It is seen that this scheme leads to approximately 38% of savings in the buffer space under certain circumstances. For supporting multimedia services, we also employ the scheme of partitioning the total buffer space. The results show that it leads to 10 % less savings as compared to single buffer scheme under certain conditions. As usage policing is very critical in this scheme, we outline a suitable mechanism and hardware implementation for Usage Parameter Control. The algorithm for acceptance of virtual circuit in the network is also described.

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Zhang, Liren. « Recovery of cell loss in ATM networks using forward error correction coding techniques / ». Title page, contents and summary only, 1992. http://web4.library.adelaide.edu.au/theses/09PH/09phz6332.pdf.

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Thesis (Ph. D.)--University of Adelaide, Dept. of Electrical and Electronic Engineering, 1993.
Copies of author's previously published articles inserted. Includes bibliographical references (leaves 179-186).

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Choi, Myung Cheon. « Traffic flow management for RSVP/ATM edge devices ». Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/15520.

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Chandra, Umesh 1971. « A New Framework for Classification and Comparative Study of Congestion Control Schemes of ATM Networks ». Thesis, University of North Texas, 1996. https://digital.library.unt.edu/ark:/67531/metadc279372/.

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In our work, we have proposed a new framework for the classification and comparative study of ATM congestion control schemes. The different aspects on which we have classified the algorithms are control theoretic approach, action and congestion notification. These three aspects present of the classification present a coherent framework on which congestion control algorithms are to be classified. Such a classification will also help in developing new algorithms.

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Fahmy, Sonia. « Traffic management for point-to-point and multipoint available bit rate (ABR) service in Asynchronous Transfer Mode (ATM) Networks / ». The Ohio State University, 1999. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488191124569846.

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Gossage, Steven A. « Delivery of Very High Bandwidth with ATM Switches and SONET ». International Foundation for Telemetering, 1993. http://hdl.handle.net/10150/608861.

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International Telemetering Conference Proceedings / October 25-28, 1993 / Riviera Hotel and Convention Center, Las Vegas, Nevada
To deliver high bandwidth, a ubiquitous inter-/intra-building cable plant consisting of single mode and multimode fiber as well as twisted pair copper is required. The selection of the "glue" to transport and interconnect distributed LANs with central facility resources over a pervasive cable plant is the focus of this paper. A description of the traditional problems that must be overcome to provide very high bandwidth beyond the narrow confines of a computer center is given. The applicability of Asynchronous Transfer Mode (ATM) switching (interconnection) and Synchronous Optical NETwork (SONET) (transport) for high bandwidth delivery is described using the environment and requirements of Sandia National Laboratories. Other methods for distributing high data rates are compared and contrasted. Sandia is implementing a standards based foundation utilizing a pervasive single mode fiber cable plant, SONET transport, and ATM switching to meet the goals of gigabit networking.

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Natario, Romalho Maria Fernanda. « Application of an automatically designed fuzzy logic decision support system to connection admission control in ATM networks ». Thesis, Queen Mary, University of London, 1996. http://qmro.qmul.ac.uk/xmlui/handle/123456789/3817.

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Chan, Edward. « Supporting heterogeneous traffic in LANs and WANs : issues and techniques ». Thesis, University of Sunderland, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390607.

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Zheng, Jun, et 鄭軍. « Performance analysis and algorithm design for data-driven IP/ATM labelswitching systems ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B3124273X.

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Vandalore, Bobby. « Traffic management to enhance Quality of Service (QoS) of multimedia over Available Bit Rate (ABR) in Asynchronous Transfer Mode (ATM) networks / ». The Ohio State University, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488196234911491.

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Zheng, Jun. « Performance analysis and algorithm design for data-driven IP/ATM label switching systems ». Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22370584.

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Marzo, i. Lázaro Josep Lluís. « Enhanced convolution approach for CAC in ATM networks, an analytical study and implementation ». Doctoral thesis, Universitat de Girona, 1997. http://hdl.handle.net/10803/7715.

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The characteristics of service independence and flexibility of ATM networks make the control problems of such networks very critical. One of the main challenges in ATM networks is to design traffic control mechanisms that enable both economically efficient use of the network resources and desired quality of service to higher layer applications. Window flow control mechanisms of traditional packet switched networks are not well suited to real time services, at the speeds envisaged for the future networks.
In this work, the utilisation of the Probability of Congestion (PC) as a bandwidth decision parameter is presented. The validity of PC utilisation is compared with QOS parameters in buffer-less environments when only the cell loss ratio (CLR) parameter is relevant. The convolution algorithm is a good solution for CAC in ATM networks with small buffers. If the source characteristics are known, the actual CLR can be very well estimated. Furthermore, this estimation is always conservative, allowing the retention of the network performance guarantees.
Several experiments have been carried out and investigated to explain the deviation between the proposed method and the simulation. Time parameters for burst length and different buffer sizes have been considered. Experiments to confine the limits of the burst length with respect to the buffer size conclude that a minimum buffer size is necessary to achieve adequate cell contention. Note that propagation delay is a no dismiss limit for long distance and interactive communications, then small buffer must be used in order to minimise delay.
Under previous premises, the convolution approach is the most accurate method used in bandwidth allocation. This method gives enough accuracy in both homogeneous and heterogeneous networks. But, the convolution approach has a considerable computation cost and a high number of accumulated calculations.
To overcome this drawbacks, a new method of evaluation is analysed: the Enhanced Convolution
Approach (ECA). In ECA, traffic is grouped in classes of identical parameters. By using the multinomial distribution function instead of the formula-based convolution, a partial state corresponding to each class of traffic is obtained. Finally, the global state probabilities are evaluated by multi-convolution of the partial results. This method avoids accumulated calculations and saves storage requirements, specially in complex scenarios.
Sorting is the dominant factor for the formula-based convolution, whereas cost evaluation is the dominant factor for the enhanced convolution. A set of cut-off mechanisms are introduced to reduce the complexity of the ECA evaluation. The ECA also computes the CLR for each j-class of
traffic (CLRj), an expression for the CLRj evaluation is also presented.
We can conclude that by combining the ECA method with cut-off mechanisms, utilisation of ECA in real-time CAC environments as a single level scheme is always possible.

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Gam, Sofiène. « Contributions to simulation based performance study of heteregenous networks ». Paris 6, 2003. http://www.theses.fr/2003PA066530.

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Yan, Zhaohui. « Performance Analysis of A Banyan Based ATM Switching Fabric with Packet Priority ». PDXScholar, 1995. https://pdxscholar.library.pdx.edu/open_access_etds/5199.

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Since the emergence of the Asynchronous Transfer Mode ( A TM ) concept, various switching architectures have been proposed. The multistage interconnection networks have been proposed for the switching architecture under the A TM environment. In this thesis, we propose a new model for the performance analysis of an A TM switching fabric based on single-buffered Banyan network. In this model, we use a three-state, i.e., "empty", "new" and "blocked" Markov chain model to describe the behavior of the buffer within a switching element. In addition to traditional statistical analysis including throughput and delay, we also examine the delay variation. Performance results show that the proposed model is more accurate in describing the switch behavior under uniform traffic environment in comparison with the "two-state" Markov chain model developed by Jenq, et. al.[4] [6] . Based on the "three-state" model, we study a packet priority scheme which gives the blocked packet higher priority to be routed forward during contention. It is found that the standard deviation of the network delay is reduced by about 30%.

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Smith, Quentin D. « AN EVOLUTIONARY APPROACHTO A COMMUNICATIONS INFRASTRUCTURE FOR INTEGRATED VOICE, VIDEO AND HIGH SPEED DATA FROM RANGETO DESKTOP USING ATM ». International Foundation for Telemetering, 1993. http://hdl.handle.net/10150/608864.

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International Telemetering Conference Proceedings / October 25-28, 1993 / Riviera Hotel and Convention Center, Las Vegas, Nevada
As technology progresses we are faced with ever increasing volumes and rates of raw and processed telemetry data along with digitized high resolution video and the less demanding areas of video conferencing, voice communications and general LAN-based data communications. The distribution of all this data has traditionally been accomplished by solutions designed to each particular data type. With the advent of Asynchronous Transfer Modes or ATM, a single technology now exists for providing an integrated solution to distributing these diverse data types. This allows an integrated set of switches, transmission equipment and fiber optics to provide multi-session connection speeds of 622 Megabits per second. ATM allows for the integration of many of the most widely used and emerging low, medium and high speed communications standards. These include SONET, FDDI, Broadband ISDN, Cell Relay, DS-3, Token Ring and Ethernet LANs. However, ATM is also very well suited to handle unique data formats and speeds, as is often the case with telemetry data. Additionally, ATM is the only data communications technology in recent times to be embraced by both the computer and telecommunications industries. Thus, ATM is a single solution for connectivity within a test center, across a test range, or between ranges. ATM can be implemented in an evolutionary manner as the needs develop. This means the rate of capital investment can be gradual and older technologies can be replaced slowly as they become the communications bottlenecks. However, success of this evolution requires some planning now. This paper provides an overview of ATM, its application to test ranges and telemetry distribution. A road map is laid out which can guide the evolutionary changeover from today's technologies to a full ATM communications infrastructure. Special applications such as the support of high performance multimedia workstations are presented.

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Erdahl, Mike. « Planned Evolution of Range Telemetry and Communications into the Public Data Network ». International Foundation for Telemetering, 1994. http://hdl.handle.net/10150/611743.

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International Telemetering Conference Proceedings / October 17-20, 1994 / Town & Country Hotel and Conference Center, San Diego, California
The area of range telemetry and communications has been under budget constraints and interoperability enhancement requirements for some time. The near-term onslaught of multimedia communications offerings by telephony and communications companies is certain to cause range engineering personnel to conduct extensive research and possibly make numerous decisions on procurements and technologies before standards are finalized. This paper will address a low-risk migration path for range telemetry to the new multimedia communications for ranges based on current capabilities. This migration path has an end goal of positioning the ranges to take advantage of future multimedia communications as they become available, while leveraging off of current products and procurements, without a major investment.

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Harris, Carol, Michele Mascari, Kevin Rice, Jeff Smith et John Steedman. « ASYNCHRONOUS TRANSFER MODE (ATM) CONVERSION DEVICE (ACD) ». International Foundation for Telemetering, 1997. http://hdl.handle.net/10150/607525.

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International Telemetering Conference Proceedings / October 27-30, 1997 / Riviera Hotel and Convention Center, Las Vegas, Nevada
The Asynchronous Transfer Mode (ATM) Conversion Device (ACD) System is based on state-of-the-art ATM technology. The system interfaces between high-rate ECL/RS-422 raw data bitstreams and Synchronous Optical Network (SONET) OC-3 fiber. The SONET OC-3 interface uses ATM Adaptation Layer Type Five (AAL5) format. The system exceeds its 50 Mbps raw data, single stream requirement and provides single stream raw data throughput at rates up to 75 Mbps. With ATM and SONET packaging overhead, this translates into 90 Mbps on the OC-3 fiber. In addition to high-rate throughput, the system provides multiplexing and demultiplexing of multiple stream throughput based on the ATM cell header Virtual Path and Virtual Channel Identifier (VPI/VCI) values. The system is designed with the flexibility to provide between three and six throughput channels. All of which are multiplexed/demultiplexed to and from the same OC-3 interface. Multiple stream cumulative raw data throughput rates of up to 80 Mbps, or 96 Mbps on the fiber, have successfully run.

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Shankaran, Rajan, University of Western Sydney et School of Computing and Information Technology. « Asynchronous transfer mode security ». THESIS_XXX_CIT_Shankaran_R.xml, 1999. http://handle.uws.edu.au:8081/1959.7/252.

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There is a growing interest in the development of broadband services and networks for commercial use in both local area and wide area networks. The primary reasons for this is a pressing need to meet the demand for increased bandwidth for remote sites interconnection, and in high speed data transfer of bulk data such as images etc. There has also been a significant change in the characteristics of network traffic. It is increasingly taking the form of bursty traffic characterized by an unpredictable demand for bandwidth of several megabytes. A new generation of networking technologies have emerged to meet the demand of growing and uncertain bandwidth requirements. One such technology is called Asynchronous Transfer Mode (ATM) for use on broadband networks under the banner of broadband ISDN. ATM enables interconnection at high speeds in the range of Mbit/s or Gbit/s over wide areas, which effectively moves the bottleneck from networks to end systems. Furthermore, the user is able to access bandwidth on demand and the user is only charged for the bandwidth actually used. As more and more information (audio, image and data) is transferred over ATM networks, security issues are becoming increasingly critical. The rapidly growing use of the Internet to transfer confidential and sensitive information only enhances the importance of security services. One may even argue that the success of ATM will be determined not by its cost effectiveness but also to the level of trust that can be placed on its performance, security and availability. The objective of this dissertation is to address the issues involved in the design of security services for ATM networks.
Master of Science (Hons)

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Eslinger, Brian, et Joleen McCombe. « Range Communications System Using Asynchronous Transfer Mode (ATM) ». International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/609653.

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International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California
As aircraft become more complex and require more resources over larger areas, the challenge of the test ranges is to provide economical solutions to move telemetry data from the test article to the data processing facility. Edwards AFB is in the process of upgrading the ground transmission facilities to transport data including telemetry using Asynchronous Transfer Mode (ATM). This paper documents the challenge of supporting telemetry over ATM, different approaches that are available, the benefits of using ATM, and discussion of candidate hardware options. The effort at Edwards include the linking of the major range facilities over a fiber optic backbone and links to other major test ranges in the Southwest Range Complex via microwave. The fiber optic backbone is expected to be OC-12c (622 Mbps) ATM supporting new capabilities as well as all of the legacy systems. The backbone system will be designed so that migration to OC-48 is possible without service disruption. The microwave links are multiple DS-3 capable. Some of these DS-3s may support legacy systems, but the ability to link ranges using ATM is expected simultaneously.

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Cheng, Heng Seng. « Enhancement of asynchronous transfer mode over satellite links ». Thesis, University of Aberdeen, 1998. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU106658.

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This thesis is a study on the issues involved in implementing asynchronous transfer mode (ATM) over satellite links and the ways in which ATM can be optimised to achieve better performance over such links. The main issue is the impact of errors introduced by the satellite links on the performance of ATM. Options to improve the performance of ATM over SATCOM have been identified and they are: (i) increase transmit power, (ii) FEC, (iii) adoption of an alternative ATM architecture, (iv) extensive to commercial-off-the-shelf (COTS) ATM equipments and (v) construction of ATM protocol enhancers. The fifth option which uses a combination of protocol conversions and error control techniques is preferred over the others as it allows maximum use of standard COTS ATM equipments and provides a framework for experimentation with multiple versions of ATM equipments (that are evolving rapidly). As part of the strategy of using protocol enhancement to improve the performance of ATM, two techniques have been proposed. The first technique is called cell header duplication, and it improves cell loss ratio by compressing the information in the cell headers and using the extra room in each header to carry the duplicate compressed header information of the previous cell. When a cell header is corrupted, the corrupted header information is replaced with the duplicate copy carried in the next cell, provided that too is not corrupted. This technique was compared with cell header interleaving and error tolerant addressing which are cell header protection techniques proposed by others. The second technique is called selective cell retransmission, which employs a partial retransmission (hybrid) ARO strategy to perform error recovery for only the individually errored non-realtime cells allowing it to achieve higher reliability of data transfer and more efficient utilisation of satellite bandwidth. The overhead in the proposed scheme varies according to the error conditions in the satellite channel making it an adaptive system. This is achieved by using a unique method of sending error erasure information (inserted into cells carrying negative acknowledgement messages) from the receiver to the transmitter which will use this information to pin-point the corrupted cells. The scheme is also compared with concatenated coding (using a Reed-Solomon code) and link protocols (using selective repeat (full retransmission) ARQ).

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