DQDBsim User\u27s Manual

DQDBsim is a simulation program for the study of the performance of the Distributed Queue Dual Bus (DQDB) Metropolitan Area Network. The simulation is based on the description of DQDB found in [Ins90]. Only the Queued Arbitrated (QA) service is modeled by DQDBsim the inclusion of Prearbitrated (PA) service is under consideration for inclusion in a future release. This document contains a description of the program instructions for its use details of the formats of input and data files and information on other programs that are used cooperatively with DQDBsim

Modeling and performance analysis of ATM LANs

Asynchronous Transfer Mode (ATM} is a method of data transmission using small fixed-length cells. This thesis presents a model of an ATM LAN which provides a realistic representation of data transmission over the system by explicitly modeling both the ATM network and the applications running over that network. Coloured timed Petri nets are used to create a compact model that is capable of representing a variety of different protocols at a high level of detail. The model is designed to allow easy reconfiguration or addition of detail at different levels of the system. Simulation is used to evaluate the performance of the model, and results are compared to actual data gathered from the Memorial University campus network

Technology Directions for the 21st Century

New technologies will unleash the huge capacity of fiber-optic cable to meet growing demands for bandwidth. Companies will continue to replace private networks with public network bandwidth-on-demand. Although asynchronous transfer mode (ATM) is the transmission technology favored by many, its penetration will be slower than anticipated. Hybrid networks - e.g., a mix of ATM, frame relay, and fast Ethernet - may predominate, both as interim and long-term solutions, based on factors such as availability, interoperability, and cost. Telecommunications equipment and services prices will decrease further due to increased supply and more competition. Explosive Internet growth will continue, requiring additional backbone transmission capacity and enhanced protocols, but it is not clear who will fund the upgrade. Within ten years, space-based constellations of satellites in Low Earth orbit (LEO) will serve mobile users employing small, low-power terminals. 'Little LEO's' will provide packet transmission services and geo-position determination. 'Big LEO's' will function as global cellular telephone networks, with some planning to offer video and interactive multimedia services. Geosynchronous satellites also are proposed for mobile voice grade links and high-bandwidth services. NASA may benefit from resulting cost reductions in components, space hardware, launch services, and telecommunications services

Presentation of an Estimator for the Hurst Parameter for a Self-Similar Process Representing the Traffic in IEEE 802.3 Networks

The hypothesis for the existence of a process with long term memory structure, that represents the independence between the degree of randomness of the traffic generated by the sources and the pattern of traffic stream exhibited by the network is presented, discussed and developed. This methodology is offered as a new and alternative way of approaching the estimation of performance and the design of computer networks ruled by the standard IEEE 802.3-2005

Timed petri net models of ATM LANs

The Asynchronous Transfer Mode (ATM) is a fast packet-switching communication method using small fixed-length cells. A model of an ATM LAN is presented which provides a realistic representation of data transmission by modeling both the ATM network and the applications running over it. Colored Petri nets are used to create a compact model that is capable of representing a variety of different protocols at a high level of detail. The model is designed to allow easy reconfiguration or addition of details at different levels of the system. Simulation is used to evaluate the performance of the modeled system, and some results are compared to actual data gathered from the campus network at Memorial University

Paying for high speed networking services

The idea of a free network is a myth of the past. Networking costs are expected to remain a burden to future IT budgets, no doubt raising questions regarding the payment of such services. Users do not normally pay to use local area networks, as companies tend to own their LANs. However, when wide area or international networks are considered, the situation is different. It is argued that in these cases the invoicing and payment system should be integral to the network's communication protocol. This implies changes to the networking protocol (to handle invoicing) as well as a new look at customary ideas of representing currency (to handle payment). In this dissertation, an invoicing and payment scheme that uses electronic cash and is implemented as part of the basic ATM protocols is discussed. The main advantages of this scheme can be summarized as a low administrative overhead and user privacy.Computer ScienceM. Sc. (Computer Science

Implementation of a high-speed optical network and spectrum analysis of a multichannel CATV system.

by Chun-kit Chan.Thesis (M.Phil.)--Chinese University of Hong Kong, 1995.Includes bibliographical references (leaves 68-[73]).Chapter 1 --- A High-Speed All-Optical Tunable-Channel Multi-Access (TCMA) Network --- p.1Chapter 1.1 --- Introduction --- p.1Chapter 1.2 --- Tunable-Channel Multi-Access (TCMA) Networks --- p.4Chapter 1.3 --- Protocols For TCMA Networks --- p.5Chapter 1.3.1 --- Media Access Procedure For ACTA Protocol --- p.6Chapter 1.3.2 --- Cyclc Utilization & Adaptive Algorithm --- p.8Chapter 1.3.3 --- Advantages of ACTA Protocol --- p.9Chapter 1.4 --- Proposed High-Speed Photonic TDM Implementation --- p.10Chapter 1.4.1 --- Centralized Pulse Source --- p.12Chapter 1.4.2 --- Channel-Tunable Transmitter --- p.14Chapter 1.4.3 --- High Speed All-Optical Demultiplexing --- p.22Chapter 1.4.4 --- Timing and Synchronization --- p.23Chapter 1.4.5 --- Advantages of the Proposed Scheme --- p.24Chapter 1.5 --- Other Network Issues --- p.25Chapter 1.5.1 --- Scalability --- p.25Chapter 1.5.2 --- Surviability --- p.26Chapter 1.5.3 --- Cost-Effectiveness --- p.27Chapter 1.6 --- Conclusion --- p.28Chapter 2 --- Theoretical Analysis of High Repetition Rate Optical Pulse Multiplication using Fiber Coupler Loop Configuration --- p.29Chapter 2.1 --- Introduction --- p.29Chapter 2.2 --- Single Coupler Loop Configuration --- p.30Chapter 2.3 --- Cascaded Coupler Loop Configuration --- p.34Chapter 2.4 --- Discussion --- p.36Chapter 2.5 --- Conclusion --- p.38Chapter 3 --- Spectrum Analysis of Multichannel CATV Systems --- p.39Chapter 3.1 --- Introduction --- p.39Chapter 3.2 --- Considerations of Analysis of Multichannel CATV Systems --- p.41Chapter 3.3 --- Effects of Incomplete-cycle Sampling --- p.43Chapter 3.4 --- Methods to Alleviate the Incomplete-cycle Sampling Effcct --- p.48Chapter 3.4.1 --- Windowing --- p.48Chapter 3.4.2 --- Correction --- p.54Chapter 3.5 --- Nonlinear Distortion in Multichannel CATV Systems --- p.55Chapter 3.5.1 --- Two-tone Third Order Distortion Estimation --- p.56Chapter 3.5.2 --- Composite Triple Beat Estimation --- p.62Chapter 3.6 --- A Procedure of Spectrum Analysis for Multichannel CATV Systems --- p.64Chapter 3.7 --- Conclusion --- p.67Bibliography --- p.68Chapter A --- Implementation of a high-speed TCMA optical network --- p.74Chapter A.1 --- System Setup --- p.74Chapter A.2 --- Channel-tunable Delay Line Circuit --- p.75Chapter A.3 --- DFB Laser diode --- p.76Chapter A.4 --- Erbium-doped Fiber Amplifier (EDFA) --- p.76Chapter A.5 --- 1 Gb/s to 16 Gb/s Fiber Multiplexer --- p.77Chapter A.6 --- Nonlinear Amplifying Loop Mirror (NALM) --- p.77Chapter A.7 --- Decision Circuit --- p.78Chapter B --- Frequency Assignment Scheme of CATV Systems --- p.79Chapter C --- Derivation --- p.80Chapter C.1 --- Channel Carrier Power Level Variation with Rectangular Window --- p.81Chapter C.2 --- Channel Carrier Power Level With Hanning Window Function ´Ø --- p.82Chapter C.3 --- Correction Factor for the Channel Carriers --- p.83Chapter C.4 --- Correction Scheme for Distortion Terms --- p.8

Satellite Networks: Architectures, Applications, and Technologies

Since global satellite networks are moving to the forefront in enhancing the national and global information infrastructures due to communication satellites' unique networking characteristics, a workshop was organized to assess the progress made to date and chart the future. This workshop provided the forum to assess the current state-of-the-art, identify key issues, and highlight the emerging trends in the next-generation architectures, data protocol development, communication interoperability, and applications. Presentations on overview, state-of-the-art in research, development, deployment and applications and future trends on satellite networks are assembled

Quality of service over ATM networks

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