No description available.

No description available.

Thesis (Ph. D.)--Carleton University, 1988. / Also available in electronic format on the Internet.

Thesis (M. S.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2008. / Ferri, Bonnie Heck, Committee Member ; Gavrilovska, Ada, Committee Member ; Yalamanchili, Sudhakar, Committee Member ; Schwan, Karsten, Committee Chair.

- / -

This dissertation is concerned with the design of a high speed fiber optic campus backbone network which not only provides a high bandwidth connection to various LANs, PBXs, ISDNs, supercomputers, and other high speed computing facilities but also offers an integrated service of voice and data. The campus backbone network is based on an optical fiber dual ring structure. A new token ring protocol based on the IEEE 802.5 standard is proposed as the medium access protocol for the backbone network. In the proposed token ring network, the token holder transmits packets in an exhaustive way when no other nodes want to transmit voice packets. If any node has voice packets waiting for transmission, the token holder can transmit only a single packet during its access opportunity. In this way, not only can the voice delay be bounded at high voice traffic intensities, but a high data throughput can be achieved at low voice traffic intensities. The potential use of Time Division Multiplexing (TDM) was also considered, but the TDM technique was found to be less suitable for our campus environment mainly due to its low efficiency in bursty environments and complex hardware requirements. The backbone network was simulated using the Simscript II.5 discrete event simulation language. The simulation results indicated that the proposed token ring protocol provides satisfactory performances in every respect. A network interface unit (NIU) was designed, which consists of optical transmitter, receiver, and fault tolerance mechanisms as well as the protocol engine. The optimal values of major parameters for the NIU design were determined by the simulation.

The focus of this dissertation is the development of resource management schemes for integrated networks, with the major contributions being: (i) the development of an optimal adaptive buffer management scheme for the packet-switched subsystem, (ii) the integration of a moveable-boundary hybrid switching scheme with the time assigned speech interpolation technique for implementing a congestion control mechanism for the packet-switched subsystem, and (iii) the development of an adaptive hierarchical scheme for implementing the access control and routing functions within the circuit-switched subsystem. The problem of buffer management at an integrated network node is formulated as a nonlinear programming problem with a convex objective function and an interative solution technique with fast convergence is proposed for a real-time implementation of the buffer management scheme in practical environments. In order to exercise an additional degree of control over the packet-blocking probability at each hybrid-switched link within the network, a new multiplexing scheme based on the integration of the moveable-boundary hybrid switching scheme and the time assigned speech interpolation technique is presented in this dissertation. The tradeoff between the corresponding decrease in the packet blocking probability and the increase in the circuit freezeout fraction is demonstrated by a detailed queueing analysis of the multiplexer. Specific algorithms are also presented in this dissertation for the solution of the access control and routing problems within the circuit-switched subsystem. In particular, an access control scheme is developed by solving an integer programming problem formulated using the policy of complete partitioning of the available bandwidth among the competing user classes. As an alternative to the completely partitioned approach, the problem of traffic routing is considered in a network that supports homogeneous traffic classes based on the policy of complete sharing. Finally, for the general case of networks with heterogeneous traffic classes, a hierarchical scheme is developed for the implementation of the access control and the routing functions at two functional levels, where the access control is implemented by the network supervisor who solves an appropriate linear integer programming problem periodically, and the routing function is handled by the individual nodes of the network on a distributed basis. (Abstract shortened with permission of author.)

by Cheung Kam Wah. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1993. / Includes bibliographical references (leaves 62-63). / Chapter Chapter 1. --- Introduction --- p.1 / Chapter Chapter 2. --- ISDN Architecture --- p.4 / Chapter 2.1 --- ISDN Definition --- p.4 / Chapter 2.2 --- Channel Structure --- p.6 / Chapter 2.3 --- Wiring Configuration of ISDN User-Network Interface --- p.6 / Chapter 2.4 --- ISDN Signalling Protocol at S/T Interface --- p.7 / Chapter Chapter 3. --- ISDN Signalling Protocol Enhancement --- p.8 / Chapter 3.1 --- ISDN Basic Rate Access Configuration --- p.8 / Chapter 3.2 --- Protocol Enhancement --- p.10 / Chapter 3.3 --- ISDN Layer 1 Signalling Protocol Enhancement --- p.11 / Chapter 3.4 --- ISDN Layer 2 Signalling Protocol Enhancement --- p.13 / Chapter 3.5 --- ISDN Layer 3 Signalling Protocol Enhancement --- p.15 / Chapter Chapter 4. --- Basic Call Control Procedure for Special Terminal Equipment --- p.18 / Chapter 4.1 --- Signalling Procedure for Call establishment and Termination --- p.18 / Chapter 4.2 --- Requirements on the Developed System --- p.27 / Chapter Chapter 5. --- Software Simulation --- p.29 / Chapter Chapter 6. --- System Performance Analysis --- p.33 / Chapter 6.1 --- Simple Measurement on the Execution Time of ISDN Call --- p.33 / Chapter 6.2 --- Call Handling Capacity Analysis --- p.36 / Chapter 6.3 --- Call Request Delay Analysis --- p.42 / Chapter Chapter 7. --- Conclusion --- p.59 / References --- p.62 / Appendix I: Software Simulation Program Flowchart --- p.64 / Appendix II: Software Simulation Program in Borland C++ Language --- p.86

by Chan-weng Lai. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1995. / Includes bibliographical references (leaves 81-[83]). / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Where May Soft Multiplexing Occur? --- p.2 / Chapter 1.1.1 --- Multiplexing VC's on to a VP --- p.2 / Chapter 1.1.2 --- Virtual Private Networks --- p.5 / Chapter 1.2 --- Survey of Previously Proposed Hard Multiplexing Schemes --- p.7 / Chapter 1.3 --- Contributions of This Thesis --- p.8 / Chapter 1.4 --- Organization of This Thesis --- p.10 / Chapter 2 --- "Effect of (δ,p) Channels in ATM Networks" --- p.12 / Chapter 2.1 --- Leaky Bucket --- p.13 / Chapter 2.2 --- "(δ, p) Channel" --- p.14 / Chapter 2.3 --- "Comparison of Deterministic VP's and(δ, p) VP's" --- p.17 / Chapter 2.4 --- A Simulation Study : The Effect of δ --- p.20 / Chapter 2.5 --- Summary of This Chapter --- p.23 / Chapter 3 --- Soft-Multiplexing Scheduling Schemes --- p.26 / Chapter 3.1 --- Issues in Soft Multiplexing --- p.27 / Chapter 3.2 --- First Come First Serve (FCFS) --- p.30 / Chapter 3.3 --- Fixed-resource Allocation --- p.32 / Chapter 3.4 --- Excess Token Passing --- p.35 / Chapter 3.5 --- Simulation Results --- p.38 / Chapter 3.6 --- Summary of This Chapter --- p.42 / Chapter 4 --- Analysis of Rate Proportional Token Passing --- p.44 / Chapter 4.1 --- The Fictitious System --- p.45 / Chapter 4.2 --- Leaky-Bucket-Controlled Sources --- p.49 / Chapter 4.3 --- Delay Bound for All Work Conserving Soft Multiplexers --- p.51 / Chapter 4.4 --- The All-Greedy Bound in a RPTP Multiplexer --- p.53 / Chapter 4.5 --- Calculation of the Worst-Case Delay in a RPTP Multiplexer --- p.56 / Chapter 4.6 --- Summary of This Chapter --- p.61 / Chapter 5 --- Implementation of RPTP --- p.63 / Chapter 5.1 --- Virtual Time Implementation --- p.64 / Chapter 5.2 --- Leaky Bucket Implementation --- p.70 / Chapter 5.3 --- Summary of This Chapter --- p.72 / Chapter 6 --- Conclusion --- p.73 / Chapter A --- End-to-end Delay/Backlog Bound in ATM Networks --- p.76 / Bibliography --- p.81

The development of digital networks has allowed the largest news media organisations to consolidate and centralise their publishing businesses in flourishing capital-city markets. This has resulted in a withdrawal from other less-viable markets, especially those which are geographically remote, and the subsequent emergence of the 'digital divide' with its attendant negative effects. This thesis proposes that the combination of technologies, theories and processes which has brought about the 'digital divide' can now be realigned to reverse those negative effects, and to enhance the possibility of focussed participatory communication taking place within and between those previously less-viable markets. This enhanced participatory communication - which I have named 'integrated journalism' - brings with it measurable and positive effects, generally known as community capacity building effects, which lead to better outcomes for the members of enhanced communities, a more innovative and flourishing approach to life and business, and a more innovative and forward-looking atmosphere within enhanced communities. Two new models are devised and presented: the first allows members of audience communities to learn and implement the process of publishing a community newspaper under the tuition of an experienced journalist; the second enables both journalists and audience members to measure and direct the effects of news publication within communities.