This thesis presents the development and implementation of two fundamental communication sublayers, medium access and logical link, for a new Local Area Network (LAN) which utilizes the intra-building power distribution circuit as physical transmission medium. This medium provides a low cost means for data communications with a high degree of portability. A low-to-medium data rate and a relatively high error rate are two of the major disadvantages associated with the use of the medium. The Logical Link Control (LLC) protocol adopted is a modified version of the IEEE 802.2 protocol; whereas, the Medium Access Control (MAC) protocol used is a simple hub polling scheme. For efficiency reason, both LLC and MAC sublayers are implemented in the kernel of the UNIX¹ operating system. The schemes used, justifications for the decisions made and their implementations are discussed in details in the thesis. The performance of the power line LAN formed with four Sun workstations² using modems with a data rate of 14.4 kilo-bit per second is measured and analyzed. ¹UNIX is a trademark of AT & T Bell laboratories. ²Sun workstation is a trademark of Sun Microsystems. / Science, Faculty of / Computer Science, Department of / Graduate

A high-speed local area communication network--the Expressnet--is investigated in this thesis with regard to voice and data transmissions. Performance criteria, such as channel utilizations, delay characteristics, and queue lengths are determined from computer simulation and numerical calculation approaches. The protocol is particularly suitable for the transmission of packetized voice as it is able to guarantee an upper bound on the transmission delay for each packet. The network under study thus will find major application in future office automation, where large amounts of voice will be integrated with data. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

by Chan Kwok-sum, Mak Wai-sing. / Bibliography: leaves 85-86 / Thesis (M.B.A.)--Chinese University of Hong Kong, 1986

Xie, Zhenchang. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2010. / Includes bibliographical references (p. 48-50). / Abstracts in English and Chinese. / Abstract --- p.ii / Table of Contents --- p.v / List of Figures --- p.vi / List of Tables --- p.vii / Chapter Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Development of fiber optic networks --- p.1 / Chapter 1.2 --- Optical transmission system --- p.2 / Chapter 1.3 --- The motivation of this thesis --- p.7 / Chapter 1.4 --- Outline of this thesis --- p.8 / Chapter Chapter 2 --- The Consolidation of Two Coexisting Networks with Full-Interconnection --- p.10 / Chapter 2.1 --- Assumptions and problem formulation --- p.10 / Chapter 2.2 --- Definitions and notations --- p.12 / Chapter 2.3 --- An algorithm to derive Lmin --- p.13 / Chapter 2.4 --- Example illustrations --- p.17 / Chapter 2.5 --- "The number of fiber links required over the number of nodes of a network, L/N" --- p.21 / Chapter 2.6 --- Summary --- p.22 / Chapter Chapter 3 --- The Consolidation of Two Coexisting Networks with Two Interconnection Links --- p.23 / Chapter 3.1 --- Assumptions --- p.24 / Chapter 3.2 --- Analysis on the optimal location of the two interconnection links --- p.25 / Chapter 3.3 --- Notations --- p.25 / Chapter 3.4 --- Theorems and corollaries --- p.25 / Chapter 3.5 --- "The number of fiber links required over the number of nodes of a network, L/N" --- p.35 / Chapter 3.6 --- Summary --- p.36 / Chapter Chapter 4 --- Protection of the Consolidated Network --- p.37 / Chapter 4.1 --- Full-interconnection case --- p.38 / Chapter 4.2 --- Two interconnection case --- p.39 / Chapter 4.3 --- Summary --- p.44 / Chapter Chapter 5 --- Summary and Future Works --- p.45 / Chapter 5.1 --- Summary --- p.45 / Chapter 5.2 --- Future works --- p.47 / Bibliography --- p.48 / Appendix ´ؤ List of publications --- p.52

This thesis work researches the theory and application of systems performing omnidirectional, non-direct path optical data communication (ONP systems). Such systems are characterized by 1) the communication involves a local, usually circular area; 2) Obstacles are allowed between a transmitter and the receivers. This is in contrast to the point-to-point and line-of-sight communications performed by almost all existing infrared data communication or transmission systems. The elimination of the point-to-point limitation makes ONP systems suitable for optical local area networking. The feasibility of ONP systems employing infrared LEDs and silicon photo detectors has been analyzed and the performance of such systems predicted. The analysis shows that indoor ONP systems are both feasible and practical. Only a few LEDs are required to cover the entire area of a large room. Efforts have been made in finding rules for optimal design of the ONP systems. A set of design criteria and curves have been established. The theoretical analysis has been verified in a successful experiment done with OptoNet, an ONP infrared datalink for local area networks. This experimental system consists of two identical communication units employing FSK modulation and microprocessor controllers. The experiment has demonstrated that the ONP optical data communications can be realized by relatively simple electronic hardware. / Graduation date: 1991

Thesis (M.S. in Information Systems)--Naval Postgraduate School, September 1990. / Thesis Advisor(s): Tung Xuan Bui. Second Reader: Smith, Henry H. "September 1990." Description based on title screen as viewed on December 16, 2009. DTIC Identifier(s): Local area networks, security, control systems, thesis. Author(s) subject terms: Computer security, local area network (LAN), security and control. Includes bibliographical references (p. 87-90). Also available in print.

Project report (M. Eng.)--Virginia Polytechnic Institute and State University, 1990. / Vita. Abstract. Includes bibliographical references (leaf 97). Also available via the Internet.

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1991. / Vita. Abstract. Includes bibliographical references (leaves 87-88). Also available via the Internet.

Thesis (M.S. in Computer Science)--Naval Postgraduate School, March 2005. / Thesis Advisor(s): Thuy D. Nguyen, Cynthia E. Irvine. Includes bibliographical references (p. 53). Also available online.

Thesis (M.S.C.I.T.)--Regis University, Denver, Colo., 2005. / Title from PDF title page (viewed on Dec. 28, 2005). Includes bibliographical references.