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The description of a Network Management Package (NMP) for Packet Communications Units (PCUs) in a Local Area Network (LAN) is presented. The LAN consists of a Sytek LocalNet 20, a Sytek System 2000, a Sytek System 6000, and a Concord Data Systems Token/Net. The NMP accesses and controls the local and remote PCUs on the networks. The communication interface software module is responsible for opening and closing the session between the PC and PCU ports. The NMP supports a set of operations used by a network manager to control and manage the network PCUs. The user uses the NMP to integrate each PCU and check and set its attributes. The NMP was developed to run in the Computer Engineering Research Laboratory and in the University of Arizona broadband cable plant. The NMP allows different PCUs (local or remote) to check and modify PCU's attributes while users work on their own PCUs. (Abstract shortened with permission of author.)

Resources are said to be fragmented in the network when they are available in non-contiguous blocks, and calls are dropped as they may not end sufficient resources. Hence, available resources may remain unutilized. In this thesis, the effect of resource fragmentation (RF) on RSVP-controlled networks was studied and new algorithms were proposed to reduce the effect of RF. In order to minimize the effect of RF, resources in the network are dynamically redistributed on different paths to make them available in contiguous blocks. Extra protocol messages are introduced to facilitate resource redistribution in the network. The Dynamic Resource Redistribution (DRR) algorithm when used in conjunction with RSVP, not only increased the number of calls accommodated into the network but also increased the overall resource utilization of the network. Issues such as how many resources need to be redistributed and of which call(s), and how these choices affect the redistribution process were investigated. Further, various simulation experiments were conducted to study the performance of the DRR algorithm on different network topologies with varying traffic characteristics.

M.Com. (Informatics) / This dissertation examines the field of network management in a banking environment. Special attention is given to business aspects that might influence network management. Technical aspects of network management are only discussed briefly. The study is broadly divided into two sections, the theoretical background and the formulation of a network model in the banking environment. Banks require that their services must always be of the highest standard. Special attention is given to services that banks provide on a daily basis. Network management can become very technical and complex. Large networks can become a nightmare to manage without proper business management principles. The dissertation offers an introduction to business principles and concentrates on different environments that might influence banks and their networks. The study indicates the importance of the open system environment for banks. The success of open systems largely depends on the acceptance of standards set by standard organizations like ISO (International Standards Organization). Banks in general are mainly dependent on IBM products and they rely on IBM to provide for their open needs. The dissertation covers the problems that IBM faces in opening up their systems. Network management protocols are very important. Today there are two main contenders in this area, namely SNMP and CMIP. In the future both protocols might play a role in managing networks. Identification of banks' needs and requirements is important for the definition of the model. Special consideration is given to external factors influencing banks and their networks. To isolate these influences three environments can be identified namely the macro, market and micro environments. The most important requirement of banks is to provide a reliable and continuous service of high standing quality to their clients. Banks provide a variety of financial services to their customers and the competition between different banks makes the development of new, and the improvement of existing services ...

這篇論文討論了三個重要的全光網絡的網絡管理方向，分別為在全光封包交換網絡的光路追踪問題，光封包的暫存及在波分複用無源光網絡（WDM-PON）的能源節省運作。 / 使用全光編碼器進行光路追踪 / 在所有全光封包交換網絡中，數據包的路由光路是可以被通過光學交叉連接（OXC）的網絡節點重新配置。要監控任何可能的路由錯誤、信號質量下降的任何可能的原因、發現任何惡意或攻擊流量的來源、或提供服務質量（QoS）的路由策略，光學數據包的光路監測是必要的。此方案編碼光路信息到光學數據的標籤，每個網絡節點被分配一個獨特的質數為識別標記的光路信息。使用位於OXC輸出端的光學編碼器，每次當數據包通過該網絡節點時，數據包的標籤值將乘以特定的質數。網絡數據包已經走過的節點將被編碼的標籤為代表的網絡節點的所有素數的乘積。因此，在標籤的檢示器中，光數據包走過的每個網絡節點都可以很容易地通過標籤值的因式分解求得。 / 相比使用時間延遲識別技術，我們的設計大幅減少了光纖線的長度要求。此外，與導頻訊號檢測方法相比，它提供了快速檢測的好處。此外，網絡循環的問題也可以檢測。編碼標籤也可以作為的光封包的保存週期指示器（TTL）。 / 功率控制的全光封包緩衝器 / 全光封包緩衝區全光交換網絡中是非常重要的。為了實現簡單而有效的光學數據包緩衝操作，我們提出使用功率控制時間延遲的全光數據包緩衝區。的循環迴路的數量是由輸入信號的功率控制（即具有較高的功率輸入信號將經歷更長的時間延遲）。我們把偱環延遲緩衝器重新設計成信號功率依賴過濾的問題。光信號首先通過在不同的時刻，每延遲副本將減半功率與前一個通過循環生成多個副本的循環。然後，它會通過信號的功率大子而使用非線性光學效應來實施過濾。過濾器只與特定功率水平的信號，可以輸出，而別人得到減毒，因此清除的特點。因此，為了改變延遲量，我們只需要改變輸入信號功率等具體延遲的信號，將陷入電源依賴的濾波器的通帶和輸出。 / 比起使用許多的SOA來控制循環延遲或使用可調諧波長轉換器及波長依賴時滯的方案，我們的計劃提供更容易的延遲控制。 / 信號電源效率的WDM-PON的操作技巧 / 在WDM-PON中，光網絡單元（ONU）的上傳信號通過對由光線路終端（OLT）的下傳信號的重新編寫產生。傳統上，這設計產生功耗的問題。例如：如果沒有下傳信號，光網絡單元不能發送上傳數據。因此，即使沒有數據傳送，光線路終端也要不斷傳送下傳信號，為了確保光網絡單元總是能夠發送上傳數據。在這種網絡中，突發傳送模式可以提供電源效率上的節省。我們提出了一個信號傳送技術來由光網絡單元向光線路終端發送“喚醒消息，以通知光線路終端的收發器從睡眠模式恢復。這技術是通過對在RSOA放大自發輻射（ASE）噪聲進行特定導頻信號的，因而不需要重新調制下游信號。在光線路終端，額外的模塊將負責檢測不同光網絡單元的導頻信號，然後啟動相應的收發器。我們的計劃提供了在WDM-PON的簡單和高成本效益的能源節省方案。 / This thesis addresses three important network management aspects of optical networks, namely, optical lightpath tracing problem for all-optical networks, all-optical packet buffering in optical packet switching networks, power-efficient operation in wavelength division multiplexing passive optical networks (WDM-PON). / Lightpath tracing through all-optical encoder / In an all-optical reconfigurable wavelength routing network, the lightpath of the optical data packets can be reconfigured, via the optical cross connects (OXC) residing at each network node. In order to monitor any possible routing errors, any possible causes of signal quality degradation, detect any source of malicious or attack traffic and provide quality of service (QoS) aware next-hop routing strategy, monitoring of lightpath of optical data packets is necessary. This scheme encodes the lightpath information into the label of individual optical packet. Each network node is assigned with a distinct prime number as an identification tag. By using the optical encoders located at the outputs of OXCs, the label value of the packets will be multiplied by the prime number designated to the respective OXC, residing at the network node. Hence, the information of the network nodes that the packet has traversed will be encoded to the label as the product of all the prime numbers assigned to all traversed network nodes. Therefore, at the destination node, the whole physical lightpath of each received optical data packet can be easily identified through factorization of the encoded label value. / Our scheme provides substantial reduction in the requirement of fiber delay lines, as compared to the time-delay recognition techniques. It offers fast detection when comparing with pilot tone detection method. Besides, possible network looping problem can be detected and the encoded label can be acted as time-to-live (TTL) identifier of the optical packet. / All-optical power-controlled optical packet buffer / All-optical packet buffer is essential for the contention resolution in all-optical packet switching network. In order to realize simple and efficient operation of optical packet buffer, we propose the use of all-optical power-controlled packet buffer for which the number of circulating loops is controlled by the input signal power (i.e. input signal with higher power will experience longer delay). We formulate the problem of designing a re-circulating delay buffer into signal power dependent filtering problem. The optical OOK signal first passes through a re-circulating loop generating multiple copies at different time instants that each delayed copy will have halved power as the previous one. Then it will pass through the signal power dependent filter implemented by using optical nonlinear effect. The filter has the characteristics that only signal (packet copy) with specific power level can be outputted while the others get attenuated and therefore cleared. As a result, in order to change the amount of delay, we just need to change the input signal power such that the signal with specific delay will fall into the pass band of the power dependent filter and get outputted. / Compared with other delay schemes which use many SOAs as gates to control the number of re-circulating delay or implementing tunable wavelength converter and passes through wavelength dependent delay, our scheme provides easy control of the delay required. / Signaling techniques for power-efficient operation of WDM-PON / In WDM-PON, the upstream signal at the optical network unit (ONU) can be generated by re-modulating the downstream signal received from the optical line terminal (OLT). However, the conventional architecture may suffer from power consumption problem. When there is no downstream signal, the ONU is not able to send any upstream data. Thus even if there is no traffic on the line, the OLT has to send the downstream signal continuously, in order to ensure the ONU can always be able to send its upstream data. In such networks, burst-mode traffic transmission can provide improvement on power efficiency. We propose a signaling technique to send “Wake Up message from the ONU to OLT, to notify the transceiver of the OLT to recover from sleep mode. It is done by modulating the Amplified Spontaneous Emission (ASE) noise in RSOA at the ONU with the particular ONU specific pilot tone monitoring signal. Thus, it does not require the presence of the remodulating downstream signal. At the OLT, a specific module is needed for the detection of the pilot tones from different ONUs and then activate the corresponding transceiver. Our scheme offers simple and cost-effective approach for power-efficient operation in the WDM-PON. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Tse, Kam Hon. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2012. / Includes bibliographical references (leaves 90-97). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese. / Abstract --- p.i / Acknowledgements --- p.viii / Chapter Chapter 1 --- Background --- p.1 / Chapter 1.1 --- All-Optical Packet Switching Networks --- p.3 / Chapter 1.1.1 --- Packet Buffering --- p.4 / Chapter 1.1.2 --- Route Tracing --- p.7 / Chapter 1.2 --- Wavelength Division Multiplexing Passive Optical Networks (WDM-PON) --- p.12 / Chapter 1.2.1 --- ONU Upstream Re-Modulation in WDM-PON --- p.12 / Chapter 1.2.2 --- Green Networking --- p.13 / Chapter 1.3 --- Contributions --- p.17 / Chapter 1.3.1 --- Path Tracing Scheme for All-Optical Packet-Switched Networks --- p.17 / Chapter 1.3.2 --- All-Optical Power-Controlled Optical Packet Buffer for All-Optical Packet-Switched Networks --- p.18 / Chapter 1.3.3 --- Signaling Techniques for Power-Efficient Operation of WDM-PON --- p.19 / Chapter 1.4 --- Organization of Thesis --- p.19 / Chapter Chapter 2 --- Path Tracing Scheme for All-Optical Packet-Switched Networks --- p.21 / Chapter 2.1 --- Introduction --- p.21 / Chapter 2.2 --- Path Tracing Using Prime-Number Tags --- p.26 / Chapter 2.2.1 --- Network Node Tracing --- p.26 / Chapter 2.2.2 --- Network Link Tracing --- p.28 / Chapter 2.2.3 --- Network Looping Problem --- p.29 / Chapter 2.3 --- Optical Implementation --- p.30 / Chapter 2.4 --- Experimental Results --- p.38 / Chapter 2.5 --- Multi-Level Amplitudes Of The Label --- p.41 / Chapter 2.6 --- Required Maximum Fiber Delay --- p.44 / Chapter 2.7 --- Summary --- p.47 / Chapter Chapter 3 --- A Novel Fiber-based Variable All-Optical Packet Buffer based on Self-Phase Modulation Induced Spectral Broadening --- p.48 / Chapter 3.1 --- Introduction --- p.48 / Chapter 3.2 --- Input signal power dependent delay --- p.51 / Chapter 3.3 --- Numerical Simulation Studies --- p.54 / Chapter 3.4 --- Experimental Results --- p.64 / Chapter 3.5 --- Discussion --- p.68 / Chapter 3.6 --- Summary --- p.71 / Chapter Chapter 4 --- A Cost-effective Pilot-Tone-based Monitoring Technique for Power Saving in RSOA-based WDM-PON --- p.73 / Chapter 4.1 --- Introduction --- p.73 / Chapter 4.2 --- Proposed System Architecture --- p.75 / Chapter 4.3 --- Experimental Setup and Result --- p.78 / Chapter 4.4 --- Power Saving Efficiency Calculation --- p.82 / Chapter 4.5 --- Summary --- p.86 / Chapter Chapter 5 --- Conclusions and Future Work --- p.87 / Chapter 5.1 --- Conclusions --- p.87 / Chapter 5.2 --- Future Work --- p.88 / Bibliography --- p.90 / Publications during PhD Study --- p.98

The growing widespread use of data communication networks has led to increased reliance on the availability of network resources. The network itself is a critical resource which must be managed in a timely and effective manner. In order to manage the network effectively, the network manager must have powerful tools that present network information in a fast and logical way. The work presented here is the design and development of a network management tool for Sytek broadband networks. The Sytek Network Management Package (SNMP) incorporates a commercial database management system, Rbase System V, and menu oriented management functions for the University of Arizona Sytek broadband networks. The SNMP is written in C and executes on a PC connected to the Sytek network. The SNMP allows a network manager to manage both the Sytek LocalNet 20 and System 2000 networks.

by Hung Cheung Kwok. / Thesis (M.S.)--Chinese University of Hong Kong, 1993. / Includes bibliographical references (leaves [34]). / ACKNOWLEDGEMENTS / ABSTRACT / TABLE OF CONTENTS / Chapter 1. --- INTRODUCTION --- p.3 / Chapter 1.1 --- PROVISION OF NETWORK SERVICES --- p.3 / Chapter 1.2 --- THE CURRENT ENVIRONMENT FOR SERVICE PROVISION --- p.3 / Chapter 1.3 --- THE COMING ENVIRONMENT FOR SERVICE PROVISION --- p.6 / Chapter 1.4 --- THE ROLE OF THE ASSISTANT SYSTEM --- p.8 / Chapter 1.5 --- OVERVIEW OF THE THESIS --- p.10 / Chapter 2 . --- OVERALL DESIGN --- p.12 / Chapter 2.1 --- INFERENCE ENGINE --- p.14 / Chapter 2 .2 --- KNOWLEDGE BASES --- p.14 / Chapter 2.3 --- COMMAND GENERATOR --- p.15 / Chapter 2.4 --- USER INTERFACE --- p.16 / Chapter 2.5 --- HOST INTERFACE --- p.16 / Chapter 3 . --- KNOWLEDGE BASE DESIGN --- p.18 / Chapter 4. --- INFERENCE ENGINE DESIGN --- p.21 / Chapter 5. --- IMPLEMENTATION --- p.24 / Chapter 5.1 --- SYSTEM DESIGN --- p.24 / Chapter 5.2 --- KNOWLEDGE BASE MAINTENANCE --- p.24 / Chapter 5.3 --- MANUAL MODE --- p.26 / Chapter 5.4 --- AUTOMATIC MODE --- p.27 / Chapter 5.5 --- INTERFACE FUNCTIONS --- p.29 / Chapter 6. --- CONCLUSIONS --- p.31 / REFERENCES / LIST OF FIGURES / Chapter F1. --- THE SCHEMATICS OF THE INTELLIGENT SYSTEM / LIST OF TABLES / Chapter T1. --- STRUCTURE OF SERVICE INFORMATION FILE (SIF) / Chapter T2. --- STRUCTURE OF WORK CODE FILE (WCF) / Chapter T3. --- STRUCTURE OF MAPPING FILE (SIF-PRF´ØMAP) / Chapter T4. --- DATABASE RECORDS OF SIF一PRF.MAP / APPENDICES / Chapter A1. --- KNOWLEDGE BASE LIST FOR FEATURE ANALYSIS (CHK_SIF) / Chapter A2. --- KNOWLEDGE BASE LIST FOR WORK CODE INTERPRETATION (CHK一WCF) / Chapter A3. --- KNOWLEDGE BASE LIST FOR FILE SENDING MONITORING (CHK 一SND) / Chapter A4. --- A SAMPLE RUN OF THE SYSTEM

by Feng Gang. / Thesis (Ph.D.)--Chinese University of Hong Kong, 1998. / Includes bibliographical references (p. 169-181). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.

Organizations become more homogenous when they adapt to the external environment for survival and competitiveness. Institutional theorists call this phenomenon "isomorphism," which is a constraining process that forces organizations---through coercive, mimetic, or normative pressures---to resemble each other when facing the same set of environmental conditions. In recent years, concerns about cost-efficiency and standardization of information technology (IT) have led organizations to rely more heavily on IT to enhance their business operations. Enterprise resource planning (ERP) systems enable the tight integration of all necessary business functions into a single system. Typically, a database, designed to standardize organizational IT platforms and business processes, is shared throughout an organization. The high adoption rate of ERP systems among the biggest corporations has pressured other organizations to adopt ERP systems. Information system (IS) researchers call this phenomenon "technical isomorphism". / This study examines the effects of ERP implementation on organizational homogeneity from the viewpoint of institutional theory. Through mediating factors, such as the extent of ERP implementation and software adaptation, this study also investigates the effects of organizational homogeneity on the core competencies of user-organizations. It addresses four important issues: (a) whether institutional pressures lead to organizational homogenization; (b) whether institutional pressures affect the extent of ERP implementation in organizations; (c) whether the extent of ERP implementation affects software adaptation and subsequently, homogenization; and (d) whether the core competencies of organizations are ultimately affected by the adoption of technology. / This study's findings contribute to our understanding on the effects of ERP implementation in organizations, particularly on the IT and business activities. They open a whole new arena of research into the impact of technology on organizational abilities, providing a new set of constructs, relationships, antecedents, and dependent variables. Moreover, this study provides the necessary evidence on the occurrence of homogenization, its origins, and its consequences. It also provides valuable guidelines in finding a balance between conformity and retaining the uniqueness of companies, which is regarded as a source of core competencies. Thus, the research findings can help organizations redirect their focus and efforts into ERP implementation, saving millions of dollars in the process. / Liu, Kar Wai Connie. / Adviser: Vincent S. Lai. / Source: Dissertation Abstracts International, Volume: 72-04, Section: A, page: . / Thesis (Ph.D.)--Chinese University of Hong Kong, 2010. / Includes bibliographical references (leaves 141-152). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. Ann Arbor, MI : ProQuest Information and Learning Company, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. Ann Arbor, MI : ProQuest Information and Learning Company, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese; appendix 8.3 and 8.4 in Chinese.