Document Type Master's Dissertation Author Gazendam, Albert Dirk email@example.com URN etd-03292004-181733 Document Title The design of physical and logical topologies for wide-area WDM optical networks Degree MEng Department Electrical, Electronic and Computer Engineering Supervisor
Advisor Name Title Prof F W Leuschner Keywords
- modified gravity model
- traffic grooming
- node weighting
- economic activity
- network management
- network reliability
- multi-level network model
- hub node
- Ward linkage
- intra/inter-cluster traffic ratio
- design methodology
- wavelength division multiplexing
- wide-area optical network
Date 2003-12-15 Availability unrestricted AbstractThe objective of this dissertation is to investigate the factors that influence the design of wide-area wavelength division multiplexing (WDM) optical networks. Wide-area networks are presented as communication networks capable of transporting voice and data communication over large geographical areas. These networks typically span a whole country, region or even continent.
The rapid development and maturation of WDM technology over the last decade have been well-received commercially and warrants the development of skills in the field of optical network design.
The fundamental purpose of all communication networks and technologies is to satisfy the demand of end-users through the provisioning of capacity over shared and limited physical infrastructure. Consideration of the business aspects related to communications traffic and the grooming thereof are crucial to developing an understanding of customer requirements in terms of the selection and quality of services and applications. Extensive communication networks require complex management techniques that aim to ensure high levels of reliability and revenue generation.
An integrated methodology is presented for the design of wide-area WDM optical networks. The methodology harnesses physical, logical, and virtual topologies together with routing and channel assignment (RCA) and clustering processes to enhance objectivity of the design process. A novel approach, based on statistical clustering using the Ward linkage as similarity metric, is introduced for solving the problem of determining the number and positions of the backbone nodes of a wide-area network, otherwise defined as the top level hub nodes of the multi-level network model. The influence of the geographic distribution of network traffic, and the intra/inter-cluster traffic ratios are taken into consideration through utilisation of modified gravity models and novel network node weighting.
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