Title page for ETD etd-04052007-132833


Document Type Master's Dissertation
Author Van der Westhuizen, Tilana
Email vdwestti@eskom.co.za
URN etd-04052007-132833
Document Title Survivability and resilience mechanisms in modern optical fibre systems
Degree MEng
Department Electrical, Electronic and Computer Engineering
Supervisor
Advisor Name Title
Mr L Nederlof
Prof F W Leuschner
Keywords
  • system failures engineering
  • fiber optics
  • optical fiber communication
Date 2006-04-24
Availability unrestricted
Abstract

Optical fibre networks play an increasingly prominent role in communications. As networks grow in size and complexity, the probability and impact of failures increase. In this dissertation, different optical network concepts, survivability and resilience methods are considered.

Link and Path failures are discussed and Static Path Protection (SPP), Shared Backup Path Protection (SBPP), as well as Path Restoration (PR) are investigated. A Shared Backup Path Protection model and simulation tool is designed and implemented. This implementation is compared with other studies. Dual-link failures are considered under specific network topologies. Shortest Path algorithms are used to reprovision optimal routes for backup protection.

Results and conclusions are discussed in detail, giving valuable insight into resilience methods. Availability and protectability are discussed and evaluated as measures of resilience and network survivability. Results vary between compromising little availability and bringing a significant improvement in availability.

It is concluded that the implementation of SBPP is a necessity in highly-meshed networks with high availability needs, but doesn’t necessarily provide the best solution for sparsely-connected networks. The additional cost involved in the implementation needs to be considered carefully.

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