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Connection availability analysis of span-restorable mesh networks

Zhou, Ling ; Held, Marcel ; Sennhauser, Urs

In: Photonic Network Communications, 2007, vol. 14, no. 2, p. 135-148

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    Titre
    • Connection availability analysis of span-restorable mesh networks
    Auteur
    • Zhou, Ling. Swiss Federal Laboratories for Materials Testing and Research (EMPA), CH-8600, Duebendorf, Switzerland
    • Held, Marcel. Swiss Federal Laboratories for Materials Testing and Research (EMPA), CH-8600, Duebendorf, Switzerland
    • Sennhauser, Urs. Swiss Federal Laboratories for Materials Testing and Research (EMPA), CH-8600, Duebendorf, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Photonic Network Communications, 2007, vol. 14, no. 2, p. 135-148. Springer US; http://www.springer-ny.com
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:321351
    Summary
    Dual-span failures are the key factor of the system unavailability in a mesh-restorable network with full restorability of single-span failures. Availability analysis based on reliability block diagrams is not suitable to describe failures of mesh-restorable networks with widely distributed and interdependent spare capacities. Therefore, a new concept of restoration-aware connection availability is proposed to facilitate the analysis. Specific models of span-oriented schemes are built and analyzed. By using the proposed computation method and presuming dual-span failures to be the only failure mode, we can exactly calculate the average connection unavailability with an arbitrary allocation rule for spare capacity and no knowledge of any restoration details, or the unavailability of a specific connection with known restoration details. Network performance with respect to connection unavailability, traffic loss, spare capacity consumption, and dual failure restorability is investigated in a case study for an optical span-restorable long-haul network