Assessment of blocking performance in unidirectional and bi-directional wavelength routed ring networks

  • Authors:

  • Mário M. Freire;Henrique J. A. da Silva

  • Affiliations:

  • Department of Computer Science, University of Beira Interior, Rua Marqués d'Ávila e Bolama, 6201-001 Covilhã, Portugal;Department of Electrical Engineering, University of Coimbra - Site II, 3030-290 Coimbra, Portugal

  • Venue:
  • Journal of High Speed Networks
  • Year:
  • 2003

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Abstract

In this paper, we present a comparison of the blocking performance in unidirectional and hi-directional wavelength routed ring networks. This performance comparison reveals that, for the same load per node and equal number of wavelengths per link, the performance of a unidirectional ring with N nodes is very close to the performance of a bi-directional ring with 4N nodes. This comparison also suggests that, for the same number of nodes and equal number of wavelengths per link, the performance of a unidirectional ring network with a load per node of ρ is similar to the performance of a bi-directional ring network with a load per node of 4ρ. An explanation is presented for this fourfold capacity increase of bi-directional rings over unidirectional rings, regarding number of nodes or loads per node.