Conference Paper

On the dimensioning of survivable optical metro/core networks with dual-homed access

  • Jose Luis Izquierdo-Zaragoza /
  • Marija Furdek /
  • Avishek Nag /
  • Paolo Monti /
  • Lena Wosinska /
  • Pablo Pavon-Marino
Conference Proceeding cp
IEEE International Conference on High Performance Switching and Routing, HPSR
  • Volumen: 2016-June
  • Fecha: 01 June 2016
  • ISSN: 23255609 23255595
  • ISBN: 9781479998715
  • Source Type: Conference Proceeding
  • DOI: 10.1109/HPSR.2015.7483089
  • Document Type: Conference Paper
  • Publisher: IEEE Computer
© 2015 IEEE.Long-reach passive optical networks (LR-PONs) are able to effectively support the growing demand of traffic originating from residential and business customers. Failures of metro/core (M/C) nodes serving the traffic to/from the access networks covered by LR-PONs, may potentially affect hundreds or thousands of customers. One way of guaranteeing 100% survivability from single-node failures is to apply dual-homing, where each LR-PON is connected to two M/C nodes, and combine it with node-disjoint dedicated-path protection (DPP). In this paper, we present a new approach to provide network survivability against single M/C node failures. Instead of applying dedicated path protection (DPP) strategy, which can require huge amount of extra resources, we combine an unprotected network design with a dynamic multilayer restoration algorithm. Our aim is to determine a suitable amount of resource overbuild (in terms of extra transponders) needed to provide average connection availability close to that guaranteed by DPP. Preliminary results show that dimensioning for the worst-case scenario among a set of predefined M/C node failures, i.e., the one disrupting the highest number of connections, yields to a cost-effective strategy requiring up to 35% less transponders than DPP, while offering the same average connection availability.

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