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Network operators are migrating towards IP over WDM architectures. In such multi-layer networks, it is necessary to efficiently use the resources available from both layers in order to provide coordinated recovery strategies. Thanks to the development of the control plane (GMPLS and ASON), it is feasible to set up and tear down lightpaths automatically, so the WDM layer itself can support failure...
With the increased role of resilience in modern networks, the existing quality of service is required to be expanded with service availability and maintainability. Recently, studies have shown the strong limitation of the common availability metrics for measuring the user's quality of experience. In this article a joint specification of QoS definitions with a sophisticated service resilience characterization...
IST project NOBEL2 results on resilience strategies for next-generation optical transport networks are presented, paving the way towards cost-effective, scalable and easy-to-maintain multi-service network architectures.
Network operators have been facing big changes since IP traffic began overwhelming other kinds of data transport. On the other hand, access networks are continuously improving and it is anticipated that bandwidth demands exponentially increase within next decade to cope with triple-play service requirements. The first level of aggregation, namely metro access networks, can become the bottleneck if...
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