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A differentiated optical services model for WDM networks

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3 Author(s)
Golmie, N. ; Nat. Inst. of Stand. & Technol., Gaithersburg, MD, USA ; Ndousse, T.D. ; Su, D.H.

This article addresses the issues of scalable end-to-end QoS in metropolitan DWDM networks serving as transit networks for IP access networks. DWDM offering a few wavelengths has been deployed in the past in backbone networks to upgrade point-to-point transmission where sharing is based on coarse granularity. This type of DWDM backbone network, offering a few light-paths, provides no support for QoS services traversing the network. As DWDM networks with larger numbers of wavelengths penetrate the data-centric metro environment, specific IP service requirements such as priority restoration, scalability, dynamic provisioning of capacity and routes, and support for coarse-grain QoS capabilities will have to be addressed in the optical domain in order to achieve end-to-end QoS over a DWDM network. We propose a QoS service model in the optical domain called differentiated optical services (DoS) based on a set of optical parameters that captures the quality and reliability of the optical lightpath.

Published in:

Communications Magazine, IEEE  (Volume:38 ,  Issue: 2 )

Date of Publication:

Feb. 2000

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