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OTN switching
Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, Department of Telematics.
2011 (English)MasteroppgaveStudent thesis
Abstract [en]

Increasing traffic volumes in the Internet put strict requirements to the architecture of optical core networks. The exploding number of Internet users, and massive increase in Internet content consumption forces carriers to constantly upgrade and transform their core networks in order to cope with the traffic growth. The choice of both physical components and transport protocols in the core network is crucial in order to provide satisfactorily performance. Data traffic in the core network consists of a wide variety of protocols. OTN is a digital wrapper technology, responsible for encapsulating existing frames of data, regardless of native protocol, and adding additional overhead for addressing, OAM and error control. The wrapped signal is then transported directly over wavelengths in the optical transport network. The common OTN wrapper overhead makes it possible to monitor and control the signals, regardless of the protocol type being transported. OTN is standardized by the ITU through a series of recommendations, the two most important being ITU-T G.709 - "Interfaces for the Optical Transport Network", and ITU-T G.872 - "Architecture of the Optical Transport Network". OTN uses a flexible TDM hierarchy in order to provide high wavelength utilization. The TDM hierarchy makes it possible to perform switching at various sub-wavelength bit rates in network nodes. An introduction to OTN and an overview of recent progress in OTN standardization is given in the thesis. An OTN switch which utilizes the flexible multiplexing hierarchy of OTN is proposed, and its characteristics is tested in a network scenario, comparing it to the packet switched alternative. Simulation results reveal that OTN switching doesn’t provide any performance benefits compared to packet switching in the core network. OTN switches do however provide bypass of intermediate IP routers, reducing the requirements for router processing power in each network node. This reduces overall cost, and improves network scalability. An automatically reconfigurable OTN switch which rearranges link subcapacities based on differences in output buffer queue lengths is also proposed and simulated in the thesis. Simulation results show that the reconfigurable OTN switch has better performance than both pure packet switching and regular OTN switching in the network scenario.

Place, publisher, year, edition, pages
Institutt for telematikk , 2011. , 138 p.
Keyword [no]
ntnudaim:6183, MSTCNNS Master of Telematics - Communication Networks and Networked Services (2 year), Nett og tjenestekvalitet
URN: urn:nbn:no:ntnu:diva-14136Local ID: ntnudaim:6183OAI: diva2:447286
Available from: 2011-10-11 Created: 2011-10-11

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