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Open AccessArticle

Optical Space Switches in Data Centers: Issues with Transport Protocols

School of Computing, Ulster University, Coleraine BT52 1SA, UK
Radio and Optical Communications Laboratory, Dublin City University, Dublin D9, Ireland
School of Computing Sciences, University of East Anglia, Norwich NR4 7TJ, UK
Authors to whom correspondence should be addressed.
Photonics 2019, 6(1), 16;
Received: 14 December 2018 / Revised: 1 February 2019 / Accepted: 15 February 2019 / Published: 22 February 2019
(This article belongs to the Special Issue Lightwave Communications and Optical Networks)
A number of new architectures for data centre networks employing reconfigurable, SDN controlled, all-optical networks have been reported in recent years. In most cases, additional capacity was added to the system which unsurprisingly improved performance. In this study, a generalised network model that emulates the behaviour of these types of network was developed but where the total capacity is maintained constant so that system behaviour can be understood. An extensive emulated study is presented which indicates that the reconfiguration of such a network can have a detrimental impact on Transmission Control Protocol (TCP) congestion control mechanisms that can degrade the performance of the system. A number of simple scheduling mechanisms were investigated and the results show that an on-demand scheduling mechanism could deliver a throughput increase of more than ∼50% without any increase in total installed network capacity. These results, therefore, indicate the need to link the network resource management with new datacentre network architectures. View Full-Text
Keywords: optical space switch; transport layer; SDN optical space switch; transport layer; SDN
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Abu-Tair, M.; Perry, P.; Morrow, P.; McClean, S.; Scotney, B.; Parr, G.; Biswas, M.I. Optical Space Switches in Data Centers: Issues with Transport Protocols. Photonics 2019, 6, 16.

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