Synchronous Optical Network

Résumé

SONET (ou Synchronous Optical NETwork en anglais) est un modèle de norme de transmission optique. C'est un protocole de la couche 1 du modèle OSI utilisé principalement aux États-Unis et normalisé par l'organisme Telcordia, au début des années 1990. Son équivalent international est la norme SDH avec laquelle il a progressivement convergé. Initialement, SONET était normalisé pour des transmissions téléphoniques. La technique générale de transport utilisé sur les réseaux SONET/SDH est PoS (Packet over SONET). SONET et SDH ont été modifiés à partir de 2002 pour s'adapter aux protocoles IP, ATM et Ethernet. Voir aussi *Hiérarchie numérique synchrone Catégorie:Protocole de télécommunication Catégorie:Protocole réseau sur la couche physique

Source officielle

https://fr.wikipedia.org/wiki/Synchronous_Optical_Network

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Cours associés (1)

Hardware compilation is the process of transforming specialized hardware description languages into circuit descriptions, which are iteratively refined, detailed and optimized. The course presents algorithms, tools and methods for hardware compilation and logic synthesis.

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Performance overview of the quasi-synchronous operation mode in optical burst switching (OBS) networks

Christian Gaumier, Oscar Pedrola Escriba, Sébastien Rumley

Optical burst switching (OBS) is able to operate under both asynchronous and synchronous burst departures. Although the asynchronous approach is generally assumed in OBS owing to its simplicity and low technical requirements, it has been shown that performance improvements, in terms of the overall burst loss probability, can be achieved under synchronous operation. Moreover, when effective contention resolution mechanisms are applied, such improvements are significant. Since perfect synchronization is not a viable solution, we propose a novel operation mode with relaxed technical requirements, the quasi-synchronous (QS) operation. In this paper, the performance of the QS operation mode is evaluated by an exact analytic expression, assuming a Poisson burst arrival process and a single-wavelength scenario. This mathematical analysis is completed with numerical results that validate its accuracy. Furthermore, we tackle the issue of not having well-aligned clock information between network nodes by proposing a novel re-synchronization mechanism for OBS networks. Finally, a performance study of the QS operation under different deflection routing techniques is presented. The results show that our novel QS approach achieves significant performance benefits with respect to the asynchronous operation while avoiding the architectural complexity of the synchronous scheme.

2011

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Modeling and performance analysis of IP access interface in optical packet switched networks

The article analyzes the influence of the IP access interface on the packet loss probability and delay times in the optical packet switched network. The network and node model have been proposed, and the assembler and hold features have been included in the analysis. It has been shown that the increase of the maximum optical packet sizes, as well as holding feature as contention resolution mechanism, decrease the packet loss ratio, but introduce delays at the optical network access points. The modeling and analysis were. based on discrete event simulation assuming self-similar traffic sources.

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2004

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Modeling and performance analysis of IP access interface in optical transmission networks with packet switching

The article analyzes the influence of the Internet Protocol (IP) access interface on the packet loss probability and delay times in the optical packet switched network. The network and node model have been proposed, and the structure of the IP access interface, including assembler and holder, have been included in the analysis. It has been shown that the increase of the maximum optical packet sizes, as well as use of the holding feature as contention resolution mechanism, decrease the packet loss probability, but introduce delays at the optical network access points. Modeling and analysis were based on the discrete event simulation assuming self-similar traffic sources. IP packet lengths were modeled using empirical data.

2006

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