Abstract
The main objective of this work is to analyze the evolution trends for the architecture of optical networks, discuss the state of the art for the protocols required for its development and evaluate the various efforts being carried out by different institutions as the ITU (International Telecommunications Union), lETF (Internet Engineering Task Force) and OIF (Optical Internetworking Forum) in order to achieve standardization. Optical networks arose in the early eighties with the use of the monomode fiber optic cables and were further developed with the introduction of a new technological base composed by new types of optical fibers, optical amplifiers, DWDM (dense wavelength division multiplexing) systems and optical components such as add/drop multiplexers and optical cross-connects. The introduction of these components will make possible the evolution from the simple point-to-point WDM connections to the all optical networks. In this work we analyze how the applications will interact with this physical layer. Such interaction has been demonstrated to be a challenge within the framework of the current architecture of data networks, aiming at offering solutions for the transport of a great volume of traffic in an efficient manner. With this goal in mind, the use of technologies such as MPLS (multiprotocol label switching) and its evolution, the generalized MPLS (GMPLS) is discussed. Finally, we present the in progress lTV version for the architecture optical networks, addressing its merging with the GMPLS.
Highlights
The main objective of this work is to analyze the evolution trends for the architecture of optical networks, discuss the state of the art for the protocols required for its development and evaluate the various efforts being carried out by different institutions as the International Telecommunication Union (ITU) (International Telecommunications Union), lETF (Internet Engineering Task Force) and Optical Intemetworking Forum (OIF) (Optical Internetworking Forum) in order to achieve standardization
We present the in progress lTV version for the architecture optical networks, addressing its merging with the generalized MPLS (GMPLS)
Tal LSP pode, por exemplo, comelYar em uma rede IP, ser transportado por uma rede SONET/SDH e ser comutado por meio de urn deterrninado comprimento de onda em uma fibra optica
Summary
A arquitetura de uma rede pode ser entendida como a descri~ao dos componentes que a integram, suas fun~6es e inter-rela~6es [3]. a protocolo e urn conjunto de regras que disciplinam a comunica~ao entre equipamentos e garante que as transferencias de informa~ao sejam ordenadas e isentas de erros. as diversos protocolos existentes sao organizados em camadas, cada uma delas com uma ou mais fun~6es especfficas, como aplica~ao, comuta~ao, roteamento e transporte. No caso do padrao GbE, a encapsula~ao de pacotes IP sobre este padrao acrescenta ao cabe~alho uma quantidade significativa de bytes [27]. A engenharia de trMego trata da alocalYao eficiente de fluxos de trMego IP nos recursos fisicos existentes em uma rede, enquanto atende simultaneamente as exigencias de qualidade desejada (atrasos e niveis de protelYao, por exemplo) para 0 transporte das informalYoes contidas nos pacotes.
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