Metropolitan optical networks are undergoing major transformations to continue being able to provide services that meet the requirements of the applications of the future. The arrival of the 5G will expand the possibilities for offering IoT applications, autonomous vehicles, and smart cities services while imposing strong pressure on the physical infrastructure currently implemented, as well as on static traffic engineering techniques that do not respond in an agile way to the dynamic and heterogeneous nature of the upcoming traffic patterns. In order to guarantee the strictest quality of service and quality of experience requirements for users, as well as meeting the providers' objectives of maintaining an acceptable trade-off between cost and performance, new architectures for metropolitan optical networks have been proposed in the literature, with a growing interest starting from 2017. However, due to the proliferation of a dozen of new architectures in recent years, many questions need to be investigated regarding the planning, implementation, and management of these architectures, before they could be considered for practical application. This work presents a comprehensive survey of the new proposed architectures for metropolitan optical networks. Firstly, the main data transmission systems, equipment involved, and the structural organization of the new metro ecosystems are discussed. The already established and the novel architectures are presented, highlighting its characteristics and application, and comparative analysis among these architectures is carried out identifying the future technological trends. Finally, outstanding research questions are drawn to help direct future research on the field. Among the conclusions of this survey, the application of flexible spectrum allocation technologies seems to be the right, and necessary, evolution path for metropolitan optical network architectures.
This proposal is a suggestion to the Brazilian Association of Technical Standards (ABNT), in NBR 15290, over accessibility Digital TV. The focus is to discuss and establish a standard navigation scheme to accessible NCL applications to be annexed to NBR 15290. This navigation scheme can be used as guidelines for developers to create NCL applications for people with a visual or hearing disability.
As redes ópticas metropolitanas (MON) estão passando por grandes transformações para continuar a oferecer serviços que atendam aos requisitos das aplicações do futuro. O tráfego dessas aplicações apresenta um comportamento diferente em cada horário do dia e em cada área específica da rede. As soluções agnósticas desse contexto não consideram tal distribuição desigual de tráfego. Este trabalho apresenta uma solução de roteamento e alocação de espectro ciente da área no contexto de redes ópticas metropolitanas elásticas (MEON). Tal proposta alcança o dobro de redução do bloqueio de largura de banda na rede como um todo, e pelo menos 1% de redução nas áreas compreensivas (CA) e residenciais (RA) existentes na metro.
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