Carrier Grade Ethernet Versus SDH in Optical Networks: Planning Methods and CAPEX Comparisons.
ABSTRACT The new Carrier Ethernet services offered by providers require not only a huge amount of bandwidth, but also a more flexible access to bandwidth that the traditional transport networks, based on circuit-switching, can hardly provide. Carriers have nowadays the option of migrating to new layer-2 frame-switched technologies developed ad hoc to support Carrier Ethernet. An important question is whether this migration is really cost effective. This paper deals with the problem of designing a transport network able to support Carrier Ethernet. We compare two network models, one based on layer-2 switching and Ethernet interfaces, the other based on legacy circuit switching and SDH interfaces. Minimization of investments for network interfaces is carried out for the two models, given the same static-traffic matrix to be supported. Both an ILP formulation and a heuristic method are proposed to solve the design problem. The results presented for comparison are obtained by applying the optimization procedures to a case-study network.
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ABSTRACT: We propose an energy management framework to optimize the energy consumption of networks using the Multiple Spanning Tree Protocol such as Carrier Grade Ethernet networks. The objective is to minimize the energy consumption of nodes and links while considering QoS constraints. The energy management is done through the Multiple Spanning Tree Protocol (MSTP) by choosing from a given set the most appropriate Spanning Trees and the most appropriate edges to operate while respecting the traffic demands. A trade-off framework between energy consumption and network performance is proposed. Results show that it is possible to achieve a good traffic engineering while operating the network closer to the minimum energy value.Computer Networks 08/2012; 56(17):3666 - 3681. DOI:10.1016/j.comnet.2012.08.002 · 1.28 Impact Factor
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ABSTRACT: Since its definition by Metro Ethernet Forum (MEF), Carrier Ethernet (CE) service is becoming more and more important for service providers and network operators. The recently-developed MPLS-TP technology can be adopted to efficiently support CE over the Optical Transport Network (OTN). In order to reduce energy consumption and complexity, OTN relies on optical bypass at switching nodes. This makes optical signals subject to the physical-layer impairments. Driven by these considerations we propose a CE-based multi-layer network design approach, defining a reference node architecture and providing two heuristic algorithms to optimize resources jointly at the MPLS-TP and at the optical layer, while taking physical impairments into account. We finally show results of the application of the design algorithms on case-study networks.
Conference Paper: A Novel GPON-based Transmission Hierarchy for Metropolitan-area Network[Show abstract] [Hide abstract]
ABSTRACT: In this paper, we propose a GPON-based transmission hierarchy (GTH) for metro network. Then a simulation testbed is constructed to study the GTH's performance on supporting wireless backhaul service. Simulation results show that, compared with MSTP, GTH reduces the cost of network expansion significantly for its higher transmission efficiency.Communications and Photonics Conference and Exhibition (ACP), 2010 Asia; 01/2011