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Ara es mostren els items 48-67 de 95

    • Impact of transponders and regenerators wake-up time on sleep-mode enabled translucent optical networks 

      Pagès Cruz, Albert; Tornatore, Massimo; Perelló Muntan, Jordi; Spadaro, Salvatore; Morea, Annalisa (2014)
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      Sleep-mode enabled transponders and regenerators yield to substantial energy savings; however, their non-negligible wake-up time may degrade the network performance. We show that an appropriate dimensioning of the devices ...

    • Inter-core crosstalk impact on migration planning from elastic optical networks to spectrally-spatially flexible optical networks 

      Lechowicz, Piotr; Rumipamba Zambrano, Rubén Darío; Perelló Muntan, Jordi; Spadaro, Salvatore; Walkowiak, Krzysztof (Optical Society of American (OSA), 2019)
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      We study inter-core crosstalk (ICXT) impact on migration planning toward spectrally-spatially flexible optical networks considering 22-core multi-core fiber. Results reveal that 55-70% of links need to be upgraded when ...

    • Joint content placement and lightpath routing and spectrum assignment in CDNs over elastic optical network scenarios 

      Perelló Muntan, Jordi; Walkowiak, Krzysztof; Klinkowski, Miroslaw; Spadaro, Salvatore; Careglio, Davide (2016-03-01)
      Article
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      In this work, we address the problem of jointly deciding the placement of the contents delivered by a Content Distribution Network (CDN) among the available data centers, together with the allocation of the lightpaths ...

    • Lightpath fragmentation for efficient spectrum utilization in dynamic elastic optical networks 

      Pagès Cruz, Albert; Perelló Muntan, Jordi; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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      The spectrum-sliced elastic optical path network (SLICE) architecture has been presented as an efficient solution for flexible bandwidth allocation in optical networks. An homologous problem to the classical Routing and ...

    • Link vs. opto-electronic device sleep mode approaches in survivable green optical networks 

      Perelló Muntan, Jordi; Morea, Annalisa; Spadaro, Salvatore; Tornatore, Massimo (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      Energy savings of link and OE device sleep mode approaches are compared in 1:1 protected optical networks, together with a hybrid solution combining both of them. The proposed hybrid solution can decrease network energy ...

    • Migration planning from elastic optical networks to spectrally-spatially flexible optical networks 

      Lechowicz, Piotr; Rumipamba Zambrano, Rubén Darío; Perelló Muntan, Jordi; Spadaro, Salvatore; Walkowiak, Krzysztof (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      We focus on a migration planning from elastic to spectrally-spatially flexible optical networks by upgrading regular with SDM-capable ROADMs. Our most promising strategy reveals that by migrating 30% of the regular ROADMs ...

    • Multicast routing from a set of data centers in elastic optical networks 

      Molnár, Miklós; Le, Dinh Danh; Perelló Muntan, Jordi; Solé Pareta, Josep; McArdle, Conor (2019-11)
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      Accés obert
      This paper introduces the Multi-Server Multicast (MSM) approach for Content Delivery Networks (CDNs) delivering services offered by a set of Data Centers (DCs). All DCs offer the same services. The network is an Elastic ...

    • On Avoiding-Minimizing Burst Collisions in Optical Burst-Switched Networks without Wavelength Conversion 

      Triay Marquès, Joan; Perelló Muntan, Jordi; Cervelló Pastor, Cristina; Spadaro, Salvatore (IEEE, 2009-06-28)
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      In this paper, a new MAC protocol for OBS networks is introduced, described and evaluated. Into operation, DAOBS avoids burst collisions in the core of the network by controlling the way OBS nodes access the optical channel. ...

    • On the benefits of probabilistic constellation shaping in Flex-Grid/MCF dynamic optical backbone networks 

      Perelló Muntan, Jordi; Gené Bernaus, Joan M.; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2021)
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      In this paper, we propose a novel methodology for estimating the worst-case spectral efficiency (b/s/Hz) of end-to-end paths across a Multi-Core Fiber (MCF)-enabled Flex-Grid optical network, accounting for physical link ...

    • On the benefits of resource disaggregation for virtual data centre provisioning in optical data centres 

      Pagès Cruz, Albert; Serrano, Ruben; Perelló Muntan, Jordi; Spadaro, Salvatore (2017-07-15)
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      Accés obert
      Virtual Data Centre (VDC) allocation requires the provisioning of both computing and network resources. Their joint provisioning allows for an optimal utilization of the physical Data Centre (DC) infrastructure resources. ...

    • On the benefits of RINA over programmable optical networks for dynamic and smart resource management 

      Leon Gaixas, Sergio; Perelló Muntan, Jordi; Grasa, Eduard; Careglio, Davide; Spadaro, Salvatore (2015)
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      In this paper, we describe the basics of the Recursive InterNetwork Architecture (RINA) and its advantages as a packet transport technology over programmable optical networks. In particular, its seamless integration over ...

    • On the experimentation of the novel GCMR multicast routing in a large-scale testbed 

      Careglio, Davide; Papadimitriou, Dimitri; Agraz Bujan, Fernando; Sahhaf, Sahel; Perelló Muntan, Jordi; Tavernier, Wouter (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      Originally defined in the 90s, multicast is nowadays (re)gaining interest given the increasing popularity of multimedia streaming/content traffic and the explosion of cloud services. In fact, multicast yields bandwidth ...

    • On the performance of dynamic source aggregation of sub-wavelength connections in EONs 

      Sayyad Khodashenas, Pouria; Comellas Colomé, Jaume; Perelló Muntan, Jordi; Spadaro, Salvatore; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      In elastic optical networks, heterogeneous traffic demands are typically supported by a single type of bandwidth-variable transmitters, which is not always spectrum and cost efficient. In light of this, we recently proposed ...

    • On the scalability of dynamic Flex-Grid/SDM optical core networks 

      Rumipamba Zambrano, Rubén Darío; Perelló Muntan, Jordi; Gené Bernaus, Joan M.; Spadaro, Salvatore (2018-09-04)
      Article
      Accés obert
      Future optical core networks realizing Flex-Grid and Space Division Multiplexing (Flex-Grid/SDM) will be key to effectively cope with the rapid growth of the Internet traffic, thanks to their superior capacity and spectrum ...

    • Optimal allocation of virtual optical networks for the future internet 

      Pagès Cruz, Albert; Perelló Muntan, Jordi; Spadaro, Salvatore; Garcia Espin, Joan Antoni; Ferrer Riera, Jordi; Figuerola, Sergi (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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      Optical network infrastructures can be partitioned into multiple parallel, dedicated virtual networks for a physical infrastructure sharing purpose. However, different transport technologies may impact in both the amount ...

    • Optimal VDC service provisioning in optically interconnected disaggregated data centers 

      Pagès Cruz, Albert; Perelló Muntan, Jordi; Agraz Bujan, Fernando; Spadaro, Salvatore (2016-07)
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      Accés obert
      Virtual data center (VDC) is a key service in modern data center (DC) infrastructures. However, the rigid architecture of traditional servers inside DCs may lead to blocking situations when deploying VDC instances. To ...

    • Optimal virtual slice composition toward multi-tenancy over hybrid OCS/OPS data center networks 

      Pagès Cruz, Albert; Pérez Sanchis, Miguel; Peng, Shuping; Perelló Muntan, Jordi; Simeonidou, Dimitra; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2015-10-01)
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      Accés obert
      Multi-tenancy is a key feature of modern data centers. It allows for the existence of multiple independent virtual infrastructures, called virtual slices, on top of the same physical infrastructure, each of them specially ...

    • Orchestrated SDN-based VDC provisioning over multi-technology optical data centre networks 

      Spadaro, Salvatore; Pagès Cruz, Albert; Agraz Bujan, Fernando; Montero, Rafael; Perelló Muntan, Jordi (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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      In this paper, we describe some scenarios and technologies that have been proposed to cope with the requirements of current and next generation data centre infrastructure. In particular, we discuss the extensions that have ...

    • Performance evaluation of a hybrid OBS/OCS network with QoS differentiation based on packet loss/delay requirements 

      Perelló Muntan, Jordi; Guinea, Nuria de; Spadaro, Salvatore; Junyent Giralt, Gabriel; Comellas Colomé, Jaume (2010)
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      This paper introduces and evaluates a hybrid OBS/OCS switch for Quality of Service (QoS) differentiation in next-generation all-optical transport networks. Depending on their QoS requirements, incoming IP packets are ...

    • Performance evaluation of an all-optical OCS/OPS-based network for intra-data center connectivity services 

      Pagès Cruz, Albert; Jiménez, Sergio; Perelló Muntan, Jordi; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
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      As the size of Data Centers (DCs) and the amount of information managed by them grows, nowadays electronic-based intra-Data Center Networks (DCNs) start to become a limiting factor, not providing enough scalability nor ...