Telefnica O2 Germany GmbH & Co. OHG

Displaying 1-9 of 9 results

  • White Papers // Apr 2014

    Spinner: Scalable Graph Partitioning for the Cloud

    Several organizations, like social networks, store and routinely analyze large graphs as part of their daily operation. Such graphs are typically distributed across multiple servers, and graph partitioning is critical for efficient graph management. Existing partitioning algorithms focus on finding graph partitions with good locality, but they disregard the pragmatic...

    Provided By Telefnica O2 Germany GmbH & Co. OHG

  • White Papers // Aug 2012

    Sharing the Cost of Backbone Networks Cui Bono?

    The authors study the problem of how to share the cost of a backbone network among its customers. A variety of empirical cost-sharing policies is used in practice by backbone network operators but very little ever reaches the research literature about their properties. Motivated by this, they present a systematic...

    Provided By Telefnica O2 Germany GmbH & Co. OHG

  • White Papers // May 2012

    Multi-Layer Restoration in Hierarchical IP/MPLS Over WSON Networks

    Network operators are migrating to a multi-layer architecture with IP/MPLS equipment and optical nodes. Thanks to the advent of reconfigurable optical equipment and a multilayer control plane, current 1+1 node protection at the IP layer in each location is not required anymore. This work studies the network availability in a...

    Provided By Telefnica O2 Germany GmbH & Co. OHG

  • White Papers // Apr 2012

    On the Energy Efficiency of Survivable Optical Transport Networks With Flexible-Grid

    Telecommunications operators are continuously exploring new alternatives to upgrade their networks in order to handle the ever increasing Internet traffic demand. However, a capacity upgrade is often accompanied by an increase in energy consumption, which affects not only the OPerational EXpenditures (OPEX) of the telecom carriers, but also their carbon...

    Provided By Telefnica O2 Germany GmbH & Co. OHG

  • White Papers // Feb 2012

    Benefits of Optical Packet Switching for Router By-Pass in Metro Networks

    This paper builds on previous work on IP off-loading over multigranular photonic switching technologies to provide an in-depth techno-economic analysis for a real metro scenario. The main contribution of the paper is that it demonstrates a 42% capital cost reduction in favour of the proposed IP-offloading architecture, when compared against...

    Provided By Telefnica O2 Germany GmbH & Co. OHG

  • White Papers // Feb 2012

    Routing in Medium Term Optical Networks in ICT STRONGEST

    In Wavelength Switched Optical Networks (WSONs) with dynamic path establishment and wavelength assignment, connection requests between a source and a destination node are negotiated at light-path connection set up, where a specific wavelength is assigned for data transportation among the two nodes that may span multiple links. In order to...

    Provided By Telefnica O2 Germany GmbH & Co. OHG

  • White Papers // Dec 2011

    Cost-Effective Sub-Wavelength Solution for Data Centre Location in Scaled Next-Generation Networks

    This paper summarises the modelling results obtained with a sub-wavelength optical packet switching technology, called OPST (Optical Packet Switch and Transport), when compared against an IPoDWDM solution. In particular, the impact of data centre location in the network on the network cost is studied for two architectures based on different...

    Provided By Telefnica O2 Germany GmbH & Co. OHG

  • White Papers // Jun 2011

    Implementation of Multi-Layer Techniques Using FEDERICA, PASITO and OneLab Network Infrastructures

    This paper describes an implementation of multilayer techniques using the network infrastructure provided by FEDERICA, PASITO and OneLab projects. FEDERICA project provides a network infrastructure, based on virtualization capabilities in both network and computing resources, which creates custom-made virtual environments. PASITO is a layer- 2 network that connects universities and...

    Provided By Telefnica O2 Germany GmbH & Co. OHG

  • White Papers // Feb 2010

    Analyzing The Role Of Dimension Arrangement For Data Visualization in Radviz

    The Radial Coordinate Visualization (Radviz) technique has been widely used to effectively evaluate the existence of patterns in highly dimensional data sets. A crucial aspect of this technique lies in the arrangement of the dimensions, which determines the quality of the posterior visualization. Dimension Arrangement (DA) has been shown to...

    Provided By Telefnica O2 Germany GmbH & Co. OHG

  • White Papers // Aug 2012

    Sharing the Cost of Backbone Networks Cui Bono?

    The authors study the problem of how to share the cost of a backbone network among its customers. A variety of empirical cost-sharing policies is used in practice by backbone network operators but very little ever reaches the research literature about their properties. Motivated by this, they present a systematic...

    Provided By Telefnica O2 Germany GmbH & Co. OHG

  • White Papers // Apr 2012

    On the Energy Efficiency of Survivable Optical Transport Networks With Flexible-Grid

    Telecommunications operators are continuously exploring new alternatives to upgrade their networks in order to handle the ever increasing Internet traffic demand. However, a capacity upgrade is often accompanied by an increase in energy consumption, which affects not only the OPerational EXpenditures (OPEX) of the telecom carriers, but also their carbon...

    Provided By Telefnica O2 Germany GmbH & Co. OHG

  • White Papers // Feb 2012

    Routing in Medium Term Optical Networks in ICT STRONGEST

    In Wavelength Switched Optical Networks (WSONs) with dynamic path establishment and wavelength assignment, connection requests between a source and a destination node are negotiated at light-path connection set up, where a specific wavelength is assigned for data transportation among the two nodes that may span multiple links. In order to...

    Provided By Telefnica O2 Germany GmbH & Co. OHG

  • White Papers // Feb 2012

    Benefits of Optical Packet Switching for Router By-Pass in Metro Networks

    This paper builds on previous work on IP off-loading over multigranular photonic switching technologies to provide an in-depth techno-economic analysis for a real metro scenario. The main contribution of the paper is that it demonstrates a 42% capital cost reduction in favour of the proposed IP-offloading architecture, when compared against...

    Provided By Telefnica O2 Germany GmbH & Co. OHG

  • White Papers // May 2012

    Multi-Layer Restoration in Hierarchical IP/MPLS Over WSON Networks

    Network operators are migrating to a multi-layer architecture with IP/MPLS equipment and optical nodes. Thanks to the advent of reconfigurable optical equipment and a multilayer control plane, current 1+1 node protection at the IP layer in each location is not required anymore. This work studies the network availability in a...

    Provided By Telefnica O2 Germany GmbH & Co. OHG

  • White Papers // Dec 2011

    Cost-Effective Sub-Wavelength Solution for Data Centre Location in Scaled Next-Generation Networks

    This paper summarises the modelling results obtained with a sub-wavelength optical packet switching technology, called OPST (Optical Packet Switch and Transport), when compared against an IPoDWDM solution. In particular, the impact of data centre location in the network on the network cost is studied for two architectures based on different...

    Provided By Telefnica O2 Germany GmbH & Co. OHG

  • White Papers // Jun 2011

    Implementation of Multi-Layer Techniques Using FEDERICA, PASITO and OneLab Network Infrastructures

    This paper describes an implementation of multilayer techniques using the network infrastructure provided by FEDERICA, PASITO and OneLab projects. FEDERICA project provides a network infrastructure, based on virtualization capabilities in both network and computing resources, which creates custom-made virtual environments. PASITO is a layer- 2 network that connects universities and...

    Provided By Telefnica O2 Germany GmbH & Co. OHG

  • White Papers // Feb 2010

    Analyzing The Role Of Dimension Arrangement For Data Visualization in Radviz

    The Radial Coordinate Visualization (Radviz) technique has been widely used to effectively evaluate the existence of patterns in highly dimensional data sets. A crucial aspect of this technique lies in the arrangement of the dimensions, which determines the quality of the posterior visualization. Dimension Arrangement (DA) has been shown to...

    Provided By Telefnica O2 Germany GmbH & Co. OHG

  • White Papers // Apr 2014

    Spinner: Scalable Graph Partitioning for the Cloud

    Several organizations, like social networks, store and routinely analyze large graphs as part of their daily operation. Such graphs are typically distributed across multiple servers, and graph partitioning is critical for efficient graph management. Existing partitioning algorithms focus on finding graph partitions with good locality, but they disregard the pragmatic...

    Provided By Telefnica O2 Germany GmbH & Co. OHG