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  • 1. Martini, Barbara
    et al.
    Baroncelli, Fabio
    Castoldi, Piero
    Muchanga, Américo Francisco
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    The Service Oriented Optical Network (SOON) project2005In: Transparent Optical Networks, 2005, Proceedings of 2005 7th International Conference, NEW YORK: IEEE , 2005, p. 429-432Conference paper (Refereed)
    Abstract [en]

    The Service Oriented Optical Network is a project committed to introduce the concept of service virtualization in optical metro/core networks, by improving the Automatic Switched Transport Network (ASTN) architecture thanks to the introduction of an extra functional layer, namely Service Plane, designed according to the ITU-T Intelligent Network Conceptual Model. An implementation of the Service Plane is presented highlighting the software architecture and the technology details. In particular it is applied to a testbed that implement a VPN topology request from a client application.

  • 2.
    Muchanga, Americo Francisco
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Interdomain Traffic Engineering and Faster Restoration in Optical Networks2006Doctoral thesis, comprehensive summary (Other scientific)
    Abstract [en]

    Internet traffic has surpassed voice traffic and is dominating in transmission networks. The Internet Protocol (IP) is now being used to encapsulate various kinds of services. The new services have different requirements than the initial type of traffic that was carried by the Internet network and IP. Interactive services such as voice and video require paths than can guarantee some bandwidth level, minimum delay and jitter. In addition service providers need to be able to improve the performance of their networks by having an ability to steer the traffic along the less congested links or paths, thus balancing the load in a uniform way as a mechanism to provide differentiated service quality.

    This needs to be provided not only within their domains but also along paths that might traverse more than one domain. For this to be possible changes have been proposed and some are being applied to provide quality of service (QoS) and traffic engineering (TE) within and between domains.

    Because data networks now carry critical data and there are new technologies that enable providers to carry huge amount of traffic, it is important to have mechanisms to safeguard against failures that can render the network unavailable.

    In this thesis we propose and develop mechanisms to enable interdomain traffic engineering as well as to speed up the restoration time in optical transport networks. We propose a mechanism, called abstracted path information, that enable peering entities to exchange just enough information to engage in QoS and TE operations without divulging all the information about the internal design of the network. We also extend BGP to carry the abstracted information. Our simulations show that BGP could still deliver the same performance with the abstracted information.

    In this thesis we also develop a method of classifying failures of links or paths. To improve the restoration time we propose that common failures be classified and assigned error type numbers and we develop a mechanism for interlayer communication and faster processing of signalling messages that are used to carry notification signals. Additionally we develop a mechanism of exchanging the failure information between layers through the use of service primitives; that way we can speed up the restoration process. Finally we simulate the developed mechanism for a 24 node Pan American optical transport network.

  • 3.
    Muchanga, Americo Francisco
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Orava, Fredrik
    Haralson, Joanna
    Inter-domain routing in optical networks2005In: OPTICAL NETWORKS AND TECHNOLOGIES, 2005, Vol. 164, p. 263-270Conference paper (Refereed)
    Abstract [en]

    In this paper we present a mechanism for obtaining an abstraction of network topology in optical networks in order to compute an end-to-end lightpath across multiple domains.

  • 4.
    Muchanga, Americo
    et al.
    KTH, School of Information and Communication Technology (ICT), Electronic, Computer and Software Systems, ECS.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Orava, Fredrik
    KTH, School of Information and Communication Technology (ICT).
    Inter-layer communication for improving restoration time in optical networks2006In: Optical Fiber Communication Conference, 2006 and the 2006 National Fiber Optic Engineers Conference. OFC 2006, WASHINGTON: OPTICAL SOC AMERICA , 2006, p. 1455-1461Conference paper (Refereed)
    Abstract [en]

    The restoration time in high capacity optical networks has to be kept as short as possible in order to avoid a huge loss of data. This paper discusses several methods to improve restoration time in optical networks and we propose the use of error codes that will trigger immediately the appropriate layer recovery mechanism, which is the best to handle a given fault.

  • 5.
    Muchanga, Américo
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Bagula, Antoine B
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Inter-layer communication for faster restoration in a 10Gigabit Ethernet based network2006In: Reliability of Optical Fiber Components, Devices, Systems, and Networks III, 2006, Vol. 6193Conference paper (Refereed)
    Abstract [en]

    The restoration time in high capacity optical networks has to be kept as short as possible in order to avoid a huge loss of data. This paper discusses several methods to improve restoration time in optical networks and we propose mechanisms of implementing such inter-layer communication in order to decrease restoration time for a 10Gigabit Ethernet based network.

  • 6.
    Muchanga, Américo Francisco
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Bagula, Antoine
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    On using fast signalling to improve restoration in multilayer networks2006In: Optical Fiber Communication and the National Fiber Optic Engineers Conference, 2007. OFC/NFOEC 2007., 2006, p. 1-12Conference paper (Refereed)
    Abstract [en]

    We present a fast signalling scheme where intra-layer signalling and inter-layer communication are used to reduce the recovery operation time. Simulation reveals the efficiency of the scheme compared to normal signalling strategies.

  • 7.
    Muchanga, Américo Francisco
    et al.
    KTH, School of Information and Communication Technology (ICT).
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Orava, Fredrik
    KTH, School of Information and Communication Technology (ICT).
    Providing QoS in end to end Optical Networking. 2006Report (Other academic)
  • 8.
    Muchanga, Américo
    et al.
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Wosinska, Lena
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Orava, Fredrik
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Haralson, Joanna
    KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
    Requirements for interdomain routing in optical networks2005In: National Fiber Optic Engineers Conference (NFOEC) 2005, Optical Society of America, 2005Conference paper (Refereed)
    Abstract [en]

    In this paper we present a mechanism for obtaining an abstraction of network topology in optical networks in order to compute an end-to-end lightpath across multiple domains in GMPLS networks. We also propose changes to BGP in order to carry the abstracted information. Furthermore we use Opnet to simulate MPLS operation as a special case of GMPLS.

1 - 8 of 8
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