Author: Franck ChevalierPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Performance Evaluation of the Clockwork Routing Scheme in Optical Packet Switching Networks
Author: Franck ChevalierPerformance Evaluation of Optical Packet Switching Technology
Author: Tuan Dung NguyenPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
The rapid growth in client application demands, in terms of bandwidth and (QoS), has motivated the deployment of the optical technology at Metro Access and Metro Core Networks. More diverse and more intelligent optic devices are required for efficiently management of huge capacity in the network. The explosion in demand for network bandwidth is mainly due to the growth in data traffic whose nature is also becoming more and more complex. In general, most of service-based traffics are transported in networks which are now being dominated by the optical switching technology. Nevertheless, such technology has some drawbacks such as inflexible and non-scalable properties. (OPS), which offers significant benefits in terms of both network efficiency and control scalability, may overcome these limitations. This has motivated the orientation from optical circuit switching to optical packet switching in the future network infrastructure. In reality, optical packet switching ring (OPSR) networks, which combine the packet switching technology with the well-known advantages of ring topology such as fast service restoration in cases of failure and high gain of statistical traffic multiplexing over the ring, appear to be the technology of choice for the next generation of Metro Area Networks. A new OPSR architecture which is based on the all-optical infrastructure that offers intelligent features with lower cost while maximizing processing time and is now considering being replaced existing opto-electronic architectures such as Resilient Packet Ring, have been presented in the scope of the dissertation. The key element of such network is Packet Optical Add/Drop Multiplexer (POADM) which is implemented inside a ring node, allowing the node to exploit the optical transparency. This dissertation hence focuses on the performance evaluation of the new generation of OPSR network. In this dissertation, we have investigated the performance analysis (in terms of packet delay and queue-length distribution of access nodes) of an optical synchronous bus-based metropolitan network supporting fixed-size packets. We have modeled each access node by an embedded discrete time Markov chain (EDTMC). The solution of the EDTMC allows us to compute the approximate probability that access nodes on the bus “see” free slots in the transit line. Using a recursive analysis technique, we approximately outline the mean waiting time of client packets coming from the upper layer as well as an approximate queue-length distribution of local buffers at access nodes in two cases: with and without QoS guarantees. To characterize the performance of an asynchronous OPSR network, we have evaluated the impact of Optical fixed-Size Packet Creation on the network performance without and with different quality of services (QoS) requirements. Performance analysis of such systems has allowed us to identify a reasonable combination of some parameters (timeslot duration, timer expiration values, profile of client traffic and network load) which may be able to improve the bandwidth utilization of the network for a given traffic matrix. The most important point that we have mentioned in the dissertation is the comparison of two architectural approaches: Variable Length - Optical Packet Format (VL-OPF) model supporting empty packets versus Fixed Length - Optical Packet Format (FL-OPF) model. In addition to CoS-Upgrade Mechanism (CUM) which is proposed to improve the filling ratio of the optical container, we have proposed a novel mechanism named Dynamic CoS-Upgrade Mechanism (DCUM) where timers are dynamically changed according to the state of the local buffer of network nodes and the traffic circulating in the network, in order to create containers with a high filling ratio while limiting the time needed for their creation.
Quality of Service in Optical Packet Switched Networks
Author: Akbar G. RahbarPublisher: John Wiley & Sons
ISBN: 111905656X
Category : Science
Languages : en
Pages : 452
Book Description
This book is a comprehensive study on OPS networks, itsarchitectures, and developed techniques for improving its qualityof switching and managing quality of service. The bookincludes: Introduction to OPS networks, OOFDM networks, GMPLS-enabledoptical networks, QoS in OPS networks Hybrid contention avoidance/resolution schemes in bothlong-haul and metro optical networks Hybrid optical switching schemes
Novel Schemes and Performance Analysis of Ultrafast Packet-switching Transparent Optical Networks
Author: Alberto BononiPerformance Analysis of High-speed Optical Packet Switching in High Performance Computing and Datacentre Networks
Author: Wang JingyanPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
The massive growth in datacentre traffic, due to a huge increase in the deployment of data-intensive applications, is forcing datacentre infrastructure to migrate away from conventional electronic packet-switched networks, where capacity scaling imposes significant financial and technical constraints, and to evolve towards more advanced architectures. Motivated by this, new optical switching technologies and networking architectures, capable of providing very large bandwidth capacity, high scalability, high switching speed and high energy efficiency, are being targeted for building next-generation high-performance datacentre and High Performance Computing (HPC) networks. Optical packet switching technology is considered to be a long-term solution to meet these design challenges, as it can exploit fully the enormous potential capacity enabled by optics and support high switching flexibility at packet level. In this thesis, new wavelength-routed optical packet switching architectures, which exploit the functionalities of key optical switching components such as Tunable Wavelength Converters (TWCs), Arrayed Waveguide Gratings (AWGs) and Wavelength Selective Switches (WSSs), to realise all-optical switching, are proposed for use as next-generation datacentre and HPC networks. To maximise the efficiency of the proposed optical switching architecture, a dynamic bandwidth provisioning algorithm, which allocates switch resources to traffic demands based on application requirements, is developed to further enhance network flexibility, resource utilisation and network performance. Moreover, based on the proposed switch architectures, a large-scale high-performance datacentre network with flexible central control is modelled, with a view of determining the optimal network topology and traffic scheduling methods. This flexible network architecture employs a modular design and combines transparent optical packet switches, based on Arrayed Waveguide Grating (AWG) routers, and a hybrid congestion control scheme using recirculating Fibre Delay Lines (FDLs) along with novel packet retransmission schemes. The work carried out in this thesis indicates that the proposed network structure not only provides high scalability, capable of hosting hundreds of thousands of severs, but also delivers high bandwidth utilisation and network provisioning flexibility. The network offers a promising and viable networking solution to address current and future application needs in datacentre and HPC environments.
Design and Analysis of Optical Packet-switched Networks
Author: Shun YaoHigh-performance Packet Switching Architectures
Author: Itamar ElhananyPublisher: Springer Science & Business Media
ISBN: 1846282748
Category : Technology & Engineering
Languages : en
Pages : 239
Book Description
Internet traffic is increasing by at least 200% per year and this is the first book to report on the current state-of-the-art of packet-switching architectures. The book to covers the subject in a comprehensive survey and presents contributions from the leading researchers in industry and universities. A mix of theoretical and practical material makes this book an essential reference for researchers in academia as well as industrial engineers.
Feasibility Study of Optical Packet Switching Network
Author: Ivan KotuliakPublisher:
ISBN:
Category :
Languages : en
Pages : 129
Book Description
Optical technology supplies capabilities necessary to create an optical packet switching network providing large bandwidth, high-speed data transmission and service differentiation. The aim of this thesis work is a logical performance analysis of optical packet-switching network.Studied network is based on the synchronous optical packet switching. Main part of this work deals with the analysis of two architectures: interior switch and access node. Two interior node architectures are proposed: a memory less switch and switch incorporating memory buffers based on the fiber delay lines. The access node is studied with focus on its ingress functions. Two algorithms of optical packet creation are considered: assembly and segmentation.Performance of proposed nodes is evaluated using simulation tool and discrete-time Markov chain. We show that optical packet switching network performs very well under different conditions and it is one of the promising solutions for the future high-speed networks.
High Performance Switches and Routers
Author: H. Jonathan ChaoPublisher: John Wiley & Sons
ISBN: 0470113944
Category : Computers
Languages : en
Pages : 633
Book Description
As Internet traffic grows and demands for quality of service become stringent, researchers and engineers can turn to this go-to guide for tested and proven solutions. This text presents the latest developments in high performance switches and routers, coupled with step-by-step design guidance and more than 550 figures and examples to enable readers to grasp all the theories and algorithms used for design and implementation.
Quality of Service in Optical Packet Switched Networks
Author: Akbar G. RahbarPublisher: John Wiley & Sons
ISBN: 1119056853
Category : Science
Languages : en
Pages : 451
Book Description
This book is a comprehensive study on OPS networks, its architectures, and developed techniques for improving its quality of switching and managing quality of service. The book includes: Introduction to OPS networks, OOFDM networks, GMPLS-enabled optical networks, QoS in OPS networks Hybrid contention avoidance/resolution schemes in both long-haul and metro optical networks Hybrid optical switching schemes