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Access Networks & Workshops, 2007. AccessNets '07. Second International Conference on

Date 22-24 Aug. 2007

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  • e-Techbook

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  • AccessNets 2007 General Chair Message

    Page(s): ii
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  • [Copyright notice]

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    Freely Available from IEEE
  • Steering Committee

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    Freely Available from IEEE
  • Organizing Committee

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    Freely Available from IEEE
  • Technical Program Committee

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    Freely Available from IEEE
  • Keynote Speaker 1

    Page(s): vii - viii
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  • Keynote Speaker 2

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  • AccessNets 2007 Conference

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  • WDM EPON: Future applications and services

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    Supporters of the recently proposed "Copper-PON" (CuPON) raised the intriguing question why DSL companies would spend enormous amounts of time and money to deploy fiber when the existing copper they are replacing has much higher data rates than they anticipate selling within decades? In this paper, we try to answer this question from different angles. After reviewing the tradition and avantgarde of PONs, we elaborate on the merits of WDM EPONs and their evolution to support future applications and services in an efficient and cost-effective manner. View full abstract»

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  • A new control plane for next-generation WDM-PON access systems

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    Point-to-point or point-to-multipoint optical access systems are now considered as a viable alternative to xDSL technologies for broadband services. Point-to-multipoint WDM-PONs are the most advanced solution in this matter. Multiple architectures have been proposed since a few years for Next Generation WDM PON (NG-WDM-PON) operating on an hybrid TDMA (Time Division Multiple Access) and WDMA (Wavelength Division Multiple Access) mode. For that purpose, three key optoelectronic devices are considered: reflective modulators, AWG (Arrayed Waveguide Gratings) routers and tunable transceivers. The major investigations in this domain are mainly focused on physical layer aspects and on MAC protocols. In this paper, we propose an original control plane for NG-WDM-PON operating at two timescales: microscopic and macroscopic. The former deals with traditional packet access whereas the latter aims at two objectives. The first objective is to assign connections to upstream optical channels in order to optimize network utilization. The latter enables to reallocate dynamically the number of optical channels to the various PONs of the system. Numerous numerical results are presented in order to outline the benefit of this control plane. It becomes then possible to shift optical resources among the various geographical areas of the system according to their medium term activity. View full abstract»

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  • A delay-based provisioning for Ethernet passive optical networks

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    With the mass availability of Ethernet in local area networks (LANs) deployed globally and connecting LANs to metropolitan area networks (MANs) and wide area networks (WANs) via the current transport technologies there is a need to resolve bandwidth gap between access networks and transport networks. One of the proposals to overcome the famous last mile issue is to use a passive optical network (PON) for this networking segment. Varieties of access methods are under development to increase the offered potential transport capacity of passive optical networks (PONs). With the emergence of Ethernet as the convergence layer in access networks, a new breed of PON, namely Ethernet PON (EPON) has evolved. Ethernet passive optical network is one of the potential solutions, offering to solve the bottleneck issue of access networks and adaptability of carrying Ethernet frames from subscriber to service provider. In this study we will review Ethernet Passive Optical Networks (EPONs) and then we propose a delay-based provisioning algorithm to be able to offer differentiated services and QoS in EPON. Mathematical analysis and simulation results will be presented also. View full abstract»

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  • Design and cost performance of WDM PONs for multi-wavelength users

    Page(s): 1 - 8
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    In many research labs, WDM PON access networks are considered as the next generation optical access. WDM PONs are more adaptable to future technologies than conventional PONs due to their high transmission capacity and their optical transparency. An elementary design concept is the paradigm that defines at least one wavelength for each user. A design tool is presented to analyze all technologically feasible WDM PON architectures and the cost performance based on an optical routing device, the Waveguide Grating Router. View full abstract»

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  • Enforcing bandwidth allocation and traffic conformance in Passive Optical Networks

    Page(s): 1 - 8
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    Broadband Passive Optical Network (PON) technology is a promising approach to establish a cost-effective access network. It is intended to provide a simple, low cost, scalable solution capable of delivering broadband access to end users, by passively sharing a single optical fibre transmission system between several customers. While downstream traffic is broadcasted to all customers, the access of upstream traffic to the fibre has to be arbitrated in order to avoid collisions. This arbitration mechanism and more generally, bandwidth distribution and QoS Provisioning, have been left to the implementer. An ideal Dynamic Bandwidth Allocation (DBA) should support both Committed Bandwidth and Best Effort services, with good control of the usual QoS characteristics (delay, jitter, loss) while utilizing the available bandwidth with good efficiency. It should also provide some isolation between end-users in order to offer a fair access to resources to all users. In this paper, we assume that each user negotiates classical traffic profiles for its upstream Committed Bandwidth traffic. We show that a DBA that does not take into account traffic conformance cannot isolate compliant users from non-compliant users, leading to QoS degradations of the upstream traffic for compliant users. We then propose a framework for taking into account the traffic conformance within the DBA used to arbitrate between users' demands. This study is illustrated on a priority based DBA designed for Ethernet Optical Networks (EPONs) View full abstract»

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  • AccessNets 2007 Conference

    Page(s): 1
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  • DSL—from A to V and back again (invited paper)

    Page(s): 1 - 5
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    Digital Subscriber Line (DSL) technology deployments have steadily increased in the last several years with current deployment counts topping over 200 million lines. While Asymmetric DSL (ADSL) technology continues to see the predominate share of access lines, Very high speed DSL (VDSL) has been in development for several years and has yet to overtake ADSL in the marketplace. While the increase in broadband communication demand has certainly fueled the growth of DSL, the deployment of the management protocol defined by the DSL Forum in Technical Report 69 (TR-69) offers the greatest potential for further increasing the speed by which deployments take place. With so much broadband communication technology available worldwide, are there other factors that should be considered to elongate DSL's hold on broadband into the future? We will attempt to consider the technology and the future of DSL by examining some of the historical advances that have led to DSL's existing success. View full abstract»

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  • Spectrum balancing for DSL with restrictions on maximum transmit PSD

    Page(s): 1 - 5
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    The importance of a power spectral density (PSD) mask restriction is often overlooked when optimizing the spectrum usage for multiuser digital subscriber lines (DSL) systems. However, by developing the optimization strategies based only on the PSD constraints (masks) we can tremendously reduce the computation complexity compared to the methods only based on the total power restriction. In this paper we introduce a mask-based spectrum balancing (MSB) algorithm and demonstrate the near optimum performance of this optimization approach. Furthermore, we show that besides standards compliance, PSD restriction is also needed to ensure the convergence of iterative spectrum balancing methods, which use dual decomposition optimization. View full abstract»

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  • Solving the generalized base station placement problem in the planning of Broadband Power Line Communications access networks

    Page(s): 1 - 8
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    Broadband Power Line Communications (B-PLC) technology is an alternative for broadband access networks, allowing bit rates up to currently 200Mbps. This technique uses the wiring of the low-voltage grid in order to offer to the users the telecommunications services, such as Internet. In this paper, the B-PLC planning process is sub-divided into two parts, which are the Generalized Base Station Placement (GBSP) and the PLC Channel Allocation Problem (P-CAP). This paper focuses on GBSP that is formulated as multi-objective combinatorial optimization and solved by the means of metaheuristics. Two optimization approaches are used to solve it: the classical approach based on single-objective optimization and the modern approach based on multi-objective optimization. Their performances are evaluated and compared with each other. View full abstract»

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  • A simple packet-classifier algorithm for QoS control in home networks

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    Recently, technology of appliances being networked together in the home has been deployed. To connect the Internet with the home, a home gateway plays an important role in a home network. However, to be more comfortable in the environment of living for the home by networked appliances and by controlling them, services such as quality of service (for short, QoS) supported applications, remote control of appliances, and safety/security of the home network still have not been realized enough. In such services, especially, the home gateway for QoS control needs to deal with real-time data in applications. In this paper, a packet-classifier algorithm for QoS control in the home gateway is proposed and its performance is evaluated. The proposed method is forwarded a real-time packet precedent. The feature of the proposed method is a simple and deterministic process for packets such as a round-robin manner. Simulation studies show that the proposed method can balance the process of the packets compared with the algorithm without QoS. View full abstract»

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  • On dynamic packet fragmentation for traffic integration over bandwidth-limited links

    Page(s): 1 - 8
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    We consider a home networking system for integrating packetized isochronous and best-effort traffic over a shared link with limited bandwidth, wherein the isochronous traffic comprises multiple isochronous flows, each associated with a periodic packet arrival process having a constant isochronous packet transmission period. In such a system, best-effort packets of variable size can render it impossible to guarantee QoS of the isochronous traffic. We propose a dynamic packet fragmentation method to integrate isochronous and best-effort traffic, in particular, fragmentation with fixed size or variable size frames. We show that the method effectively increases link utilization and best-effort traffic throughput, without violating the delay and jitter requirements for isochronous traffic. View full abstract»

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  • AccessNets 2007 Conference

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  • Delay analysis of ethernet passive optical networks with quasi-leaved polling and gated service scheme

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    Ethernet passive optical networks (EPONs) have emerged as a promising solution for the next generation access networks. As this technology matures, intensive research work is underway to enhance its functional capability and economic viability. This work evaluates the performance of EPONs from the analytical perspective. Specifically, this study elaborates an analytical framework to explore the performance characteristic of EPONs with quasi-leaved polling operation and gated resource allocation policy. By investigating the temporal relationship of multiple events successively occurred in such a system, a graphical presentation is developed to facilitate more quantitative analysis. Using classical queuing theory, we then derive closed-form expression for the average packet queuing delay and average queue length of the researched EPON model. Simulation experiments show that the derived analytical expression can precisely evaluate the network performance for memoryless traffic inputs, as well as to closely estimate the performance of lightly loaded network for bursty input traffic profiles. View full abstract»

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  • On triplexer design for next generation Ethernet Passive Optical Network (EPON) systems

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    The standardization effort targeting 10 Gbit/s EPON systems, together with the requirement for coexistence with the legacy IEEE 802.3ah compliant equipment, impose a set of very tight requirements in terms of wavelength allocation plan for future EPON systems and significant limitations in terms of triplexer design for optical network unit (ONU) modules, where 2 wavelength channels (or 3, when an analog video overlay is used on the downstream) must be properly separated with minimum power and quality loss, providing also a high quality transmission window for the upstream 1310 nm signal. In this paper, we look closer at the possible triplexer and filter design for emerging 10 Gbit/s EPON systems in the light of current IEEE 802.av Task Force activities and technical limitations of the wavelength division multiplexing (WDM) filter design process. View full abstract»

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  • Performance of rapid spanning tree protocol in access and metro networks

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    Ethernet provides a simple and low-cost solution at high bandwidth for access and metropolitan networks. The failover performance of bridges is indispensable of their applicability. Therefore, new IEEE protocols were developed and deployed in support of fast recovery. Rapid Spanning Tree Protocol (RSTP) is the current fault handling mechanism for generic topologies, which is included in the standards and implemented in each Ethernet bridge nowadays. There are many different statements about the recovery time of RSTP from the order of seconds down to the order of ten milliseconds. Most of these analyses only rely on simulation results assuming ideal conditions. This paper reports on the performance of RSTP in real environment. It presents an experimental performance analysis of RSTP based on measurement results from test networks comprising Ethernet bridges from various vendors. Basic processing times and hardware delays are deeply analyzed for small topologies and the performance of RSTP is then characterized for larger network topologies. View full abstract»

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