Performance advantages of resource sharing in polymorphic optical networks

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "Performance advantages of resource sharing in polymorphic optical networks"

Transcription

1 R. J. Durán, I. de Miguel, N. Merayo, P. Fernández, R. M. Lorenzo, E. J. Abril, I. Tafur Monroy, Performance advantages of resource sharing in polymorphic optical networks, Proc. of the 0th European Conference on Networks & Optical Communications (NOC 05), pp , Performance advantages of resource sharing in polymorphic optical networks Ramón J. Durán, Ignacio de Miguel, Noemí Merayo, Patricia Fernández, Rubén M. Lorenzo, Evaristo J. Abril, Idelfonso Tafur Monroy 2 Dpt. of Signal Theory, Communications and Telematic Engineering, University of Valladolid, Campus Miguel Delibes, 470 Valladolid (Spain). Tel: , Fax: , {ramon.duran, 2 COBRA Institute, Eindhoven University of Technology, P.O. Box 53, 5600 MB Eindhoven, The Netherlands, A polymorphic network simultaneously supports several optical switching paradigms in a single physical topology. In this way, efficient and flexible optical networks can be built as resources are shared, as long as it is possible, by the different paradigms supported by the network. We show that the integration of semi-static and dynamic wavelength routing paradigms in a polymorphic network brings advantages in terms of resource utilisation when compared with two networks one semi-static and one dynamic operating in parallel. We have made a simulation study, which shows that a polymorphic network has a lower blocking probability for dynamic connections (up to four orders of magnitude) while keeping the same performance for semi-static connections than the parallel networks.. Introduction A polymorphic multiservice optical network (PMON) [, 2] is an integrated architecture that combines several switching paradigms in a single physical network, allowing resource sharing, as long as possible, among all the supported paradigms. In this way, not only does the network optimally support different traffic types and services, but it also uses its resources effectively. The framework of polymorphic networks has its origin in the work by Qiao et al. [3]. These authors propose a network architecture sliced into several virtual optical networks (VON), each one designed to support a different class of service. For each VON, a dedicated set of resources is allocated as well as a different type of switches (slow/fast) depending on the service to be provided. In contrast with that proposal, the PMON is an integrated architecture which allows resource sharing. We have proposed two polymorphic networking architectures, the Optical Circuit- Switched Polymorphic Network (OCSPN) and the Labeled Optical Burst-Switched Polymorphic Network (LOBSPN) [, 2]. In this work, we focus on the former one. We briefly review the fundamentals of the Optical Circuit-Switched Polymorphic Network and then study, by means of simulation, whether it brings performance advantages when compared to parallel networks one semi-static and one dynamic. When using parallel networks, both the semi-static and the dynamic one must be independently overdimensioned in order to be able to accommodate future traffic growing and to allow smooth logical topology reconfiguration when the

2 network faces traffic changes. On the other hand, dimensioning a polymorphic network with extra resources is more effective as these are shared by all the switching paradigms supported by the network. Hence, the polymorphic optical network is expected to bring performance advantages. The evaluation of such advantages is the aim of this study. 2. Optical Circuit Switched Polymorphic Networks An OCSPN transmits data over lightpaths established in a static or dynamic way. It combines semi-static wavelength-routed optical networks (WRONs), dynamic WRONs, and wavelength-routed optical burst-switched networks (WR-OBS). The architecture of this polymorphic optical network consists of two layers, an access layer and a core layer. In the access layer, traffic aggregation and classification is performed by edge routers. The core layer is composed by a number of core routers, which transport data transparently in the optical domain. In semi-static WRONs, a limited set of lightpaths is established between pairs of edge routers, thereby embedding a virtual (or logical) topology in the physical topology. Moreover, if the traffic demand associated to this scheme changes, the virtual topology can be reconfigured in order to adapt efficiently to the new scenario. In the OCSPN, the semi-static WRON is chosen as an efficient solution for supporting bursty traffic such as best-effort Internet traffic. In dynamic WRONs, lightpaths between any two edge routers are established and released on user-demand on real time. This is the paradigm employed for services requesting dedicated circuits on user-demand in the OCSPN. In Wavelength-Routed Optical Burst-Switched Networks (WR-OBS) [4], packets are electronically aggregated into bursts and sent to the destination edge router once a lightpath has been established. The WR-OBS paradigm is used in an OCSPN for the provision of services requiring bounded delays due to the capability of this architecture to provide such guarantees. For each optical paradigm described above, a certain amount of network resources (wavelengths, fibres, transmitters, receivers, etc) are either statically or dynamically assigned. As next generation networks are characterised by a dynamic behaviour and variable traffic patterns, dynamic resource allocation is the most effective mechanism because it allows a seamless adaptation to traffic pattern changes. 3. Performance advantages using polymorphic optical networks We have made a simulation study to compare the performance of a polymorphic network with parallel networks, when the same amount of resources is used. In this study, we consider an Optical Circuit-Switched Polymorphic Network that only combines a semi-static and a dynamic WRON (with resource sharing), and compare with the utilisation of two parallel networks a semi-static and a dynamic WRON (without resource sharing). In particular, we analyse the traffic congestion when the semi-static paradigm is used, and the blocking probability for the dynamic paradigm. WR-OBS networks have not been explicitly included in this study, since they are also based on dynamic lightpath establishment, and our aim in this work is to analyse only the blocking probability of such dynamic paradigms.

3 3. Simulation scenario We have implemented both, an OCSPN architecture and a set of two parallel networks, following the NSFNet topology [5]. Thus, the network consists of 4 nodes, each one combining the functionality of an edge and a core router. A cable between two network nodes, say A and B, is assumed to consist of two unidirectional fibres (one for transmission from A to B, and another for transmission from B to A). Although we have performed simulations equipping the nodes with different numbers of transceivers, and equipping the fibres with different numbers of wavelengths, we will only show the results for the case of eight wavelengths per fibre and 3 transceivers per node (that is, the edge router section of each node is equipped with 3 transmitters and 3 receivers). A uniform traffic matrix has been used to obtain the logical topology employed in the semi-static paradigm. For dynamic traffic, we assume that lightpath requests arrive at the network according to an independent Poisson process with arrival rate λ. The holding time of a lightpath is exponentially distributed with mean T, and the source and destination nodes are randomly chosen according to a uniform distribution. Thus, the dynamic traffic load is obtained as ρ = λ T/(N (N-)), where N is the number of network nodes. The simulator has been implemented in the OMNeT++ platform [6], with the help of AKAROA-2 [7] in order to make a correct statistical treatment of data. Simulation results will be shown with a 95% confidence interval. 3.2 Control algorithms We have assumed that the networks employ centralised control. HLDA (Heuristic Logical topology Design Algorithm) [8] has been used to design the logical topology, and so to determine the set of resources required for the semi-static WRON, and AUR-EXHAUSTIVE [9] has been selected as the method for dynamic lightpath establishment. HLDA designs the logical topology with the aim of minimising network congestion (the traffic associated to the semi-static paradigm that is carried by the most loaded link in the virtual topology), and it takes into account both the traffic matrix and the availability of physical resources. Hence, HLDA not only provides the set of semistatic lightpaths to be established in the network, but also the routes and wavelengths that they must use. This property is very useful in the OCSPN since the logical topologies obtained can always be embedded in the physical topology. One drawback of HLDA is that it does not ensure that the virtual topology obtained is connected. This means that two or more disconnected virtual subnets could be formed within the network, so that traffic may not be routed from the source to the destination node if they belong to different subnets. However, all nodes should be able to communicate with all other network nodes. Therefore, in order to solve this problem, we have designed a correction algorithm. If the virtual topology obtained is not connected, we check whether splitting in two the virtual link (the semi-static lightpath) that carries the lowest load solves the problem. If it is not solved, we restart the design of the virtual topology by first establishing one Hamiltonian circuit [0] (as long as it is possible), and thus ensure that the virtual topology is connected. Then, we use HLDA to complete the design of the virtual topology.

4 In the parallel networks, we use the original definition of HLDA. The algorithm has two phases. In the first one, logical links are established attending to the traffic matrix, and in the second one, it randomly assigns free resources (as long as it is possible) in order to establish additional virtual links. However, even with this random assignation, some resources (wavelengths and transceivers) cannot be assigned and are therefore wasted. In the polymorphic network, we do not perform this random assignation but directly assign all the idle resources to the dynamic paradigm, so that we improve resource utilisation by employing resources that otherwise could be wasted. Once the logical topology has been designed and established, the traffic associated to the semi-static paradigm is routed from the source to the destination node following the shortest-paths in the virtual topology. We have used AUR-EXHAUSTIVE to solve the dynamic routing and wavelength assignment problem with the objective of minimising the call blocking probability, since it has proved to be an efficient algorithm regarding blocking performance [9]. 3.3 Performance advantages in the OCSPN In order to compare the performance of the OCSPN to that of the parallel networks, we have equipped both architectures with the same amount of resources, and have analysed the congestion obtained when using the semi-static paradigm, and the blocking probability when the dynamic paradigm is used. In all cases, the congestion was the same when using the OCSPN and the parallel networks. Hence, we will focus on the results for the blocking probability. In the first set of tests, we have fixed the number of wavelengths used for each paradigm, and have varied the number of transceivers in each node assigned to the semi-static paradigm (Tx static ). First of all, Figure shows the blocking probability obtained for the OCSPN and for the parallel networks, when three wavelengths have been reserved for the semi-static paradigm and the other five wavelengths have been assigned to the dynamic one. 0. Blocking Probability 0.0 = 0, Tx dynamic = 8, Tx dynamic E-3, Tx dynamic = 8, Tx dynamic = 0 = 0, Tx dynamic E-4 = 8, Tx dynamic, Tx dynamic = 8, Tx dynamic = 0 E Dynamic Traffic Load Figure : Blocking probability comparison when three wavelengths are reserved for the semi-static paradigm.

5 As shown in Figure, the OCSPN gets lower blocking probability than the parallel networks in all cases. The reason is that the polymorphic network also uses additional wavelengths and transceivers, initially assigned to the semi-static paradigm, but that finally were not used for establishing the virtual topology. In contrast, the parallel network devoted to dynamic circuit establishment could not use those resources, thereby leading to higher blocking probabilities than the OCSPN. Due to resource sharing in the polymorphic network, it is clear that an OCSPN will always get better or at least equal results in terms of blocking probabilities than the parallel networks. The question is under what circumstances is the gain in terms of blocking probability significant. In Figure 2, we show the results obtained when five wavelengths are used for the semi-static paradigm and three for the dynamic one. Again, the OCSPN obtains lower blocking probabilities than the parallel networks. However, in this case, when eight transmitters are assigned to the semi-static paradigm, the difference between the polymorphic and the parallel networks is less significant than in other scenarios. Blocking Probability = 0, Tx dynamic = 8, Tx dynamic, Tx dynamic = 8, Tx dynamic = 0 E-3 = 0, Tx dynamic = 8, Tx dynamic, Tx dynamic = 8, Tx dynamic = 0 E Dynamic Traffic Load Figure 2: Blocking probability comparison when five wavelengths are reserved for the semi-static paradigm. The explanation for this behaviour is as follows. If we assign three transceivers to the semi-static paradigm, the virtual topology established employs nearly all the transceivers reserved (40 out of 42) but only requires at most three wavelengths in any link. This means that there is a significant amount of idle wavelength channels (since five wavelengths were reserved in all the links). When the parallel networks are used, the dynamic paradigm cannot take advantage of these idle resources, but when the OCSPN is used, the dynamic paradigm has 74% additional wavelength channels (for a dynamic traffic load of 0.), leading to an improvement of more than four orders of magnitude in blocking probability when compared to the parallel networks. However, if we reserve eight transceivers for the semi-static paradigm, the virtual topology employs 9 out of the 2 available transceivers, and uses the five reserved wavelengths in many of the network links. Hence, in this case, the number of idle resources is lower than in the previous case, so that the dynamic paradigm in the OCSPN only receives 4% additional wavelength channels (when a dynamic

6 traffic load of 0. is considered). For this reason, the blocking probability for the OCSPN is very similar to that of the parallel networks. We have also performed a set of simulations fixing the amount of transceivers per node reserved for the semi-static paradigm, and varying the number of wavelengths used for each paradigm (W static and W dynamic ). Figure 3 shows the simulation results when eight transceivers per node are reserved for the semi-static paradigm and five for the dynamic one. Blocking Probability Parallel W static = 7, W dynamic = Parallel W static, W dynamic Parallel W static, W dynamic Parallel W static =, W dynamic = 7 E-3 OCSPN W static = 7, W dynamic = OCSPN W static, W dynamic OCSPN W static, W dynamic OCSPN W static =, W dynamic = 7 E Dynamic Traffic Load Figure 3: Blocking probability comparison when eight transceivers per node are reserved for the semi-static paradigm. As we have seen before, the OCSPN always obtains lower blocking probabilities than the parallel networks, but like in Figure 2, there are some configurations of wavelength reservation where the difference between the polymorphic and the parallel networks is less significant. If we assign one wavelength to the semi-static paradigm, the virtual topology established employs all wavelength channels reserved in the network, but there is a significant amount of idle transceivers. When the parallel networks are used, the dynamic paradigm cannot take advantage of these idle transceivers, but when the OCSPN is used, the dynamic paradigm has 20% additional transceivers (for a dynamic traffic load of 0.), leading to an improvement of more than four orders of magnitude in blocking probability when compared with the parallel networks. While in the scenario analysed in Figure 2 the OCSPN took advantage of idle wavelengths, in this case, it takes advantage of idle transceivers initially assigned to the semi-static paradigm. However, if we reserve five wavelengths for the semi-static paradigm, the virtual topology employs nearly all the wavelength channels (90%) and most of the assigned transceivers, for establishing the logical topology. Hence, in this case, the number of idle resources is lower than in the previous case, so that the dynamic paradigm in the OCSPN only receives 30% additional transceivers (for a dynamic traffic load of 0.). For this reason, the blocking probability for the OCSPN is very similar to that of the parallel networks. These results are summarised in Figure 4. It represents, for a dynamic traffic load of 0.2, the improvement in terms of blocking probability in the OCSPN when compared

7 to the parallel networks. This parameter is defined as OCSPN-Parallel = log 0 (p b_parallel /p b_ocspn ), where p b_parallel is the blocking probability in the parallel networks, and p b_ocspn the blocking probability in the OCSPN. This parameter represents how many orders of magnitude the blocking probability in the OCSPN is lower than that obtained in the parallel networks. Wavelengths reserved for the semi-static paradigm Scenarios with excess of wavelengths Scenarios 2 with excess of trasceivers Trasceivers per node reserved for the semi-static paradigm Best balanced resource assignation OCSPN - Parallel Figure 4: Improvement in terms of blocking probability between the OCSPN and the parallel networks for a dynamic traffic load of 0.2, and a uniform traffic matrix associated to the semi-static paradigm. As shown in Figure 4, if the number of wavelengths and transceivers assigned to the semi-static paradigm is well balanced, the improvement in terms of blocking probability between the OCSPN and the parallel networks is little or moderate (between zero and one order of magnitude). However, if the reservation of wavelengths and transceivers for the semi-static paradigm is not well balanced (there is an excess of one kind of resource when compared to the other one), as we have explained in previous examples, a lot of resources will be wasted if the parallel networks are used. In contrast, these resources are utilised by the dynamic paradigm in the OCSPN, leading to significant improvements in terms of blocking probability when compared to the parallel networks (several orders of magnitude). 4. Conclusion An Optical Circuit-Switched Polymorphic Network is a novel network architecture that provides service differentiation at the optical layer by supporting simultaneously three optical circuit-switching paradigms with different grades of dynamism in the same physical network. In this paper, we have made a simulation study to analyse the performance advantages obtained by using an OCSPN when only the semi-static and the dynamic paradigms are used, in comparison with the utilisation of two parallel networks. An OCSPN always obtains lower blocking probabilities (or at least equal) for the dynamic paradigm than employing parallel networks, while getting equal or very close performance in terms of congestion for the semi-static paradigm. The

8 improvement in terms of blocking probability is especially significant if the reservation of wavelengths and transceivers for the semi-static paradigm is not well balanced (there is an excess of one kind of resource when compared to the other one). In that scenario, a lot of resources will be wasted if the parallel networks are considered, while they are reused by the dynamic paradigm in the polymorphic network thereby leading to significant improvements in blocking probability. While a network could be initially properly designed, in a way that the number of wavelengths and transceivers assigned to the semi-static paradigm were wellbalanced, traffic changes may lead to an unbalanced situation. Hence, in parallel networks (since the semi-static network and the dynamic one are independent) a set of resources would be wasted, while the OCSPN would take advantage of these idle resources by using them for establishing dynamic connections. However, even in a balanced scenario, the OCSPN can get a lower blocking probability than the parallel networks (up to one order of magnitude). Moreover, as dynamic resource allocation is used in polymorphic networks, if the traffic pattern changes, the OCSPN can easily adapt to the new situation by reassigning the set of resources devoted to the semi-static and dynamic paradigms, as well as facilitating the process of virtual topology reconfiguration. Future research on polymorphic networks will analyse the performance advantages of the OCSPN when traffic pattern changes and the reconfiguration of the virtual topology are considered. Acknowledgements This work has been funded by the Spanish Ministry of Science and Technology (Ministerio de Ciencia y Tecnología) under Grant TIC References [] I. de Miguel, J.C. González, T. Koonen, R.J. Durán, P. Fernández, I. Tafur Monroy, Polymorphic Architectures for Optical Networks and their Seamless Evolution towards Next Generation Networks, Photonic Network Communications, vol. 8, no. 2, pp 77-89, Sept [2] I. de Miguel, F. González, D. Bisbal, J. Blas, J.C. González, J.C. Aguado, P. Fernández, J. Durán, R.J. Durán, R.M. Lorenzo, E.J. Abril, I. Tafur Monroy, Nature-inspired routing and wavelength assignment algorithms for optical circuit-switched polymorphic networks, Fiber and Integrated Optics, vol. 23, no. 2-3, pp 57-70, March-June [3] C. Qiao, Polymorphic control for cost-effective design of optical networks, European Transactions on Telecommunications, vol., no., pp. 04-4, Jan./Feb [4] M. Düser, P. Bayvel, Analysis of a dynamically wavelength-routed optical burst switched network architecture, Journal of Lightwave Technology, vol. 20, no. 4, pp , April [5] S. Baroni, P. Bayvel, Wavelength requirements in arbitrarily connected wavelength-routed optical networks, Journal of Lightwave Technology, vol. 5, no. 2, pp , Feb [6] OMNeT++ discrete event simulator system, [7] Project Akaroa, [8] R. Ramaswami, K.N. Sivarajan, Design of logical topologies for wavelength-routed optical networks, IEEE Journal on Selected Areas in Communications, vol. 4, no. 5 pp , June 996. [9] A. Mokhtar, M. Azizoglu, Adaptative wavelength routing in all-optical networks, IEEE/ACM Transactions on Networking, vol. 6, no. 2, pp , April 998. [0] R. Johnsonbaugh, M. Schaefer, Algorithms, Pearson Education, Inc., pp , 2004.

Dynamic Establishment of All-Optical Connections in Wavelength-Routed Optical Networks Using Genetic Algorithms

Dynamic Establishment of All-Optical Connections in Wavelength-Routed Optical Networks Using Genetic Algorithms D. Bisbal, F. González, I. de Miguel, J. Blas, J. C. Aguado, P. Fernández, R. M. Lorenzo, E. J. Abril, M. López, Dynamic establishment of alloptical connections in wavelength-routed optical networks using

More information

PART III. OPS-based wide area networks

PART III. OPS-based wide area networks PART III OPS-based wide area networks Chapter 7 Introduction to the OPS-based wide area network 7.1 State-of-the-art In this thesis, we consider the general switch architecture with full connectivity

More information

Dynamic Congestion-Based Load Balanced Routing in Optical Burst-Switched Networks

Dynamic Congestion-Based Load Balanced Routing in Optical Burst-Switched Networks Dynamic Congestion-Based Load Balanced Routing in Optical Burst-Switched Networks Guru P.V. Thodime, Vinod M. Vokkarane, and Jason P. Jue The University of Texas at Dallas, Richardson, TX 75083-0688 vgt015000,

More information

ASON for Optical Networks

ASON for Optical Networks 1/287 01-FGC1010609 Rev B ASON for Optical Networks Ericsson Control Plane for DWDM Optically Switched Networks ASON for MHL3000 Introduction The growing demand for multiple service is changing the network

More information

A Software Architecture for a Photonic Network Planning Tool

A Software Architecture for a Photonic Network Planning Tool A Software Architecture for a Photonic Network Planning Tool Volker Feil, Jan Späth University of Stuttgart, Institute of Communication Networks and Computer Engineering Pfaffenwaldring 47, D-70569 Stuttgart

More information

subject to x dp = 1.0, d D (2a)

subject to x dp = 1.0, d D (2a) Lightpath Topology Configuration for Wavelength-routed IP/MPLS Networks for Time-Dependent Traffic Gaurav Agrawal, Deep Medhi Computer Science & Electrical Engineering Department University of Missouri

More information

Optical Network Traffic Control Algorithm under Variable Loop Delay: A Simulation Approach

Optical Network Traffic Control Algorithm under Variable Loop Delay: A Simulation Approach Int. J. Communications, Network and System Sciences, 2009, 7, 652-656 doi:10.4236/icns.2009.27074 Published Online October 2009 (http://www.scirp.org/ournal/icns/). Optical Network Traffic Control Algorithm

More information

Module 5. Broadcast Communication Networks. Version 2 CSE IIT, Kharagpur

Module 5. Broadcast Communication Networks. Version 2 CSE IIT, Kharagpur Module 5 Broadcast Communication Networks Lesson 1 Network Topology Specific Instructional Objectives At the end of this lesson, the students will be able to: Specify what is meant by network topology

More information

CHAPTER 2. QoS ROUTING AND ITS ROLE IN QOS PARADIGM

CHAPTER 2. QoS ROUTING AND ITS ROLE IN QOS PARADIGM CHAPTER 2 QoS ROUTING AND ITS ROLE IN QOS PARADIGM 22 QoS ROUTING AND ITS ROLE IN QOS PARADIGM 2.1 INTRODUCTION As the main emphasis of the present research work is on achieving QoS in routing, hence this

More information

Policy-Based Fault Management for Integrating IP over Optical Networks

Policy-Based Fault Management for Integrating IP over Optical Networks Policy-Based Fault Management for Integrating IP over Optical Networks Cláudio Carvalho 1, Edmundo Madeira 1, Fábio Verdi 2, and Maurício Magalhães 2 1 Institute of Computing (IC-UNICAMP) 13084-971 Campinas,

More information

Performance of networks containing both MaxNet and SumNet links

Performance of networks containing both MaxNet and SumNet links Performance of networks containing both MaxNet and SumNet links Lachlan L. H. Andrew and Bartek P. Wydrowski Abstract Both MaxNet and SumNet are distributed congestion control architectures suitable for

More information

A Power Efficient QoS Provisioning Architecture for Wireless Ad Hoc Networks

A Power Efficient QoS Provisioning Architecture for Wireless Ad Hoc Networks A Power Efficient QoS Provisioning Architecture for Wireless Ad Hoc Networks Didem Gozupek 1,Symeon Papavassiliou 2, Nirwan Ansari 1, and Jie Yang 1 1 Department of Electrical and Computer Engineering

More information

Router Scheduling Configuration Based on the Maximization of Benefit and Carried Best Effort Traffic

Router Scheduling Configuration Based on the Maximization of Benefit and Carried Best Effort Traffic Telecommunication Systems 24:2 4, 275 292, 2003 2003 Kluwer Academic Publishers. Manufactured in The Netherlands. Router Scheduling Configuration Based on the Maximization of Benefit and Carried Best Effort

More information

Scaling 10Gb/s Clustering at Wire-Speed

Scaling 10Gb/s Clustering at Wire-Speed Scaling 10Gb/s Clustering at Wire-Speed InfiniBand offers cost-effective wire-speed scaling with deterministic performance Mellanox Technologies Inc. 2900 Stender Way, Santa Clara, CA 95054 Tel: 408-970-3400

More information

PART II. OPS-based metro area networks

PART II. OPS-based metro area networks PART II OPS-based metro area networks Chapter 3 Introduction to the OPS-based metro area networks Some traffic estimates for the UK network over the next few years [39] indicate that when access is primarily

More information

Introduction to Optical Networks

Introduction to Optical Networks Yatindra Nath Singh Assistant Professor Electrical Engineering Department Indian Institute of Technology, Kanpur Email: ynsingh@ieee.org http://home.iitk.ac.in/~ynsingh 1 What are optical network? Telecomm

More information

Hyper Node Torus: A New Interconnection Network for High Speed Packet Processors

Hyper Node Torus: A New Interconnection Network for High Speed Packet Processors 2011 International Symposium on Computer Networks and Distributed Systems (CNDS), February 23-24, 2011 Hyper Node Torus: A New Interconnection Network for High Speed Packet Processors Atefeh Khosravi,

More information

Determine: route for each connection and protect them if necessary to minimize total network cost (say wavelength-links).

Determine: route for each connection and protect them if necessary to minimize total network cost (say wavelength-links). Service Provisioning to Provide Per-Connection-Based Availability Guarantee in WDM Mesh Networks Jing Zhang, Keyao Zhu, Hui Zang, and Biswanath Mukherjee Abstract We present availability analysis for WDM-mesh-network

More information

Rollout Algorithms for Topology Control and Routing of Unsplittable Flows in Wireless Optical Backbone Networks*

Rollout Algorithms for Topology Control and Routing of Unsplittable Flows in Wireless Optical Backbone Networks* Rollout Algorithms for Topology Control and Routing of Unsplittable Flows in Wireless Optical Backbone Networks* Abhishek Kashyap, Mehdi Kalantari, Kwangil Lee and Mark Shayman Department of Electrical

More information

TCP and UDP Performance for Internet over Optical Packet-Switched Networks

TCP and UDP Performance for Internet over Optical Packet-Switched Networks TCP and UDP Performance for Internet over Optical Packet-Switched Networks Jingyi He S-H Gary Chan Department of Electrical and Electronic Engineering Department of Computer Science Hong Kong University

More information

Preserving Message Integrity in Dynamic Process Migration

Preserving Message Integrity in Dynamic Process Migration Preserving Message Integrity in Dynamic Process Migration E. Heymann, F. Tinetti, E. Luque Universidad Autónoma de Barcelona Departamento de Informática 8193 - Bellaterra, Barcelona, Spain e-mail: e.heymann@cc.uab.es

More information

IP Traffic Engineering over OMP technique

IP Traffic Engineering over OMP technique IP Traffic Engineering over OMP technique 1 Károly Farkas, 1 Zoltán Balogh, 2 Henrik Villför 1 High Speed Networks Laboratory Department of Telecommunications and Telematics Technical University of Budapest,

More information

Capacity planning and.

Capacity planning and. Some economical principles Hints on capacity planning (and other approaches) Andrea Bianco Telecommunication Network Group firstname.lastname@polito.it http://www.telematica.polito.it/ Assume users have

More information

Provisioning algorithm for minimum throughput assurance service in VPNs using nonlinear programming

Provisioning algorithm for minimum throughput assurance service in VPNs using nonlinear programming Provisioning algorithm for minimum throughput assurance service in VPNs using nonlinear programming Masayoshi Shimamura (masayo-s@isnaistjp) Guraduate School of Information Science, Nara Institute of Science

More information

Design and Verification of Nine port Network Router

Design and Verification of Nine port Network Router Design and Verification of Nine port Network Router G. Sri Lakshmi 1, A Ganga Mani 2 1 Assistant Professor, Department of Electronics and Communication Engineering, Pragathi Engineering College, Andhra

More information

Three Key Design Considerations of IP Video Surveillance Systems

Three Key Design Considerations of IP Video Surveillance Systems Three Key Design Considerations of IP Video Surveillance Systems 2012 Moxa Inc. All rights reserved. Three Key Design Considerations of IP Video Surveillance Systems Copyright Notice 2012 Moxa Inc. All

More information

WDM Passive Optical Networks: Protection and Restoration

WDM Passive Optical Networks: Protection and Restoration OECC 2009 Workshop: Next-generation Broadband Optical Access Future Challenges Session 1: Broadband Network Architectures, WDM PON Evolution Strategies and Future Ultra-high- bandwidth Services WDM Passive

More information

MULTISTAGE INTERCONNECTION NETWORKS: A TRANSITION TO OPTICAL

MULTISTAGE INTERCONNECTION NETWORKS: A TRANSITION TO OPTICAL MULTISTAGE INTERCONNECTION NETWORKS: A TRANSITION TO OPTICAL Sandeep Kumar 1, Arpit Kumar 2 1 Sekhawati Engg. College, Dundlod, Dist. - Jhunjhunu (Raj.), 1987san@gmail.com, 2 KIIT, Gurgaon (HR.), Abstract

More information

Algorithms for Interference Sensing in Optical CDMA Networks

Algorithms for Interference Sensing in Optical CDMA Networks Algorithms for Interference Sensing in Optical CDMA Networks Purushotham Kamath, Joseph D. Touch and Joseph A. Bannister {pkamath, touch, joseph}@isi.edu Information Sciences Institute, University of Southern

More information

All-optical fiber-optics networks

All-optical fiber-optics networks All-optical fiber-optics networks A passive star based local optical WDM network Unicast Multicast Workstation Passive star coupler (c) Sergiusz Patela 2001 All-optical networks 2 A wavelength routed wide-area

More information

The Economics of Cisco s nlight Multilayer Control Plane Architecture

The Economics of Cisco s nlight Multilayer Control Plane Architecture The Economics of Cisco s nlight Multilayer Control Plane Architecture Executive Summary Networks are becoming more difficult to plan and optimize because of high traffic growth, volatile traffic patterns,

More information

NOVEL PRIORITISED EGPRS MEDIUM ACCESS REGIME FOR REDUCED FILE TRANSFER DELAY DURING CONGESTED PERIODS

NOVEL PRIORITISED EGPRS MEDIUM ACCESS REGIME FOR REDUCED FILE TRANSFER DELAY DURING CONGESTED PERIODS NOVEL PRIORITISED EGPRS MEDIUM ACCESS REGIME FOR REDUCED FILE TRANSFER DELAY DURING CONGESTED PERIODS D. Todinca, P. Perry and J. Murphy Dublin City University, Ireland ABSTRACT The goal of this paper

More information

Internet Protocol version 4 Part I

Internet Protocol version 4 Part I Internet Protocol version 4 Part I Claudio Cicconetti International Master on Information Technology International Master on Communication Networks Engineering Table of Contents

More information

Data Center Network Structure using Hybrid Optoelectronic Routers

Data Center Network Structure using Hybrid Optoelectronic Routers Data Center Network Structure using Hybrid Optoelectronic Routers Yuichi Ohsita, and Masayuki Murata Graduate School of Information Science and Technology, Osaka University Osaka, Japan {y-ohsita, murata}@ist.osaka-u.ac.jp

More information

A Dynamic Link Allocation Router

A Dynamic Link Allocation Router A Dynamic Link Allocation Router Wei Song and Doug Edwards School of Computer Science, the University of Manchester Oxford Road, Manchester M13 9PL, UK {songw, doug}@cs.man.ac.uk Abstract The connection

More information

Overview of Network Hardware and Software. CS158a Chris Pollett Jan 29, 2007.

Overview of Network Hardware and Software. CS158a Chris Pollett Jan 29, 2007. Overview of Network Hardware and Software CS158a Chris Pollett Jan 29, 2007. Outline Scales of Networks Protocol Hierarchies Scales of Networks Last day, we talked about broadcast versus point-to-point

More information

Design of Light-Tree Based Optical Inter-Datacenter Networks

Design of Light-Tree Based Optical Inter-Datacenter Networks Lin et al. VOL. 5, NO. 12/DECEMBER 2013/J. OPT. COMMUN. NETW. 1443 Design of Light-Tree Based Optical Inter-Datacenter Networks Rongping Lin, Moshe Zukerman, Gangxiang Shen, and Wen-De Zhong Abstract Nowadays,

More information

Wide Area Networks. Learning Objectives. LAN and WAN. School of Business Eastern Illinois University. (Week 11, Thursday 3/22/2007)

Wide Area Networks. Learning Objectives. LAN and WAN. School of Business Eastern Illinois University. (Week 11, Thursday 3/22/2007) School of Business Eastern Illinois University Wide Area Networks (Week 11, Thursday 3/22/2007) Abdou Illia, Spring 2007 Learning Objectives 2 Distinguish between LAN and WAN Distinguish between Circuit

More information

Broadband Networks. Prof. Karandikar. Department of Electrical Engineering. Indian Institute of Technology, Bombay. Lecture - 26

Broadband Networks. Prof. Karandikar. Department of Electrical Engineering. Indian Institute of Technology, Bombay. Lecture - 26 Broadband Networks Prof. Karandikar Department of Electrical Engineering Indian Institute of Technology, Bombay Lecture - 26 Optical Network &MPLS So, as you were discussing in the previous lectures, next

More information

A New Fault Tolerant Routing Algorithm For GMPLS/MPLS Networks

A New Fault Tolerant Routing Algorithm For GMPLS/MPLS Networks A New Fault Tolerant Routing Algorithm For GMPLS/MPLS Networks Mohammad HossienYaghmae Computer Department, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran hyaghmae@ferdowsi.um.ac.ir

More information

Internet of Things. Exam June 24

Internet of Things. Exam June 24 Internet of Things Exam June 24 Exercise 1 A personal area network (PAN) is composed of 100 motes and a PAN Coordinator. The PAN works in beacon- enabled mode. 50 motes of Type 1 are equipped with light

More information

The Analysis and Simulation of VoIP

The Analysis and Simulation of VoIP ENSC 427 Communication Networks Spring 2013 Final Project The Analysis and Simulation of VoIP http://www.sfu.ca/~cjw11/427project.html Group #3 Demet Dilekci ddilekci@sfu.ca Conrad Wang cw11@sfu.ca Jiang

More information

Dynamic Load Balancing in WDM Packet Networks With and Without Wavelength Constraints

Dynamic Load Balancing in WDM Packet Networks With and Without Wavelength Constraints 1972 IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS, VOL. 18, NO. 10, OCTOBER 2000 Dynamic Load Balancing in WDM Packet Networks With and Without Wavelength Constraints Aradhana Narula-Tam and Eytan

More information

Introduction to Ethernet

Introduction to Ethernet Technical Tutorial 2002 12-06 Table of Contents 1: Introduction 2: Ethernet 3: IEEE standards 4: Topology 5: CSMA/CD 6: Wireless-LAN 7: Transmission Speed 8: Limitations of Ethernet 9: Sena Products and

More information

Architecture of distributed network processors: specifics of application in information security systems

Architecture of distributed network processors: specifics of application in information security systems Architecture of distributed network processors: specifics of application in information security systems V.Zaborovsky, Politechnical University, Sait-Petersburg, Russia vlad@neva.ru 1. Introduction Modern

More information

Facility Usage Scenarios

Facility Usage Scenarios Facility Usage Scenarios GDD-06-41 GENI: Global Environment for Network Innovations December 22, 2006 Status: Draft (Version 0.1) Note to the reader: this document is a work in progress and continues to

More information

Ethernet. Ethernet Frame Structure. Ethernet Frame Structure (more) Ethernet: uses CSMA/CD

Ethernet. Ethernet Frame Structure. Ethernet Frame Structure (more) Ethernet: uses CSMA/CD Ethernet dominant LAN technology: cheap -- $20 for 100Mbs! first widely used LAN technology Simpler, cheaper than token rings and ATM Kept up with speed race: 10, 100, 1000 Mbps Metcalfe s Etheret sketch

More information

What Applications Can be Deployed with Software Defined Elastic Optical Networks?

What Applications Can be Deployed with Software Defined Elastic Optical Networks? What Applications Can be Deployed with Software Defined Elastic Optical Networks? Yongli Zhao State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications

More information

Smart Queue Scheduling for QoS Spring 2001 Final Report

Smart Queue Scheduling for QoS Spring 2001 Final Report ENSC 833-3: NETWORK PROTOCOLS AND PERFORMANCE CMPT 885-3: SPECIAL TOPICS: HIGH-PERFORMANCE NETWORKS Smart Queue Scheduling for QoS Spring 2001 Final Report By Haijing Fang(hfanga@sfu.ca) & Liu Tang(llt@sfu.ca)

More information

Network Basics GRAPHISOFT. for connecting to a BIM Server. 2009 (version 1.0)

Network Basics GRAPHISOFT. for connecting to a BIM Server. 2009 (version 1.0) for connecting to a BIM Server GRAPHISOFT 2009 (version 1.0) Basic Vocabulary...3 Local Area Networks...5 Examples of Local Area Networks...5 Example 1: LAN of two computers without any other network devices...5

More information

Partial Path Protection for WDM Networks: End-to-End Recovery Using Local Failure Information

Partial Path Protection for WDM Networks: End-to-End Recovery Using Local Failure Information 1 Partial Path Protection for WDM Networks: End-to-End Recovery Using Local Failure Information Hungjen Wang, Eytan Modiano, Muriel Médard Abstract Path protection and link protection schemes are the main

More information

MPLS. Packet switching vs. circuit switching Virtual circuits

MPLS. Packet switching vs. circuit switching Virtual circuits MPLS Circuit switching Packet switching vs. circuit switching Virtual circuits MPLS Labels and label-switching Forwarding Equivalence Classes Label distribution MPLS applications Packet switching vs. circuit

More information

Data Communication and Computer Network

Data Communication and Computer Network 1 Data communication principles, types and working principles of modems, Network principles, OSI model, functions of data link layer and network layer, networking components, communication protocols- X

More information

Behavior Analysis of TCP Traffic in Mobile Ad Hoc Network using Reactive Routing Protocols

Behavior Analysis of TCP Traffic in Mobile Ad Hoc Network using Reactive Routing Protocols Behavior Analysis of TCP Traffic in Mobile Ad Hoc Network using Reactive Routing Protocols Purvi N. Ramanuj Department of Computer Engineering L.D. College of Engineering Ahmedabad Hiteishi M. Diwanji

More information

An Adaptive Load Balancing to Provide Quality of Service

An Adaptive Load Balancing to Provide Quality of Service An Adaptive Load Balancing to Provide Quality of Service 1 Zahra Vali, 2 Massoud Reza Hashemi, 3 Neda Moghim *1, Isfahan University of Technology, Isfahan, Iran 2, Isfahan University of Technology, Isfahan,

More information

Protagonist International Journal of Management And Technology (PIJMT) Online ISSN- 2394-3742. Vol 2 No 3 (May-2015) Active Queue Management

Protagonist International Journal of Management And Technology (PIJMT) Online ISSN- 2394-3742. Vol 2 No 3 (May-2015) Active Queue Management Protagonist International Journal of Management And Technology (PIJMT) Online ISSN- 2394-3742 Vol 2 No 3 (May-2015) Active Queue Management For Transmission Congestion control Manu Yadav M.Tech Student

More information

ANALYSIS OF LONG DISTANCE 3-WAY CONFERENCE CALLING WITH VOIP

ANALYSIS OF LONG DISTANCE 3-WAY CONFERENCE CALLING WITH VOIP ENSC 427: Communication Networks ANALYSIS OF LONG DISTANCE 3-WAY CONFERENCE CALLING WITH VOIP Spring 2010 Final Project Group #6: Gurpal Singh Sandhu Sasan Naderi Claret Ramos (gss7@sfu.ca) (sna14@sfu.ca)

More information

LOAD BALANCING IN WDM NETWORKS THROUGH DYNAMIC ROUTE CHANGES

LOAD BALANCING IN WDM NETWORKS THROUGH DYNAMIC ROUTE CHANGES LOAD BALANCING IN WDM NETWORKS THROUGH DYNAMIC ROUTE CHANGES S.Ramanathan 1, G.Karthik 1, Ms.G.Sumathi 2 1 Dept. of computer science Sri Venkateswara College of engineering, Sriperumbudur, 602 105. 2 Asst.professor,

More information

Communication Networks. MAP-TELE 2011/12 José Ruela

Communication Networks. MAP-TELE 2011/12 José Ruela Communication Networks MAP-TELE 2011/12 José Ruela Network basic mechanisms Introduction to Communications Networks Communications networks Communications networks are used to transport information (data)

More information

VoIP Network Dimensioning using Delay and Loss Bounds for Voice and Data Applications

VoIP Network Dimensioning using Delay and Loss Bounds for Voice and Data Applications VoIP Network Dimensioning using Delay and Loss Bounds for Voice and Data Applications Veselin Rakocevic School of Engineering and Mathematical Sciences City University, London, UK V.Rakocevic@city.ac.uk

More information

Multicast Routing in Hierarchical Optical Networks Using Collection-Distribution Networks (An Invited Paper)

Multicast Routing in Hierarchical Optical Networks Using Collection-Distribution Networks (An Invited Paper) Multicast Routing in Hierarchical Optical Networks Using Collection-Distribution Networks (An Invited Paper) Onur Turkcu 1, Suresh Subramaniam 2, and Arun K. Somani 1 1 Department of Electrical and Computer

More information

CS 5480/6480: Computer Networks Spring 2012 Homework 4 Solutions Due by 1:25 PM on April 11 th 2012

CS 5480/6480: Computer Networks Spring 2012 Homework 4 Solutions Due by 1:25 PM on April 11 th 2012 CS 5480/6480: Computer Networks Spring 2012 Homework 4 Solutions Due by 1:25 PM on April 11 th 2012 Important: The solutions to the homework problems from the course book have been provided by the authors.

More information

Analog vs. Digital Transmission

Analog vs. Digital Transmission Analog vs. Digital Transmission Compare at two levels: 1. Data continuous (audio) vs. discrete (text) 2. Signaling continuously varying electromagnetic wave vs. sequence of voltage pulses. Also Transmission

More information

Introduction to Add-Drop Multiplexers

Introduction to Add-Drop Multiplexers 3 Introduction to Add-Drop Multiplexers In this chapter different channel routing technologies are reviewed, highlighting the advantages and drawbacks of the different devices and configurations. The parameters

More information

Maximizing the number of users in an interactive video-ondemand. Citation Ieee Transactions On Broadcasting, 2002, v. 48 n. 4, p.

Maximizing the number of users in an interactive video-ondemand. Citation Ieee Transactions On Broadcasting, 2002, v. 48 n. 4, p. Title Maximizing the number of users in an interactive video-ondemand system Author(s) Bakiras, S; Li, VOK Citation Ieee Transactions On Broadcasting, 2002, v. 48 n. 4, p. 281-292 Issued Date 2002 URL

More information

Computer Networks. By Hardeep Singh

Computer Networks. By Hardeep Singh Computer Networks Contents Introduction Basic Elements of communication systemnetwork Topologies Network types Introduction A Computer network is a network of computers that are geographically distributed,

More information

Assignment #3 Routing and Network Analysis. CIS3210 Computer Networks. University of Guelph

Assignment #3 Routing and Network Analysis. CIS3210 Computer Networks. University of Guelph Assignment #3 Routing and Network Analysis CIS3210 Computer Networks University of Guelph Part I Written (50%): 1. Given the network graph diagram above where the nodes represent routers and the weights

More information

Quality of Service using Traffic Engineering over MPLS: An Analysis. Praveen Bhaniramka, Wei Sun, Raj Jain

Quality of Service using Traffic Engineering over MPLS: An Analysis. Praveen Bhaniramka, Wei Sun, Raj Jain Praveen Bhaniramka, Wei Sun, Raj Jain Department of Computer and Information Science The Ohio State University 201 Neil Ave, DL39 Columbus, OH 43210 USA Telephone Number: +1 614-292-3989 FAX number: +1

More information

Line Monitoring and Control in Subsea Networks

Line Monitoring and Control in Subsea Networks Line Monitoring and Control in Subsea Networks This paper discusses how submerged equipment is monitored and contrasts different methods of doing this. It also considers what features are required by the

More information

A Quality of Service Scheduling Technique for Optical LANs

A Quality of Service Scheduling Technique for Optical LANs A Quality of Service Scheduling Technique for Optical LANs Panagiotis G. Sarigiannidis, Member, IEEE, Sophia G. Petridou, Member, IEEE, Georgios I. Papadimitriou, Senior Member, IEEE Department of Informatics

More information

Computer Networks Vs. Distributed Systems

Computer Networks Vs. Distributed Systems Computer Networks Vs. Distributed Systems Computer Networks: A computer network is an interconnected collection of autonomous computers able to exchange information. A computer network usually require

More information

SHIV SHAKTI International Journal of in Multidisciplinary and Academic Research (SSIJMAR) Vol. 4, No. 3, June 2015 (ISSN 2278 5973)

SHIV SHAKTI International Journal of in Multidisciplinary and Academic Research (SSIJMAR) Vol. 4, No. 3, June 2015 (ISSN 2278 5973) SHIV SHAKTI International Journal of in Multidisciplinary and Academic Research (SSIJMAR) Vol. 4, No. 3, June 2015 (ISSN 2278 5973) RED Routing Algorithm in Active Queue Management for Transmission Congesstion

More information

Attenuation (amplitude of the wave loses strength thereby the signal power) Refraction Reflection Shadowing Scattering Diffraction

Attenuation (amplitude of the wave loses strength thereby the signal power) Refraction Reflection Shadowing Scattering Diffraction Wireless Physical Layer Q1. Is it possible to transmit a digital signal, e.g., coded as square wave as used inside a computer, using radio transmission without any loss? Why? It is not possible to transmit

More information

MAXIMIZING RESTORABLE THROUGHPUT IN MPLS NETWORKS

MAXIMIZING RESTORABLE THROUGHPUT IN MPLS NETWORKS MAXIMIZING RESTORABLE THROUGHPUT IN MPLS NETWORKS 1 M.LAKSHMI, 2 N.LAKSHMI 1 Assitant Professor, Dept.of.Computer science, MCC college.pattukottai. 2 Research Scholar, Dept.of.Computer science, MCC college.pattukottai.

More information

Distributed Explicit Partial Rerouting (DEPR) Scheme for Load Balancing in MPLS Networks

Distributed Explicit Partial Rerouting (DEPR) Scheme for Load Balancing in MPLS Networks Distributed Eplicit Partial Rerouting (DEPR) Scheme for Load Balancing in MPLS Networks Sherif Ibrahim Mohamed shf_ibrahim@yahoo.com Khaled M. F. Elsayed, senior member IEEE khaled@ieee.org Department

More information

Optical Packet Buffers with Active Queue Management

Optical Packet Buffers with Active Queue Management Optical Packet Buffers with Active Queue Management Assaf Shacham and Keren Bergman Columbia University, Department of Electrical Engineering, New York, NY 10027 bergman@ee.columbia.edu, http://lightwave.ee.columbia.edu

More information

Local Area Networks transmission system private speedy and secure kilometres shared transmission medium hardware & software

Local Area Networks transmission system private speedy and secure kilometres shared transmission medium hardware & software Local Area What s a LAN? A transmission system, usually private owned, very speedy and secure, covering a geographical area in the range of kilometres, comprising a shared transmission medium and a set

More information

Routing in packet-switching networks

Routing in packet-switching networks Routing in packet-switching networks Circuit switching vs. Packet switching Most of WANs based on circuit or packet switching Circuit switching designed for voice Resources dedicated to a particular call

More information

Current Trends of Topology Discovery in OpenFlow-based Software Defined Networks

Current Trends of Topology Discovery in OpenFlow-based Software Defined Networks 1 Current Trends of Topology Discovery in OpenFlow-based Software Defined Networks Leonardo Ochoa-Aday, Cristina Cervello -Pastor, Member, IEEE, and Adriana Ferna ndez-ferna ndez Abstract The explosion

More information

Computer Networks. Definition of LAN. Connection of Network. Key Points of LAN. Lecture 06 Connecting Networks

Computer Networks. Definition of LAN. Connection of Network. Key Points of LAN. Lecture 06 Connecting Networks Computer Networks Lecture 06 Connecting Networks Kuang-hua Chen Department of Library and Information Science National Taiwan University Local Area Networks (LAN) 5 kilometer IEEE 802.3 Ethernet IEEE 802.4

More information

G.Vijaya kumar et al, Int. J. Comp. Tech. Appl., Vol 2 (5), 1413-1418

G.Vijaya kumar et al, Int. J. Comp. Tech. Appl., Vol 2 (5), 1413-1418 An Analytical Model to evaluate the Approaches of Mobility Management 1 G.Vijaya Kumar, *2 A.Lakshman Rao *1 M.Tech (CSE Student), Pragati Engineering College, Kakinada, India. Vijay9908914010@gmail.com

More information

Single-Link Failure Detection in All-Optical Networks Using Monitoring Cycles and Paths

Single-Link Failure Detection in All-Optical Networks Using Monitoring Cycles and Paths Single-Link Failure Detection in All-Optical Networks Using Monitoring Cycles and Paths Satyajeet S. Ahuja, Srinivasan Ramasubramanian, and Marwan Krunz Department of ECE, University of Arizona, Tucson,

More information

공유형 혹은 아웃풋 광 지연 선로 버퍼를 갖는 비동기 광패킷 스위칭 시스템 설계를 위해 필요한 가변 파장 변환기 및 내부 파장 개수의 도출

공유형 혹은 아웃풋 광 지연 선로 버퍼를 갖는 비동기 광패킷 스위칭 시스템 설계를 위해 필요한 가변 파장 변환기 및 내부 파장 개수의 도출 논문 14-39B-02-04 한국통신학회논문지(J-KICS) '14-02 Vol.39B No.02 http://dx.doi.org/10.7840/kics.2014.39b.2.86 공유형 혹은 아웃풋 광 지연 선로 버퍼를 갖는 비동기 광패킷 스위칭 시스템 설계를 위해 필요한 가변 파장 변환기 및 내부 파장 개수의 도출 임 헌 국 Deduction of TWCs

More information

! # % & (!) ( ( # +,% ( +& (. / + 0 + 10 %. 1. 0(2131( 12. 4 56 6!, 4 56 / + & 71 0 8

! # % & (!) ( ( # +,% ( +& (. / + 0 + 10 %. 1. 0(2131( 12. 4 56 6!, 4 56 / + & 71 0 8 ! # % & (!) ( ( # +,% ( +& (. / + 0 + 10 %. 1. 0(2131( 12. 4 56 6!, 4 56 / + & 71 0 8 9 Energy Efficient Tapered Data Networks for Big Data Processing in IP/WDM Networks Ali M. Al-Salim, Ahmed Q. Lawey,

More information

Efficient and low cost Internet backup to Primary Video lines

Efficient and low cost Internet backup to Primary Video lines Efficient and low cost Internet backup to Primary Video lines By Adi Rozenberg, CTO Table of Contents Chapter 1. Introduction... 1 Chapter 2. The DVP100 solution... 2 Chapter 3. VideoFlow 3V Technology...

More information

WHITE PAPER. IP-based Networks: Axis White Paper, 2002-1 - Copyright 2002, Axis Communications www.axis.com

WHITE PAPER. IP-based Networks: Axis White Paper, 2002-1 - Copyright 2002, Axis Communications www.axis.com WHITE PAPER IP-based Networks: Basics Axis White Paper, 2002-1 - Copyright 2002, Axis Communications TABLE OF CONTENTS 1. INTRODUCTION... 3 2. BASICS IN NETWORK COMMUNICATION... 3 3. TRANSMISSION FUNDAMENTALS...

More information

RESOURCE ALLOCATION FOR INTERACTIVE TRAFFIC CLASS OVER GPRS

RESOURCE ALLOCATION FOR INTERACTIVE TRAFFIC CLASS OVER GPRS RESOURCE ALLOCATION FOR INTERACTIVE TRAFFIC CLASS OVER GPRS Edward Nowicki and John Murphy 1 ABSTRACT The General Packet Radio Service (GPRS) is a new bearer service for GSM that greatly simplify wireless

More information

SDH and WDM: a look at the physical layer

SDH and WDM: a look at the physical layer SDH and WDM: a look at the physical SDH and WDM A look at the physical Andrea Bianco Telecommunication Network Group firstname.lastname@polito.it http://www.telematica.polito.it/ Network management and

More information

Analysis of IP Network for different Quality of Service

Analysis of IP Network for different Quality of Service 2009 International Symposium on Computing, Communication, and Control (ISCCC 2009) Proc.of CSIT vol.1 (2011) (2011) IACSIT Press, Singapore Analysis of IP Network for different Quality of Service Ajith

More information

Network Virtualization Server for Adaptive Network Control

Network Virtualization Server for Adaptive Network Control Network Virtualization Server for Adaptive Network Control Takashi Miyamura,YuichiOhsita, Shin ichi Arakawa,YukiKoizumi, Akeo Masuda, Kohei Shiomoto and Masayuki Murata NTT Network Service Systems Laboratories,

More information

Performance Analysis of Optical Burst Switching High- Speed Network Architecture

Performance Analysis of Optical Burst Switching High- Speed Network Architecture 292 IJCSNS International Journal of Computer Science and Network Security, VOL.7 No.4, April 2007 Performance Analysis of Optical Burst Switching High- Speed Network Architecture Amit Kumar Garg and R

More information

Expert Reference Series of White Papers. Basics of IP Address Subnetting

Expert Reference Series of White Papers. Basics of IP Address Subnetting Expert Reference Series of White Papers Basics of IP Address Subnetting 1-800-COURSES www.globalknowledge.com Basics of IP Address Subnetting Norbert Gregorio, Global Knowledge Instructor Introduction

More information

A Slow-sTart Exponential and Linear Algorithm for Energy Saving in Wireless Networks

A Slow-sTart Exponential and Linear Algorithm for Energy Saving in Wireless Networks 1 A Slow-sTart Exponential and Linear Algorithm for Energy Saving in Wireless Networks Yang Song, Bogdan Ciubotaru, Member, IEEE, and Gabriel-Miro Muntean, Member, IEEE Abstract Limited battery capacity

More information

Efficient DNS based Load Balancing for Bursty Web Application Traffic

Efficient DNS based Load Balancing for Bursty Web Application Traffic ISSN Volume 1, No.1, September October 2012 International Journal of Science the and Internet. Applied However, Information this trend leads Technology to sudden burst of Available Online at http://warse.org/pdfs/ijmcis01112012.pdf

More information

Optical interconnection networks for data centers

Optical interconnection networks for data centers Optical interconnection networks for data centers The 17th International Conference on Optical Network Design and Modeling Brest, France, April 2013 Christoforos Kachris and Ioannis Tomkos Athens Information

More information

A Comparison Study of Qos Using Different Routing Algorithms In Mobile Ad Hoc Networks

A Comparison Study of Qos Using Different Routing Algorithms In Mobile Ad Hoc Networks A Comparison Study of Qos Using Different Routing Algorithms In Mobile Ad Hoc Networks T.Chandrasekhar 1, J.S.Chakravarthi 2, K.Sravya 3 Professor, Dept. of Electronics and Communication Engg., GIET Engg.

More information

SDH and WDM A look at the physical layer

SDH and WDM A look at the physical layer SDH and WDM A look at the physical Andrea Bianco Telecommunication Network Group firstname.lastname@polito.it http://www.telematica.polito.it/ Network management and QoS provisioning - 1 Copyright This

More information

Using Network Activity Data to Model the Utilization of a Trunked Radio System

Using Network Activity Data to Model the Utilization of a Trunked Radio System Using Network Activity Data to Model the Utilization of a Trunked Radio System Nikola Cackov, Božidar Vujičić, Svetlana Vujičić, and Ljiljana Trajković Simon Fraser University Vancouver, Canada {ncackov,

More information

Network Architecture and Topology

Network Architecture and Topology 1. Introduction 2. Fundamentals and design principles 3. Network architecture and topology 4. Network control and signalling 5. Network components 5.1 links 5.2 switches and routers 6. End systems 7. End-to-end

More information

Hosts Address Auto Configuration for Mobile Ad Hoc Networks

Hosts Address Auto Configuration for Mobile Ad Hoc Networks Hosts Address Auto Configuration for Mobile Ad Hoc Networks Sudath Indrasinghe, Rubem Pereira, Hala Mokhtar School of Computing and Mathematical Sciences Liverpool John Moores University M.P.Indrasinghe@2004.ljmu.ac.uk,

More information