The paper discusses the shortcomings of the current day networks in transporting exponentially increasing data traffic. Bursty & unpredictable characteristics of data traffic would need thorough overhauling, of ex...
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ISBN:
(纸本)0780371011
The paper discusses the shortcomings of the current day networks in transporting exponentially increasing data traffic. Bursty & unpredictable characteristics of data traffic would need thorough overhauling, of existing networks. An allopticalnetworkarchitecture is envisaged for the future with electrical elements only in the access feeds. Various issues, techniques and architecture are discussed: The futuristic network is foreseen as: an alloptical, data centric one with mesh-ring-mesh topology, implementing QoS and distributed intelligence & management.
As the size of the Internet grows by orders of magnitude both in terms of users, number of IP addresses, and number of routers. and as the links we use (be they wired, optical or wireless) continuously evolve and prov...
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As the size of the Internet grows by orders of magnitude both in terms of users, number of IP addresses, and number of routers. and as the links we use (be they wired, optical or wireless) continuously evolve and provide varying reliability and quality of service, the IP based networkarchitecture that we know so well will have to evolve and change. Both scalability and QoS have become key issues. We are currently conducting a research project that revisits the IP routing architectureissues and proposes new designs for routers. As part of this effort, this paper discusses a packet networkarchitecture called a cognitive packet network (CPN), in which intelligent capabilities for routing and flow control are moved towards the packets. rather than being concentrated in the nodes. In this paper we outline the design of the CPN architecture. and discuss the quality-of-service based routing algorithm that we have designed and implemented. We then present our test-bed and report on extensive measurement experiments that we have conducted. (C) 2001 Elsevier Science B.V. all rights reserved.
Advances in technology have greatly increased the demand for a single integrated service network that can provide multiple service classes for different user requirements. For such a multiple-service network, congesti...
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Advances in technology have greatly increased the demand for a single integrated service network that can provide multiple service classes for different user requirements. For such a multiple-service network, congestion control is one of the key issues to be addressed. However, without an appropriate mechanism to encourage end users to use the network properly, over-utilization and congestion are unavoidable. For this problem, it is widely accepted that pricing is a proper tool to manage congestion, encourage network growth, and allocate resource to users in a fair manner. However, how to charge for the traffic and at what price is still under study. In this paper, we first briefly review the state of the art and technological growth of congestion control for integrated service networks (ISN). Subsequently, we present a summary of the recent developments on various pricing policies and different charging and billing schemes that have been proposed for ATM and Internet Differentiated Services. Some architecture and implementation issues are also discussed. Finally, some future trends are identified. (C) 2001 Elsevier Science B.V. all rights reserved.
With the advent and applications of Generalized Mufti-Protocol Label Switching (GMPLS: an optical extension to traditional Mufti-Protocol Label Switching), today's opticalnetworks evolve towards Intelligent Optic...
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ISBN:
(纸本)0819443433
With the advent and applications of Generalized Mufti-Protocol Label Switching (GMPLS: an optical extension to traditional Mufti-Protocol Label Switching), today's opticalnetworks evolve towards Intelligent opticalnetwork (ION). In this paper we firstly describes a novel IP-Centric opticalnetworkarchitecture called Hierarchical optical Routing Switching architecture (HORSA) based on GMPLS-a flexible, highly scalable IP over WDM opticalnetworkarchitecture for the delivery of public network IP services. Two kinds of node including optical Core Router (OCR) and optical Edge Router (OER) are involved in this opticalnetworkarchitecture. In this section we also discuss some issues such as routing, signaling and management of HORSA. Secondly, we mainly focus on the design issues of OCR and OER including mufti-granularity switching fabrics, intelligent OTU, control plane software and etc. Finally, we reach conclusions that HORSA based on GMPLS is suitable for current hybrid network environment and optimistic for IP traffic transfer, it can be scaled to pure optical IP over WDM architecture based on optical Packet Switch (OPS).
This paper describes the state-of-the-art technologies and issues of all-optical signal processing for implementing OTDM/WDM systems with a channel bit-rate of 160 Gbit/s.
ISBN:
(纸本)1557526540
This paper describes the state-of-the-art technologies and issues of all-optical signal processing for implementing OTDM/WDM systems with a channel bit-rate of 160 Gbit/s.
The proceedings contain 18 papers. The special focus in this conference is on opticalnetwork Design and Modeling. The topics include: Multi-granularity opticalnetworks;efficient planning tool for WDM transport netwo...
ISBN:
(纸本)9781475759983
The proceedings contain 18 papers. The special focus in this conference is on opticalnetwork Design and Modeling. The topics include: Multi-granularity opticalnetworks;efficient planning tool for WDM transport networks;all-optical signal processing devices for photonic networks;reduction of hop-count in packet-switched networks using wavelength reconfiguration;resource allocation for optical packet-switching routers with self-similar bursty traffic;a flexible WDM ring network design and dimensioning methodology;dimensioning of non-hierarchical interconnected WDM ring networks;using normalised sections for the design of allopticalnetworks;a simulation model for an optical IF router;distributed router architecture for packet-routed opticalnetworks;optical CDMA networks with bipolar codes;access control in shared access networks supporting internet diffserv and hybrid fiber radio systems.
Besides providing network management to the Internet, it has become essential to offer different Quality of Service (QoS) to users. Policy-based management provides control on network routers to achieve this goal. The...
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ISBN:
(纸本)081944247X
Besides providing network management to the Internet, it has become essential to offer different Quality of Service (QoS) to users. Policy-based management provides control on network routers to achieve this goal. The Internet Engineering Task Force (IETF) has proposed a two-tier architecture whose implementation is based on the Common Open Policy Service (COPS) protocol and Lightweight Directory Access Protocol (LDAP). However, there are several limitations to this design such as scalability and cross-vendor hardware compatibility. To address these issues, we present a functionally enhanced multi-tier policy management architecture design in this paper. Several extensions are introduced thereby adding flexibility and scalability. In particular, an intermediate entity between the policy server and policy rule database called the Policy Enforcement Agent (PEA) is introduced. By keeping internal data in a common format, using a standard protocol, and by interpreting and translating request and decision messages from multi-vendor hardware, this agent allows a dynamic Unified Information Model throughout the architecture. We have tailor-made this unique information system to save policy rules in the directory server and allow executions of policy rules with dynamic addition of new equipment during run-time.
While tunable lasers have been a focus of research and development efforts for over 10 years, they have only recently gained market acceptance in optical transport and networking. Tunable lasers offer many compelling ...
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ISBN:
(纸本)0819442569
While tunable lasers have been a focus of research and development efforts for over 10 years, they have only recently gained market acceptance in optical transport and networking. Tunable lasers offer many compelling advantages over fixed wavelength solutions in opticalnetworks in that they reduce inventories, allow dynamic wavelength provisioning, and simplify networkcontrol software. More interesting, is that tunable lasers have been featured in opticalnetwork development efforts in every segment: access/enterprise, metropolitan, and long haul networks leading to a variety of desired specifications and approaches. In fact, the term 'tunable laser' has come to describe an increasingly broad range of technologies from monolithic semiconductor lasers, to MEMS (Micro-Electro-Mechanical systems) based lasers and fiber lasers. This presentation will focus on monolithic, widely-tunable lasers which are promising candidates to satisfy the needs of all the market segments mentioned.
The rapid rise of the Internet and of data traffic in general are causing network operators to make large investments in high speed packet networks. However, in order to get a return of investments, carriers must offe...
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The rapid rise of the Internet and of data traffic in general are causing network operators to make large investments in high speed packet networks. However, in order to get a return of investments, carriers must offer not only plain bit transport, but also voice, multimedia and converged voice/data services. Therefore high performance QoS packet networks are expected to carry also an increasing share of the traffic of todays circuit switched networks. An evolutionary strategy to achieve carrier-grade services across heterogenous networks is analyzed. The networkarchitecture, protocols, characteristics of key network elements and suitable implementation concepts are discussed. It is shown how the re-use of existing callcontrol capabilities from voice switches and the proper use of commercial IT-platforms as adjuncts achieve maximum flexibility in the migration path and enable network operators to offer all desireable services.
In July 1998 NC3A was tasked by SHAPE(1) to design and implement the CIS infrastructure for a new headquarters for the Stabilization Force (SFOR) in Sarajevo. In July 2000 the system was handed over to SFOR for operat...
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ISBN:
(纸本)0780372255
In July 1998 NC3A was tasked by SHAPE(1) to design and implement the CIS infrastructure for a new headquarters for the Stabilization Force (SFOR) in Sarajevo. In July 2000 the system was handed over to SFOR for operational use. Organizationally, the project was to be a collaborative 2 effort between NC3A, SFOR and NACOSA(2), with a substantial number of short-term participants. The overall requirements called for a design that was resilient, flexible, secure, low-cost, and that satisfied minimum military requirements and used COTS equipment. Furthermore, the transition from the old site to the new site had to be accomplished with all functions of SFOR HQ fully operational. The final system was based on a camp-wide SDH ring carrying a distributed ISDN PABX network with mobile phone capabilities and an embedded unclassified Intranet. It was decided to build an SFOR Secret network for general SFOR use, and a smaller NATO Secret network for users requiring access to NATO classified data. This paper is based on the many lessons learned throughout the project. It addresses the design issues, the implementation issues and some of the over-arching organizational issues. Suggestions are made that may be of benefit for similar projects in the future.
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