共查询到20条相似文献,搜索用时 15 毫秒
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Multihop networks are strong candidates for the implementation of high-speed networks, ranging from back-plane networks for cluster computing to metropolitan-area networks. Besides using deflection routing for contention resolution, optical buffering may be used to enhance the performance of optical multihop networks and to reduce or even eliminate the need for optical-electrical conversions. The enhancements obtained by augmenting traditional MSN (Manhattan Street Networks) with optical buffering are evaluated. The MSN considered here is based on a novel 6 × 6 optical switching node with up to two fiber delay loops. Impact of the parameters associated with optical buttering, such as the number of delay loops and the loop length, are discussed in detail. 相似文献
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All-optical multihop networks, where the data portion of a packet is maintained in an optically encoded format from the source to the destination, can be achieved by augmenting optical switching nodes with optical buffering. Topologically, the ShuffleNet network is a strong contender for implementing such networks ranging from cluster networks to metropolitan area networks. The performance of a regular multihop network whose nodes are augmented with optical buffering and use deflection routing is evaluated. Using the ShuffleNet network as an example, we show that performance, in terms of throughput, average delay, and loss probability, can be improved as multiple fiber delay loops are added for a large range of network parameters. We then compare the performance of ShuffleNet with the Manhattan Street networks with similar features. 相似文献
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Baert Elise Develder Chris Colle Didier Turck Filip De Pickavet Mario Demeester Piet 《Photonic Network Communications》2004,7(3):279-300
The major goal of optical packet switching (OPS) is to match switching technology to the huge capacities provided by (D)WDM. We study optical packet switches with recirculating fiber delay line (FDL) buffers. Through simulation, we have assessed the logical performance of a single optical packet router (OPR), focusing on packet loss rate (PLR). By verifying that our scheduling algorithm does not alter the traffic profile characteristics from in- to output, we illustrate how the single node results can be used to assess network-wide performance. We use the capability of assessing end-to-end PLRs to develop network-wide routing algorithms designed to minimize the maximal PLR occurring in the network. In case studies on pan-European networks, we first compare two algorithm variants and thereafter we compare the PLR-based routing algorithm with both load balancing and shortest path routing. While load balancing achieves PLRs that are multiple orders of magnitude lower than shortest path routing, the PLR-based algorithm can reach PLRs up to two orders of magnitude better. The improvement in PLR comes at the price of only a small increase in used bandwidth (a few percent). Subsequently we show that the discussed PLR-based routing algorithm can be easily extended to multiple priorities. By introducing multiple priorities we can keep the loss rates for high priority traffic very low. However, it may lead to an increase of the obtained minimal max-PLR value for low priority traffic. But as we prove this increase to be limited, the cost of introducing multiple priorities is small. 相似文献
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本文提出采用统一的马尔可夫链方法分析存储转发路由和偏射路由算法的网络,并在具体计算偏射概率时,采用了递推的算法。着重分析了偏射路由算法在无存储器、有单个存储器及有两个存储器的情况下,ManhattanStreetNetwork和ShufleNet网络的性能,包括网络吞吐量、数据包的平均跳转次数和数据包跳转次数的概率分布,并对ManhatanStreetNetwork和Shuf-fleNet两种网络进行了简单的比较。 相似文献
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研究了光突发交换(optical bursts witching,OBS)网络中的一种竞争解决策略——偏射路由并且提出了有波长变换和无波长变换的单个OBS节点的突发丢失分析的近似模型和精确模型。 相似文献
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研究了光突发交换(optical burst switching,OBS)网络中的一种竞争解决策略——偏射路(?) 并且提出了有波长变换和无波长变换的单个OBS节点的突发丢失分析的近似模型和精确模型。 相似文献
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核心网中的光分组交换 总被引:1,自引:0,他引:1
雷震洲 《电信工程技术与标准化》2003,(1):7-11
光分组交换(OPS)是光交换技术的长远发展目标,其研究工作在上世纪90年代取得了很大进步。本文主要介绍OPS的一些基本概念和相关使能技术的进展情况,最后对OPS的前景做一些分析。 相似文献
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自动交换光网络的体系结构 总被引:4,自引:0,他引:4
自动交换光网络的出现是传送网概念的重大历史性突破,本文首先阐述这种新传送体制的基本概念和发展,然后介绍其控制面的功能要求,信令及相关接口,选路和信令网,控制面结构,网络性能要求等总体问题的规范和考虑,最后论述IP层与光传送层的融合以及两种基本网络演进结构的特点。 相似文献
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野战分组交换网的性能分析 总被引:3,自引:2,他引:1
本文提出了一种评价野战分组交换性能的分析方法,其基本原理是根据网络的拓扑结构和每个节点产生的业务量计算出每个节点的总业务量以及每条链路上的业务流量,然后依据排队理论计算野战分组交换网的性能,本文对一种规划的栅格状网络进行了理论分析,并分别针对两种路由准则,采用递归方法推导出了评价网络性能的计算公式。 相似文献
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本文提出了一种用于快速计算野战分组交换网性能的方法。这种具有一般性的方法,适用于任意拓扑的野战分组交换网络,克服了只能计算某种规则网络性能的方法的局限性,大量的计算机仿真结果证实了这种分析方法的可行性和有效性。 相似文献
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Flow Routing and its Performance Analysis in Optical IP Networks 总被引:1,自引:0,他引:1
Optical packet-switching networks deploying buffering, wavelength conversion and multi-path routing have been extensively studied in recent years to provide high capacity transport for Internet traffic. However due to packet-based routing and switching, such a network could result in significant disorder and delay variation of packets when they are received by end users, thus increasing the burstiness of the Internet traffic and causing higher-layer protocol to malfunction. This paper addresses a novel routing and switching method for optical IP networks — flow routing, and its facilitating protocol. Flow routing deals with packet-flows to reduce flow corruption due to packet out-of-order, delay variation and packet loss, without using complicate control mechanism. Detailed performance analysis is given for output-buffered optical routers adopting flow routing. Two flow-oriented discarding techniques, i.e., flow discard (FD) and early flow discard (EFD), are discussed. Compared with optical packet-switching routers, a remarkable improvement of good-throughput is obtained in the optical flow-routers, especially under high congestion periods. We conclude that EFD behaves as a robust technique, which is more tolerant than FD to the change of traffic and transmission system factors. 相似文献
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本从通信业务发展的实际需要出发,描述了自动交换光网络(AS0N)的特点、功能及组成,并对AS0N的接口、控制协议、生存技术及演进步骤等方面进行了深入的阐述。 相似文献
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We propose an efficient optical packet addressing technique for optical packet-switched networks, where the pre-assigned RF frequency carriers are used to represent the packet addresses. It can simplify the control process of optical packet switching so that it results in reduced address processing time and smaller complexity of the packet address processor due to simple extraction of address information. We also analyze the performance of the proposed packet addressing scheme in the transmission aspect taking into account packet address wavelength beating and laser nonlinearity. 相似文献