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VLAN技术及其应用研究 总被引:4,自引:0,他引:4
马俊平 《武汉理工大学学报(交通科学与工程版)》2000,24(1):49-52
论证了VLAN技术特点和实现方式,以及基于ATM骨干的VLAN实现方式,论述了基于交换机的端口,基于第三层协议的类型、基于多址广播方式和策略分组划分的四种VLAN的常用划分方式,以及通过外部路由器、具有路由功能的交换机和建立通信连接来实现VLAN的通信技术;简述了千兆以太网中VLAN的主式和服务质量的实现方式。 相似文献
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IntroductionIt is well known thatthe PNNIsystem is a de-veloping system in the private ATM networkfield[1~ 5] .According to Ref.[6],PNNI includestwo categories of protocols,one defines for dis-tributing topology information between switchesand clusters of switches- routing protocol,and theother defines the signalling- signalling protocol,which is message flows used to establish point topoint and point to multi- point connections acrossthe ATM network.Forrealizing the PNNIroutingwith m… 相似文献
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IntroductionAsynchronousTransferModehasbeengivenconsiderableattentionasapowerwayofaccom-plishinganintegratedservicenetwork[1].InATMNetworks,informationisdividedintoshortfixed-lengthentities,calledcells,whichareprovidedwithflowidentificationlabels,and… 相似文献
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In the area of active traffic management, new technologies provide opportunities to improve the use of current infrastructure. Vehicles equipped with in-car communication systems are capable of exchanging messages with the infrastructure and other vehicles. This new capability offers many opportunities for traffic management. This paper presents a novel merging assistant strategy that exploits the communication capabilities of intelligent vehicles. The proposed control requires the cooperation of equipped vehicles on the main carriageway in order to create merging gaps for on-ramp vehicles released by a traffic light. The aim is to reduce disruptions to the traffic flow created by the merging vehicles. This paper focuses on the analytical formulation of the control algorithm, and the traffic flow theories used to define the strategy. The dynamics of the gap formation derived from theoretical considerations are validated using a microscopic simulation. The validation indicates that the control strategy mostly developed from macroscopic theory well approximates microscopic traffic behaviour. The results present encouraging capabilities of the system. The size and frequency of the gaps created on the main carriageway, and the space and time required for their creation are compatible with a real deployment of the system. Finally, we summarise the results of a previous study showing that the proposed merging strategy reduces the occurrence of congestion and the number of late-merging vehicles. This innovative control strategy shows the potential of using intelligent vehicles for facilitating the merging manoeuvre through use of emerging communications technologies. 相似文献
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基于宽带网络物理设计要求,提出了高速公路联网通信系统ATM over SDH+PON解决方案,然后对接入网与骨干网结构、容量、网管、保护和同步系统进行了设计。 相似文献
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AMT自动换档变速器在城市客车上的应用 总被引:2,自引:0,他引:2
介绍一种正在兴起的变速技术———AMT(Automated Mechanical Transmission)自动换档变速器,阐述其发展过程、工作原理、性能特点及其在城市客车上的应用前景。 相似文献
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一种新的基于神经网络学习的算法应用ATM通信网络的控制系统,该学习方法利用了误差反向传播的概念对于ATM的通信质量和业务性能大大提高。而且利用神经网络可以建立输入输出的关系,具有容易实现的特点,并给出了计算机模拟的结果。 相似文献