Meeting the broadband access infrastructure demands: The promise of Gigabit Ethernet

Global Internet traffic growth continues to create bandwidth demand in the telecommunications network. As 100 Mb/s Ethernet and Gigabit Ethernet LANs are widely installed in enterprises, the Intranet bandwidth grows quickly. With active adoption of ADSL and cable modem broadband accesses in the SOHO and residential markets, more data traffic is generated in these markets as well. Presently, most telecom carriers use synchronous optical network/synchronous digital hierarchy (SONET/SDH) equipment to “aggregate” data traffic in the metropolitan area network (MAN) before accessing the Internet backbone network. Because of the intrinsic limitations of SONET/SDH equipment in transporting data traffic, especially in terms of bandwidth scalability and provisioning efficiency, there is a need to find a broadband access solution that can overcome the drawbacks of SONET/SDH. Because the inherent simplicity of the technology, Ethernet offers cost effectiveness, ease of networking, packet-based IP friendly protocol, and rapid provisioning advantages while competing with other networking technologies. These advantages coupled with the newly developed gigabit WAN capability have well-positioned Gigabit Ethernet as a compelling technology to break the bandwidth bottleneck in the MAN environment. In this paper, we review the enhancement of Gigabit Ethernet technology and discuss the pros and cons of using Gigabit Ethernet technology in the MAN. We also address the implications of this technology evolution on telecom carriers.     

浅析电力自动化的通信网络分析研究

通信网络是变电站自动化系统的关键。分析了变电站自动化系统中通信网的特点与要求,给出了LonWorks现场总线和嵌入式以太网两种通信方案,并对这两种方案作了分析比较。     

矿井综合自动化系统设计方案

本文对矿井综合自动化系统的设计目标、实现功能、总体架构、系统组成等作了详细介绍,为相关设计人员提供参考。     

以太网技术在配送拣货系统中的应用

主要介绍了基于以太网的远程控制系统在物流配送系统中的应用，总结了该系统的功能和特点。     

千兆以太网TAP卡的设计与实现

描述了一种千兆以太网TAP卡的设计与实现方法。该TAP卡可将千兆以太网上的数据帧复制到检测端口,并可在复制出的帧中插入精确的时间戳。使用FPGA完成数据帧的传输、复制及时间戳的插入,使用FPGA内的软CPU通过GPS接口实现精确的时间同步。掉电保护电路用于在TAP卡掉电或故障时保证被监测以太网链路的正常传输。本TAP卡可用于对软交换、3G网络等的维护和传输质量检测。     

校园主干网

本文通过四个工程实例的分析比较，旨在说明普通院校由于人力、物力、财力所限，在建设校园网时，应以交换式网为主干，其拓扑结构应采用树型或混合型，以便向未来的ＡＴＭ或千兆位网平滑的转移。     

以太网改进方案介质存取控制方式的模拟分析

本文主要介绍了三种在性能上,特别是冲突发生率较之原型以太网有很大改进的介质存取控制规程.文末提出研制避免或减少冲突的总线型网络是今后计算机网络技术发展的一个重要方面.     

教学局域网组网方案与实现

计算机网络技术已成为未来信息化社会的主流,并成为大学生知识结构中必不可少的技能。为构建适合教学规范的计算机网络教学环境,提出了利用快速以太网技术建立教学网络的组网方案和实现方法。