应用ATM网络实现电力系统远程实时监控

提出了电力系统实时决策系统中超远程强实时通信的设计与实现方法，在网络拓扑上采用星形的多智能客户机组／中央服务器群集模式；网络物理载体采用能够提供高带宽和极短时延的基于光放大技术的同步光纤网；在通信方式的选择上，采用基于无确认的方式并且能够提供良好的实时服务的兼容性的ATM技术，通过对可靠性和实时通信时延进行精确估算，表明采用此设计方式，可以满足电力系统实时决策和紧急控制对上千千米超远程通信的可靠性和实时性要求。     

同步数字体系骨干网的高集成度接入方法研究

针对解决同步数字体系（SDH）骨干网传输系统中通信节点的规模问题,提出了一种高集成度接入SDH骨干网的方法,该方法基于“单FPGA＋多个光电转换模块”结构,在单片FPGA上可以实现多达20个通道STM-16速率等级信号的无缝接入,与已有方法相比,具有集成度高、低功耗、可靠性好和功能灵活配置等优点,该方法已成功应用在某型主干网通信系统中,应用结果表明,该方法可以实现完全符合SONET/SDH标准的并-串-光的发送和光-串-并的接收功能,大大降低了通信节点的规模,具有重要的实际意义和应用价值.     

网络抗毁性

概述网络抗毁性定义、测度、抗毁技术框架和体系结构，重点结合Ｂ－ＩＳＤＮ传递网络模型，综述其各层保护技术的发展，最后介绍这些技术在网络中的综合应用，管理与评估。     

通用成帧规程GFP的原理和应用

ITU-TG.7041通用成帧规程(GFP)是一种简便的可将高层客户数据信号适配到位/字节同步物理传输信道的通用方法,它能简化传输过程的映射处理,并有效地提高传输效率。文章介绍GFP的产生背景、帧格式和通用成帧原理及其应用。     

Convergence of Protection and Restoration in Telecommunication Networks

This paper argues for the need for convergence of protection and restoration schemes in today's telecommunication networks. Such networks are presented both in a layered context and from an end-to-end perspective. Such convergence is both necessary to ensure inter-working amongst a multitude of technologies deployed and desirable to ensure simplified operations. This paper further identifies the issues and inter-working items that need resolution in today's telecommunication and data networks in order to achieve inter working amongst various existing and emerging restoration and protection schemes in a layered and end-to-end context. End-to-end context covers the access, metro, and long haul dimensions of the network. It also encompasses both the services and the transport layers of the network in the context of multi-domain, multi service provider networks. Layering issues arise from the mix of technologies at several layers for example: optical transmission and CWDM/DWDM at physical layer, SONET/SDH framing and management at layer-1, ATM, MPLS, Ethernet, and resilient packet rings at layer-2, and finally IP and routing protocols at layer-3. Given that some degree of routing and signaling intelligence is migrating down to the optical layer equipment, this whole layering concept is currently in transition. This paper shows the need for convergence in the form of a two level protection and restoration scheme. A service independent layer and a mesh restoration capability at the routing layer.     

Scalable, Hybrid Optical-RF Wireless Communication System for Broadband and Multimedia Service to Fixed and Mobile Users

This paper describes a system concept for providing, flexible high capacity multimedia communication that compliments terrestrial cellular communication systems, by supporting end-to-end broadband information services. A key element of the proposed concept is the use of optical HAP-HAP and HAP-satellite links using single color (SONET protocol based) or upon multicolor DWDM technology. The effectiveness of optical communication links is enhanced through the use of advanced optical fine pointing and tracking technology. A concept for a hybrid, optical-RF, HAP based wireless communication is presented and key technologies, capabilities and limitations are described. This revised version was published online in July 2006 with corrections to the Cover Date.     

可工作于 32～ 175Mbps的时钟和数据恢复芯片 SY87700L及其应用

SY87700L是MICREL公司推出的一种完整的、可将数据速率从32-175Mbps的NRZ数据流中进行恢复的反相不归零时钟恢复的反相不归零时钟恢复和数据重定时电路芯片,可广泛应用于SONET/SDH/ATM、高速英特网和其它所有的175Mbps以下速率结构的应用场合。文中介绍了SY87700L的主要特点、引脚功能、工作原理和应用电路。     

10Gbit／s以太网技术探析及应用前景

在城域网中,由于以太网技术更加适应业务流量急剧分组化的趋势,可以为用户提供容量、便利性以及成本方面的优势,而且随着以太网传送技术在保护恢复、服务质量保证等能力上的增强,业界开始将以太网向城域网和广域网进行扩展,而10Gbit／s以太网正是以太网突破传统局域网向城域网和广域网延伸的关键技术。     

IP流量弹性保护策略研究

典型的IP网对链路故障的反应是在故障被发现后寻找一条替换的传输路径,这样做的结果是在收敛时间内失效链路上的流量会丢失。然而,IP流量可以使用三层以下的技术来保护。本文研究了IP流量保护机制,分析了路由器的线性SDH自动保护倒换,MPLS快速变更路由,弹性分组环保护,不同的保护方法共存和过失处理机制。     

RPR:一种新兴的城域网传送技术

本文首先阐述了新一代城域网所应具备的技术要求，通过对SDH／SONET和以太网在带宽利用率、保护、多业务、QoS等方面的技术比较，指出了为优化数据传输而引入RPR技术的必要性并分析了RPR的特点以及将其融入MSTP的若干问题。