IP传送技术比较及其演进

在各种ＩＰ技术方案中,ＩＰ ｏｖｅｒ ＡＴＭ、ＩＰ ｏｖｅｒ ＳＤＨ／ＳＯＮＥＴ、ＩＰ ｏｖｅｒ ＷＤＭ／Ｏｐｔｉｃａｌ等技术是未来ＩＰ传送技术、多媒体通信网络技术的竞争焦点,当前较为实际的信息网络结构和演变是将ＡＴＭ和ＳＤＨ技术层中的冗余部分取消,将其精华分别集成到ＩＰ应用层和光层中。形成ＩＰ（＋ＡＴＭ）ｏｖｅｒ Ｏｐｔｉｃａｌ（＋ＳＤＨ）的技术模型。     

IP的理想传送技术———光互联网

电信网正面临互联钢业务和其它ＩＰ业务爆炸式增长的严峻局面，ＩＰ协议最终将成为电信网中压倒一切的主导通信协议。从发展的观点看，将ＩＰ直接在光路上传送的光互联网应该是理想的选择。要想有效地支持ＩＰ业务，必须了解其业务量特征。目前最流行的三种ＩＰ传送技术是ＩＰｏｖｅｒＡＴＭ，ＩＰ ｏｖｅｒ ＳＤＨ和ＩＰ ｏｖｅｒ ＷＤＭ。光互联网的基本结构特性使之成为未来最理想的传送技术。ＩＴＵ－Ｔ已决定于全面开始有关     

对IPoverSDH和IPoverATM的探讨

ＩＰｏｖｅｒ ＳＤＨ和ＩＰｏｖｅｒＡＴＭ是目前国际电信业正在讨论的一个热门话题，本文通过ＩＰｏｖｅｒ ＳＤＨ和ＩＰｏｖｅｒ ＡＴＭ的介绍和比较，提出自己的观点，以供探讨。     

建设新型电信级光互联网

要实现从叠加网络向统一的多业务网络的过渡,运营商需要新一代的边缘路由平台　　随着ＩＰ业务的增长,通信业在高容量光网络上的投资持续高速增长。在光层上叠加ＳＯＮＥＴ再叠加ＡＴＭ再叠加ＩＰ的运行方式已不再是必需的了。取而代之的是ＩＰ ｏｖｅｒＳＯＮＥＴ,或者ＩＰ ｏｖｅｒ ＤＷＤＭ,因而消除了不必要的开销。在这种新型网络中（即光互联网）,多协议标签交换（ＭＰＬＳ）传送正在成为融各层于一层的既提高性能,又简化网络结构的传送方式。 ＤＷＤＭ和光交换的广泛实施提供了巨大的带宽,为光互联网的发展创造了巨大的契机。…     

IP与ATM的竞争和融合

电信网、计算机网及有线电视网的业务与市场已经开始渗透与融合,在其发展过程中,ＩＰ和ＡＴＭ是当然的主角。随着基于ＩＰ的应用及ＩＰｏｖｅｒＳＤＨ,ＩＰｏｖｅｒＤＷＤＭ等宽带ＩＰ技术的迅速发展,ＡＴＭ正面临ＩＰ技术的全面挑战。但与此同时,ＩＰ与ＡＴＭ技术的结合也是当今网络技术发展的趋势,其融合体现在路由技术、ＩＰ交换与ＡＴＭ交换技术集成以及利用ＡＴＭ交换技术直接实现ＩＰ数据包的交换等方面。在相当长的时间     

电信技术讲座 第七讲 IP QOS—IP网络的关键技术

ＩＰｏｖｅｒＤＷＤＭ技术的出现对现有通信网络产生了深刻的影响。省去ＡＴＭ、ＳＤＨ ,直接将ＩＰ层建立在ＤＷＤＭ光网络上 ,是一种最简单直接的体系 ,这种方案减少了网络设备 ,减少了功能重叠 ,简化了网管 ,特别是减少了网络配置的复杂性 ,把额外的开销降到最低限度 ,提高了传输效率。通信网络最终会发展到以ＩＰ技术为基础集语音、数据和视频传输于一体的“统一网络”。那么 ,ＩＰｏｖｅｒＤＷＤＭ网络能否满足电信级业务的需要 ,使ＩＰ网络达到电信级的服务标准 ,成为支撑所有电信业务的统一平台 ,即如何在ＩＰ网络上保证用户信息的传…     

关于IP网络建设的几点考虑

在当前ＩＰ网络的建设中,采用何种技术,对用户提供什么样的服务成为非常重要的问题。骨干骨中比较流行ＩＰｏｖｅｒ ＡＴＭ,Ｐａｃｋｅｔ ｏｖｅｒ ＳＯＮＥＴ／ＳＤＨ和千兆以太网,除了ＩＰｏｖｅｒ ＡＴＭ,以上技术同样可以用于城域网,另外动态分组传送（ＤＰＴ）技术也可以用于城域网中。接入网技术有很多种类,适用于ＩＰ接入的技术有以太网,ＡＤＳＬ,ＨＦＣ和ＩＳＤＮ等。最后对ＩＰ网络的保护恢复进行了阐述。     

3种宽带IP主干网技术的比较

网络信息量爆炸式增长和ＩＰ技术的深入人心促进了宽带ＩＰ主干风的出现和发展。本比较了ＩＰｏｖｅｒＡＴＭ、ＩＰｏｖｅｒＳＤＨ和ＩＰｏｖｅｒＷＤＭ３种主流的主干网技术,分析了三间的特点和发展前景。     

合理构筑宽带IP网的骨干网

在ＩＰ业务的冲击下对下一代ＩＰ网络方案的讨论如火如荼。本文在对各种方案 本介绍的基础上，对ＩＰｏｖｅｒＡＴＭ和ＩＰｏｖｅｒＳＤＨ两种方案进行了比较。前者在ＱｏＳ、多业务支持及带宽管理方面具有优势２，而后者的带宽利用率较高，且组网简单。前者地传统电信运营商的网络，后者则对所新兴的ＩＰ业务运营商更为有利。     

IP-over-SONET和IP-over-ATM技术比较

Ｉｎｔｅｒｎｅｔ的快速发展对广域网带宽提出了更高的要求。Ｉｎｔｅｒｎｅｔ服务供应商（ＩＳＰ）一直在寻找更快的主干路由器互连方式。最近面市的解决方案导致许多ＩＳＰ部署了多种ＩＰ－ｏｖｅｒ－ＡＴＭ技术,如局域网仿真和一般ＩＰｏｖｅｒ ＡＴＭ技术。由于运营商提供的底层设施是在广域光纤链路上部署的ＳＯＮＥＴ或ＳＤＨ,因此人们越来越多地关注在ＳＯＮＥＴ上直接运行ＩＰ,而不是通过ＡＴＭ网络,以提高带宽效率。但是在这两种备选方案中,到底哪种技术提供了最佳方案,业内一直存在着很大的争议。 ＩＰ－ｏｖｅｒ－ＡＴＭ…     

WDM光网络上宽带IP的传送方式

综述了基于波分复用 ( WDM)技术的光网络发展以及因特网技术和 IP业务的特点 ,在此基础上介绍并分析比较了光网络上传送 IP的多种方式 ,包括 WDM光网络上ATM、SDH以及千兆比以太网与 IP网络相结合形成网络的协议和结构。最后探讨了未来宽带 IP传送网络的发展方向。     

用MPLS技术实现IP over WDM

提出了一种全新的高速宽带组网技术－基于MPLS的IPoverWDM网络技术,并对其进行了深入研究。这个方案在光联网技术中综合了目前先进的MPLS流量工程控制技术,特别适合于由可重构的OADM和OXC组成的以数据业务为核心的互联网络系统,而且它为最终在IP路由器上直接提供WDM复用功能铺平了道路。     

Integrated Survivability Strategies of IP/GMPLS/Optical Multi-layer Network

In last decade,due to that the popularity of the internet, data-central traffic kept growing,some emerging networking requirements have been posed on the todays telecommunication networks,especially in the area of network survivability.Obviously,as a key networking problem,network reliability will be more and more important.The integration of different technologies such as ATM,SDH,and WDM in multilayer transport networks raises many questions regarding the coordination of the individual network layers.This problem is referred as multilayer network survivability.The integrated multilayer network survivability is investingated as well as the representation of an interworking strategy between different single layer survivability schemes in IP via generalized multi-protocol label switching over optical network.     

Data communication in ATM networks

An increasing number of customers require LAN access with high bandwidth and low delay over long distances. To satisfy these needs, several high-speed network techniques have been developed. Asynchronous transfer mode (ATM) is superior compared to other networking technologies, as it offers high bandwidth and is scalable in the sense that the bandwidth capacity of an ATM system is not fundamentally limited to the technology itself. Initial ATM installations will operate as subnetworks of existing networks and MAC layer protocols. One of the main challenges in ATM is the transparent support of existing connectionless LAN services. Several activities have been launched within international standard bodies and forums to specify ways of providing data communication services over ATM. Most notable examples are Switched Multimegabit Data Service (SMDS) and the similar Connectionless Broadband Data Service (CBDS) supported mostly by public network service providers. But also other approaches such as IP over ATM, and LAN emulation that show more adherence to the existing local and campus area networking paradigms. The article presents the requirements and architecture of the LAN emulation service. It describes the alternative methods for carrying IP packets over ATM, a public broadband service architecture and CBDS. The traffic management aspects of the data communication services are also discussed     

Storage area networking – an introduction and future development trends

This paper presents a detailed overview of the current and future networking options within the storage arena. Particularemphasis is placed on exploring strategic storage solutions, which are based on metropolitan area network (MAN) deployments,with respect to market influences, transmission evolution, and mediation. Evolution of storage networking is moving towards aconnecting role between multiple SAN islands and enterprise networks, across geographically dispersed networks. Thisconnection-based role can be typically over WANs or MANs and can be achieved in a number of ways – dark fibre point-topoint,ATM/SDH circuits and WDM. This paper focuses on what are believed to be the key technologies and evolutionary trends inthis area, and discusses storage-based issues relating to optical networking, WDM, SDH, ATM, as well as connectivity over IP.     

基于ATM和SDH的宽带IP网及光因特网

本文首先简要介绍了 IP、ATM、SDH、波分复用 (WDM)等技术 ,然后综述了 IP over ATM和 IPover SDH的特点和优缺点 ,简要阐述了提出光因特网技术的缘由。最后指出了在电信与计算机融合成信息产业的过程中 ,IP over ATM和 IP over SDH将长期共存互补 ,在各自最佳应用场合和领域发挥作用 ,最终它们将过渡到光因特网。     

Evaluation of IP over WDM Network Architectures

The commonly used IP-backbone network architecture of today is IP/ATM/SDH/WDM. This architecture has many redundant functionalities and is not optimized to transport IP traffic. New approaches for simplified network architectures try to eliminate redundant functionalities and to decrease the protocol overhead and thereby transport IP as efficiently as possible over WDM-based optical networks. EURESCOM project P918 Integration of IP-over-optical networks: networking and management investigated scenarios for optimized IP transport in WDM-based backbone networks. In this paper, three architectures, namely Gigabit Ethernet, Packet over Sonet/SDH and Dynamic Packet Transport are investigated and evaluated as an alternative to the IP/ATM/SDH/WDM architecture.     

上海电信宽带IP城域网的建设

结合上海电信在宽带IP城域网上做的工作，首先分析和阐述了网络建设中的关键技术、组网方案以及与宽带ATM城域网、上海热线等现存网络的关系；接着，对宽带IP城域网上开展的业务类型进行了分析、列举；最后，展望了上海电信在宽带信息源方面的建设考虑。     

宽带IP城域网组网技术的探讨

如何选择组网技术是建设城域网的关键。本文介绍了宽带IP城域网建设的网络总体框架和结构层次,重点分析和比较了利用ATM、POS、千兆在叉网组建城域网的三种组网技术;另外还介绍了思科公司提出的包优化的光传输解决方案-动态包传送（DPT）。