中兴通讯长途骨干网波分保护方式分析

引言 近期，为顺应GE／2.5G／10G等大颗粒数据业务的传送需求，并降低网络建设成本，IP Over WDM技术已逐渐成为各运营商关注的新一轮焦点技术。由于IP Over WDM技术的发展导致SDH层边缘化，IP传输将极大地依赖于WDM层面的保护，因此，IP 0VER WDM的演进对波分骨干网层面保护技术的灵活性和安全性、保护资源利用率、     

中兴通讯WDM设备光层保护技术分析

随着采用波分复用(WDM)技术的光传输网络的广泛应用，WDM设备承载业务的特点越来越朝着多类型、大容量的方向发展，由此所引发的网络生存性需求就倍加引起重视，加之与传统的电层保护技术相比较，WDM设备的光层保护技术具备快速、高效、透明的特点，目前针对WDM光网络建立完善的光层保护机制已经成为业界的普遍共识。     

WDM光线路自动倒换保护技术

在总结WDM自动保护技术及目前存在问题的基础上，介绍了WDM光线路自动倒换保护技术原理及其工程应用方案，同时提出了在工程应用时应注意的一些问题。     

OTN在城域网中的应用

1OTN的含意OTN是指为客户信号提供波长、子波长上进行传递,复用,交换,监控和保护恢复的技术;对点对点的WDM线路系统基础上,增强节点汇聚和交叉能力,组网保护和OAMX理能力,其吸收了SDH和WDM的优点,具备完善的保护和X理能力,将成为大颗粒XX业务传递的主流技术。2OTN技术的定位     

中兴通讯长途骨干网波分保护方式分析

引言 近期,为顺应GE/2.5G/10G等大颗粒数据业务的传送需求,并降低网络建设成本,IP Over WDM技术已逐渐成为各运营商关注的新一轮焦点技术.由于IP Over WDM技术的发展导致SDH层边缘化,IP传输将极大地依赖于WDM层面的保护,因此,IP OVER WDM的演进对波分骨干网层面保护技术的灵活性和安全性、保护资源利用率、保护方式的高效率等方面均提出了严峻挑战.     

WDM光环形网络保护及实现方法

提出了WDM环形网络的几种保护方案,分析了利用1:1环路配置方式进行WDM光环形网络保护的实现方法,简单介绍APS在环保护中的应用。     

城市光传送网WDM环网技术要求

介绍了WDM环网的主要技术,以及WDM环网在城市应用时应考虑的一些因素。 宽带城市网;;城市光传送网;;WDM环网;;波长转换器保护倒换子速率复用     

IP over WDM光网络联合保护策略

随着Internet和网络技术的发展,IP over WDM光网络成为下一代通信网最理想的解决方案。因此,IP over WDM光网络的生存性是下一代通信网成功与否的关键。在传统的保护策略中,IP层和WDM层之间不交换网络的状态信息。探讨了IP层和WDM层保护机制互相协作的必要性,并在通用多协议标签交换GMPLS的基础上,提出了联合保护策略的思想。     

陕西移动IP over WDM实施思路探索

文章从IP网络自身的保护、WDM的保护管理、人员技术水平等方面就陕西移动实施IP over WDM的技术可行性、投资进行了分析,并通过介绍陕西移动IP over WDM的实施情况,与业界同行分享陕西移动在全IP移动网络建设和运营方面的探索。     

波分复用（WDM）网元管理系统的技术要求

介绍了波分复用(WDM)网元管理系统的技术要求,其中包括WDM系统网络管理的分层结构、WDM系统的网元划分以及EMS系统的一般要求、管理功能、系统性能、网管系统保护、网管系统接口等。     

突飞猛进的光通信技术

随着ＭＰＬＳ、ＤＷＤＭ、数字包封、波长选路及ＷＤＭ保护环网等新技术的开发,ＷＤ Ｍ光网络层已具有许多原先只能在高层实现的网络功能。原先单纯为了增加系统传输容量的ＷＤＭ技术,已转化为具有真正联网功能的多波长光网络技术,为彻底抛弃ＳＯＮＥＴ／ＳＤＨ,直接在具有光联网功能的 ＷＤＭ多波长光网络上承载 ＩＰ业务创造了条件。     

城域波分组网的若干关键因素考虑

在结合技术原理与实际经验的基础上,基于城域波分技术的特点,论述了城域波分组网设计时的功能和性能要求,重点探讨了保护方式、OSNR指标、功率和色散预算等方面的技术要求。     

Planning of WDM Ring Networks

The rapid introduction of wavelength division multiplexing (WDM) technology to cope with the increased bandwidth requirements of transmission networks has intensified the need for recovery mechanisms at the optical layer. A first step towards survivable optical networking will be seen through the introduction of optical rings. This paper presents different types of optical rings (dedicated and shared protection WDM rings) and the planning issues associated with these WDM rings. In particular, we give mathematical models as well as solution methods for the ring loading and wavelength assignment problem. We compare the wavelength requirement of dedicated and shared protection rings under scenarios with different demand patterns. We also discuss the influence of the WDM equipment cost, and present a mathematical model for the optimization of hybrid networks with both dedicated and shared protection rings.     

Differentiated QoS for survivable WDM optical networks

Optical networks based on WDM technology have become a promising solution to realize transport networks that can meet the ever-increasing demand for bandwidth. As WDM networks carry a huge volume of traffic, maintaining a high level of survivability is an important and critical issue. The. development of GMPLS switching technology led to the direct integration of IP and WDM. In these IP-over-WDM networks different applications/end users need different levels of fault tolerance and differ in how much they are willing to pay for the service they get. The current trend in network development is moving toward a unified solution providing support for voice, data, and various multimedia services. Therefore, it imperative that WDM networks incorporate fault tolerance to single or multiple component failures, protection bandwidth, recovery time, and recovery granularity besides resource utilization and call acceptance ratio. This article presents a survey of various methods that have been proposed for providing service differentiation in survivable WDM networks and discuss their performance. Such methods are broadly classified under various paradigms such as differentiated reliability, R-connections, quality of protection, and quality of recovery.     

波分复用网络的保护方式

首先介绍了在WDM网络中常用的光通道保护、光复用段保护方式及其实际使用方案,然后对WDM网络中采用不同保护方式的优缺点进行了分析,并对WDM网络中保护方案的设计提出了建议.     

WDM在本地网中的组网与保护

本文对WDM在本地网中的组网方式及保护进行了探讨 ,认为组网中首先应考虑建环网 ,并辅以链形结构。组网应综合考虑目前设备状况下的组网形式和将来可能的组网形式。由于目前WDM系统还不能做到光层上的保护 ,建议采用在SDH层面上保护。     

ATM网络抗毁和自恢复技术研究

基于ATM/MPLS技术的通信网络是承载宽带多媒体业务的综合平台。为了对承载业务进行抗毁保护,对ATM的最基本的1+1、1∶1、m∶n抗毁保护结构进行了研究和总结。同时结合网络传输层,如:PDH、SDH、WDM、MPLS的保护和应用层业务,如:IP、电路交换、以太网和帧中继的抗毁迂回策略,提出了ATM的多层次抗毁自恢复组网结构,为ATM的应用研究提供了借鉴。     

IP/MPLS over WDM网中考虑链路 负载平衡的保护设计

利用网络链路资源被占用的部分信息实现保护资源共享,可以极大地改善网络对业务的丢弃性能.这对采用多协议标记交换(MPLS,Multiprotocol Label Switching)技术的IP over WDM网络来说,并不需要太大的代价.基于此,本文提出了在IP over WDM网中考虑通路保护的动态路由算法.对工作通路的选取,算法对选路成本和路由长度作了折衷考虑;而对于保护通路,则对其共享能力和路由长度作了权衡.仿真结果表明,本文算法不管是对业务的丢弃性能,还是对网络的链路负载平衡度,均取得了较满意的结果.     

On joint protection/restoration in IP-centric DWDM based opticaltransport networks

Previous advances in WDM technology are now beginning to shift the focus more toward optical networking and network-level issues. Providing survivability at the optical layer is inherently attractive, but whether it makes practical sense, given similar mechanisms that are already available at the higher layers, poses serious challenges and raises many questions. Today's core network architecture model has functional overlap among its layers, contains outdated functionality, and is too slow to scale. If IP can be mapped directly onto the WDM layer, some of the unnecessary network layers can be eliminated, opening up new possibilities for developing a simple and integrated-protection/restoration scheme that can be coordinated at both the IP and WDM layers. This article presents an overview of existing optical protection/restoration schemes. Then we present a novel mesh-based hybrid optical protection scheme that utilizes multifiber physical links along with a hierarchical OXC structure. An overview of the envisioned IP-centric DWDM-based optical data network architecture is then presented. The basis of how to implement a more direct IP standard-based approach for closer and efficient IP-WDM integration is also discussed. Finally, we articulate a view of how to provide a joint protection/restoration scheme that is coordinated at both the IP and WDM layers