毕业论文__基于软交换的城域网的设计.docVIP

兰州交通大学本科生课程设计 中文题目: 光通信网络保护系统的研究 英文题目: Research of Fiber Optic Network Protection System 课程：现代传输技术 学院：电信学院 专业：通信工程 班级：通信1003班 摘要 当前，光缆传输网已成为我国通信网和国民经济信息基础设施的主要部分，是公众电话网、数字传输网和增值网各种网络的基础。光缆通信网络一旦阻断，将对社会造成很坏的影响，给企业带来极大的经济损失。因此，光缆网络质量的好坏及线路的保护和恢复问题越来越引起人们的关注，也成为市场开放环境下网络运营商之间在争夺用户时重要的竞争焦点。 实现网络生存性一般有两类方法：网络保护和网络恢复。在电信网常规工作中，常常以保护机制作为第一道防线，对付光缆阻断之类的公共失效故障。在原已建成的环状SDH网中虽然已具备自愈功能，但是因为其属于逻辑路由的切换，而非物理路由的实际切换，通信量会累加到另一个方向。而光纤线路自动切换保护技术却能使网络进行实际切换，用恢复机制作为第二道防线对付网络范围的故障和失效。 　关键词：SDH；光纤线路自动保护切换；OPL。 Abstract Summary of the current, optical transmission network has become Chinas communications network and the main part of the information infrastructure of the national economy, is the public telephone network, transmission network, and various network based value-added network. Optical cable communication network once the block will have a bad effect on society, and brought enormous economic losses to the enterprise. Therefore, quality of cable network and circuit protection and recovery issues are cause quality of cable network and circuit protection and recovery issues are cause for concern, into a market under the environment of open competition between network operators in the competing for users important focus. In general there are two types of network survivability: network protection and network recovery. In general working in telecommunication networks, often as a first line of defense to protect mechanism, dealing with optical cables, such as blocking a public failure. Although in the original loop SDH network that has been built with self-healing features, but because it is part of the logical Routing switches, rather than the actual physical routing switches, traffic can add up to another direction. Fiber-optic line auto-switch protection technology can bring the network to the actual switch, use the