甘肃农业大学工学院水利水电工程.doc

6
z
.s. . . . .. .
efficiency, network security , optic fiber and channel resource risks as well as maintenance and fault analyses. The solution settles the following issues: (1) advancing network resource efficiency; (2) increasing network capacity for its bottleneck; (3) enriching the bore service types; (4) improving network security and decreasing maintenance cost; (5) making network management more convenient.
Based on the discussion of necessity of network performance optimization and employment scheme of network optimization, this thesis first studied on the key issues about network optimization, including optimizationof network structure, synchronous scheme, network survivability and capability of multi service supporting. Then
〔略〕……
technologies after network optimization, and the results show that the inde*es meet the requirementsof presentand future 5 years.
Key Words： Optical transmission network; Performance optimization; Performancesimulation;
6
.s. . . . .. .
z
ASON (Automatic Switched Transport Network)
6
.s. . . . .. .
z
目录
第1章绪论1
国外光传输网开展现状及趋势1
本论文的研究容1
第2章*地光传输网的现状及存在的问题分析2
光缆及管道现状2
网络与业务负荷现状3
核心层传输系统现状3
会聚层传输系统现状4
〔略〕
第6章总结与展望5
参考文献6
致7
附录主要英文缩写语对照表8
6
.s. . . . .. .
z
第1章 绪论
传输网是为各类业务网提供业务信息传送手段的根底设施，是通信网的重要组成局部，传输网的好坏直接制约着通信网的开展。现在各运营商的本地传输网经过近几年的快速开展已初具规模，为各项业务的开展提供了必要的通道，但也存在着一些问题。本章对国外光传输网的开展现状及趋势作了介绍，通过分析目前光传输网存在的问题，提出了光网络优化的必要性。同时对本课题的研究目的、意义、主要容及创新点作出了说明。
国外光传输网开展现状及趋势
新一代电信传输网，是电信传输网络开展的一个新的阶段，是以多波长光传输为主要手段、以IP业务为主要传输业务〔在相当长时间是IP业务和TDM业务共存〕、以ASON为目标的智能光传输网络。它是下一代电信网络的重要组成局部，能够以其高度智能