阐述了用户接入网的定义、基本拓扑结构及接入技术。
This paper introduces the definition, basic topology and technology of subscriber Access Network.
分析了SDH网络的基本拓扑结构特点，对合理选择拓扑结构及保护方式进行组网提出建议。
Analysis is made on the features of basic topology structure of SDH network with Suggestions made to choose a rational topology structure and protective method in networking.
其次研究了三电平逆变器的三种基本拓扑结构，对各种结构的工作原理和优缺点进行了阐述。
Secondly, it researches three kinds of basic topology structure of three-level inverter and discusses working principle and the advantages and disadvantages of all kinds of structure.
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