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本文概述了宽带网的基本概念，分析了公用网开放宽带业务的背景，探讨了网络结构和演进的方式，介绍了宽带网与其它网的关系
This paper gives an overview of the basic concepts of broadband networks, analyzes the background of open broadband services in public networks, discusses the structure and evolution of networks, and introduces the relationship between broadband networks and other networks