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早在九十年代初的国外教科书上就有了城域网MAN(MetropolisArea Network)的概念。在国内,城域网是连接政府机关、教育科研等企事业单位、公司和家庭用户的宽带接入网以及和国外连接的Internet接口。它既是Internet网在本地的延伸,又是本地的公共信息服务平台。而之所以直到今天还来谈城域网,可以说城域网这颗前人种下的硕果终于到了收获的时机。一是在技术上网络发展的越发成熟为城域网建设奠定了坚实的基础。二则是各种网络应用,尤其是宽带应用和服务的蓬勃兴起对宽带的迫切需求,这也是城域网建设日举国受到重视的更为重要的原因。
As early as the early nineties foreign textbooks have MAN (MetropolisArea Network) concept. In China, metropolitan area network is to connect government agencies, education and scientific research institutions and enterprises, companies and home users broadband access network and the Internet interface and foreign connections. It is both an extension of the Internet network and a local public information service platform. The reason why until today to talk about metropolitan area network, it can be said that the achievements of MAN predecessors planted finally to the harvest. First, the more mature technology in the development of the network laid a solid foundation for the construction of MAN. The second is a variety of network applications, especially the rapid rise of broadband applications and services on the urgent need for broadband, which is also the metropolitan area network construction day by country more attention to the more important reason.