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    DIA企业专线上网

    关键字：
    DIA企业专线上网：即IP城域网（MAN，Metropolitan Area Network）指覆盖城市范围、为城市里各类用户提供宽带 （通常2Mb/s以上）接入的数字通信网络，IP城域网采用光纤作为主要的传输媒介来实现数据传输...