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信息高速公路的基础设施──数字数据网ＤＤＮ路澎ＤＤＮ是数字数据网（ＤｉｇｉｔａｌＤａｔａＮｅｔｗｏｒｋ）的英文缩写。邮电部于１９９２年就将ＤＤＮ列为重点项目来抓。建设ＤＤＮ网络主要是满足非话业务数字化传输的需要，同时作为基础业务设施网络向社会公众、金...
Information Highway Infrastructure - DDN DDN is an abbreviation for Digital Data Network. The Ministry of Posts and Telecommunications in 1992 will DDN as a key project to grasp. Construction of the DDN network is mainly to meet the needs of non-voice service digital transmission, while as a basic business facilities network to the public, gold ...