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DDN安装维护经验李栋,万小丹(西安市电信局数据通信分局西安710003)DDN是利用数字信道来传输数据信号的数据传输网,它是采用数字交叉连接技术组成的以提供高速数据传输业务的数字数据网。它的优点有以下几点:()传输速率高,由于DDN采用PCM数字信...
DDN Installation and Maintenance Experience Li Dong, Wan Xiaodan (Data Communication Bureau of Xi’an Telecom Bureau, Xi’an 710003) DDN is a data transmission network that uses digital channels to transmit data signals. It is composed of digital cross-connect technology to provide high-speed data transmission services Digital data network. Its advantages are the following: () high transmission rate, due to DDN PCM digital signal ...