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为了促进国民经济的信息化,建设大容量、高速率信息传输网,我国公用通讯网从去年开始加快采用光同步传输系统(SDH),以适应网络数字化的发展需要。
In order to promote the informatization of the national economy and build a high-capacity and high-speed information transmission network, China’s public communications network has accelerated the adoption of the Optical Synchronization Transmission System (SDH) last year to meet the needs of the development of digital networks.