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我国第一个公用数据分组交换网CNPAC(Computer Packet Siwitchng Telecom-munication Network)于1989年10月由邮电部正式开通运行。此网由一个双机组成的网络处理中心(NMC)和设在北京、上海和广州的三个节点机(PSX)和八个集中器(PCU)组成,通过北京的国际出入口局按X·25通讯规程接入国际分组交换网,网内设备是法国SESA公司的产品,PSX和RCU是DPS 25Ⅱ型设备,NMC是BULL公司的MIN 16/450小型计算机。
China’s first public data packet switching network CNPAC (Computer Packet Siwitchng Telecom-munication Network) in October 1989 by the Ministry of Posts and Telecommunications officially opened. The network consists of a dual networked processing center (NMC) and three node machines (PSX) and eight concentrators (PCU) in Beijing, Shanghai and Guangzhou. The network is operated at an X.25 Communication protocol access to the international packet switching network, the network equipment is the French SESA company’s products, PSX and RCU are DPS 25 Ⅱ type equipment, NMC is BULL’s MIN 16/450 small computer.