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我国公用分组交换数据网(CHINAPAC)始建于1987年,到目前已覆盖全国所有地市以上城市和部分县市,总计达700个,端口数发展到6万个。CHINAPAC以数字化率为84%的长途传输网和数字化率为97%的本地电话网为依托,网络本身已做到天地备份和动态路由功能,并且通过电话网可以将其辐射到电话网通达的所有城市,用户只需就近以专线或电话拨号方式入网,即可使用分组交换业务。目前其网络规模和技术水平巳位居世界前列,并与世界上23个国家的44个公用数据网络互联互通。到今年底,该网覆盖范围将扩大到2000个县市,总容量预计达到10万个端口。省内分组交换网也发展很快,目前覆盖全部县市的地区有:北京、天津、上海、广东、福建、山东、辽宁、广西、海南。CHINAPAC 可以提供 X·25基本业务,开放
Founded in 1987, China’s public packet-switched data network (CHINAPAC) has now covered more than 700 cities and some counties and cities in all cities in the country, with a total number of ports reaching 60,000. Relying on the long-distance transmission network with a digitization rate of 84% and a local telephone network with a digitization rate of 97%, CHINAPAC itself has the function of world-wide backup and dynamic routing and can radiate all over the telephone network to the telephone network through the telephone network City, users only need to close the line or telephone dial-up access to the network, you can use the packet switching business. Currently, its network size and technology rank the highest in the world and interoperate with 44 public data networks in 23 countries around the world. By the end of this year, the network will be expanded to 2,000 counties and cities with a total capacity of 100,000 ports. The packet-switched network in the province has also developed rapidly. At present, the regions covering all counties and cities are: Beijing, Tianjin, Shanghai, Guangdong, Fujian, Shandong, Liaoning, Guangxi and Hainan. CHINAPAC can provide X.25 basic business, open