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近几年.世界各国在已建立的四通八达电话通信网的基础上,为适应经济的发展和争夺高新技术的优势地位,明显加快了数据通信的建设.目前,各国发展最快的有分组交换数据网、连网数据库、EDI、可视图文、电子邮件、电子信箱等数据业务,市场规模正不断增大.各国电信部门和通信经营公司除提供建立在X.25、帧中继和异步传输模式(ATM)基础上的增值网业务外,还联手结成了世界性的战略同盟,提供全球性以计算机通信网为主的“信息高速公路”.推进这种业务的是一些公用公司创办的
In recent years, all countries in the world have established an all-round telephony communication network. In order to adapt to the economic development and compete for high-tech advantages, the countries have significantly accelerated the construction of data communications. At present, countries have the fastest-growing packet-switched data. Data services such as web, connected database, EDI, video, e-mail, and e-mail, etc., are increasing in market size. In addition to telecommunication companies and telecommunication operators in various countries, they provide X.25, frame relay and asynchronous transmission. In addition to the value-added network services based on the ATM model, they have jointly formed a worldwide strategic alliance to provide a global “information superhighway” based on a computer communication network. This type of business is promoted by some public companies.