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1.前言 CCITT在1976年召开了第6次会期(1973～1976)的最后会议,通过了有关公共分组交换网和计算机间接口的X.25建议。所谓CCITT,是联合国下属各国主管部门为在国际上统一有关电气通信格式的讨论场所。在第6次会议之后,连续编制了电报型数据终端与分组网相连接时的接口(1977年)、在国际连接时分组网之间接口的建议(1978)年。这些一连串紧急行动,是为适应计算机的普及,各国都
1. INTRODUCTION The CCITT held its last meeting of its sixth session (1973-1976) in 1976, adopting the X.25 recommendation on the public packet-switched network and inter-computer interfaces. The so-called CCITT is a forum where the competent agencies of the UN subordinate organizations discuss the international harmonization of formats for electrical communications. Subsequent to the 6th meeting, an interface (1977) for telegraph data terminals connected to a packet network and a recommendation (1978) for interfacing between networks during international connectivity were continuously prepared. These series of urgent actions are to adapt to the popularization of computers and all nations