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近几年来,ISDN(综合业务数字网)这个名词频频出现于各类通讯杂志中,不言而喻,ISDN时代不知不觉地悄然到来。事实上,各先进工业国目前都十分积极地进行这方面的建设。预计1995年,美国开设ISDN BRI(Basic Rate Interface)线路数为64万,日本为64万,德国为102万,法国为51万,英国为25万。 在未来5～10年中,每年线路数的增长率预计会超过
In recent years, the term ISDN (Integrated Services Digital Network) frequently appears in various communications magazines, it goes without saying that the ISDN era unwittingly quietly coming. In fact, all advanced industrialized countries are now very actively carrying out this construction. It is estimated that in 1995, the number of Basic Rate Interface (ISDN BRI) lines opened in the United States will be 640,000, Japan 640,000, Germany 1,020,000, France 510,000, and Britain 250,000. In the next 5 to 10 years, the annual growth rate of the number of lines is expected to be exceeded