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lSDN为各类通信求提供了一种有效的手段,使人们观念上进行了一次革新。B-ISDN的发展更将人们带入一个通信的新天地。综合业务数字网(Integrated Serviees Digital Network)概念是在1972年由原ccITT首次提出来的,并给出了ISDN的定义,即:综合业务数字网(isDN)是以电
lSDN for all types of communication provides an effective means to make people a concept of innovation. The development of B-ISDN will bring people into a new world of communication. The concept of Integrated Services Digital Network was first proposed by the original ccITT in 1972 and gives the definition of ISDN: