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近来年,新技术的发展异常迅速。在电子、通信和计算机行业,新技术的发展更是层出不穷,如ATM、FR、SDH、VOD和FSN等等。有人因此认为,ISDN已经过时,应该跳过去,一步跨向宽带ISDN。这种看法是不对的。首先应该指出,在网络技术上,已经成熟和完善了的网络技术中,最先进的还是窄带ISDN技术。ATM和FR是很先进,且已投入使用。但目前能提供的
In recent years, the development of new technologies has been extremely rapid. In the electronics, communications and computer industries, new technologies are emerging, such as ATMs, FRs, SDHs, VODs and FSNs. Some people think therefore, ISDN is outdated and should be skipped over, one-step cross-border broadband ISDN. This view is wrong. First of all, it should be pointed out that in the network technology, the most advanced or narrowband ISDN technology among the mature and improved network technologies. ATM and FR are very advanced and put into use. But at the moment can provide