论文部分内容阅读
用于当代通信系统的ＳＤＨ技术一、ＳＤＨ的由来ＳＤＨ技术是在１９８８年正式推出的。当年国际电报电话咨询委员会（ＣＣＩＴＴ）接受了美国国家标准协会（ＡＮＳＩ）制定的同步光网络ＳＯＮＥＴ概念和原理，正式改名为同步数字体系ＳＤｔｏｙｎｃｈｒｏｎｏｕＳＤｉｇｉ...
SDH technology for contemporary communications systems First, the origin of SDH SDH technology was officially launched in 1988. In the same year, the International Telegraph and Telephone Consultative Committee (CCITT) accepted the concept and principle of synchronous optical network SONET developed by the American National Standards Institute (ANSI), and officially changed its name to the synchronous digital system SDtoynchronouSDigi ...