由于终端用户多种新业务的增加及运营商在投资回报、网络安全、增删及修改业务配置的灵活、快捷等方面的考虑,传输网络的结构、容量、功能较以前都有明显的变化。特别是由于互联网用户急剧上升及业务类型的增加,推动了构成互联网的城域网及干线网的节点类型在结构、功能方面出现了较大改变。TransLAN~(TM)技术的产品就是为满足光传送网及互联网的发展需求而 Due to the increase of various new services of end users and operators’ considerations of investment return, network security, addition, deletion and modification of service configuration flexibility and fastness, the structure, capacity and functions of the transmission network have obviously changed from the previous ones. In particular, due to the drastic increase in Internet users and the increase in business types, the types of nodes in the MAN and trunk networks that make up the Internet have greatly changed in terms of structure and function. TransLAN ~ (TM) technology products is to meet the needs of the development of optical transport networks and the Internet