一、概述在当今通信飞速发展的社会里 ,通信技术的应用已成为企事业单位、社会团体之间信息交流的主要方式。而且随着数字通信技术的不断发展 ,网间通信、媒体通信及企业内虚拟专线网对数据专线的要求已较为普遍 ,用户所需求的专线速率已由一般的９．６ｋｂ/ｓ上升至２Ｍｂ／ｓ I. Overview In today’s rapid development of communication society, the application of communication technology has become the main means of information exchange between enterprises and institutions and social organizations. And with the continuous development of digital communication technology, the requirements for data leased lines in inter-network communication, media communication and intra-enterprise virtual private networks have become more common. The leased line speeds required by users have risen from the general 9.6kb / s to 2Mb / s