A flexible and safe HD-EDN special line is presented,which is used for important people to transmit important information within a limited region,such as an enterprise.

• 文章指出了在网络带宽不断增加的今天,仍保留一定的差别服务的必要性,并提出一条灵活而安全的HD-EDN专线,在某一有限地区内(如一个企业)随时为重要人物发布重要信息之用。