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ＶＣＮ（游客和社区网络）系统是３Ｃｏｍ公司推出的一种提高因特网连接速度的宽带接入系统，其特色是能够在楼宇现有的电话线上提供企业级以大网速度（１０Ｍｂｉｔ／ｓ）的连接和定制Ｗｅｂ内容服务。该系统采用称之为“Ｅｌｔｈｅｍｅｔ－ｏｖｅｒ－ＶＤＳＬ”的下一代ＤＳ
The VCN (Guest and Community Network) system is a broadband access system introduced by 3Com that increases the speed of Internet connections. It features the ability to provide enterprise-class, high-speed Internet (10 Mbit / s) Connect and customize web content services. The system uses what is known as “Elthemet-over-VDSL” next-generation DS