非对称数字用户线路(Asymmetric Digital Subscriber Line,ADSL)技术是进行高速Internet接入的优选方案,这是因为它在几个关键问题上功能强大。 首先,也是最重要的,ADSL为未来的Internet用户们提供了对近平全球范围的访问。基于ADSL的服务使用现有的铜质用户线,这种线为世界上的大多数人们提供了电话服务。整个地球上布着大约六亿四千万条这种线,均能支持ADSL传输,其普及程度是任何其它接入类型的网络所无可比拟的。 Asymmetric Digital Subscriber Line (ADSL) technology is the preferred solution for high-speed Internet access as it is powerful on several key issues. First and foremost, ADSL provides future Internet users worldwide access to near-universal communications. ADSL-based services use existing copper subscriber lines, which provide telephone service to most people in the world. Approximately 640 million lines of this earth are supported on ADSL transmissions that are unmatched by any other type of access network.