ADSL （Asymmetric Digital Subscriber Line ，非对称数字用户环路）是一种新的数据传输方式。它因为上行和下行带宽不对称，因此称为非对称数字用户-ADSL (Asymmetric Digital Subscriber Line Asymmetric Digital Subscriber Loop) is a new way of data transmission. It uplink and downlink bandwidth asymmetry, know