ADSL是Asymmetrical Digital Subscriber Loop(非对称数字用户环路)的英文缩写。ADSL通过最大限度地利用可用带宽而达到了尽可能高的数据传输速度,高速数据传输可以和语音电话、传真通讯等同时进行。这种技术的一个重要优点是ADSL是在原有的电话线的基础上进行的改造,数据信号并不通过电话交换机设备,减轻了电话交换机的负载,而基于ADSL的业务,使用的是话音以外的频带。 ADSL is an abbreviation for Asymmetrical Digital Subscriber Loop. ADSL achieves the highest possible data transfer speed by maximizing the available bandwidth. High-speed data transfer can be performed simultaneously with voice calls, fax communications, and more. An important advantage of this technology is that ADSL is a retrofit that builds on the existing telephone line. Data signals do not pass through the telephone switchboard equipment, reducing the load on the telephone switchboard. ADSL-based services use voice over frequency band.