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ADSL(非对称数字用户线路)是目前宽带接入的主流技术之一,它利用一对电话线为用户提供数据和语音的传输,成本合理,因此受到用户的青睐。但是,到目前为止,并非所有对ADSL业务有需求的用户都能得到满足,这是因为有近50％的用户是通过远程终端,如DLC(数字环路载波)获得语音服务的,而目前的远程终端大多数仅支持语音而不支持DSL。
ADSL (Asymmetric Digital Subscriber Line) is one of the mainstream technologies for broadband access. It uses a pair of telephone lines to provide users with data and voice transmission at a reasonable cost and is therefore favored by users. However, to date, not all subscribers who demand ADSL services can be satisfied because nearly 50% of subscribers receive voice services through remote terminals such as DLC (Digital Loop Carrier) Most remote terminals support voice only and do not support DSL.