HDSL access technology can transmit E1 signal over existing subscriber Copper twist pair lines, it is an economical and effective solution for high bit rate digital services to access into telecommunication networks.

• 高速数字用户线（HDSL）技术利用现有的用户双绞铜线作媒介传输E1速率信号，是把高速数字业务接入到电信网的一种经济有效的解决方法。