This thesis introduces the basic principle of HDSL access technology.It focuses on HDSL line coding / decoding, echo cancellation, auto adapted load balancing and the differences among them.

• 文章从理论层面简要介绍了高比特率数字用户线(HDSL)接入技术的基本原理,并对HDSL的线路编码、回波抵消和自适应均衡3项关键技术作了进一步阐述和横向比较。