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超高速数字用户环路（VDSL）是利用无屏蔽铜对绞线电缆（简称UTP）传输高速数字信号的新技术，将成为楼院分布系统的重要组织部分之一。本文探讨了各种对VDSL造成影响的主要因素，介绍各种VDSL的调制技术及克服VDSL主要损伤NEXT干扰的关键技术，并对各种调制技术在各方面的优劣进行了比较。
VDSL is a new technology to transmit high-speed digital signals using Unshielded Copper-Paired Cables (UTPs) and will become one of the important organizational components in the distribution system of the hospital yard. This article explores various major factors that affect VDSL, introduces various VDSL modulation techniques and key techniques to overcome VDSL major impairments of NEXT interference, and compares the pros and cons of various modulation techniques in various aspects.