VDSL (Very-high-speed Digital Subscriber Line) technology is a broadband transport technology that exploits existing copper telephone lines to provide high-bandwidth transport services. With VDSL modems, ordinary telephone lines are used to deliver simultaneously faster Internet access, interactive video, and high-speed data communications services. VDSL allows transfer rates of up to 58 Mbps.

VDSL is currently going through a standards issue, so it isn't widely deployed yet. The VDSL alliance favors a line coding scheme based on Discrete Multitone (DMT), a multi-carrier system that is more compatible with existing ADSL technology. The VDSL coalition favors a line coding scheme based on Quadature Amplitude Modulation (QAM), a single-carrier system that is less expensive and consumes less power.