Very High Speed Digital Subscriber Line

What Does Very High Speed Digital Subscriber Line Mean?

Very high speed digital subscriber line (VDSL) is a DSL technology that provides a faster data transfer rate than asymmetric digital subscriber line (ADSL) and ADSL2+ technologies. It sends out data in the 13 to 55 Mbps range over small distances, which are typically between 330 to 1650 yards of twisted pair copper wire. The shorter the distance, the higher the data transfer rate. VDSL enables users to upload, download and process data more rapidly.


Techopedia Explains Very High Speed Digital Subscriber Line

VDSL is known as the next generation DSL, operating at data transfer rates of up to 52 Mbps for downstream and 12 Mbps for upstream. VDSL architecture is based on two technologies, quarantine amplitude modulation (QAM) and discrete multitone modulation (DMT), which are not compatible with each other. DMT technology is most commonly used by equipment manufacturers. The VDSL connection is based on DMT architecture and consists of 247 virtual channels, which populate the available bandwidth.

VDSL is capable of providing services like high-definition television (HDTV) and video-on-demand (VOD) along with Internet access. VDSL may be bundled with HDTV packages as it establishes a presence in the marketplace.


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Technology Expert

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.