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VDSL or VHDSL (Very High Bitrate DSL) is a DSL technology providing faster data transmission over a single flat untwisted or twisted pair of copper wires. These fast speeds mean that VDSL is capable of supporting high bandwidth applications such as HDTV, as well as telephone services (Voice over IP) and general Internet access, over a single connection. VDSL is deployed over existing wiring used for POTS (Plain Old Telephone System) and lower-speed DSL connections.
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VDSL or VHDSL (Very High Bitrate DSL) is a DSL technology providing faster data transmission over a single flat untwisted or twisted pair of copper wires. These fast speeds mean that VDSL is capable of supporting high bandwidth applications such as HDTV, as well as telephone services (Voice over IP) and general Internet access, over a single connection. VDSL is deployed over existing wiring used for POTS (Plain Old Telephone System) and lower-speed DSL connections.
Second-generation VDSL2 systems (ITU-T G.993.2) utilize bandwidth of up to 30 MHz to provide data rates exceeding 100 Mbit/s simultaneously in both the upstream and downstream directions. The maximum available bit rate is achieved at a range of about 300 meters; performance degrades as the loop attenuation increases.
Currently, the standard VDSL uses up to 7 different frequency bands, which enables customization of data rate between upstream and downstream depending on the service offering and spectrum regulations. First generation VDSL standard specified both QAM (Quadrature amplitude modulation) and DMT (Discrete Multi-Tone modulation.) In 2006, ITU-T standardized VDSL in recommendation G.993.2 which specified only DMT modulation for VDSL2.
Supply
As of 2006, the market is still small, except in Japan and South Korea, where VDSL is predominant.
- Australia
- The sole VDSL supplier is TransACT, who use VDSL for Digital TV, Internet and WAN applications over their Fibre-To-The-Curb network in Canberra.
- EFTel has commenced a rollout of VDSL2 compatible MSAN (Multi-Service Access Node) technology to exchanges across Australia as part of their BroadbandNext network. As of September 2008, EFTel have successfully installed MSANs in 55 exchanges in readiness for the ratification of VDSL2 in Australia.
- Belgium
- Belgacom is providing VDSL in parts of the country (about 6% coverage), but limited to 17 Mbit/s down and 640 kbit/s up, with a monthly download limit of 35 GB. VDSL2 coverage is at 50% in November 2007 (internal Belgacom nota)
- Brazil
- Telefonica is providing VDSL in some areas of São Paulo with plans ranging from 8 Mbit/s to 30 Mbit/s down and 5 Mbit/s up. The access is provided under Speedy brand and has no apparent bandwidth cap or limitation. The plans are offered in duos (internet + telephony) and trios (internet + telephony + digital IP TV), also known as Triple play (telecommunications), and cost up to $ 300 USD /month.
- Canada
- VDSL is offered in urban areas by MTS in Manitoba, SaskTel in Saskatchewan, and Bell Sympatico in Ontario.
- Denmark
- TDC is providing VDSL in two larger city areas in Copenhagen and Aarhus from February 2008, most urban parts (100 largest city areas) was announced for March 2008, but this was recently changed to September 2008. Cybercity has also announced plans to introduce VDSL.
