VDSL2 (Very-High-Bit-Rate Digital Subscriber Line 2, ITU-T G.993.2 Standard) is an access technology that exploits the existing infrastructure of copper wires that were originally deployed for POTS services. It can be deployed from central offices, from fibre-fed cabinets located near the customer premises, or within buildings.

ITU-T G.993.2 VDSL2 is the newest and most advanced standard of DSL broadband wireline communications. Designed to support the wide deployment of Triple Play services such as voice, video, data, high definition television (HDTV) and interactive gaming, VDSL2 enables operators and carriers to gradually, flexibly, and cost efficiently upgrade existing xDSL-infrastructure.

ITU-T G.993.2 (VDSL2) is an enhancement to G.993.1 VDSL that permits the transmission of asymmetric and symmetric (Full-Duplex) aggregate data rates up to 200 Mbit/s on twisted pairs using a bandwidth up to 30 MHz.

VDSL2 deteriorates quickly from a theoretical maximum of 250 Mbit/s at 'source' to 100 Mbit/s at 0.5 km and 50 Mbit/s at 1 km, but degrades at a much slower rate from there, and still outperforms VDSL. Starting from 1,6 km its performance is equal to ADSL2+.

ADSL-like long reach (LR) performance: ADSL-like long reach performance is one of the key advantages of VDSL2. LR-VDSL2 enabled systems are capable of supporting speeds of around 1-4 Mbit/s (downstream) over distances of 4 to 5 km, gradually increasing the bit rate up to symmetric 100Mbit/s as loop-length shortens. This means that VDSL2-based systems, unlike VDSL1 systems, are not limited to short loops or MTU/MDUs only, but can also be used for medium range applications.

Deployment

Europe

In France, Club Internet will maybe start commercial services in 2006 if the ARCEP (French regulator) allow its usage, France Telecom in 2007.

In Germany, Deutsche Telekom has announced that will invest €3B to deploy Triple play services from 2006 onwards.

In Italy, Telecom Italia is planning to provide VDSL2 in Q4 2007.

In Slovenia, Voljatel is providing VDSL2 to enterprises.

In Sweden, Bredbandsbolaget AB are conducting VDSL2 tests as of October, 2005.

In Switzerland, Swisscom is deploying VDSL2 and plan to provide it to the customers in 2006/2007.

Asia

In Singapore, SingTel tied up with Ericsson to deploy a technical trial of VDSL2 starting June 2006. No service plans announced as of yet.

See also

• FTTX
• UDSL

External links

• ITU-T G.993.2 (VDSL2) Standard
• ITU-T Recommendations: Series G
• ITU-T
• Press Release on ITU-T G.993.2
• The UNH-IOL DSL Knowledgebase (advanced tutorials)
• Migrating to VDSL2 ... includes graphs Download/Upload speeds vs. Distance for VDSL2/ADSL2(+)
• VDSL2 for Business Services: A New Frontier for DMT Technology
• Future Proof Telecommunications Networks With VDSL2
• The Standardization of VDSL2
• Conexant
• Netopia
• Aktino
• Ikanos
• Deutsche Telekom opts for VDSL2
• Infineon's VDSL2 Solution
• Infineon VINAX solution used by Deutsche Telekom
• VDSL2 Blog (in French)
• Overview and Deployment Issues