Very-high-bit-rate Digital Subscriber Line 2

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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.

1 Deployment
2 References
3 See also
4 External links

[edit] Deployment

[edit] Europe

In Denmark, Cybercity is planning to provide VDSL2 in Q1 2007.^[1]

In Finland, Saunalahti will provide VDSL2 in December, 2006 to small area as a pilot project.

In France, Club Internet will probably 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 Hungary, T-Online is planning to provide VDSL2 in 2007.

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

In The Netherlands, KPN is planning VDSL2 test starting in Q4 2006.

In Portugal, Portugal Telecom is planning to provide VDSL2 in beginning of 2007, new tecnology of PTInovação (PT Labs) called mediaDSLAM can provide 100 Mbps in a long range, 4/5 km of main "source", against 0.5 km.

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.

In United Kingdom, BT Group will trial VDSL2 starting December, 2006 to small area as a pilot project.

[edit] 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.

[edit] North America

Sasktel, a crown corporation of the province of Saskatchewan, Canada, has officially announced the deployment of VDSL2. Sasktel is currently testing this technology among 100+ users on a trial basis and hopes to bring it to the mass by the end of 2007.

[edit] New Zealand

Orcon has signed a NZ$30 million deal with Siemens to roll out VDSL2 in 2007. Few details are known at this stage however, and the deployment depends on if the New Zealand government goes ahead with its regulatory package.