Very High Speed Digital Subscriber Line 2
From Wikipedia, the free encyclopedia
VDSL2 (Very High Speed Digital Subscriber Line 2) 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.
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.
It has been standardized as ITU G.993.2.
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.
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[edit] Deployment
[edit] Europe
In Belgium, Belgacom is installing VDSL2, but it is not yet launched.
In Denmark, Cybercity is planning to provide VDSL2 in Q1 2007.[1]
In Finland, Saunalahti was to provide VDSL2 in December 2006 to small area as a pilot project, but was delayed until further notice due to low firmware satisfaction.
In Finland, Päijät-Hämeen Puhelin started providing 100Mbps/24Mbps VDSL2 subscriptions in 2007 Q1 for €69 to €79 a month.
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 offers VDSL2 services with download speed up to 50 Mbps since late 2006 in 11 cities (Fürth being city number 11). It is used to provide Triple play services.
In Hungary, T-Online is planning to provide VDSL2 in 2007.
In Italy, Telecom Italia is planning to provide VDSL2 in Q4 2007.
In Republic of Ireland, eircom is planning to start providing VDSL2 within the year 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. Telekom Slovenije is providing VDSL2 since March 5th 2007 to its customers. It offers download speeds up to 60Mbps and upload speeds up to 30Mbps.
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. Since Dec 2006 it is in use for IPTV.
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
AT&T has deployed VDSL as a part of its U-Verse service and plans to upgrade its software and firmware to VDSL2 in 2007. This should be available to nearly 18M homes by the end of 2008.
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.
BellSouth has announced plans to deploy VDSL2 starting in the middle of 2007. In 2008, they plan on having it available to 1.35 million homes. The upgrade will be available to their FTTC based customers.
[edit] New Zealand
Orcon has signed a NZ$30 million deal with Siemens to roll out VDSL2 in 2007. Orcon's network will cover Auckland, Christchurch, Wellington, Hastings, Napier, Tauranga, Hamilton, Dunedin, Nelson and New Plymouth with "packages of broadband, video services, internet television and a phone line for $50 to $60 a month[2]".
[edit] Devices
- AVM GmbH - FRITZ!Box Fon WLAN 7270
- Siemens - Gigaset SE267
- ZyXEL - P-870HW Series, P-872H, P-870MH-C1, P-870M-I1
[edit] References
[edit] See also
[edit] External links
[edit] ITU official documents
- ITU-T Recommendation G.993.2: Very high speed digital subscriber line transceivers 2 (VDSL2)
- ITU-T Recommendations: Series G
- ITU-T
- Press Release on ITU-T G.993.2
[edit] Other
- 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
- Comtrend VDSL2
- Broadcom's VDSL2 CPE solution
- Basic overview on VDSL2 (in German) Wikipedia article on VDSL2 (also focuses on "T-Home Complete", a VDSL2-based IPTV deployment in Germany)
