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Very-high-bit-rate digital subscriber line 2

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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 (1640 ft) and 50 Mbit/s at 1 km (3280 ft), but degrades at a much slower rate from there, and still outperforms VDSL. Starting from 1.6 km (1 mile) its performance is equal to ADSL2+.

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 (2 ½ to 3 miles), gradually increasing the bit rate up to symmetric 100 Mbit/s as loop-length shortens. This means that VDSL2-based systems, unlike VDSL1 systems, are not limited to short local loops or MTU/MDUs only, but can also be used for medium range applications.

Profiles

VDSL2 is a quite complex protocol, and the standard defines quite an amount of different profiles that can be used in different VDSL deployment architectures (in the central office, in the cabinet or in the building).

Profil Bandwidth (MHz) Number of carriers Carrier bandwidth (kHz) Power (dBm) Max. Throughput (Mbit/s, symmetric)
8a 8,832 2048 4,3125 +17,5 50
8b 8,832 2048 4,3125 +20,5 50
8c 8,5 1972 4,3125 +11,5 50
8d 8,832 2048 4,3125 +14,5 50
12a 12 2783 4,3125 +14,5 68
12b 12 2783 4,3125 +14,5 68
17a 17,664 4096 4,3125 +14,5 100
30a 30 3479 8,625 +14,5 100

Deployment

Europe

In Belgium, Belgacom announced it will provide HDTV services (20Mbps) using VDSL2 to 60% of the households by Spring 2008. Belgacom is rolling out Alcatel-Lucent VDSL2 equipment in over 11,000 street cabinets.

In Denmark, Cybercity is planning to provide VDSL2 in spring 2007,[1] and TDC is planning to provide VDSL2 from June 1.st 2007,[2]

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 100 Mbit/s/24 Mbit/s VDSL2 subscriptions in 2007 Q1 for €69 to €79 a month.

In Finland, Nebula started providing VDSL2 pilot subscriptions during June 2007. Pilot is currently available for quite limited area, but it's probably expanding soon. €149 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.
Erenis is deploying VDSL1 & VDSL2 at the basement: FTTB

In Germany, T-Home, the landline division of Deutsche Telekom, offers VDSL2 services with download speeds up to 50 Mbit/s and upload speeds up to 10 Mbit/s based on FTTC. It is used to provide Triple play services. The service started in late 2006 and is offered in 11 cities on a regular basis. There will be a deployment of 15 further cities to the end of 2007.

In Hungary, T-Online is planning to provide VDSL2 in 2007.

In Italy, Telecom Italia is planning to provide VDSL2 in Q4 2007. Azienda Sanitaria Locale 3 "Genovese" is doing a trial of Versatek VX-VER160 in campus networks.

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, Clix (ISP) and Portugal Telecom is planning to provide VDSL2 in 2007 end, new technology of PTInovação (PT Labs) called mediaDSLAM can provide 100 Mbit/s in a long range, 4/5 km of main "source", against 0.5 km.

In Spain, Jazztel and Telefónica are testing the deployment of VDSL2. They are planning to provide VDSL2 in 2007 or 2008 start.

In Slovenia:

Voljatel is providing VDSL2 to enterprises.
Telekom Slovenije is providing VDSL2 since March 5th 2007 to its customers.
T-2 is providing VDSL2 to customers since May 2007 and it offers speeds up to 60/25 Mbit/s.

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

In Sweden, Telenor and Telia are negotiating a joint venture to deploy the VDSL2 infrastructure at a cost of 10 billion Swedish kronor. [3]

In Switzerland, Swisscom is deploying VDSL2 and it is now available to customers since July 1st 2007. Since Dec 2006 it is in use for IPTV.

In Turkey, Turkish state-regulated monopoly Turk Telekom is said to begin VDSL2 trials in September 2007 with service planned for 2008 (per article in Turkish daily Hurriyet dated 19 March 2007, p. 10).

In United Kingdom, BT Group trialed VDSL2 during 2006. BT currently plans to launch ADSL2+ from early 2008 as part of its 21CN program to upgrade of its core network. In July 2007, Sir Christopher Bland, the chairman of BT said that BT was considering fibre to the curb and that VDSL2 was a 'likely development going forward' but that no final decisions had yet been taken.

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.

In Macau, CTM start to test VDSL2 at the 3rd season of 2007. First will be tested in two main buildings in Macau.

North America

AT&T has deployed Alcatel-Lucent VDSL2 equipment in street cabinets as a part of its U-Verse service and plans to cover 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.

New Zealand

Orcon has signed a NZ$30 million deal with Siemens to roll out VDSL2 in 2008. 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[4]".

Devices

  • 2Wire - i3800V
  • AVM GmbH - FRITZ!Box Fon WLAN 7270
  • NetSys - NV-600L, NV-600R
  • Siemens - Gigaset SE267
  • ZyXEL - P-870HW Series, P-872H, P-870MH-C1, P-870M-I1
  • Versa Technology - VX-VER160, VX-VER165, VX-MD3024, VX-MD3048
  • Zhone Technologies - 6610-A1

References

  1. ^ Press release
  2. ^ Press release
  3. ^ Swedish news article
  4. ^ NZHerald.co.nz Article

See also

ITU official documents

Other

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