VDSL
VDSL or VHDSL (Very High Bitrate DSL)[1] 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 Service) and lower-speed DSL connections. This standard was approved by ITU in November 2001.
Second-generation VDSL2 systems (ITU-T G.993.2 Approved in February 2006) 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. The third largest consumer market is in Germany where VDSL is available in over 50 major cities.
- 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.[2]
- iiNet began trialing VDSL in the Domus apartment complex in Perth in December 2008 offering 100Mbit/50Mbit speeds including 3 months free, and a free modem with uploads counted in the data limits.[3]
- GVT is providing a VDSL network, that reaches speeds up to 50mbps and 3mbps upload in your service plans. The company uses equipment of "Keymile corp."
- VDSL is offered in urban areas by MTS in Manitoba, SaskTel in Saskatchewan, Telus in Alberta and British Columbia, Bell Internet in Ontario, Bell Aliant in Atlantic Canada, and Bell TV's service in some large multi-residential buildings in certain urban centres.
- 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. Telenor as well as Fullrate has also announced plans to introduce VDSL.
- Provided in Oulu by DNA, in Turku by Auria, in various cities by Nebula and in Helsinki by 24 Online. The services provided in Turku and Oulu are actually based on Cisco's LRE. A few universities also provide fiber-optic VDSLs to their students.
- Erenis (bought by Neuf-Cegetel, now part of SFR) is offering both internet and telephone over VDSL in Paris. The broadband is 60 Mbit/s down and 6 Mbit/s up[4]
- VDSL2 is currently available in 50 major cities with 25/5 Mbit or 50/10 Mbit downstream/upstream. The infrastructure is mostly owned by T-Online, subsidiary of Deutsche Telekom, and based on VDSL2 technology with FTTC. The theoretical bandwidth right now is 100/100Mbit (synchronous line) downstream/upstream, but is limited by T-Home to 50/10 Mbit downstream/upstream. While VDSL2 was originally only available to customers who purchased the triple play package "Entertain" (starting at 54.95 € per month for 25/5 Mbit or 59.95 € for 50/10 Mbit), VDSL2 is now also available to double play customers (starting at 44.95 € for 25/5 Mbit, with 50/10 Mbit available as an option for an additional 5 € per month). Competing providers, such as 1&1 and Hansenet, provide double and triple play services on top of Deutsche Telekom's VDSL2, although operating telephony as an NGN service. Local providers like Netcologne offer up to 100/10 rates. Deutsche Telekom limitates the monthly traffic of those lines (100GB/Month for 25/5 Mbit/s and 200GB/Month for 50/10 lines). If an user gets over that limit his line rate will be reduced to 6/0.5 Mbit/s till end of the month.
- Starting in October 2008 the largest Hungarian incumbent offers 25 Mbit/s subscriptions to approximately 100 000 households after upgrading part of their network to VDSL.[6]
- VDSL is offered by HGC and PCCW. A 10 Mbit/s up and up to 30 Mbit/s down connection costs less than $11–34 USD/month with a 18-month to 24-month contract (price is negotiable and each customer get different prices and plans), with unlimited traffic.
- Provided in Akureyri/North East by Tengir.
- VDSL plans announced by major ISP (MTNL), launching soon
- Eircom is to trial VDSL at speeds of 60Mbps in November or December 2009. There have been no official public statements yet but the Dundrum exchange will be part of the trial. It is planned to launch the service in 2010 for some exchanges [7].
- On August 28, 2009 Bezeq communication company started testing VDSL with 20, 25, 30 and 40Mb (Asymmetric, up speed 1000Kb) in certain areas in north Israel.
- As seen on the final show of "The Big Brother" the service will offer download speeds of up to 50Mb.
- VDSL will be officially provided at 2009/2010 by Bezeq communication company.
- VDSL is offered by NTT under the product name, B-Flets. TEPCO, KDDI, and SoftBank also offer competing VDSL services.
- A major difference between Japan's VDSL offerings compared with installations in other countries is that Japan chooses to use an FTTx access line network architecture, as opposed to using copper lines.
- Alcatel Lucent is also a provider of VDSL in Malaysia.
- Telekom Malaysia is planning to deploy combine technology with VDSL.
- VDSL Network S.B. has also been a provider of VDSL technology for more than 3 years in Malaysia.
- VDSL is being rolled out mostly in the Hotel Industry in Mauritius by a private Network Solution Integrator company, Enterprise Data Services Ltd (EDS LTD). EDS is not an ISP, but provide the VDSL in hotels as opposed to the expensive cost of Fiber Optic. The service enables the hotels to provide both wired and wireless Broadband Internet access, Video On Demand and Music on Demand as well as IP telephony to the residents. Since November 2004, till date, EDS has already completed such installation in 12 hotels.
- VDSL roll-out is being tested by the company KPN. KPN hardly invested in ADSL2+ in 2006, despite the current coverage of only 57% (2007), because they see a better future in VDSL.
- VDSL is rolled out by Tele2 in 25 different cities on September 1 2009.
- VDSL will be released within a one kilometre range of the Auckland city exchange by Vodafone, who plans to extend coverage after this 'test'. Testing also occurring for friendly users in Glenfield and Ponsonby.
- VDSL2 announced by TelstraClear on 16 October 2008, will be released in seven main centres, including Wellington, Christchurch, Auckland, and Napier. With speeds of up to 30 Mbit symmetrical.
- From March 2009, VDSL2 line cards will be progressively installed into all roadside cabinets and local telephone exchanges in towns and cities with more than 500 lines by Telecom.
- VDSL2 announced by NextGenTel at the start of 2009, and it is now available in Norway. NextGenTel offers Internet speeds ranging from 30 Mbit/s / 5 Mbit/s and 40 Mbit/s / 20 Mbit/s. It costs about 85 to 100 $ per month.
- VDSL is offered in urban areas by Romtelecom at speeds of 20/2 Mbit or 30/3 Mbit downstream/upstream for €9.99 per month, and €14.9 per month respectively (VAT included).
- VDSL appeared on 8 February, 2005. It is provided by SCTS, offers Internet speeds ranging from 4 Mbit/s / 1.5 Mbit/s to 12 Mbit/s / 6 Mbit/s at Saratov city. Connection costs around €7-50 per month (including 125-1024 MB of external incoming traffic). Traffic costs around €0,03-0,05 per megabyte.
- VDSL appeared on 1 October, 2005. It is provided by T-2, offering triple play services with Internet speeds ranging from 1 Mbit/s / 256 kbit/s to 60 Mbit/s / 25 Mbit/s at more than 120 locations across the country (75% coverage). A 40 Mbit/s / 15 Mbit/s connection costs €56 per month.
- KT and other several providers offer VDSL in the place where FTTH is not available. The speed is varied from 4Mbit/s to 100Mbit/s by payment plans, about $25–$40 USD/month.
- VDSL roll-out by Telefonica began in 2005 in selected places in Madrid. Commercial launch up started on September 2009 (triple play)[8] and December 2009 (double play)[9].
- Bredbandsbolaget AB supplies fiber-optic VDSL, but not officially.
- Used in the Bluewin TV television-over-IP service and in the DSL service with 15 Mbit/s downstream and 1 Mbit/s upstream, introduced in July 2007. The city of Zurich had a vote about putting VDSL infrastructure in place in 2007 which was approved by the voters. This "Fiber to the Home" network will be run by the cities power company and will offer maximum speeds of around 100Mbit bandwidth though it's not clear what the upload speeds or pricing will be. The Swiss telecom giant Swisscom offers VDSL in most of Switzerland.
- The VDSL modem is, and never marketed as such, a final link between the telephone line and their building's fiber terminal. As of 2009, FTTB service bandwidth is 10 Mbps download and 2Mbps upload, and is a major improvement over ADSL in terms of attaining maximum contract bandwidth.
- Turk Telekom announced it would offer VDSL2 services for resale by Turkish ISPs as of July 1, 2008 across 73 of Turkey's 81 provinces, however service is still unavailable in most locations. Two packages in the form of 16Mbit download/1Mbit upload or 32Mbit download/1Mbit upload speeds were announced. 16Mbit will sell for approximately $70, while 32Mbit will sell for $90.[10] Turkish ISP's that will offer the service include TTNET, TurkNet, Tellcom, Biri and Smile
- Qwest provides Internet access and television service over FTTN VDSL in Denver, Colorado, Phoenix, Arizona, and Saint Paul, Minnesota. In Saint Paul, Qwest's rate structure extends up to 40 Mbit/s downstream and 20Mbit/sec upstream, for $109/month. Other locations are known to support up to 20Mbit/s downstream for ~$100/month.
- AT&T provides Internet and television service over VDSL in 25 cities under the trade-name U-verse. The AT&T service is based on FTTN, Fiber to the Node and FTTP is also used.
- Verizon offers its FiOS service in some metropolitan areas at speed of up to 50 Mbit/s. The Verizon service is based on FTTP, and normally CAT5e Ethernet (or MoCA over coax) is used to deliver data service throughout the home. However, VDSL is used in MDUs when running CAT5e or coax to individual units is not practical.
Openreach, the Access Network delivery arm of BT Group has conducted successful trials this year of VDSL using FTTC technology in the Muswell Hill area of North London. Following this trial national rollout has commenced under the banner of NGA (Next Generation Access) starting with selected exchange areas around the UK. This represents a significant investment by the company in the future of broadband access within the UK. The product will initially offer downstream bit rates of up to 40 Mbit/s dependent on the distance between the new DSLAM street-cabinet and the end user's premises, although Openreach will be investigating other technologies which could increase this to a potential 60 Mbit/s in the future. Alongside this Openreach are conducting additional trials into the deployment of FTTP (Fibre to the Premises) which although more expensive & complex to implement can provide downstream rates of up to 100 Mbit/s and is thought to be more future proofed than FTTC. Original projections indicated that FTTC was significantly cheaper to implement than FTTP, however current thinking is that the cost difference between the two technologies may be smaller than at first envisaged.
See also
References
- ^ KPN - KPN starts VDSL trials
- ^ BroadbandNext Update - ASX announcement
- ^ iiNet's VDSL webpage
- ^ http://www.erenis.fr/
- ^ http://www.in.gr/news/article.asp?lngEntityID=1031868&lngDtrID=252
- ^ Csomagban kínált szolgáltatások, VDSL-internet és új ADSL-csomagok a Magyar Telekom új márkájának égisze alatt
- ^ http://archives.tcm.ie/businesspost/2007/11/04/story27834.asp
- ^ http://bandaancha.eu/articulo/6784/telefonica-lanza-trio-futura-vdsl-informa-cobertura
- ^ http://bandaancha.eu/articulo/6976/telefonica-lanza-duo-linea-internet-25-mb-5490-mes
- ^ http://www.turktelekom.com.tr/tt/portal/Guncel/Detay/vdsl2
- ^ B. Lee, J. Cioffi; et al. (2007). "Gigabit DSL". IEEE Transactions on Communication. 55 (9): 1689–1692. doi:10.1109/TCOMM.2007.904374.
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