VDSL: Difference between revisions
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*[[CenturyLink]] provides Internet access over FTTN VDSL in [[Denver, Colorado]]; [[Boise, Idaho]]; [[Phoenix, Arizona]]; [[Seattle, Washington]]; [[Omaha, Nebraska]]; [[St. Paul, Minnesota]]; and the surrounding areas of these cities. In Seattle and |
*[[CenturyLink]] provides Internet access over FTTN VDSL in [[Denver, Colorado]]; [[Boise, Idaho]]; [[Phoenix, Arizona]]; [[Seattle, Washington]]; [[Omaha, Nebraska]]; [[St. Paul, Minnesota]]; and the surrounding areas of these cities. In Seattle, Denver, and St. Paul areas, Qwest's rate structure extends up to 40 Mbit/s downstream and 20 Mbit/s upstream, for around $80/month (December 2011). In Boise, Qwest offers 40, 20, or 12 Mbit/s downstream and 5 Mbit/s upstream over VDSL. Other locations are known to support up to 20 Mbit/s downstream. |
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*[[AT&T Inc.|AT&T]] provides Internet access and television service over VDSL in several regions under the trade-name [[U-verse]]. The AT&T service is based on FTTN; FTTP is also used. |
*[[AT&T Inc.|AT&T]] provides Internet access and television service over VDSL in several regions under the trade-name [[U-verse]]. The AT&T service is based on FTTN; FTTP is also used. |
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*[[Verizon]] offers its [[FiOS]] service in some metropolitan areas at speed of up to 300 Mbit/s. The Verizon service is based on [[FTTP]], and normally CAT5e Ethernet (or [[Multimedia over Coax Alliance|MoCA]] over coax) is used to deliver data service throughout the home. However, VDSL is used in [[Multi-family residential|MDU]]s when running CAT5e or coax to individual units is not practical. |
*[[Verizon]] offers its [[FiOS]] service in some metropolitan areas at speed of up to 300 Mbit/s. The Verizon service is based on [[FTTP]], and normally CAT5e Ethernet (or [[Multimedia over Coax Alliance|MoCA]] over coax) is used to deliver data service throughout the home. However, VDSL is used in [[Multi-family residential|MDU]]s when running CAT5e or coax to individual units is not practical. |
Revision as of 04:59, 10 January 2013
Very-high-bit-rate digital subscriber line (VDSL or VHDSL)[1] is a digital subscriber line (DSL) technology providing faster[vague] data transmission over a single flat untwisted or twisted pair of copper wires (up to 52 Mbit/s downstream and 16 Mbit/s upstream),[2] and on coaxial cable (up to 85 Mbit/s down- and upstream);[3] using the frequency band from 25 kHz to 12 MHz.[4] These rates mean that VDSL is capable of supporting applications such as high-definition television, as well as telephone services (voice over IP) and general Internet access, over a single connection. VDSL is deployed over existing wiring used for analog telephone service and lower-speed DSL connections. This standard was approved by ITU in November 2001.
Second-generation systems (VDSL2; ITU-T G.993.2 approved in February 2006) use frequencies 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.
Development
The concept of VDSL was first published in 1991 through a joint Bellcore-Stanford research study. The study searched for potential successors to the then-prevalent HDSL and relatively new ADSL, which were both 1.5 Mbit/s. Specifically, it explored the feasibility of symmetric and asymmetric data rates exceeding 10 Mbit/s on short phone lines.
This section needs expansion. You can help by adding to it. (January 2011) |
VDSL standards
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 quadrature amplitude modulation (QAM) and discrete multi-tone modulation (DMT). In 2006, ITU-T standardized VDSL in recommendation G.993.2 which specified only DMT modulation for VDSL2.
Version | Standard name | Common name | Downstream rate | Upstream rate | Approved in |
---|---|---|---|---|---|
VDSL | ITU G.993.1 | VDSL | 55 Mbit/s | 3Mbit/s | 2004-06-13 |
VDSL | ITU G.993.2 | VDSL2 | 100 Mbit/s | 100 Mbit/s | 2006-02-17 |
This section needs expansion. You can help by adding to it. (January 2011) |
Deployment
In 2006, the market was still small, except in Japan and South Korea. The third largest consumer market was Germany where VDSL is available in large parts of over 50 major cities and small parts of over 750 smaller cities and towns.
Africa
Mauritius |
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South-Africa |
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Asia
Hong Kong | |
India |
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Israel |
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Japan |
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Malaysia |
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Pakistan |
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South Korea | |
Taiwan |
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Thailand |
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Europe
Austria |
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Belgium |
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Czech Republic |
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Denmark | |
Finland | |
France |
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Germany |
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Greece |
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Hungary |
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Iceland |
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Ireland |
Note: Eircom began testing in March 2010, and expects roll out of services to the general public in September 2010.[21] |
Isle of Man |
Wi-Manx,*Sure:Cable and Wireless and Manx Telecom on the Isle of Man are now offering VDSL at max 40 Mb download and max 2 Mb upload speeds, up from the current 16Mb/800kb ADSL2 service. This is available to customers within 2 km of the exchange and will also be available to customers of the other Isle of Man based broadband suppliers. |
Monaco |
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Netherlands |
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Norway |
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Poland |
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Romania |
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Russia | |
Slovenia |
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Spain |
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Switzerland |
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Turkey |
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United Kingdom |
British Telecom and resellers:
Other providers:
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North America
Canada |
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United States |
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Oceania
Australia |
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New Zealand |
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South America
Argentina |
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Brazil |
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See also
References
- ^ "KPN starts VDSL trials". KPN.
- ^ "VDSL Speed". HowStuffWorks.
- ^ "Industrial VDSL Ethernet Extender Over Coaxial Cable, ED3331". EtherWAN.
- ^ "G.993.1 (06/04)". ITU.
- ^ "HGC homepage".
- ^ "MTNL homepage".
- ^ "Mumbai.mtnl.net.in homepage".
- ^ "VDSL Service Plan". ptnl.net.in.
- ^ "BSNL High Speed Plans". bsnl.co.in.
- ^ "?". bezeq.co.il. Retrieved 26 November.
{{cite web}}
: Check date values in:|accessdate=
(help) - ^ "VDSL Network S.B. homepage".
- ^ "Newsroom" (in German). unternehmen.telekom.at. Retrieved 26 November 2010.
- ^ De Poorter, Nicolas. "EDPnet geeft internetabonnementen serieuze boost". Retrieved 13 March 2012.
- ^ "Erenis.fr homepage".
- ^ "Vdsl2 arcep evaluation".
- ^ "Η εγκατάσταση οπτικών ινών καθυστερεί, ο ΟΤΕ επενδύει στο VDSL" (in Greek). in.gr. Retrieved 26 November 2010.
- ^ "Έναρξη παροχής υπερ-υψηλών ταχυτήτων Internet έως και 50Mbps μέσω της τεχνολογίας VDSL2 από τη Cyta!" (PDF) (in Greek).
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ignored (help) - ^ Tamás, Koi (September 8, 2008). "Csomagban kínált szolgáltatások, VDSL-internet és új ADSL-csomagok a Magyar Telekom új márkájának égisze alatt" (in Hungarian). hwsw.hu. Retrieved 26 November 2010.
- ^ "Siminn.is homepage".
- ^ Weckler, Adrian (4 November 2007). "Eircom to expand broadband speeds four-fold". The Sunday Business Post online. Retrieved 26 November 2010.
- ^ "?". siliconrepublic.com.[dead link]
- ^ "Telefónica lanza el Trío Futura VDSL e informa de la cobertura" (in Spanish). bandaancha.eu. Retrieved 26 November 2010.
- ^ "Telefónica lanza el Dúo Línea Internet 25 Mb por 54,90 € al mes". bandaancha.eu. Retrieved 26 November 2010.
- ^ "Bluewin TV homepage".
- ^ "Güncel". turktelekom.com.tr. Retrieved 26 November 2010.
- ^ "ttnet.com.tr homepage".
- ^ "TTNET homepage".
- ^ "Tellcom homepage".
- ^ "Biri homepage".
- ^ "Smile homepage".
- ^ "BT Superfast Broadband".
- ^ "Rutland Telecom".
- ^ "DigitalCityRegion homepage". Retrieved 26 November 2010.
- ^ "Digitally Transforming South Yorkshire". Retrieved 26 November 2010.
- ^ "BroadbandNext Update - ASX announcement" (PDF). asx.com.
- ^ "iiNet's VDSL webpage".
- ^ "IPLAN Argentina - Internet Optimo". iplan.com.ar.
Aware, Inc., VDSL2 White Paper, Rev 2
External links
- ITU-T Recommendation G.993.1: Very high speed digital subscriber line transceivers
- UK Broadband Usergroup
- ThinkBroadband
- The UNH-IOL DSL Knowledgebase (advanced tutorials)
- Motorola Broadband
- EFTel VDSL
- Vdsl Technology and company news
- VDSL2 chip vendor Metanoia communications Inc. Taiwan
- 'VDSL van KPN'
- RiPWiRE
- DRBSY Ltd
- IPLAN Networks Argentina
- VDSL2 by PTCL in Pakistan