| ITU-T News |
‘Triple Play’ of Video, Voice and Internet Services One Step Closer
ITU Standard Enables New ‘VDSL’ Playing Field for Telecom Network Operators |
30 April 2004, Geneva - ITU has reached agreement on a new global standard that enables telecom network operators to provide VDSL
(Very high-speed Digital Subscriber Line) technology. VDSL gives multi-megabit network access via ordinary telephone subscriber
lines, allowing operators to offer a 'triple play' of services - multiple high-quality digital video streams, high-speed internet
access and voice.
The standard - ITU-T Recommendation G.993.1 - specifies the application of the two main technologies used for encoding signals for
DSL - Discrete MultiTone (DMT) technology and Quadrature Amplitude Modulation (QAM) - to
VDSL.“Once network operators have implemented the new standard, customers will be able to view multiple TV programmes, access the
Internet, and talk on the phone - all at the same time, through one single phone line”, said Peter Wery, Chairman of ITU-T Study
Group 15.
“Future evolution of the VDSL standard, promising even higher bit rates and longer distances, will be based on the DMT technology
used for ADSL, thus establishing a single world-wide standard. This will allow the broadband telecom consumer to benefit from the
economies of scale offered by global volumes as well as the technological innovation driven by competition”, added
Wery.VDSL permits the transmission of asymmetric and symmetric data rates up to tens of Mbit/s. This will allow network operators to
offer fully integrated voice, video and high-speed Internet access to residential customers.
VDSL can be deployed from central offices or from optical fibre-fed cabinets located near customer premises. Actual bit rates
obtained will depend on the distance between the central office/cabinet and the customer premises and can be up to 50 Mbits
downstream, but will typically be closer to 23 Mbits and 4 Mbits upstream.
For further information:
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Mr Greg Jones
ITU-T Communications Coordinator
Tel: +41 22 730 5515
Email: greg.jones@itu.int
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Mr Richard Stuart
Rapporteur Q.4/15
Tel: +1 443 535 8825
Email: rlstuart@ieee.org
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Mr Andrew Nunn
Chairman WP 1/15
Tel: +44 1728 83 04 62
Email: andrew.nunn@btinternet.com
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Mr Peter Wery
Chairman Study Group 15
Tel: +1 613 828 5691
Email: wery@sympatico.ca
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