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ATIS' T1E1 Announces Specification
of DMT Line Coding in New VDSL American National Standard
Conclusion of "VDSL Olympics" Reached Following Analysis of Performance
Testing Conducted by Telcordia, BT
June 20, 2003, Washington, D.C. - The Alliance for Telecommunications
Industry Solutions (ATIS) announced that its Standards Committee T1 Technical
Subcommittee Working Group, T1E1.4, will specify only Discrete Multi-Tone (DMT)
line coding in its American National Standard (ANS) for Very-High-Bit-Rate Digital
Subscriber Line (VDSL). The DMT modulation method will be specified in the American
National Standard, and the Quadrature Amplitude Modulation (QAM) method will
be specified in a Committee T1 Technical Requirement (TRQ).
ATIS' Technical Subcommittee T1E1.4 made its decision after spearheading performance
testing on the two technologies - known within the industry as the "VDSL
Olympics." Telcordia Technologies and BT performed the testing and provided
test reports to Committee T1 in order to evaluate DMT and QAM's compatibility
with VDSL.
DMT VDSL supports data transmission speeds of up to 50 Mbps via existing copper
telephone wires, and will allow for simultaneous transmission of video, data
and voice. DMT is currently utilized for Asymmetric Digital Subscriber Line
(ADSL).
ATIS' T1E1 - the Interfaces, Power and Protection of Networks Technical Subcommittee
develops and recommends standards and technical reports related to power systems,
electrical and physical protection for the exchange and interexchange carrier
networks, and interfaces associated with user access to telecommunications networks.
About ATIS
ATIS is a technical planning and standards development organization that
is committed to rapidly developing and promoting technical and operations
standards
for the communications and related information technologies industry worldwide
using a pragmatic, flexible and open approach. Over 1,400 participants from
more than 400 communications companies are active in ATIS' 16 industry committees,
and its Incubator Solutions Program. www.atis.org
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