Companies Seek to Ensure DMT-VDSL Interoperability

Alcatel Micr'electronics, GlobespanVirata, Ikanos Communications, ST Micr'electronics and Zarlink Semiconductor have formed a Discrete Multi-Tone, Very-high-data rate Digital Subscriber Line (DMT-VDSL) initiative with the goal of producing interoperable DMT-based semiconductors that meet international standards for broadband VDSL. Noise and other line interference degrade signal integrity, impacting the speed and distance of VDSL transmission. DMT modulation overcomes this interference by configuring the transmitted signal in real time to match the line conditions. The result is higher quality, error-reduced communications at higher data rates over longer distances.

The DMT-VDSL initiative is committed to DMT as the line coding technology of choice for the delivery of more reliable, higher quality VDSL-based data, video and for its services to homes and organizations. The five companies are developing VDSL chipsets based on DMT modulation technology as adopted by the European Telecommunications Standards Institute and the American National Standards. These companies have agreed to achieve verifiable interoperability this year between their respective products, using the International Telecommunications Union's standard band plans at speeds up to 52 Mbps. Zarlink Semiconductor, Ontario, Canada, (613) 592-0200,

This article originally appeared in the 05/01/2002 issue of THE Journal.

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