The IEEE’s 802.3ah Ethernet in the First Mile (EFM) Task Force selected DMT as its worldwide line-coding standard for VDSL. The selection of DMT by both the IEEE and the T1E1.4 Working Group (see below) paves the way for carriers to expand their deployments of VDSL. Ikanos Communications said that since its VDSL-DMT chipsets became available in Q4 of 2002, it has shipped more than 500,000 ports.
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- Last week, the T1E1.4 committee, which is part of The Alliance for Telecommunications Industry Solutions (ATIS), decided to specify only Discrete Multi-Tone (DMT) line coding in its American National Standard (ANS) for 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).
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The decision follows the release of data from the “VDSL Olympics,” a series of performance tests conducted by Telcordia Technologies and BT.