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).The decision follows the release of data from the "VDSL Olympics," a series of performance tests conducted by Telcordia Technologies and BT...