本文件规定了超高速数字用户线（VDSL）的金属接口。本文件定义了VDSL功能要求和基于正交幅度调制（QAM）的收发器规范。这些项目包括双工方法、频谱频率计划、功率谱密度（PSD）屏蔽、操作和维护（OAM）以及业务分离器的电气特性。VDSL信号的传输介质为单双绞线，可同时支持普通旧电话业务（POTS）、声带数据业务和基本速率综合业务数字网（BR ISDN）业务。

This document specifies Metallic Interface of the Very-high-speed Digital Subscriber Lines (VDSL). The document defines the VDSL functional requirements and the transceiver specification based on Quadrature Amplitude Modulation (QAM). These items include the duplexing method, spectral frequency plan, power spectral density (PSD) mask, operation and maintenance (OAM) and electrical characteristics of the service splitter. The transport medium for VDSL signals is a single twisted pair that may simultaneously support Plain Old Telephone Service (POTS), voice-band data service and Basic Rate Integrated Service Digital Network (BR ISDN) service.