本文件与SCTE 168-4 2010相同，但可能已更新的信息性组件除外，如标题页、通知文本、页眉和页脚。本文件未作任何规范性修改。本推荐规程提供了一种通用方法，用于定义数字有线网络中影响端到端压缩多媒体（视频/音频/数据）质量的测量点和相关度量。未压缩内容和与“质量”无关的指标不包括在本推荐做法中， 有关IP网络的问题，请参见SCTE 168-7。

This document is identical to SCTE 168-4 2010 except for informative components which may have been updated such as the title page, NOTICE text, headers and footers. No normative changes have been made to this document.This Recommended Practice provides a common methodology for defining the measurement points and metrics of interest in digital cable networks that impair the compressed multimedia (video/audio/data) quality end to end. Uncompressed content and those metrics not related to "quality" are not included in this Recommended Practice, Issues related to the IP network are addressed in SCTE 168-7.