本推荐实施规程旨在提供有关在IP传输网络中检测错误的指导，该网络用于传输媒体服务，包括视频和音频数据流以及相关控制信息，以通过IP网络提供MPEG传输。IP传输层与其他应用程序层和物理组件层一起运行，这些应用程序层和物理组件层也可能产生网络损伤，本文档将重点介绍这些损伤对检测媒体服务交付中问题原因的影响。常见的IP网络事件和故障以其对正常运行系统中的MPEG传输流的影响为特征。每个网络布局都是不同的，并呈现出独特的配置挑战；本文件不提供网络配置指南，但提供了IP网络各个组件的背景信息，以及IP传输网络如何在多媒体网络中运行。 本文档描述了IP网络内的协议以及媒体损坏的可能IP层原因，但未提供将特定IP故障与媒体损坏关联起来的指标。提供了业界公认的IP数据包丢失、延迟和抖动指标。IP网络层的背景为计划部署或目前正在部署MMM系统的运营商提供指导，并在适当情况下，参考其他SCTE文件，这些文件提供了有关IP传输网络之外其他网络组件的补充信息。

This Recommended Practice is to give guidance about detecting errors in the IP Transport network used for the delivery of media services including Video and Audio streams of data with the associated control information to provide MPEG transport through an IP network. The IP Transport Layer operates in conjunction with other Application and Physical component layers that could also generate network impairments, this document will focus on the effect these impairments have on the detection of the cause of problems in the delivery of media services. Common IP network events and failures are characterized with their impact on the MPEG transport stream in a functioning system. Every network layout is different and presents unique configuration challenges; this document does not provide guidance on configuration of the network but does provide background information on the individual components of the IP network as well how the IP transport network operates in a multimedia network.This document describes the protocols within the IP network and the possible IP layer causes of media impairments but does not provide metrics that correlate specific IP failures to media impairments. Industry accepted metrics have been provided for IP packet loss, delay and jitter.This background on the IP network layer provides guidance to operators who are planning to deploy or are currently deploying MMM systems and, where appropriate, refers to other SCTE documents that provide supplemental information about other network components outside of the IP Transport Network.