用于电视信号、声音信号和交互服务的有线网络 第201部分：IPTV 系统研究以及光纤广播服务的示例和应用

[中文适用范围]： 本部分IEC 60728描述了IPTV系统的技术背景和与音频、视频及多媒体系统设备相关的商业产品，旨在帮助有线电视运营商和客户理解当前包括应用、中间件、网络、设备和终端设备的IPTV系统。本文件旨在鼓励所有TA5专家开发与光纤广播网络上IPTV系统相关的新IS。本技术报告研究了主要标准开发组织（SDOs）开发的IPTV系统机制和已知的国家法规。本文件最后提出了对未来技术标准开发活动的观察和建议，特别是TC 100范围内的TA5。 本TR的目的是为有线电视运营商提供一种适当的方式，如何采用IPTV服务与当前的FTTH系统相结合，认识到光纤系统是有效传输4K和8K视频信号的最佳解决方案。本TR为有线电视运营商提供了当前IPTV系统的全面但基本信息；然而，由于文件大小的限制，省略了过多的详细信息。本文件的作者建议计划开发IPTV服务的有线电视运营商研究本文件中所示的原始国际标准。它还描述了从HFC到FTTH系统的迁移，以有效引入IPTV服务。 DOCSIS 4.0可以被视为在HFC上提供10Gbps服务的替代方式。如果带宽和其他限制（如无放大器等）被清除，本文件中描述的IPTV服务当然可以提供。 除了现有的国际标准和建议外，本文件还描述了一些支持IPTV服务的主要技术，如单播、多播、ABR（自适应比特率）和MPEG-DASH。还描述了4K和8K视频通过IP传输的实验，虚拟STB。 [外文原描述]： IEC TR 60728-201:2024 describes the technical background of IPTV systems and commercially available products related to audio, video and multimedia systems and equipment to enable cable operators and customers to understand current IPTV systems that include application, middleware, network, equipment and terminal devices. This document is to encourage all TA5 experts to develop new IS related to IPTV system over optical broadcast network. This Technical Report examines the mechanisms of IPTV systems developed by major standards development organizations (SDOs) and known national regulations. This document concludes with observations and recommendations for the potential future technical standards development activities especially for TA5 under the scope of TC 100. The purpose of this TR is to give cable operators an appropriate way how to adopt IPTV services with current FTTH system recognizing that optical system is the best solution for the effective transmission of 4K and 8K video signals. This TR gives an overall but essential information on current IPTV systems to cable operators; however, too much detailed information is omitted due to the limitation of document size. The author of this document recommends the cable operator who plans to develop IPTV services to study the original international standards shown in this document. It also describes a migration from the HFC to FTTH system for effective introduction to IPTV services. DOCSIS 4.0 can be considered on HFC as an alternative way to provide 10Gbps service. If bandwidth and other constraints (without Amp, etc.) are cleared, the IPTV service described in this document can of course be provided. In addition to present international standards and recommendations, this document describes some major technology supporting IPTV services such as unicast, multicast, ABR (Adapting Bit Rate) and MPEG-DASH. The experiment of 4K and 8K video transmission over IP, virtual STB are also described.