Intro for ITU and ITU-T

ITU-T 与 IEEE 协议规范ITU-T 的中文名称是国际电信联盟远程通信标准化组（ ITU-T for ITU Telecommunication Standardization Sector ）, 它是国际电信联盟管理下的专门制定远程通信相关国际标准的组织。

该机构创建于 1993年，前身是国际电报电话咨询委员会（CCITT是法语Comit e Consultatif International T el ephonique et T e egraphique 的缩写，英文是International Telegraph and Telephone Consultative Committee），总部设在瑞士日内瓦。

ITU-T 的各种建议的分类由一个首字母来代表，称为系列（见下文），每个系列的建议除了分类字母以外还有一个编号，比如说"V.90" 。

参见 Category:ITU-T 建议 . 重要的ITU-T 的系列和建议有：A - ITU-T 各部分工作的组织协调B - 语法规定 : 定义，符号，分类C - 常规通信统计D - 常规关税原则E - 总体网络操作，电话服务，服务操作和人的要素E.123 国家和国际电话号码规范E.163 国际电话服务号码分配计划E.164 国际公共远程通信号码分配计划补充 2 - 号码可移动性 F - 非电话远程通信服务G - 传输系统和媒体，数字系统和网络G.711 音频压缩（mu-law）G.722 音频压缩（宽带）G.722.1 音频压缩（宽带，低码率）G.722.2 语音压缩 AMR-WB （宽带，低码率）G.723.1 语音压缩 CELPG.726 音频压缩 ADPCM G.728 语音压缩 LD-CELP G.729 语音压缩 ACELPH - 视频音频以及多媒体系统复合方法 H. 223 低码率多媒体通信复合协议 H.225.0 也被称为实时传输协议 H.261 视频压缩标准 , 约 1991 年H.262视频压缩标准 （和MPEG-2第二部分内容相同 ）,约1994年H.263 视频压缩标准 , 约 1995 年H.263v2 （ 也就是 H.263+） 视频压缩标准 , 约 1998 年 H.264视频压缩标准（和MPEG-4第十部分内容相同）,约2003年 H.323 基于包传输的多媒体通信系统 附录 D - 基于 H.323 系统的实时传真附录 G - 文本传输和文本集 （Text conversation and Text SET ） 附录 J - H.323 附录 F 的安全性附录K - 基于HTTP 协议服务的H.323传输控制信道附录 M.1 - H.323 中的信令协议隧道 （Qsig ） 附录 M.2 - H.323 中的信令协议隧道 （Qsig ）H.324 低码率下的多媒体通信终端H.332 基于 H.323 拓展的宽松双向视频会议在高清编码 / 解码技术产生之前，视频会议数据是基于通用交换格式 编码的。

INTERNATIONAL TELECOMMUNICATION UNIONITU-T H.770(08/2009) TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITUSERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS IPTV multimedia services and applications for IPTV –IPTV service discovery up to consumptionMechanisms for service discovery and selection for IPTV servicesCAUTION !PREPUBLISHED RECOMMENDATIONThis prepublication is an unedited version of a recently approved Recommendation.It will be replaced by the published version after editing. Therefore, there will be differences between this prepublication and the published version.FOREWORDThe International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis.The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics.The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1.In some areas of information technology which fall within ITU-T's purview, the necessary standards are prepared on a collaborative basis with ISO and IEC.NOTEIn this Recommendation, the expression "Administration" is used for conciseness to indicate both a telecommunication administration and a recognized operating agency.Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words "shall" or some other obligatory language such as "must" and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party.INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process.As of the date of approval of this Recommendation, ITU [had/had not] received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http://www.itu.int/ITU-T/ipr/.ITU 2009All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU.ITU-T Rec. H.770 (ex H.IPTV-SDC)Mechanisms for service discovery and selection for IPTV servicesDraft new ITU-T Rec. H.770 (ex H.IPTV-SDC)Mechanisms for service discovery and selection for IPTV services SummaryH.770 describes the mechanisms for service provider discovery, service discovery and selection for IPTV services. The mechanisms enable IPTV terminal devices to provide the end-users with effective ways for consuming IPTV services. The expected types of IPTV services using service discovery information include linear TV and video-on-demand, etc.This Recommendation identifies service discovery metadata elements and attributes providing information concerning service providers and contents/services, and its delivery protocols covering both unicast and multicast transport mechanisms.KeywordsIPTV services, linear TV, service provider, service provider discovery, service provider information, service discovery, service discovery information, metadata, delivery protocolCONTENTS1 Scope (5)2 References (5)3 Definitions (6)3.1 Terms defined elsewhere: (6)3.2 Terms defined in this Recommendation: (8)4 Abbreviations and acronyms (8)5 Introduction (9)6 Service provider discovery process (11)7 Service provider information (13)7.1 Service provider information (13)7.2 Service role information (15)7.3 Encoding of service provider information (16)8 Service provider information delivery protocol(s) (16)9 Service discovery process (17)10 Detailed service offer information (17)10.1 Linear TV discovery (18)10.2 Package discovery record (22)10.3 Content guide discovery record (24)10.4 Service from other services providers record (25)10.5 Other services discovery record (25)10.6 Encoding of detailed service offer information (26)11 Detailed service offer information delivery protocol (26)12 Service selection process (27)Annex A Service discovery profile (29)Appendix I Multiple service platforms (30)I.1 Introduction of service role information (30)I.2 Multiple service platforms (31)I.3 Service mobility (32)Appendix II Requirements in other standard organizations (32)II.1 Service provider discovery information (33)II.2 Detailed service offer information (33)Appendix III The usage of TS with service discovery information (38)III.1 Study on the SI tables (38)III.2 Classification of TS with SI (40)III.3 Variation of the usage of service discovery information (41)Appendix IV Alternative methods for entry point handling (42)Bibliography (42)ITU-T Rec. H.770 (ex H.IPTV-SDC)Mechanisms for service discovery and selection for IPTV services1ScopeITU-T H.770 describes the mechanisms for service provider discovery, service discovery and selection for IPTV services. The mechanisms enable IPTV terminal devices to provide the end-users with effective ways to discover and select IPTV services. The expected types of IPTV services using service discovery information include linear TV and video-on-demand, etc.This Recommendation identifies service discovery metadata elements and attributes providing information concerning service providers and contents/services, and its delivery protocols covering both unicast and multicast transport mechanisms.2ReferencesThe following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. [ATIS-0800022] ATIS standard ATIS-0800022 (2008), IPTV Consumer Domain DeviceConfiguration Metadata[ETSI EN 300 468] ETSI EN 300 468 V1.8.1 (2007), Digital Video Broadcasting (DVB);Specification for Service Information (SI) in DVB systems[ETSI TS 101 154] ETSI TS 101 154 V1.8.1 (2007), Digital Video Broadcasting (DVB);Implementation guidelines for the use of Video and Audio Coding inBroadcasting Applications based on the (MPEG-2 Transport Stream) [ETSI TS 102 034] ETSI TS 102 034 V1.3.1 (2007), Digital Video Broadcasting (DVB);Transport of MPEG 2 TS Based DVB Services over IP Based Networks [ETSI TS 102 472] ETSI TS 102 472 V1.3.1 (2009), Digital Video Broadcasting (DVB); IPDatacast over DVB-H: Content Delivery Protocols[IETF RFC 768] IETF RFC 768 (1980), User Datagram Protocol (UDP)[IETF RFC 959] IETF RFC 959 (1985), File Transfer Protocol (FTP)[IETF RFC 2236] IETF RFC 2236 (1997), Internet Group Management Protocol, Version 2 [IETF RFC 2250] IETF RFC 2250 (1998), RTP Payload Format for MPEG1/MPEG2 Video [IETF RFC 2616] IETF RFC 2616 (1999), Hypertext Transfer Protocol -- HTTP/1.1[IETF RFC 2818] IETF RFC 2818 (2000), HTTP over TLS[IETF RFC 3376] IETF RFC 3376 (2002), Internet Group Management Protocol, Version 3 [IETF RFC 3550] IETF RFC 3550 (2003), RTP: A Transport Protocol for Real-TimeApplications[IETF RFC 3810] IETF RFC 3810 (2004), Multicast Listener Discovery Version 2 (MLDv2)for IPv6[ISO/IEC 23001] ISO/IEC 23001-1 (2006), Information technology - MPEG systemstechnologies - Part 1: Binary MPEG format for XML[ITU-T H.610] ITU-T Recommendation H.610 (2007), Full service VDSL - Systemarchitecture and customer premises equipment.[ITU-T H.701] ITU-T Recommendation H.701 (2009), Content Delivery Error Recovery for IPTV services[ITU-T H.721] ITU-T Recommendation H.721 (2009), IPTV Terminal Device, Basic Model [ITU-T H.750] ITU-T Recommendation H.750 (2008), High-level specification of metadata for IPTV services[ITU-T H.222.0] ITU-T Recommendation H.222.0 | ISO/IEC 13818-1 (2007), Informationtechnology – Generic coding of moving pictures and associated audioinformation: Systems[ITU-T X.891] ITU-T Recommendation X.891 (2005) | ISO/IEC 24824-1:2005, Information technology – Generic applications of ASN.1: Fast infoset[ITU-T Y.1910] ITU-T Recommendation Y.1910 (2008), IPTV functional architecture[W3C XML] World Wide Web Consortium (W3C) Recommendation XML1.1 (2004),Extensible mark-up language (XML) 1.0, Fifth Edition3Definitions3.1Terms defined elsewhere:3.1.1Application [ITU-T Y.101]: A functional implementation realized as software running in one or spread over several interplaying hardware entities.3.1.2Broadcast [ITU-T M.60]: One-way transmission of TV signals from one point to two or more other points3.1.3Content [ITU-T T.174]: Encoded generic value, media or non-media data3.1.4Electronic Content Guide (ECG) [ITU-T H.721]: A service navigation application used especially for streamed and downloaded content. ECG deals with metadata unlike SI used in terrestrial broadcasting.3.1.5Electronic Program Guide (EPG)[ITU-T J.90]: A service navigation interface which is used especially for programs.NOTE - in some traditional Broadcast Services, EPG is defined as an on-screen guide used to display information on scheduled live broadcast television programs, allowing a viewer to navigate, select, and discover programs by time, title, channel, genre. This traditional definition does not cover “catalogues” for on-demand and download services (sometimes called Electronic Content Guide (ECG), Broadband Content Guide (BCG)) and bi-directional interactive service (sometimes called Interactive Program Guide (IPG)) for end-user interaction with a server or head-end.3.1.6End-user [ITU-T Y.1910]: The actual user of the products or services.NOTE - The end-user consumes the product or service. An end-user can optionally be a subscriber.3.1.7EPG provider [ITU-T J.90]: The entity that collects collates and assembles the elements of information that constitute the EPG database.3.1.8Home network (HN) [ITU-T H.622]: Home network is the collection of elements that process, manage, transport, and store information, thus enabling the connection and integration of multiple computing, control, monitoring, communication and entertainment devices in the home.3.1.9IPTV[ITU-T Y.1901]: Multimedia services such as television, video, audio, text, graphics, data delivered over IP-based networks managed to support the required level of QoS/QoE, security, interactivity and reliability.3.1.10IPTV terminal device [ITU-T Y.1901]: A terminal device which has ITF functionality, e.g.a STB.3.1.11IPTV Terminal Function (ITF)[ITU-T Y.1901]: The functionality within the home network that is responsible for terminating the IP signal, and converting the content into a renderable [i.e. enabling to be seen and/or heard] format.3.1.12Linear TV[ITU-T Y.1901]: A television service in which a continuous stream flows in real time from the service provider to the terminal device and where the user cannot control the temporal order in which contents are viewed.3.1.13Metadata[ITU-T Y.1901]: Structured, encoded data that describe characteristics of information-bearing entities to aid in the identification, discovery, assessment, and management of the described entities.NOTE - EPG metadata has many applications and may vary in depth from merely identifying the content package title or information to populate an EPG to providing a complete index of different scenes in a movie or providing business rules detailing how the content package may be displayed, copied, or sold.3.1.14Multimedia [ITU-T J.148]: The combination of multiple forms of media such as audio, video, text, graphics, fax, and telephony in the communication of information.3.1.15Middleware[ITU-T Y.1901]: A layer of software between applications and resources, which consists of a set of service enablers that allow multiple functionalities running on one or more devices in an IPTV system to interact across a network3.1.16Network provider [ITU-T Y.1910]: The organization that maintains and operates the network components required for IPTV functionality.NOTE 1 - A network provider can optionally also act as service provider.NOTE 2 - Although considered as two separate entities, the service provider and the network provider can optionally be one organizational entity.3.1.17Package[ITU-T Y.1901]: A collection of content components that in some combination (either all or a subset) together provide an end-user experience and are intended to be used together. NOTE - A package can be instantiated with or without audio visual content depending on scenarios, in which audio visual content and package can be tightly associated or can be loosely coupled enough to be handled (generation, delivery, consumption) independently.3.1.18Portal [ITU-T H.721]: A portal presents information from diverse sources in a unified manner and provides a way to attach the communication services.3.1.19Program Specific Information (PSI) [ITU-T H.220.0]: PSI consists of normative data which is necessary for the demultiplexing of Transport Streams and the successful regeneration of programs and is described in 2.4.4 of [ITU-T H.220.0]. An example of privately defined PSI data is the non-mandatory network information table.3.1.20SCP[ITU Y.1901]: A combination of service protection and content protection3.1.21Service [ITU-T Y.101]: A structure set of capabilities intended to support applications.3.1.22Service Information (SI) [ETSI EN 300 468]: Digital data describing the delivery system, content and scheduling/timing of broadcast data streams, etc.NOTE - It includes MPEG-2 PSI together with independently defined extensions.3.1.23Service navigation[ITU-T H.720]: The presentation of information that allows the end-user to discover, select and consume services.3.1.24Service provider [ITU-T M.1400]: A general reference to an operator that provides telecommunication services to customers and other users either on a tariff or contract basis. A service provider may or may not operate a network. A service provider may or may not be a customer of another service provider.3.1.25Set-top box (STB)[ITU-T J.183]: A device that contains demodulator, de-multiplexer, decoder, other functionalities and interfaces related to signal reception and presentation of the distributed programme at the subscriber's site.3.1.26Stream [ITU-T J.200]: A unidirectional continuous flow of content.3.1.27Subscriber [ITU-T M.3050.1]: The subscriber is responsible for concluding contracts for the services subscribed to and for paying for these services.3.1.28Telecommunication service [ITU-T F.700]: Set of telecommunication capabilities that work in a complementary and cooperative way in order to let users perform applications.3.1.29Terminal device (TD)[ITU-T Y.1901]: An end-user device which typically presents and/or processes the content, such as a personal computer, a computer peripheral, a mobile device, a TV set, a monitor, a VoIP Terminal or an audio-visual media player.3.1.30User device [ATIS-0800002]: Also known as Home Network End-Device (HNED), Home Network Device (HND), Consumer Equipment (CE), terminal and physical device. A piece of hardware equipment running its software and attached to a Home Network and being identified by a GUID, e.g. a MAC address. A single Device can be used by one or more3.1.31Video on demand (VoD)[ITU-T Y.1901]: A service in which the end-user can , on demand, select and view a video content and where the end-user can control the temporal order in which the video content is viewed (e.g. the ability to start the viewing, pause, fast forward, rewind, etc).NOTE - The viewing may occur some time after the selection of the video content.3.2Terms defined in this Recommendation:3.2.1 SCP provider: A service provider that offers SCP functionalities to the other service providers.3.2.2 Service platform: A set of functions that facilitate telecommunication services provided by service providers.NOTE - In the context of IPTV services, examples of service platform functions are service authentication, content aggregation and content delivery.4Abbreviations and acronymsThis Recommendation uses the following abbreviations and acronyms.AV Audio videoASN.1 Abstract Syntax Notation OneBiM Binary MPEG format for XMLBCG Broadband content guideCAS Conditional access systemDRM Digital rights managementDVBSTP DVB SD&S transport protocolECG Electronic content guideEPG Electronic program guideFQDN Fully qualified domain nameHN Home networkHNED Home network end-deviceHTML Hyper text mark-up languageHTTP Hyper text transport protocolID IdentifierIGMP Internet group management protocolIP Internet protocolIPG Interactive program guideMAC Media access controlMLD Multicast listener discoveryMPEG Moving picture experts groupPER Packed Encoding RulesPSI Program specific informationPSIP Program and system information protocolSADS Service and application discovery and selectionSCP Service and content protectionSI Service informationSOAP Simple object access protocolSP Service providerTS Transport streamUDP User datagram protocolURI Uniform resource indicatorURL Uniform resource locatorVOD Video on demandXML Extensible mark-up language5IntroductionService discovery includes a number of steps toward content acquisition as illustrated in Figure 5-1. The acquisition of the entry point data to start the service discovery process, which is assumed to be architecture-specific, is not part of this Recommendation.a number ofSP a number ofservices(Linear TV,VoD, etc)a number ofcontentson Linear TVor VoDNotes for Figure 5-1:-SP discovery: Discovery of the service providers available on the network.-SP service discovery: Discovery of the services offered by a specific or all service providers.-SP content discovery: Discovery of the individual services or contents from a specific service provider.-Content selection & acquisition: At the end of the navigation through the offered services and contents, the end-user selects a service or content and acquires it. This step is not part of this Recommendation.-End-users and/or devices may be authenticated before service provider attachment or service attachment as part of the security provisions [b_ATIS-0800017].Figure 5-1: From service provider discovery to content acquisition Respective IPTV architecture has its own way to make the starting entry point(s) available to the IPTV terminal device.A starting entry point might be:-An IPTV service provider description provider entry point (when there are several IPTV service providers on the network and no specific service provider entry point is provided in the IPTV terminal device configuration data)NOTE - IPTV service provider descriptor provider is an organization providing service providerinformation.-An IPTV service provider entry point (when there is only one IPTV service provider on the network or when a specific service provider entry point is provided in the IPTV terminal device configuration data). The IPTV service provider may be running a web-based solution, ametadata-based solution or both of them.-One of the following:∙Multicast address for delivering the entry point information described above∙Location of service and application discovery and selection (SADS) functions (i.e., FQDN or unicast IP address). SADS functional block provides for the discovery and selection ofIPTV services and applications [ITU-T Y.1910].The descriptions of the different steps for service discovery are described below. These are independently of any specific IPTV architecture.Scope of this RecommendationFigure 5-2: From entry point data to service/content acquisitionNOTE - Details of each record are explained in clauses 7 and 10.There are several solutions for the IPTV terminal device to obtain the "entry point data" but this is part of network signalling and therefore not included here.The Figure 5-2 indicates the boundary between what is out and in the scope of this Recommendation.In addition, exchange of service discovery information between the SADS functional block and IPTV terminal devices can be performed in push mode or pull mode [ITU-T Y.1910] or a mix of both as follows:-Push mode: the SADS functional block actively sends the service and application discovery information to the IPTV terminal devices.-Pull mode: the IPTV terminal devices repeatedly request the service and application discovery information from the SADS functional block.6Service provider discovery processThe first step is to discover the IPTV service providers.In the case where there is only one IPTV service provider or if the user is directly registered with one particular service provider, this first step is simpler.In the case where there are several service providers and there is no preconfigured service provider, it is necessary to provide the end-user device with one or more starting entry point(s) from where to obtain the description of the service providers available on the network and there are different solutions depending on the IPTV architecture to obtain these entry points.Figure 6-1: Service provider discovery with a central IPTV service provider descriptionproviderNOTE - IPTV service description provider is an organizations providing information about IPTV services (e.g. EPG provider).In the previous configuration, there is one entry point which allows acquiring information about available service providers; this is the "IPTV Service Provider Description Provider" entry point. An alternative solution without a central "IPTV Service Provider Description Provider" is also possible as described in Figure 6-2.Figure 6-2: Service provider discovery without a central service provider description provider7Service provider information7.1Service provider informationThis section specifies the first level of information about service providers.The information related to a service provider is called a "Service Provider Information" record. The service provider information record contains the first level description of a service provider. Several service provider information records can be grouped together if there are several service providers to be described.Table 7.1-1 lists the elements/attributes identified for the service provider information record: Mandatory elements and attributes are shown as “M”, optional ones are shown as “O”, conditional requirements are shown as “C”.Table 7.1-1: Service provider information recordThe elements/attributes described in Table 7.1-2 have been identified to be part of the “Individual Service Provider Information”.Table 7.1-2: Individual service provider information elements/attributesThe elements/attributes described in Table 7.1-3 have been identified to be part of the “Service Offer Summary”.Table 7.1-3: Service offer summary elements/attributesNOTE 1 - At least one of them are required to be presented.NOTE 2 - Segments are small divided units of …Detailed Service Offer‟ information records. The service discovery information records may be of a substantial size, but only parts of them are needed by an IPTV terminal device at any one time. Also, changes to the records may be localized to part of the records. Segments are defined in the context of a single record type of service discovery information in Table 7.1-4 [ETSI TS 102 034].Classification of metadata records are specified by using “Record Type”. Table 7.1-4 lists the record types a service provider may offer.Table 7.1-4: Details of Record TypeNOTE - “Other services discovery” entries are not limited to those listed in this table.Figure 7-1 contains a graphical representation of an implementation example of the service provider information records.Figure 7-1: Graphical representation of the service provider information record Relevant standards are:-Clause 5.2.5 of [ETSI TS 102 034] specifies the Service Provider Discovery information.-Clause 8 of [ATIS 0800022] also specifies the Service Provider Discovery information.7.2Service role informationA single organization may play various roles. Supplementary elements may be appended to service provider information or to other elements for identifying these roles and for finding service groupings.Service role information is necessary for cases such as the following:1)When a network provider and a service provider are separate organizational entities as shown inFigure 6-1 of [ITU-T Y.1910];2)When SCP functions [ITU-T Y.1910] are provided by an entity other than the service provideror the network provider.While Appendix I shows possible examples using such service role information, the details of service role information are for further study.7.3Encoding of service provider informationFormat and encoding of service provider information record in this clause are:-Service provider information is encoded in XML [W3C XML].-Service provider information can optionally be compressed by using Fast Infoset [ITU-T X.891], ZLIB including GZIP format [ETSI TS 102 472] or BiM [ISO/IEC 23001].8Service provider information delivery protocol(s)The recommended transport mechanisms for the delivery of the descriptions of IPTV service providers over IP are as follows:-HTTP version 1.1 [IETF RFC 2616] for "Service Provider Information" delivery over unicast (pull mode)-HTTP over TLS [IETF RFC 2818] for "Service Provider Information" delivery over unicast with secure manner (pull mode)-IGMP version 2 [IETF RFC 2236] for "Service Provider Information" delivery over IPv4 multicast (push mode)-IGMP version 3 [IETF RFC 3376] for "Service Provider Information" delivery over IPv4 multicast (push mode)-MLD version 2 [IETF RFC 3810] for "Service Provider Information" delivery over IPv6 multicast (push mode)-FLUTE [ETSI TS 102 472] for "Service Provider Information" delivery over IPv4/IPv6 multicast (“push mode”)-DVBSTP [ETSI TS 102 034]: a light protocol specified by DVB, used for delivery over multicast (push mode)Figure 8-1: Unicast request to get the description of the available IPTV service providers In the case of Figure 8-1, the service provider description provider may answer with a set of metadata containing the description of the available service providers.。

各位同事：大家好！
今年9月在ITU-T SG15 全会上刚刚通过了修订G.654和G.657两个标准，现在正在出版中，下面将两个标准修订的主要情况向各位通报，以便各位在工程设计中编写选用产品技术要求时应用。

修订的G.654最新版本的为V9.0版本，最新版本增加了“G.654D”子类光纤，它是G.654光纤中在1550nm波长的最大衰减系数限值为最小的光纤，详细参数见下表：
G.654.D
G.654.D
一是G.657B的几何结构参数与G.657A统一了、二是对原来“侍研究”的色散系数和PMD参数己经给出、三是衰减系数作了修改并与G.657A相一致，使G.657各子类光纤都能与G.652光纤相匹配，详细参数见下表：
G.657 A
G.657 B
谢桂月2012年11月6日。

ITU-T与IEEE协议规范ITU-T的中文名称是国际电信联盟远程通信标准化组(ITU-T for ITU Telecommunication Standardization Sector), 它是国际电信联盟管理下的专门制定远程通信相关国际标准的组织。

该机构创建于1993年，前身是国际电报电话咨询委员会(CCITT 是法语ComitéConsultatif International Téléphonique et Télégraphique的缩写, 英文是International Telegraph and Telephone Consultative Committee)，总部设在瑞士日内瓦。

ITU-T的各种建议的分类由一个首字母来代表，称为系列(见下文)，每个系列的建议除了分类字母以外还有一个编号，比如说"V.90"。

参见Category:ITU-T建议.重要的ITU-T的系列和建议有：A - ITU-T 各部分工作的组织协调B - 语法规定 : 定义, 符号, 分类C - 常规通信统计D - 常规关税原则E - 总体网络操作，电话服务，服务操作和人的要素E.123 国家和国际电话号码规范E.163 国际电话服务号码分配计划E.164 国际公共远程通信号码分配计划补充 2 - 号码可移动性F - 非电话远程通信服务G - 传输系统和媒体，数字系统和网络G.711 音频压缩 (mu-law)G.722 音频压缩 (宽带)G.722.1 音频压缩 (宽带, 低码率)G.722.2 语音压缩 AMR-WB (宽带, 低码率)G.723.1 语音压缩 CELPG.726 音频压缩 ADPCMG.728 语音压缩 LD-CELPG.729 语音压缩 ACELPH - 视频音频以及多媒体系统复合方法H.223 低码率多媒体通信复合协议H.225.0 也被称为实时传输协议H.261 视频压缩标准, 约1991年H.262 视频压缩标准(和MPEG-2第二部分内容相同), 约1994年H.263 视频压缩标准, 约1995年H.263v2 (也就是 H.263+) 视频压缩标准, 约1998年H.264 视频压缩标准(和MPEG-4第十部分内容相同), 约2003年H.323 基于包传输的多媒体通信系统附录 D - 基于H.323系统的实时传真附录 G - 文本传输和文本集(Text conversation and Text SET)附录 J - H.323 附录 F 的安全性附录 K - 基于HTTP协议服务的H.323传输控制信道附录 M.1 - H.323中的信令协议隧道 (Qsig)附录 M.2 - H.323中的信令协议隧道 (Qsig)H.324 低码率下的多媒体通信终端H.332 基于H.323拓展的宽松双向视频会议在高清编码/解码技术产生之前，视频会议数据是基于通用交换格式 (CIF) 进行编码的。

ITU-T是国际电信联盟电信标准化部门，致力于制定全球通信和信息技术的国际标准。

2023年8月份和9月份，ITU-T发布了一系列标准，涉及到通信技术、网络安全、互联网服务等多个领域。

下面将就ITU-T 2023年8月份和9月份发布的标准进行详细介绍。

一、ITU-T 2023年8月份发布的标准1. 通信技术标准ITU-T在8月份发布了针对5G通信技术的标准，包括5G网络架构、接口规范、频谱利用等方面的标准化内容。

这些标准的发布将进一步推动5G技术的全球应用和发展，并为各国和地区提供统一的技术规范，促进5G产业的健康发展。

2. 网络安全标准针对网络安全领域，ITU-T发布了一系列网络安全标准，包括身份验证、加密通信、网络攻击防范等方面的标准化内容。

这些标准的发布将有助于加强全球通信网络的安全性，提升网络安全保障水平，保护用户隐私和信息安全。

3. 互联网服务标准ITU-T还发布了针对互联网服务的标准，包括互联网数据传输、互联网协议、互联网接入等方面的标准化内容。

这些标准的发布将有助于优化互联网服务质量，提升互联网传输效率，满足用户对高速、稳定互联网服务的需求。

二、ITU-T 2023年9月份发布的标准1. 人工智能标准ITU-T发布了一系列关于人工智能的标准，涉及到人工智能算法、人工智能应用、人工智能伦理等方面的标准化内容。

这些标准的发布将有助于规范人工智能技术的发展和应用，保障人工智能技术的合理和安全使用，促进人工智能的可持续发展。

2. 物联网标准针对物联网领域，ITU-T发布了一系列物联网标准，包括物联网协议、物联网设备互通、物联网数据安全等方面的标准化内容。

这些标准的发布将有助于推动物联网技术的普及和应用，提升物联网设备和服务的互操作性和安全性。

3. 大数据标准ITU-T还发布了针对大数据领域的标准，涉及到大数据存储、大数据分析、大数据隐私保护等方面的标准化内容。

这些标准的发布将有助于规范大数据技术的应用和管理，促进大数据产业的健康发展，保护大数据隐私和安全。

itu t标准ITU-T标准。

ITU-T标准是国际电信联盟电信标准化部门（ITU-T）制定的一系列国际标准，旨在推动全球电信和信息通信技术的发展，促进各国之间的互联互通。

ITU-T标准涵盖了各种电信和信息通信领域，包括网络架构、传输协议、数字信号处理、多媒体通信等，对于保障全球通信设施的互操作性和互联互通至关重要。

ITU-T标准的制定是由ITU-T成员国和产业界共同参与的国际合作过程，旨在确保各国通信设施的互联互通和互操作性。

ITU-T 标准的制定过程经过了严格的技术评审和国际协商，确保了标准的科学性、合理性和公正性。

ITU-T标准的制定不仅考虑了技术的先进性和可行性，还充分考虑了各国的实际需求和利益，促进了全球通信设施的共同发展。

ITU-T标准在全球范围内得到了广泛的认可和应用，成为了全球通信设施的重要基础。

ITU-T标准的实施促进了各国通信设施的互联互通和互操作性，为全球通信业的发展提供了有力支持。

ITU-T 标准的不断更新和完善，也为全球通信设施的创新和发展提供了有力保障。

ITU-T标准的制定和实施，对于推动全球通信设施的互联互通和互操作性具有重要意义。

ITU-T标准的科学性、合理性和公正性，保障了全球通信设施的互联互通和互操作性，促进了全球通信设施的共同发展。

ITU-T标准的不断更新和完善，也为全球通信设施的创新和发展提供了有力保障，推动了全球通信业的繁荣和发展。

总的来说，ITU-T标准的制定和实施，对于推动全球通信设施的互联互通和互操作性具有重要意义。

ITU-T标准的科学性、合理性和公正性，保障了全球通信设施的互联互通和互操作性，促进了全球通信设施的共同发展。

ITU-T标准的不断更新和完善，也为全球通信设施的创新和发展提供了有力保障，推动了全球通信业的繁荣和发展。

中文名称：国际电信联盟英文名称：International Telecommunications Union(ITU)ITU定义：联合国于1865年成立的制定国际电信标准的专门机构。

部组织机构：无线电通信部门(ITU-R)电信标准化部门(ITU-T)电信发展部门(ITU-D)ITU-T官网http://www.itu.int/ITU-T/index.htmlITU-T标准下载http://www.itu.int/rec/T-REC/e中文名称：互联网工程任务组英文名称: Internet Engineering Task Force(IETF)IETF定义：成立于1985年底，是全球互联网最具权威的技术标准化组织，主要任务是负责互联网相关技术规范的研发和制定，当前绝大多数国际互联网技术标准出自IETF。

组织机构:互联网工程指导小组IESG(Internet Engineering Steering Group)因特网结构委员会IAB(Internet Architecture Board)国际互联网协会ISOC(Internet Society)互联网数字分配机构IANA(The Internet Assigned Numbers Authority) IETF官网。

/下载官方RFC的地方/rfc.html/中文名称：国际标准化组织英文名称: International Organization for Standardization(ISO)ISO定义：1947年2月23日，国际标准化组织正式成立。

是世界上最大的非政府性标准化专门机构，是国际标准化领域中一个十分重要的组织。

组织机构:合格评定委员会（CASCO）消费者政策委员会（COPOLCO）发展中国家事务委员会（DEVCO）信息系统和服务委员会（INFCO）特别咨询小组 ISO的组织结构技术管理局技术委员会TC理事会中央秘书处ISO全体大会合格评定委员会（CASCO）消费者政策委员会（COPOLCO）发展中国家事务委员会（DEVCO）信息系统和服务委员会（INFCO）ISO官网/iso/home.htmISO标准下载(要钱的)/iso/iso_catalogue.htm中文名称：美国电气和电子工程师协会英文名称: Institute of Electrical and Electronics Engineers (IEEE)IEEE定义：IEEE（美国电气电子工程师学会）于1963年1月1日由AIEE（美国电气工程师学会）和IRE（美国无线电工程师学会）合并而成，是美国规模最大的专业学会。

ITU-T与IEEE协议规范ITU-T的中文名称是国际电信联盟远程通信标准化组(ITU-T for ITU Telecommunication Standardization Sector), 它是国际电信联盟管理下的专门制定远程通信相关国际标准的组织。

该机构创建于1993年，前身是国际电报电话咨询委员会(CCITT 是法语Comité Consultatif International Téléphonique et Télégraphique的缩写, 英文是International Telegraph and Telephone Consultative Committee)，总部设在瑞士日内瓦。

ITU-T的各种建议的分类由一个首字母来代表，称为系列(见下文)，每个系列的建议除了分类字母以外还有一个编号，比如说"V.90"。

参见Category:ITU-T建议.重要的ITU-T的系列和建议有：A - ITU-T 各部分工作的组织协调B - 语法规定 : 定义, 符号, 分类C - 常规通信统计D - 常规关税原则E - 总体网络操作，电话服务，服务操作和人的要素E.123 国家和国际电话号码规范E.163 国际电话服务号码分配计划E.164 国际公共远程通信号码分配计划补充 2 - 号码可移动性F - 非电话远程通信服务G - 传输系统和媒体，数字系统和网络G.711 音频压缩 (mu-law)G.722 音频压缩 (宽带)G.722.1 音频压缩 (宽带, 低码率)G.722.2 语音压缩 AMR-WB (宽带, 低码率)G.723.1 语音压缩 CELPG.726 音频压缩 ADPCMG.728 语音压缩 LD-CELPG.729 语音压缩 ACELPH - 视频音频以及多媒体系统复合方法H.223 低码率多媒体通信复合协议H.225.0 也被称为实时传输协议H.261 视频压缩标准, 约1991年H.262 视频压缩标准(和MPEG-2第二部分内容相同), 约1994年H.263 视频压缩标准, 约1995年H.263v2 (也就是 H.263+) 视频压缩标准, 约1998年H.264 视频压缩标准(和MPEG-4第十部分内容相同), 约2003年H.323 基于包传输的多媒体通信系统附录 D - 基于H.323系统的实时传真附录 G - 文本传输和文本集(Text conversation and Text SET)附录 J - H.323 附录 F 的安全性附录 K - 基于HTTP协议服务的H.323传输控制信道附录 M.1 - H.323中的信令协议隧道 (Qsig)附录 M.2 - H.323中的信令协议隧道 (Qsig)H.324 低码率下的多媒体通信终端H.332 基于H.323拓展的宽松双向视频会议在高清编码/解码技术产生之前，视频会议数据是基于通用交换格式 (CIF) 进行编码的。

ITU-T与IEEE协议规范ITU-T的中文名称是国际电信联盟远程通信标准化组(ITU-T for ITU Telecommunication Standardization Sector), 它是国际电信联盟管理下的专门制定远程通信相关国际标准的组织。

该机构创建于1993年，前身是国际电报电话咨询委员会(CCITT 是法语ComitéConsultatif International Téléphonique et Télégraphique的缩写, 英文是International Telegraph and Telephone Consultative Committee)，总部设在瑞士日内瓦。

ITU-T的各种建议的分类由一个首字母来代表，称为系列(见下文)，每个系列的建议除了分类字母以外还有一个编号，比如说"V.90"。

参见Category:ITU-T建议.重要的ITU-T的系列和建议有：A - ITU-T 各部分工作的组织协调B - 语法规定 : 定义, 符号, 分类C - 常规通信统计D - 常规关税原则E - 总体网络操作，电话服务，服务操作和人的要素E.123 国家和国际电话号码规范E.163 国际电话服务号码分配计划E.164 国际公共远程通信号码分配计划补充 2 - 号码可移动性F - 非电话远程通信服务G - 传输系统和媒体，数字系统和网络G.711 音频压缩 (mu-law)G.722 音频压缩 (宽带)G.722.1 音频压缩 (宽带, 低码率)G.722.2 语音压缩 AMR-WB (宽带, 低码率)G.723.1 语音压缩 CELPG.726 音频压缩 ADPCMG.728 语音压缩 LD-CELPG.729 语音压缩 ACELPH - 视频音频以及多媒体系统复合方法H.223 低码率多媒体通信复合协议H.225.0 也被称为实时传输协议H.261 视频压缩标准, 约1991年H.262 视频压缩标准(和MPEG-2第二部分内容相同), 约1994年H.263 视频压缩标准, 约1995年H.263v2 (也就是 H.263+) 视频压缩标准, 约1998年H.264 视频压缩标准(和MPEG-4第十部分内容相同), 约2003年H.323 基于包传输的多媒体通信系统附录 D - 基于H.323系统的实时传真附录 G - 文本传输和文本集(Text conversation and Text SET)附录 J - H.323 附录 F 的安全性附录 K - 基于HTTP协议服务的H.323传输控制信道附录 M.1 - H.323中的信令协议隧道 (Qsig)附录 M.2 - H.323中的信令协议隧道 (Qsig)H.324 低码率下的多媒体通信终端H.332 基于H.323拓展的宽松双向视频会议在高清编码/解码技术产生之前，视频会议数据是基于通用交换格式 (CIF) 进行编码的。