1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T J.297 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (11/2016) SERIES J: CABLE NETWORKS AND TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Cable set-top box Requirements and functional specificati
2、on of cable set-top box for 4K ultra high definition television Recommendation ITU-T J.297 Rec. ITU-T J.297 (11/2016) i Recommendation ITU-T J.297 Requirements and functional specification of cable set-top box for 4K ultra high definition television Summary Recommendation ITU-T J.297 specifies requi
3、rements and functional specification for 4K cable set-top box (STB) that enables 4K ultra high definition television (UHDTV) service reception over cable network and considers the compatibility and differences with the existing 2K cable STB. History Edition Recommendation Approval Study Group Unique
4、 ID* 1.0 ITU-T J.297 2016-11-06 9 11.1002/1000/13053 Keywords 4K ultra high definition television (UHDTV), set-top box (STB). * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/han
5、dle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T J.297 (11/2016) FOREWORD The 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 (
6、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 fou
7、r 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-Ts purview, the
8、 necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In 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. H
9、owever, 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 negat
10、ive 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
11、 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,
12、 ITU 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
13、.itu.int/ITU-T/ipr/. ITU 2017 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T J.297 (11/2016) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2
14、 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 3 5 Conventions 4 6 Overview . 4 6.1 4K cable system 4 6.2 Block diagram of 4K cable STB functions . 5 7 Requirements 6 7.1 QAM-based 4K linear video service 6 7.2 IP-based 4K linear video service 7 7.3 IP-VOD service 7 7.4 Backw
15、ard compatibility for 2K cable STB 9 8 Functional specifications 9 8.1 Specifications common to QAM-based and IP-based 4K cable STB for linear video service . 9 8.2 Specifications peculiar to QAM-based and IP-based 4K cable STB for linear video service . 11 8.3 Specifications of 4K IP-VOD STB 13 App
16、endix I Broadcasting standards (Region A) . 16 I.1 ETSI/DVB 16 I.2 IEC/CENELEC . 17 I.3 CENELEC 17 I.4 ISO/IEC 17 Appendix II Broadcasting standards (Region B) 18 II.1 ATSC 18 II.2 IEEE . 19 II.3 SCTE 19 Appendix III Broadcasting standards (Region C) . 20 III.1 Broadcasting related specifications fo
17、r Region C (see clause 8.2.1) . 20 III.2 Tuner (see clause 8.2.1.2) . 21 III.3 External interface (see clauses 8.1.5 and 8.3.5) . 22 III.4 Software management (see clause 8.2.1.5) 22 III.5 Content protection (see clause 8.1.4) . 22 III.6 Decoder for broadcasting type service (see clauses 8.1.1 and 8
18、.1.2) . 23 III.7 Forward error correction (see clause 8.2.2.1) . 23 Bibliography. 24 iv Rec. ITU-T J.297 (11/2016) Introduction 4K ultra high definition television (UHDTV) service provides better video quality than 2K high definition television (HDTV) service. It has been already deployed in a varie
19、ty of media markets such as movies, mobile communications and personal computers. Some first commercial products (e.g., TV sets with 4K screen) and 4K IP-VoD services already are emerging on the markets. On the other hand, a new video coding method which provides twice as much compression efficiency
20、 as AVC ITU-T H.264 was standardized as HEVC ITU-T H.265. Much higher quality video services are possible in the broadcasting field thanks to this technology. Under these circumstances, a 4K video service trial for the 2014 world cup was conducted in Brazil, and in 2015 a 4K video commercial service
21、 was started by satellite broadcasting, IPTV and cable networks. As a consequence it was expected that by the time of the next Olympic games in 2016 in Brazil, many cable customers had been enjoying higher-resolution television programmes at home by STB. Considering the rapid development of 4K UHDTV
22、 on the global market, this Recommendation, which focuses on the requirements and functional specifications for 4K UHDTV, was needed. The support of HEVC video decoding for 4K resolutions of the Internet protocol television (IPTV) terminal device are specified in ITU-T H.721. Rec. ITU-T J.297 (11/20
23、16) 1 Recommendation ITU-T J.297 Requirements and functional specification of cable set-top box for 4K ultra high definition television 1 Scope This Recommendation specifies the requirements and functional specification of cable set-top box (STB) for 4K ultra high definition television (UHDTV). 2 Re
24、ferences The 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; u
25、sers 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 Recomm
26、endation does not give it, as a standalone document, the status of a Recommendation. ITU-T H.222.0 Recommendation ITU-T H.222.0 (2014) | ISO/IEC 13818-1:2015, Information technology Generic coding of moving pictures and associated audio information Part 1: Systems. ITU-T H.262 Recommendation ITU-T H
27、.262 (2012) | ISO/IEC 13818-2: 2013, Information technology Generic coding of moving pictures and associated audio information Part 2: Video. ITU-T H.264 Recommendation ITU-T H.264 (2016) | ISO/IEC 14496-10 (2012), Information technology Coding of audio-visual objects Part 10: Advanced Video Coding.
28、 ITU-T H.265 Recommendation ITU-T H.265 (2015) | ISO/IEC 23008-2 (2013), High Efficiency Video Coding. ITU-T H.701 Recommendation ITU-T H.701 (2009), Content delivery error recovery for IPTV services. ITU-T H.721 Recommendation ITU-T H.721 (2015), IPTV terminal devices: Basic model. ITU-T H.750 Reco
29、mmendation ITU-T H.750 (2008), High-level specification of metadata for IPTV services. ITU-T J.83 Recommendation ITU-T J.83 (2007), Digital multi-programme systems for television, sound and data services for cable distribution. ITU-T J.122 Recommendation ITU-T J.122 (2007), Second-generation transmi
30、ssion systems for interactive cable television services IP cable modems. ITU-T J.222.1 Recommendation ITU-T J.222.1 (2007), Third-generation transmission systems for interactive cable television services IP cable modems: Physical layer specification. ITU-T J.222.2 Recommendation ITU-T J.222.2 (2007)
31、, Third-generation transmission systems for interactive cable television services IP cable modems: MAC and Upper Layer protocols. ITU-T J.288 Recommendation ITU-T J.288 (2016), Encapsulation of type-length-value (TLV) packet for cable transmission systems. 2 Rec. ITU-T J.297 (11/2016) ITU-T J.295 Re
32、commendation ITU-T J.295 (2012), Advanced cable set-top box requirement. ITU-T J.296 Recommendation ITU-T J.296 (2012), Specification for Hybrid Cable Set-Top Box. ITU-T J.1005 Recommendation ITU-T J.1005 (2015), Architecture and requirements of digital rights management (DRM) for cable television m
33、ultiscreen. ITU-T J.1006 Recommendation ITU-T J.1006 (2016), Specification of IP-VOD DRM for cable television multiscreen system in Multi-DRM environment. ITU-T Y.1910 Recommendation ITU-T Y.1910 (2008), IPTV functional architecture. ITU-R BT.709 Recommendation ITU-R BT.709 (2015), Parameter values
34、for the HDTV standards for production and international programme exchange. ITU-R BT.2020 Recommendation ITU-R BT.2020 (2015), Parameter values for ultra-high definition television systems for production and international programme exchange. ISO/IEC 14496-12 ISO/IEC 14496-12:2015, Information techno
35、logy Coding of audio-visual objects Part 12: ISO Base Media File Format. ISO/IEC 23001-7 ISO/IEC 23001-7:2016, Information technology MPEG systems technologies Part 7: Common encryption in ISO base media file format files. ISO/IEC 23008-1 ISO/IEC 23008-1:2014, Information technology High efficiency
36、coding and media delivery in heterogeneous environments Part 1: MPEG media transport. ISO/IEC 23009-1 ISO/IEC 23009-1:2014, Information technology Dynamic adaptive streaming over HTTP (DASH) Part 1: Media presentation description and segment formats. BBF TR069 Broadband Forum (2013), CPE WAN Managem
37、ent Protocol Version 1.4. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following term defined elsewhere: 3.1.1 ultra high definition television (UHDTV) ITU-R BT.2020: UHDTV provides viewers with an enhanced visual experience primarily by a wider field of view that covers a
38、considerable part of the human natural visual field with appropriate screen sizes relevant to usage at home and in public places. Signal formats contributing to increasing the compression efficiency are desirable for UHDTV systems as they have a larger number of pixels than HDTV systems. 3.2 Terms d
39、efined in this Recommendation This Recommendation defines the following terms: 3.2.1 4K UHDTV: supports 3,840 2,160 resolution and 60p frame frequency specified in ITU-R BT.2020. 3.2.2 RCU: The equipment used by users when they operate STB remotely. Rec. ITU-T J.297 (11/2016) 3 4 Abbreviations and a
40、cronyms This Recommendation uses the following abbreviations and acronyms: API Application Program Interface AVC Advanced Video Coding BS Broadcast Satellite television CAS Conditional Access System CDN Content delivery Network CENC Common Encryption CP Contents Provider DOCSIS Data Over Cable Servi
41、ce Interface Specifications DRM Digital Rights Management ECM Entitlement Control Message. EMM Entitlement Management Message FEC Forward Error Correction FTTH Fibre To The Home GUI Graphical User Interface HEVC High Efficiency Video Coding H/E cable television Head-End HFC Hybrid of Fibre-Coaxial H
42、DCP High-bandwidth Digital Content Protection system HDMI High-Definition Multimedia Interface HTML Hypertext Markup Language IPTV Internet Protocol Television IP Internet Protocol LAN Local Area Network MPEG Moving Picture Experts Group MMT MPEG Media Transport PON Passive Optical Network PSI Progr
43、am Specific Information QAM Quadrature Amplitude Modulation RCU Remote Control Unit RF Radio Frequency SI Service Information STB Set-Top Box TLV Type Length Value TS Transport Stream TTS Timestamped TS UHDTV Ultra High Definition Television UI User Interface 4 Rec. ITU-T J.297 (11/2016) VOD Video O
44、n Demand 5 Conventions The keywords “is required to“ indicate a requirement which must be strictly followed and from which no deviation is permitted if conformance to this document is to be claimed. The keywords “is recommended“ indicate a requirement which is recommended but which is not absolutely
45、 required. Thus this requirement need not be present to claim conformance. The keywords “is prohibited from“ indicate a requirement which must be strictly followed and from which no deviation is permitted if conformance to this document is to be claimed. The keywords “can optionally“ indicate an opt
46、ional requirement which is permissible, without implying any sense of being recommended. This term is not intended to imply that the vendors implementation must provide the option and the feature can be optionally enabled by the network operator/service provider. Rather, it means the vendor may opti
47、onally provide the feature and still claim conformance with the specification. In the body of this document and its annexes, the words shall, shall not, should and may sometimes appear, in which case they are to be interpreted, respectively as, is required to, is prohibited from, is recommended and
48、can optionally. The appearance of such phrases or keywords in an appendix or in material explicitly marked as informative are to be interpreted as having no normative intent. 6 Overview 6.1 4K cable system See Figure 6-1 as an example of 4K cable system. 4K cable content can be obtained from 4K prog
49、rams broadcasted by satellite stations. Cable operators may also capture 4K video content by themselves. In addition some providers offer 4K video. 4K video content encoded by HEVC ITU-T H.265 is transmitted over RF/QAM-based or IP-based systems through the cable network and received at 4K cable STB. 4K video content can be transmitted via existing HFC transport network which handles 64QAM and/or 256QAM as RF transmission. 4K video content can also be transmitted
