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.183 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (03/2016) SERIES J: CABLE NETWORKS AND TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Digital transmission of television signals Part 1 Time-di
2、vision multiplexing of multiple MPEG-2 transport streams and generic formats of transport streams over cable television systems Recommendation ITU-T J.183 Rec. ITU-T J.183 (03/2016) i Recommendation ITU-T J.183 Time-division multiplexing of multiple MPEG-2 transport streams and generic formats of tr
3、ansport streams over cable television systems Summary Recommendation ITU-T J.183 describes a time-division multiplexing (TDM) format for transmitting multiple Motion Picture Experts Group version 2 (MPEG-2) transport streams (TSs) or generic formats of TSs by using a simple implementation of an MPEG
4、-2 systems physical interface on cable television systems. The TDM frame encapsulates the MPEG-2 TSs or generic formats of TSs, which are packetized into 188-byte length prior to transmission. It also describes the framing structure for high-speed transmission by channel-bonding technology. The form
5、at features interoperability with the existing satellite transmodulation format, which is based on the specification in Annex C of ITU-T J.83 and Annex C of ITU-T J.84 (satellite master antenna television (SMATV) system C (III). It may also be applicable to other transmission systems. When this form
6、at is introduced into existing digital cable television systems, it is recommended that information about the frame format be transmitted by the network information table simultaneously. It is necessary for the set-top box to identify the digital channel containing multiple MPEG-2 TSs or generic for
7、mats of TSs. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T J.183 2001-03-09 9 11.1002/1000/5395 2.0 ITU-T J.183 2016-03-15 9 11.1002/1000/12766 * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Reco
8、mmendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T J.183 (03/2016) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The I
9、TU 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 Standardi
10、zation 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 tec
11、hnology which fall within ITU-Ts purview, the 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. Compli
12、ance 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 obl
13、igatory 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 implementati
14、on 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
15、 the date of approval of this Recommendation, ITU had 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 con
16、sult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2016 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.183 (03/2016) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Defini
17、tions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms: . 2 5 Conventions 3 6 Transmission system for multiple MPEG-2 transport streams or generic formats of transport streams . 3 6.1 Framing structure for transmission of multiple MPEG-2 TSs o
18、r generic formats of transport streams . 4 6.2 Physical interface and channel coding of the transmission system for multiple MPEG-2 TSs or generic formats of transport streams . 4 6.3 Structure of TSMF_header . 5 Annex A TSMF format for Annex C of ITU-T J.83 9 A.1 Introduction 9 A.2 Concept . 9 A.3
19、Superframe . 10 Appendix I System parameters of TSMF for Annex C of ITU-T J.83 . 13 Bibliography. 14 Rec. ITU-T J.183 (03/2016) 1 Recommendation ITU-T J.183 Time-division multiplexing of multiple MPEG-2 transport streams and generic formats of transport streams over cable television systems 1 Scope
20、This Recommendation specifies a time-division multiplexing (TDM) frame format for adapting multiple Motion Picture Experts Group version 2 (MPEG-2) transport streams (TSs) or generic formats of TSs, some of which exceed the transmission rate per channel, into the existing physical layer interface sp
21、ecified in Annex C of ITU-T J.83. This format may be applicable to other transmission systems. The frame format aims to multiplex TSs without change, except that some of the service information (SI) related to the network is replaced. By using this frame structure as an optional addition to conventi
22、onal digital transmission equipment, multiple TSs can be multiplexed as they are. The functionality of multiplexing TSs into a single TS is not needed. In addition, the expansion of the frame format, being compliant with the first edition (2001-03-09) of this Recommendation, can provide the function
23、ality for a high-speed transmission scheme by channel-bonding technology. The frame format enables a cable television operator to pack multiple TSs into a single channel or multiple channels. Operation of a cable distribution network would become flexible if services could be integrated on the basis
24、 of the TS. This Recommendation provides the information needed by designers and manufacturers of equipment (including receivers) for distributing digital multi-programme signals by cable networks. 2 References The following ITU-T Recommendations and other references contain provisions which, throug
25、h 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 th
26、e 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. ITU-T H.222.
27、0 Recommendation ITU-T H.222.0 (2014) | ISO/IEC 13818-1:2015, Information technology Generic coding of moving pictures and associated audio information: Systems. ITU-T H.262 Recommendation ITU-T H.262 (2012) | ISO/IEC 13818-2:2013, Information technology Generic coding of moving pictures and associa
28、ted audio information: Video. 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.94 Recommendation ITU-T J.94 (1998), Service information for digital broadcasting in cable television systems. ITU-T J.28
29、8 Recommendation ITU-T J.288 (2016), Encapsulation of type-length-value (TLV) packet for cable transmission systems. ITU-R BT.1869 Recommendation ITU-R BT.1869 (2010), Multiplexing scheme for variable-length packets in digital multimedia broadcasting systems. 2 Rec. ITU-T J.183 (03/2016) ISO/IEC 138
30、18-3 ISO/IEC 13818-3 (1998), Information technology Generic coding of moving pictures and associated audio information Part 3: Audio. ISO/IEC 13818-7 /IEC 13818-7 (2006), Information technology Generic coding of moving pictures and associated audio information Part 7: Advanced Audio Coding (AAC). 3
31、Definitions 3.1 Terms defined elsewhere None. 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 fragmented TLV packet: A fixed-length packet that has fragmented type-length-value (TLV). 3.2.2 generic format of transport stream: A data stream other than M
32、otion Picture Experts Group version 2 (MPEG-2) transport stream (TS), e.g., type-length-value (TLV). For transmitting a TLV stream in an existing ITU-T J.83 system, packetization is carried out in accordance with ITU-T J.288. 3.2.3 network: A collection of Motion Picture Experts Group version 2 (MPE
33、G-2) transport stream (TS) multiplexes transmitted on a single delivery system, e.g., all digital channels on a specific cable system. 3.2.4 original_network_id: A label identifying the network_id of the originating delivery system. 3.2.5 physical interface: The interface on a physical layer equipme
34、nt for transmission. 3.2.6 programme: A concatenation of one or more events under the control of a broadcaster, e.g., news show, entertainment show. 3.2.7 set-top box: A hardware box that contains a digital signal demodulator, de-multiplexer, Motion Picture Experts Group version 2 (MPEG-2) decoder,
35、other functionalities and interfaces related to digital signal reception and presentation of the distributed programme at the subscribers site. 3.2.8 stream_id: A unique identifier of a transport stream (TS) or other generic stream within an original network. 4 Abbreviations and acronyms: This Recom
36、mendation uses the following abbreviations and acronyms: bslbf bit string, left bit first CRC Cyclic Redundancy Check HD High Definition HDTV High-Definition Television MPEG-2 Motion Picture Experts Group version 2 NIT Network Information Table PID Packet Identifier QAM Quadrature Amplitude Modulati
37、on Rec. ITU-T J.183 (03/2016) 3 rpchof remainder polynomial coefficients, highest order first SI Service Information SMATV Satellite Master Antenna Television TDM Time-Division Multiplexing TLV Type-Length-Value TS Transport Stream TSMF Transport Stream Multiplexing Frame TV Television UHDTV Ultra H
38、igh-Definition Television uimsbf unsigned integer, most significant bit first 5 Conventions In this Recommendation: 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 keywor
39、ds is recommended indicate a requirement which is recommended but which is not absolutely 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 confo
40、rmance to this document is to be claimed. The keywords can optionally indicate an optional 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 e
41、nabled by the network operator/service provider. Rather, it means the vendor may optionally 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
42、interpreted, respectively, as is required to, is prohibited from, is recommended and 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 Transmission system for multiple MPEG-
43、2 transport streams or generic formats of transport streams The framing structure for a transmission system for multiple MPEG-2 TSs or generic formats of TSs meets the following requirements: a) multiple MPEG-2-TSs and generic formats of TSs are required to be transmitted over a digital carrier in c
44、ompliance with the specification of existing cable TV systems; b) all packets of all MPEG-2-TSs or generic formats of TSs are required to be transmitted without any packet loss; c) all MPEG-2-TSs received are required to be in compliance with the specification of MPEG-2 systems; d) the transmission
45、system is required to make effective use of cable TV channel capacity; e) delay time resulting from optional use of signal processing is required not to affect digital broadcasting services; 4 Rec. ITU-T J.183 (03/2016) f) the added cost of introduction of the optional facilities in a cable TV heade
46、nd and the receiver is required to be low; g) the system is required to support interoperability with conventional single TS transmission systems for cable distribution; h) the system is recommended to support channel-bonding functionality for high-speed TSs such as ultra high-definition television
47、(UHDTV), while maintaining backward compatibility with conventional single carrier transmission systems. Concerning MPEG-2, systems coding is specified in ITU-T H.222.0; video coding is specified in ITU-T H.262 and audio coding is specified in ISO/IEC 13818-3 and ISO/IEC 13818-7. Concerning transpor
48、t streams (TSs), a data structure is specified in ITU-T H.222.0. 6.1 Framing structure for transmission of multiple MPEG-2 TSs or generic formats of transport streams The transmission system for multiple MPEG-2 TSs or generic formats of TSs uses the frame structure shown in Table 1 to multiplex mult
49、iple MPEG-2 TSs or generic formats of TSs. The frame structure is called the transport stream multiplexing frame (TSMF). The packets of the MPEG-2 TSs or generic formats of TSs shall be assigned to slots in the TSMF. A slot is constituted from 188 bytes, namely, the same size as a TS packet, and the TSMF consists of N slots. The TSMF has a TSMF_header, which contains information about multiplexing and de-multiplexing in the first slot. By outputting this frame repeatedly, multiple MPEG-2 TSs or generic formats of
