1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T J.94 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1 (10/2000) SERIES J: TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Ancillary digital services for television transmission Service information for digital broadcasti
2、ng in cable television systems Amendment 1: Annex B Service information delivered out of band in cable television systems ITU-T Recommendation J.94 Amendment 1 (Formerly CCITT Recommendation) ITU-T J-SERIES RECOMMENDATIONS TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Gene
3、ral Recommendations J.1J.9 General specifications for analogue sound-programme transmission J.10J.19 Performance characteristics of analogue sound-programme circuits J.20J.29 Equipment and lines used for analogue sound-programme circuits J.30J.39 Digital encoders for analogue sound-programme signals
4、 J.40J.49 Digital transmission of sound-programme signals J.50J.59 Circuits for analogue television transmission J.60J.69 Analogue television transmission over metallic lines and interconnection with radio-relay links J.70J.79 Digital transmission of television signals J.80J.89 Ancillary digital ser
5、vices for television transmission J.90J.99 Operational requirements and methods for television transmission J.100J.109 Interactive systems for digital television distribution J.110J.129 Transport of MPEG-2 signals on packetised networks J.130J.139 Measurement of the quality of service J.140J.149 Dig
6、ital television distribution through local subscriber networks J.150J.159 For further details, please refer to the list of ITU-T Recommendations. ITU-T J.94/Amd.1 (10/2000) i ITU-T Recommendation J.94 Service information for digital broadcasting in cable television systems AMENDMENT 1 ANNEX B Servic
7、e information delivered out of band for digital cable television systems Summary This amendment provides the contents of Annex B that define a standard for Service Information (SI) on cable compatible with digital multiplex bit streams constructed in accordance with ITU-T H.222.0 | ISO/IEC 13818-1 (
8、MPEG-2). It is designed to support “navigation devices“ on cable. It defines the syntax and semantics for a standard set of tables providing the data necessary for such a device to discover and access digital and analogue services offered on cable. This SI protocol is nominally delivered in a separa
9、te physical channel (i.e. out-of-band) outside the actual transport multiplexes containing the program content. Source Amendment 1 to ITU-T Recommendation J.94 was prepared by ITU-T Study Group 9 (1997-2000) and approved by the World Telecommunication Standardization Assembly (Montreal, 27 September
10、 6 October, 2000). Keywords Cable television, service information. ii ITU-T J.94/Amd.1 (10/2000) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permane
11、nt 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, establishe
12、s 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 necessary standard
13、s 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. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility th
14、at 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 Recommenda
15、tion development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and
16、are therefore strongly urged to consult the TSB patent database. ITU 2001 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from ITU. ITU-T J.94/Amd
17、.1 (10/2000) iii CONTENTS Page Annex B Service information delivered out of band for digital cable television systems 1 B.1 Purpose, scope and organization. 1 B.1.1 Purpose 1 B.1.2 Scope . 1 B.1.3 Organization 2 B.2 References. 3 B.3 Definitions 4 B.3.1 Compliance notation 4 B.3.2 Definition of term
18、s. 4 B.3.3 Section and data structure syntax notation 5 B.4 Acronyms and abbreviations 6 B.5 Table structure 7 B.5.1 Table ID ranges and values . 7 B.5.2 Extensibility. 8 B.5.3 Reserved fields 9 B.5.4 Private table section syntax . 9 B.6 Table section formats 10 B.6.1 Network Information Table. 10 B
19、.6.2 Network Text Table. 15 B.6.3 Short-form Virtual Channel Table Section 17 B.6.4 System Timetable Section . 24 B.6.5 Master Guide Table (MGT). 25 B.6.6 Long-form Virtual Channel Table. 29 B.6.7 Rating Region Table (RRT) 34 B.6.8 Aggregate Event Information Tables (AEIT) 37 B.6.9 Aggregate Extende
20、d Text Tables (AETT). 39 B.7 Descriptors 41 B.7.1 Descriptor usage 41 B.7.2 Stuffing descriptor . 42 B.7.3 AC-3 audio descriptor . 42 B.7.4 Caption service descriptor . 42 B.7.5 Content advisory descriptor. 44 B.7.6 Revision detection descriptor 45 B.7.7 Two-Part channel number descriptor 46 B.7.8 C
21、hannel properties descriptor 46 B.7.9 Extended channel name descriptor 48 B.7.10 Time-shifted service descriptor . 48 iv ITU-T J.94/Amd.1 (10/2000) Page B.7.11 Component name descriptor 49 B.7.12 Daylight savings time descriptor . 49 B.7.13 User private descriptors . 50 B.8 Text string coding . 50 B
22、.8.1 Multilingual Text String (MTS) Format 51 B.8.2 Multiple String Structure (MSS) . 55 Annex B.A Operational profiles for cable service information delivery 58 B.A.1 Operational profiles . 58 B.A.2 Profile Definition Tables . 58 B.A.3 Operational considerations for the use of profiles (Informative
23、) 60 Annex B.B Packet rates 61 B.B.1 Maximum cycle times . 61 B.B.2 Maximum transmission rates. 61 B.B.3 Minimum transmission rates . 61 Annex B.C Standard Huffman tables for text compression 61 B.C.1 Character set definition 62 B.C.2 Standard compression Type 1 Encode/Decode Tables 64 B.C.3 Standar
24、d compression Type 2 Huffman Encode/Decode tables . 84 Appendix B.I Implementation recommendations . 102 B.I.1 Implications for retail digital cable-ready devices 102 B.I.2 Channel number handling 102 B.I.3 Processing of dynamic changes to service information. 102 B.I.4 AEITs may include event infor
25、mation for inaccessible channels . 102 B.I.5 Splice flag processing 102 Appendix B.II Service Information overview and guide 103 B.II.1 Table hierarchy 103 B.II.2 SI_base PID . 108 B.II.3 Representation of Time . 116 Appendix B.III Daylight Savings Time control 118 ITU-T J.94/Amd.1 (10/2000) 1 ITU-T
26、 Recommendation J.94 Service information for digital broadcasting in cable television systems AMENDMENT 1 ANNEX B Service information delivered out of band for digital cable television systems B.1 Purpose, scope and organization B.1.1 Purpose This annex defines a standard for Service Information (SI
27、) delivered out of band on cable. This annex is designed to support “navigation devices“ on cable. The current specification defines the syntax and semantics for a standard set of tables providing the data necessary for such a device to discover and access digital and analogue services offered on ca
28、ble. B.1.2 Scope This annex defines SI tables delivered via an out-of-band path to support service selection and navigation by digital cable set-top boxes and other “digital cable-ready“ devices. The SI tables defined in this annex are formatted in accordance with the Program Specific Information (P
29、SI) data structures defined in MPEG-2 Systems, ITU-T H.222.0 | ISO/IEC 13818-1. The formal definition of “digital cable-ready“ has a scope broader than that of the current standard. The formal definition includes requirements related to navigation and service selection, demodulation and decoding, vi
30、deo format decoding, Emergency Alert handling, and other aspects. The current specification supports, primarily, the navigation and service selection function for services delivered in the clear, as well as those subject to conditional access. This annex does not address the Electronic Program Guide
31、 application itself or any user interface which might deal with the presentation and application of the Service Information. A digital cable-ready device can take the form of a cable set-top box, a computer, a television, or a convergence of these. Devices such as digital video recorders may also be
32、 cable-ready. A digital cable-ready device capable of processing access controlled digital services supports an interface to a conditional access module. As used here, the term “Host“ refers to the capability to support an interface to a standard Point Of Deployment (POD) security module. SI data de
33、livered out of band is transported in accordance with the Extended Channel interface defined in SCTE DVS 131r7 (1998) and SCTE DVS 216r4 (2000). To have access to the Extended Channel interface, the cable-ready device must act as a Host to a POD security module. The Extended Channel interface presen
34、ts the needed SI data to the Host. This data can be used by the Host for channel navigation, construction of electronic program guides and other associated functions. Figure B.1 is a high-level block diagram illustrating the POD module to Host interface via the Extended Channel interface. The Host i
35、s responsible for providing a standard receiver/QPSK demodulator function for the POD module. The choice of transport format of bits coming across from the receiver/QPSK demodulator to the POD module is by mutual agreement between the POD and the cable head-end equipment. The transport format of dat
36、a travelling between the Host and 2 ITU-T J.94/Amd.1 (10/2000) POD module on the Extended Channel interface conforms to standards defined in SCTE DVS 131r7 (1998) and SCTE DVS 216r4 (2000). T0909340-00Host (Set-Top Box, DTV, Computer, or a combination)CableQPSKRxApp.ProprietaryTransportExtendedChann
37、el FlowsService_type =MPEG_sectionPODModulePODApp.Transport Processing,Filtering and RoutingFigure B.1/J.94 A framework for the extended channel service information stream The POD module may perform various transport, filtering, and error checking/correction functions on the out-of-band data stream
38、as depicted by the box labelled “Transport Processing, Filtering, and Routing.“ As described in SCTE DVS 216r4 (2000), the Host may request from the POD module to open one or several “flows“ in which to receive PSI sections taken from the cable out-of-band data stream. Each flow is associated with a
39、 PID value, in accordance with MPEG-2 Transport Stream concepts. Data flowing to the Host from the POD module that is associated with Service_type=MPEG_section is required to be in the form of MPEG PSI data structures. However, data delivered into the POD from cable out-of-band may or may not be org
40、anized in a Transport Stream compliant with ITU-T H.222.0 | ISO/IEC 13818-1. In other words, PID values associated with MPEG-2 tables on the Extended Channel interface may or may not correspond to MPEG-2 Transport Stream packet header PID values from the cable out of band. Independent of the fact th
41、at out-of-band data may reach the POD module via a proprietary method, the data structures delivered across the Extended Channel shall be formatted as MPEG-2 table sections. Like table sections carried in an MPEG-2 Transport Stream, each is associated with a PID value. B.1.3 Organization This annex
42、is organized as follows: Clause B.1 Provides this general introduction. Clause B.2 Lists applicable references. Clause B.3 Provides a list of definitions used in this annex. ITU-T J.94/Amd.1 (10/2000) 3 Clause B.4 Provides a list of acronyms and abbreviations used in this annex. Clause B.5 Describes
43、 the basic structure of sections. Clause B.6 Describes formats of sections carried in the Base PID.1 Clause B.7 Explains descriptors applicable to the tables defined in this annex. Clause B.8 Describes multilingual character string coding. Annex B.A Defines profiles of choice for cable operator comp
44、liance with this annex. Annex B.B Specifies packet rates for delivery of SI data. Annex B.C Defines the standard Huffman tables used for text compression. Appendix B.I Discusses recommendations for receiver implementations. Appendix B.II Provides an overview of tables defined in this Service Informa
45、tion Annex B. Appendix B.III Defines the daylight savings time control fields in the System Timetable. B.2 References Normative references The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation.
46、At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references li
47、sted below. A list of the currently valid ITU-T Recommendations is regularly published. ITU-T H.222.0 (2000) | ISO/IEC 13818-1:2000, Information technology Generic coding of moving pictures and associated audio information: Systems. ITU-T H.262 (2000) | ISO/IEC 13818-2: 2000, Information technology
48、Generic coding of moving pictures and associated audio information: Video. ISO 639:1988, Code for the representation of names of languages. ISO 639-2:1998, Codes for the representation of names of languages Part 2: Alpha-3 code. ISO/IEC 8859-1 to 10, Information technology 8-bit single-byte coded gr
49、aphic character sets. ISO/IEC 10646-1:2000, Information technology Universal Multiple-Octet Coded Character Set (UCS) Part 1: Architecture and Basic Multilingual Plane. ISO/IEC 13818-3:1998, Information technology Generic coding of moving pictures and associated audio Part 3: Audio. Informative references ITU-T J.83 (1997), Digital multi-programme systems for television, sound and data services for cable distribution. SCTE DVS 031, Digital Video Transmission Standard
