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1、 ETSI TS 1Digital VidModulator Interface (Ctransmission sysTECHNICAL SPECIFICATION103 287 V1.1.1 (2014ideo Broadcasting (DVB); (C2-MI) for a second generatiostem for cable systems (DVB14-09) tion digital B-C2) ETSI ETSI TS 103 287 V1.1.1 (2014-09)2Reference DTS/JTC-DVB-345 Keywords DVB, broadcasting

2、 ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice The present document can be downloaded from: h

3、ttp:/www.etsi.org The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any existing or perceived difference in c

4、ontents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of sta

5、tus. Information on the current status of this and other ETSI documents is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notifica

6、tion No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF version shall not be modified without the written authorization of ETSI. The copyright and

7、 the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2014. European Broadcasting Union 2014. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE

8、are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 103 287 V1.1.1 (2014-09)3Contents Intellectual Property Rights 4g3Foreword . 4g3Modal verbs termin

9、ology 4g3Introduction 5g31 Scope 6g32 References 6g32.1 Normative references . 6g32.2 Informative references 6g33 Definitions, symbols and abbreviations . 7g33.1 Definitions 7g33.2 Symbols 7g33.3 Abbreviations . 8g34 Overview 9g34.1 The DVB-C2 Modulator Interface concept 9g34.2 The protocol stack fo

10、r DVB-C2 distribution in backbone distribution systems . 9g35 Framing structure . 10g35.1 Symbol related TDM structure . 10g35.2 Frame related TDM structure . 13g36 Signalling in the symbol header . 13g37 DVB-C2 MI transmission, payload and overhead capacity per 8 MHz channel 17g38 Transport of C2-M

11、I packets . 17g38.1 Encapsulation of C2-MI packets in MPEG-2 TS . 17g38.1.1 Description 17g38.2 Encapsulation of MPEG-2 TS in IP packets. 18g38.2.1 Setup Information . 18g38.2.2 Transport protocols . 19g38.2.3 Session initiation and control 20g38.2.4 Network requirements . 20g3Annex A (normative): C

12、alculation of the CRC word . 21g3Annex B (informative): Examples for the usage of the C2 Modulator Interface . 22g3B.1 Example of a C2 Modulator Interface configuration for a C2 System in a single PLP/single Data Slice (Type 1) configuration with 8 MHz RF bandwidth . 22g3B.2 Example of a C2 Modulato

13、r Interface configuration for a C2 System with 8 MHz RF bandwidth and a multiple PLPs/Data Slices configuration . 23g3B.3 Example of a C2 Modulator Interface configuration for a C2 System with 22 MHz RF band and a Broadband notch 24g3Annex C (informative): Labeling of C2 Modulator Interface (C2-MI)

14、devices 27g3Annex D (informative): Bibliography . 28g3History 29g3ETSI ETSI TS 103 287 V1.1.1 (2014-09)4Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly

15、 available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web

16、 server (http:/ipr.etsi.org). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may be

17、come, essential to the present document. Foreword This Technical Specification (TS) has been produced by Joint Technical Committee (JTC) Broadcast of the European Broadcasting Union (EBU), Comit Europen de Normalisation ELECtrotechnique (CENELEC) and the European Telecommunications Standards Institu

18、te (ETSI). NOTE: The EBU/ETSI JTC Broadcast was established in 1990 to co-ordinate the drafting of standards in the specific field of broadcasting and related fields. Since 1995 the JTC Broadcast became a tripartite body by including in the Memorandum of Understanding also CENELEC, which is responsi

19、ble for the standardization of radio and television receivers. The EBU is a professional association of broadcasting organizations whose work includes the co-ordination of its members activities in the technical, legal, programme-making and programme-exchange domains. The EBU has active members in a

20、bout 60 countries in the European broadcasting area; its headquarters is in Geneva. European Broadcasting Union CH-1218 GRAND SACONNEX (Geneva) Switzerland Tel: +41 22 717 21 11 Fax: +41 22 717 24 81 The Digital Video Broadcasting Project (DVB) is an industry-led consortium of broadcasters, manufact

21、urers, network operators, software developers, regulatory bodies, content owners and others committed to designing global standards for the delivery of digital television and data services. DVB fosters market driven solutions that meet the needs and economic circumstances of broadcast industry stake

22、holders and consumers. DVB standards cover all aspects of digital television from transmission through interfacing, conditional access and interactivity for digital video, audio and data. The consortium came together in 1993 to provide global standardization, interoperability and future proof specif

23、ications. Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “may not“, “need“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisi

24、ons). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 103 287 V1.1.1 (2014-09)5Introduction Many cable operators today use centralized master headends, whereas most of the digital signal processing is performed. Often glass fiber based bac

25、kbone networks then distribute already finally multiplexed MPEG Transport Streams to the local headend stations, where the final channel lineup is defined by combining network-wide identical signals with the relevant local content. All signals are digitally DVB-C modulated, converted to the RF frequ

26、ency range and then distributed via the coaxial cable section of the cable infrastructure to the cable end customers. This architecture is called HFC (Hybrid Fiber Coax). Digital modulation of the second generation (DVB-C2) is more complex and provides more flexibility than the first generation (DVB

27、-C) technology. The C2 Modulator Interface allows splitting the DVB-C2 modulation functionality into a centralized part with the more complex digital processing functionalities and a quite simple decentralized part, which will be implemented in the local headends or even fiber nodes. The major advan

28、tage of such solution is twofold. There is on the one hand cost saving as the more complex part has to be implemented only once in the master headend and is shared for all local headends. On the other hand the operation of the centralized components can be handled better and more efficient at the 24

29、/7 staffed centralized master headends than in hundreds of local headends, which are usually not staffed and only remote managed. The C2 Modulator Interface will allow significant cost saving potential for cable operators running a HFC type network. The savings are obvious for TV services which are

30、distributed to all network segments. For local TV services, which are distributed only within one segment of a network, a local DVB-C2 modulator is most likely the commercial attractive solution. However, cable operators may decide to use the C2 MI even in this application in case they want run all

31、signal processing (encoding Multiplexing and modulation) in their master headend mainly for operational reasons. ETSI ETSI TS 103 287 V1.1.1 (2014-09)61 Scope The present document defines the interface to a modulator for a second generation cable television system (DVB-C2). This document also descri

32、bes a mechanism to distribute DVB-C2 modulated signals in the backbone distribution segment of cable networks in a cost effective way. 2 References References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, onl

33、y the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyp

34、erlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. 2.1 Normative references The following referenced documents are necessary for the application of the present document. 1 ETSI EN 302 769: “Digital Video Broadcasting (DVB); Frame st

35、ructure channel coding and modulation for a second generation digital transmission system for cable systems (DVB-C2)“. 2 ETSI EN 301 192: “Digital Video Broadcasting (DVB); DVB specification for data broadcasting“. 3 ETSI TS 102 034: “Digital Video Broadcasting (DVB); Transport of MPEG-2 TS Based DV

36、B Services over IP Based Networks“. 4 IETF RFC 3550: “RTP: A Transport Protocol for Real-Time Applications“. 5 ISO/IEC 13818-1: “Information technology - Generic coding of moving pictures and associated audio information: Systems“. 6 ETSI EN 300 468: “Digital Video Broadcasting (DVB); Specification

37、for Service Information (SI) in DVB systems“. 2.2 Informative references The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. i.1 EN 50083-9: “Cabled distribution systems for television, so

38、und and interactive multimedia signals; Part 9: Interfaces for CATV/SMATV headends and similar professional equipment for DVB/MPEG-2 transport streams“ (DVB Blue Book A010)“. i.2 DVB BlueBook A115: “DVB Application Layer FEC Evaluations“. ETSI ETSI TS 103 287 V1.1.1 (2014-09)73 Definitions, symbols

39、and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: broadband notch: set of adjacent OFDM Cells within each OFDM Symbol without transmitted energy, as defined in EN 302 769 1 C2 frame: fixed physical layer TDM frame that is further d

40、ivided into variable size Data Slices NOTE: C2 Frame starts with one or more Preamble symbol. C2 system: complete transmitted DVB-C2 signal, as defined in EN 302 769 1 C2_System_ID: unique identifier of a C2 system in a cable network as defined in EN 302 769 1 centre frequency: absolute frequency of

41、 the subcarrier, which is in the middle between the lowest and the hightest frequency subcarrier of a C2 system data slice: group of OFDM Cells carrying one or multiple PLPs in a certain frequency sub-band NOTE: This set consists of OFDM Cells within a fixed range of consecutive cell addresses withi

42、n each Data Symbol and spans over the complete C2 Frame, except the Preamble symbols. data symbol: OFDM symbol in a C2 Frame which is not a preamble symbol future use: value of any field indicated as “Future use“ shall be set to “0“ unless otherwise defined OFDM cell: modulation value for one OFDM c

43、arrier during one OFDM Symbol, e.g. a single constellation point OFDM symbol: waveform Ts in duration comprising all the active carriers modulated with their corresponding modulation values and including the guard interval Physical Layer Pipe (PLP): logical channel carried within one or multiple Dat

44、a Slice(s) NOTE 1: All signal components within a PLP share the same transmission parameters such as robustness, latency. NOTE 2: A PLP may carry one or multiple services. In case of PLP Bundling a PLP may be carried in several Data Slices. Transmission parameters may change each XFECFrame. preamble

45、 symbol: one or multiple OFDM Symbols, transmitted at the beginning of each C2 Frame, carrying Layer 1 part 2 signalling data Transport Stream (TS): multiplex signal as defined in ISO/IEC MPEG Systems specification 5 3.2 Symbols For the purposes of the present document, the following symbols apply:

46、123 A number without prefix denotes a decimal integer (base 10) 0x123 A number with a “0x“ prefix denotes a hexadecimal integer (base 16) (1010)2A number enclosed in parentheses, and with a number suffix denotes an integer to the base indicated by the suffix. EXAMPLE: The representations for the num

47、ber one-hundred and twenty three are: 123 to the base 10 (decimal), 0x7B to the base 16 (hexadecimal), and (1111011)2to the base 2 (binary). NOTE: For binary and hexadecimal representations it may sometimes be convenient to group digits, and fill in leading zeroes to accommodate common word sizes. T

48、he number one-hundred and twenty three can hence for example also be represented as 0x007B, 0x0000 007B, (0111 1011)2, or (0000 0000 0111 1011)2. ETSI ETSI TS 103 287 V1.1.1 (2014-09)83.3 Abbreviations For the purposes of the present document, the following abbreviations apply: 1 024-QAM 1 024-ary Q

49、uadrature Amplitude Modulation 16-QAM 16-ary Quadrature Amplitude Modulation 256-QAM 256-ary Quadrature Amplitude Modulation 4 096-QAM 4 096- ary Quadrature Amplitude Modulation 64-QAM 64-ary Quadrature Amplitude Modulation 8PSK 8-ary Phase Shift Keying ASI Asynchronous Serial Interface CATV Community Antenna Television CRC Cyclic Redundancy Check dB decibel DBPSK Differential Binary Phase Shift Keying DVB Digital Video Broadcasting project DVB-C2 DVB-C2 System NOTE: As specified in EN 302 769 1. FEC Forward Error Correction GI Guard Interval GS