1、 ETSI TS 102 820 V4.1.1 (2016-03) Digital Radio Mondiale (DRM); Multiplex Distribution Interface (MDI) TECHNICAL SPECIFICATION ETSI ETSI TS 102 820 V4.1.1 (2016-03)2 Reference RTS/JTC-DRM-33 Keywords broadcasting, digital, DRM, interface, MUX, radio ETSI 650 Route des Lucioles F-06921 Sophia Antipol
2、is 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: http:/www.etsi.org/standards-search The present docu
3、ment 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 contents between such versions and/
4、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 status. Information on the current st
5、atus of this and other ETSI documents is available at https:/portal.etsi.org/TB/ETSIDeliverableStatus.aspx If you find errors in the present document, please send your comment to one of the following services: https:/portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may
6、 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 the foregoing r
7、estriction extend to reproduction in all media. European Telecommunications Standards Institute 2016. European Broadcasting Union 2016. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks
8、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 102 820 V4.1.1 (2016-03)3 Contents Intellectual Property Rights 4g3Foreword . 4g3Modal verbs terminology 4g3Introd
9、uction 4g31 Scope 6g32 References 6g32.1 Normative references . 6g32.2 Informative references 6g33 Definitions, symbols, abbreviations and conventions 6g33.1 Definitions 6g33.2 Symbols 8g33.3 Abbreviations . 8g33.4 Conventions 9g34 General description. 9g34.1 System overview 9g34.2 System architectu
10、re 9g34.2.0 General 9g34.2.1 TAG items and packets (informative) . 11g35 TAG items 11g35.0 Introduction 11g35.1 Mandatory TAG items 12g35.1.0 General 12g35.1.1 Protocol type and revision (*ptr) 13g35.1.2 DRM logical frame count (dlfc) . 13g35.1.3 Fast access channel (fac_) . 14g35.1.4 Service descri
11、ption channel (sdc_) . 14g35.1.5 Service description channel information (sdci). 15g35.1.6 Robustness mode (robm) 15g35.1.7 Stream (str0, str1, str2 and str3) 16g35.2 Optional TAG items . 16g35.2.0 General 16g35.2.1 Information (info) . 16g35.2.2 Timestamp (tist) 17g35.3 Revision history 17g3Annex A
12、 (informative): Typical DRM networks . 19g3Annex B (informative): DRM Timestamps 20g3B.1 Relationships 20g3B.2 Rationale . 20g3Annex C (normative): Physical presentation . 21g3Annex D (normative): MDI switching mechanism 22g3D.0 Introduction 22g3D.1 Scenario examples 22g3D.2 MDI Configuration Announ
13、cement Packets 23g3D.3 Timing diagram example 24g3History 25g3ETSI ETSI TS 102 820 V4.1.1 (2016-03)4 Intellectual 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 av
14、ailable 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 se
15、rver (https:/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 bec
16、ome, 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 Institut
17、e (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 responsib
18、le 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 ab
19、out 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 Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“,
20、“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 provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. Introduction The frequency b
21、ands used for broadcasting below 30 MHz are: Low Frequency (LF) band - from 148,5 kHz to 283,5 kHz, in ITU Region 1 i.1 only; Medium Frequency (MF) band - from 526,5 kHz to 1 606,5 kHz, in ITU Regions 1 i.1 and 3 i.1 and from 525 kHz to 1 705 kHz in ITU Region 2 i.1; High Frequency (HF) bands - a se
22、t of individual broadcasting bands in the frequency range 2,3 MHz to 27 MHz, generally available on a Worldwide basis. These bands offer unique propagation capabilities that permit the achievement of: large coverage areas, whose size and location may be dependent upon the time of day, season of the
23、year or period in the (approximately) 11 year sunspot cycle; portable and mobile reception with relatively little impairment caused by the environment surrounding the receiver. ETSI ETSI TS 102 820 V4.1.1 (2016-03)5 There is thus a desire to continue broadcasting in these bands, perhaps especially i
24、n the case of international broadcasting where the HF bands offer the only reception possibilities which do not also involve the use of local repeater stations. However, broadcasting services in these bands: use analogue techniques; are subject to limited quality; are subject to considerable interfe
25、rence as a result of the long-distance propagation mechanisms which prevail in this part of the frequency spectrum and the large number of users. As a direct result of the above considerations, there is a desire to effect a transfer to digital transmission and reception techniques in order to provid
26、e the increase in quality which is needed to retain listeners who, increasingly, have a wide variety of other programme reception media possibilities, usually already offering higher quality and reliability. In order to meet the need for a digital transmission system suitable for use in all of the b
27、ands below 30 MHz, the Digital Radio Mondiale (DRM) consortium was formed in early 1998. The DRM consortium is a non-profit making body which seeks to develop and promote the use of the DRM system worldwide. Its members include broadcasters, network providers, receiver and transmitter manufacturers
28、and research institutes. More information is available from their website (http:/www.drm.org/). In March 2005, the DRM Consortium voted at its General Assembly to embark on extending the capability of the DRM system to provide digital radio services at higher transmission frequencies. This range inc
29、ludes: 47 MHz to 68 MHz (Band I) allocated to analogue television broadcasting; 65,8 MHz to 74 MHz (OIRT FM band); 76 MHz to 90 MHz (Japanese FM band); 87,5 MHz to 107,9 MHz (Band II) allocated to FM radio broadcasting. This extension completes the family of digital standards for radio broadcasting.
30、 ETSI ETSI TS 102 820 V4.1.1 (2016-03)6 1 Scope The present document gives the specification for the link between a Digital Radio Mondiale (DRM) Multiplexer and a DRM Modulator. 2 References 2.1 Normative references References are either specific (identified by date of publication and/or edition num
31、ber or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location m
32、ight be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. The following referenced documents are necessary for the application of the present document. 1 ETSI ES 201 980:
33、 “Digital Radio Mondiale (DRM); System Specification“. 2 ETSI TS 102 821: “Digital Radio Mondiale (DRM); Distribution and Communications Protocol (DCP)“. 3 ISO/IEC 10646: “Information technology - Universal Multiple-Octet Coded Character Set (UCS)“. 4 ETSI TS 102 358: “Digital Radio Mondiale (DRM);
34、Specific Restrictions for the use of the Distribution and Communication Protocol (DCP)“. 2.2 Informative references References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For
35、 non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. The following referenced documents are not necessary f
36、or the application of the present document but they assist the user with regard to a particular subject area. i.1 ITU Radio Regulations. 3 Definitions, symbols, abbreviations and conventions 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: Alternat
37、ive Frequency Switching (AFS): feature of the DRM multiplex which allows receivers to automatically re-tune to a frequency offering more reliable reception without a break in the decoded audio byte: collection of 8-bits ETSI ETSI TS 102 820 V4.1.1 (2016-03)7 Coordinated Universal Time (literally Uni
38、versel Temps Coordonn) (UTC): time format counting in standard SI seconds with periodic adjustments made by the addition (or removal) of leap seconds to keep the difference between UTC and Astronomical Time less than 0,9 s NOTE: TAI and UTC were defined as having an initial offset of 10 s on January
39、 1st1972 (TAI prior to this date had a variable fractional offset to UTC as the two times did not use the same definition of the second). As at 25thFebruary 2003 there have been 22 leap seconds, all positive, making TAI = UTC + 32. Distribution and Communication Protocol (DCP): transport layer commu
40、nications protocol providing fragmentation, addressing and/or reliable data transmission over errored channels using a Reed Solomon code to provide Forward Error Correction (FEC) Fast Access Channel (FAC): channel of the multiplex data stream that contains the information that is necessary to find s
41、ervices and begin to decode the multiplex Greenwich Mean Time (GMT): historically the standard time for all international applications, now superseded by UTC Global Position System (GPS): constellation of satellites providing accurate time and position information to receivers GPS Time: time signal
42、broadcast by the GPS satellites using an epoch of January 6th1980 with no leap seconds and a “week number“ (actually a modulo-604 800 seconds number) that wraps every 1 024 weeks (approximately 19,7 years) logical frame: contains data of one stream during 400 ms for robustness modes A to D or 100 ms
43、 for robustness mode E multiplex frame: logical frames from all streams form a multiplex frame NOTE: It is the relevant basis for coding and interleaving. Main Service Channel (MSC): channel of the multiplex data stream which occupies the major part of the transmission frame and which carries all th
44、e digital audio services, together with possible supporting and additional data services MDI Packet: A TAG: packet containing those TAG Items as defined in the present document Modified Julian Date (MJD): date format based on the number of days since midnight GMT on 17thNovember 1858 AD NOTE: Time c
45、an be represented as a fraction of a day, however as MJD is subject to leap seconds, the fractional part corresponding to an SI second is of variable size and hence complex to implement in a fixed width bit-field. Multi-Frequency Network (MFN): network of transmitters serving a large geographic area
46、 using different radio frequencies to achieve improved reliability of reception NOTE: The transmitters might not be synchronized in time (non-synchronized MFN, see annex A), and so the AFS feature of DRM may not operate correctly. Service Description Channel (SDC): channel within the multiplex data
47、stream that gives information necessary to decode the services included in the multiplex NOTE: The SDC also provides additional information to enable a receiver to find alternate sources of the same data. Single Frequency Network (SFN): network of transmitters sharing the same radio frequency to cov
48、er a large area Synchronized Multi-Frequency Network (SMFN): network of transmitters serving a large geographic area using different radio frequencies to achieve improved reliability of reception NOTE: The transmitters are synchronized in time to allow the AFS feature of the transmitted signal to op
49、erate correctly. TAG Item: DCP elemental type combining in a single logical data the name, length and value of the data TAG Name: name field within an individual TAG Item used to identify an individual piece of information ETSI ETSI TS 102 820 V4.1.1 (2016-03)8 TAG Packet: collection of TAG Items with a header carrying a cohesive and self-contained block of data TAG Value: payload of a TAG Item International Atomic Time (literally Temps Atomique International) (TAI): time format counting in standard SI seconds NOTE: TAI and GP
