SIST ETS 300 799:1999

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digitalna zvokovna radiodifuzija (DAB) - Vmesniki za razpošiljanje - Vmesnik za razpošiljanje oddajanega signala (ETI))Digital Audio Broadcasting (DAB); Distribution interfaces; Ensemble Transport Interface (ETI)33.170Televizijska in radijska difuzijaTelevision and radio broadcastingICS:Ta slovenski standard je istoveten z:ETS 300 799 E13SIST ETS 300 799:1999en01-MXQLM19993SIST ETS 300 799:1999SLOVENSKI
STANDARD
EUROPEANETS 300 799TELECOMMUNICATIONSeptember 1997STANDARDSource: EBU/CENELEC/ETSI JTCReference: DE/JTC-00DAB-7ICS:33.020Key words:DAB, digital, audio, broadcasting, transport, interfaceEBUUEREuropean Broadcasting UnionUnion Européenne de Radio-TélévisionDigital Audio Broadcasting (DAB);Distribution interfaces;Ensemble Transport Interface (ETI)ETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEX.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.frTel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1997.© European Broadcasting Union 1997.All rights reserved.SIST ETS 300 799:1999

Page 2ETS 300 799: September 1997Whilst every care has been taken in the preparation and publication of this document, errors in content,typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to"ETSI Editing and Committee Support Dept." at the address shown on the title page.SIST ETS 300 799:1999

Page 3ETS 300 799: September 1997ContentsForeword.7Introduction.81Scope.112Normative references.113Definitions, abbreviations and symbols.123.1Definitions.123.2Abbreviations.143.3Symbols.153.3.1Numerical ranges.153.3.2Bit and byte numbering.153.3.3Arithmetic operators.153.3.4Logical operators.153.4Ordering of bytes and bits for transmission.163.5Reserved bits.164Overview of the Ensemble Transport Interface (ETI) definition.174.1The Layered approach to the ETI.174.2ETI data capacity.194.3Minimum requirement for ETI equipment.195Logical definition of ETI(LI).195.1General structure.205.2Error field (ERR).205.3Frame Characterization field (FC).225.3.1Frame Count (FCT).225.3.2Fast Information Channel Flag (FICF).225.3.3Number of Streams (NST).225.3.4Frame Phase (FP).235.3.5Mode Identity (MID).235.3.6Frame Length (FL).235.4Stream Characterization (STC).245.4.1Sub-channel Stream Characterization (SSTCn).245.4.1.1Sub-Channel Identifier (SCID).245.4.1.2Sub-channel Start Address (SAD).245.4.1.3Sub-channel Type and Protection Level (TPL).255.4.1.4Sub-channel Stream Length (STL).255.5End-Of-Header data (EOH).255.5.1Multiplex Network Signalling Channel (MNSC).255.5.2Header Cyclic Redundancy Checksum (CRCh).265.6Main Stream data (MST).265.7End Of Frame (EOF).275.7.1Cyclic Redundancy Checksum (CRC).275.7.2Reserved bytes.275.8ETI(LI) Time Stamp (TIST).275.9Null transmissions.275.10Total number of bytes carrying information.275.11Maximum size of ETI(LI).276Network Independent layer for G.703 interfaces, ETI(NI) or ETI(NI, G.703).286.1General.286.2Adaptation of the logical layer.296.2.1Synchronization Field (SYNC).296.2.1.1Error Status (ERR).29SIST ETS 300 799:1999

Page 4ETS 300 799: September 19976.2.1.2Frame Synchronization Field (FSYNC).296.2.2ETI(LI) Data Field (LIDATA).306.2.3Frame Padding Field (FRPD).306.3Physical interface.307Network Independent Layer for V.11 interfaces, ETI(NI, V11).317.1General.317.2Adaptation of the logical layer.327.2.1Synchronization Field (SYNC).327.2.1.1Error Status (ERR).327.2.1.2Frame Synchronization Field (FSYNC).327.2.2ETI(LI) Data Field (LIDATA).337.2.3Frame Padding Field (FRPD).337.3Physical interface.338Network Adaptation for G.704 networks, ETI(NA, G.704).348.1General.348.2Transparency of ETI(NA, G.704) layer to ETI(LI).358.2.1Transparency of ETI(NA, G.704)5592 layer to ETI(LI).358.2.2Transparency of ETI(NA, G.704)5376 layer to ETI(LI).358.3ETI(NA, G.704) structure.358.3.1G.704 reserved bytes.368.3.2ETI(NA, G.704) reserved bytes.368.3.2.1Multiframe management byte, Mbl,s.368.3.2.2Multiframe supervision byte, Sbl,s.388.4ETI(NA, G.704) multiframe generation.388.4.1General description.388.4.2Error coding and interleaving for ETI(NA, G.704)5592.398.4.2.1Coding array formation.398.4.2.2Interleaving.408.4.2.3Output array formation.408.4.3Error coding and interleaving for ETI(NA, G.704)5376.408.4.3.1Coding array formation.408.4.3.2Interleaving.418.4.3.3Output array formation.418.5Order of data transmission.418.6Error protection code.418.7Synchronization.418.7.1Synchronization of G.704 frames.418.7.2Synchronization of ETI(NA, G.704) multiframes.428.8Physical interface.428.9Modifying the ETI(LI) STAT field.428.10Illustration of the capacity of ETI(NA, G.704).45Annex A (normative):Coding of MNSC Data.46A.1Introduction.46A.2Frame Synchronous Signalling (FSS).46A.2.1FSS messages structure.46A.2.2Pre-assigned FSS message types.46A.3Frame Asynchronous Signalling (ASS).47A.3.1ASS messages structure.47A.3.2Pre-assigned ASS message types.47A.3.2.1ASS message type 0: Transmitter Set-up and Control Information (TSC).47Annex B (normative):Coding of NASC Data.49B.1General.49B.2Frame Synchronous Signalling (FSS).49SIST ETS 300 799:1999

Page 5ETS 300 799: September 1997B.3Asynchronous Signalling (ASS).49Annex C (normative):Coding of timestamps.50C.1General.50C.2Timestamp coding.50C.2.1Expected range of timestamp values.50C.2.2Null timestamp.50C.2.3Reserved timestamp values.50C.2.4Timestamp levels.50C.3Mapping to ETI(LI) timestamp bits.50C.4Mapping to ETI (NA, G.704) timestamp bits.51C.5Interpretation of timestamp value.51C.6Use of timestamps in LI and NA layers.51Annex D (normative):Calculation of CRC words in the ETI.52Annex E (normative):Behaviour of the ETI during re-configuration.53E.1Background.53E.2Multiplex reconfiguration.53Annex F (informative):Managing delay in the Ensemble Transport network.55F.1General.55F.2Dynamic delay compensation.56Annex G (informative):Network testing and monitoring.58G.1General.58G.2Pseudo Random Binary Sequence (PRBS).58G.2.1PRBS generator.58G.2.2PRBS extractor.59G.3PRBS containers.59G.3.1Full DAB channel.59G.3.2Single DAB sub-channel.59G.3.3G.704 ts16 measurement.60Annex H (informative):Cascading in the Ensemble Transport network.61H.1General.61H.2Management of the overall delay to allow SFN operation.61H.3Testing and monitoring in a cascaded network.61Annex J (informative):Carrying ETI on 1 544 kbit/s links.63J.1Introduction.63J.2General outline of ETI(NA, G.704-T1).63J.3Transparency of ETI(NA, G.704-T1) layer to ETI(LI).63SIST ETS 300 799:1999

Page 6ETS 300 799: September 1997J.3.1Transparency of ETI(NA, G.704-T1)4464 layer to ETI(LI).63J.3.2Transparency of ETI(NA, G.704-T1)4320 layer to ETI(LI).63J.4ETI(NA, G.704-T1) structure.64J.5Error protection for ETI(NA, G.704-T1).64J.6Illustration of the capacity of ETI(NA, G.704-T1).65Annex K (informative):Bibliography.69History.70SIST ETS 300 799:1999

Page 7ETS 300 799: September 1997ForewordThis European Telecommunication Standard (ETS) has been produced by the Joint Technical Committee(JTC) of the European Broadcasting Union (EBU), Comité Européen de Normalisation ELECtrotechnique(CENELEC) and the European Telecommunications Standards Institute (ETSI).NOTE:The EBU/ETSI JTC was established in 1990 to co-ordinate the drafting of ETSs in thespecific field of broadcasting and related fields. Since 1995 the JTC became a tripartitebody by including in the Memorandum of Understanding also CENELEC, which isresponsible for the standardization of radio and television receivers. The EBU is aprofessional association of broadcasting organizations whose work includes theco-ordination of its Members' activities in the technical, legal, programme-making andprogramme-exchange domains. The EBU has Active Members in about 60 countriesin the European Broadcasting Area; its headquarters is in Geneva*.*European Broadcasting UnionCase Postale 67CH-1218 GRAND SACONNEX (Geneva)SwitzerlandTel:+41 22 717 21 11Fax:+41 22 717 24 81EUREKA Project 147 (DAB**)EUREKA Project 147 was established in 1987, with funding from the EC, to develop a system for thebroadcasting of audio and data to fixed, portable or mobile receivers. Their work resulted in the publicationof a European Standard, ETS 300 401 [1], for DAB which now has world-wide acceptance. The membersof the Eureka 147 Project are drawn from broadcasting organizations and telecommunication providerstogether with companies from the professional and consumer electronics industry.**DAB is a registered trademark owned by one of the EUREKA 147 partners.ETSI Project Team PT 84VAn ETSI Project Team was formed to produce this ETS describing the Digital Audio Broadcasting (DAB)Ensemble Transport Interface (ETI). The work of the Project Team was based on studies carried out by aEUREKA 147 Task Force on the definition of the ETI. The Project Team consisted of members ofEuropean broadcasting organizations and the consumer and professional electronics industry who hadalso been involved in the work of the EUREKA Task Force.Transposition datesDate of adoption:22 August 1997Date of latest announcement of this ETS (doa):31 December 1997Date of latest publication of new National Standardor endorsement of this ETS (dop/e):30 June 1998Date of withdrawal of any conflicting National Standard (dow):30 June 1998SIST ETS 300 799:1999

Page 8ETS 300 799: September 1997IntroductionThis ETS is one of a set associated with ETS 300 401 [1] describes the transmitted signal, the interfacebetween the broadcaster's transmitters and the listener's receiver. The associated ETSs describeadditional interfaces which can be used by broadcasters or network providers to build DAB networks.Figure 1 shows a DAB network in outline. For convenience, the Network is split into a number of differentparts, each managed by a different entity. The different entities are: the Programme/Data provider, theService Component provider, the Ensemble provider and the Transmission Network provider.NOTE:A Service Component provider may be generating a full DAB service or a componentof a DAB service. For the purposes of this ETS, the terms Service provider andService Component provider are interchangeable.Programme/Data providerThe Programme/Data provider is the originator of the audio programme or the data being carried withinthe DAB Service Component. The format for the output of the Programme/Data provider may take manydifferent forms and should be agreed between the Programme/Data provider and the Service Componentprovider.Service Component providerThe Service Component provider is producing one or more complete Service Components which can formthe complete DAB Service, but may not. The data from the Service Component provider will be of threedifferent types:-Service Component data which is to be inserted into the DAB Main Service Channel (MSC);-Service Information related to the Service Component data which is to be inserted into theFast Information Channel (FIC);-Other data, not intended for transmission, including status monitoring or control.The interface between the Service Component provider and the Ensemble provider is known as theService Transport Interface (STI) and is defined in EN 300 797 [2].Ensemble providerThe Ensemble provider receives a set of service components from one or more Service Componentproviders. He then formats the FIC, and generates an unambiguous description of the full DAB Ensemble.The ensemble description is passed to the Transmission Network provider via an interface called the ETIwhich is the subject of this ETS.Transmission Network providerThe Transmission Network provider generates the DAB Ensemble and transmits it to the receiver. Theoutput of the Transmission provider is defined by ETS 300 401 [1].In some cases, as an intermediate step, the Transmission provider may find it convenient to generate abase-band representation of the signal to be transmitted. The base-band representation, known as theDigital baseband I/Q Interface, is a set of digital samples defining the In-phase (I) and Quadrature (Q)components of the final carrier. This interface is defined in EN 300 798 [3] and provides a convenientinterface between digital processing equipment and radio-frequency modulating equipment.SIST ETS 300 799:1999

Page 9ETS 300 799: September 1997Programmeor Dataprovider N
ATransmission Network providerSTISTISTISTIETIProgrammeor Dataprovider 1
ZFrom other ServiceComponent providersSTI - Service Transport InterfaceETI - Ensemble Transport InterfaceDIQ - Digital Baseband I/Q InterfaceTransmitter 1Transmitter METIETIDIQDIQServiceComponentproviderServiceComponentproviderEnsembleproviderBasebandprocessingRFmodulationBasebandprocessingRFmodulationDAB Ensemble toETS 300 401 [1]DAB Ensemble toETS 300 401 [1]Programmeor Dataprovider 1
AProgrammeor Dataprovider N
ZService Component provider ZService Component provider AFigure 1: DAB network outlineSIST ETS 300 799:1999

Page 10ETS 300 799: September 1997Blank pageSIST ETS 300 799:1999

Page 11ETS 300 799: September 19971ScopeThis European Telecommunication Standard (ETS) establishes a standard method for the distribution ofDAB signals between DAB multiplexing equipment, which may be located at the broadcaster's studiocentres, and DAB modulation equipment located at transmission sites.ETS 300 401 [1] established a broadcasting standard for a DAB system. Broadcasters who implementDAB networks require methods for transporting DAB signals, or the component parts of a DAB signal,between studio centres, where the programme or data service originates, and the transmitter sites fromwhich the signal will be radiated. The network of circuits connecting the studio centre to the transmitters isgenerally known as the Distribution Network.This ETS is applicable to Distribution Networks used in a DAB System. It describes the characteristics of asignal suitable for transporting a full DAB Ensemble, comprising a number of sub-channels and aformatted Fast Information Channel (FIC), between the DAB Ensemble provider and the Transmissionnetwork provider. The interface is suitable for use on a number of different physical media includingstandard 2 Mbit/s switched telecommunication networks. Provision is made for the inclusion of appropriateerror detection and correction and for the management of network transit delay. Limited capacity is alsomade available for signalling from the studio centre to other equipment in the distribution network.This ETS is not applicable to the distribution of DAB signals where the Service Information is available inany form other than as a complete, correctly formatted, FIC. The interface described is intended for useon unidirectional networks and this ETS does not cover the provision of status nor control information inthe reverse direction (i.e. from transmitters back to the Ensemble provider or any other central monitoringpoint).2Normative referencesThis ETS incorporates, by dated and undated references, provisions from other publications. Thesenormative references are cited at appropriate places in the text and the publications are listed hereafter.For dated references, subsequent amendments to or revisions to any of these publications apply to thisETS only when incorporated in it by amendment or revision. For undated references, the latest edition ofthe publication referred to applies.[1]ETS 300 401 (1996): "Radio broadcasting systems; Digital Audio Broadcasting(DAB) to mobile, portable and fixed receivers".[2]prEN 300 797: "Digital Audio Broadcasting (DAB); Distribution interfaces;Service Transport Interface (STI)".[3]prEN 300 798: "Digital Audio Broadcasting (DAB); Distribution interfaces; Digitalbaseband I/Q interface (DIQ)".[4]ITU-T Recommendation G.703 (1972): "Physical/Electrical characteristics ofhierarchical digital interfaces: Section 6. Interface at 2 048 kbit/s".[5]ITU-T Recommendation X.24 (1988): "List of definitions for interchange circuitsbetween data terminal equipment (DTE) and data circuit-terminating equipment(DCE) on public data networks".[6]ITU-T Recommendation V.11 (1988): "Electrical characteristics for balanceddouble-current interchange circuits for general use with integrated circuitequipment in the field of data communications".[7]ITU-T Recommendation G.704 (1988): "Synchronous frame structures used atprimary and secondary hierarchical levels: Section 2.3 Basic frame structure at2 048 kbit/s".[8]ITU-T Recommendation G.706 (1988): "Frame alignment and cyclic redundancycheck (CRC) procedures relating to basic frame structures definedin Recommendation G.704".SIST ETS 300 799:1999

Page 12ETS 300 799: September 19973Definitions, abbreviations and symbols3.1DefinitionsFor the purposes of this ETS, the definitions of ETS 300 401 [1] and the following definitions apply:block: A component part of an ETI(NA, G.704) multiframe consisting of 8 G.704 frames. Each blockcomprises 256 bytes.CIFcount: The common interleaved Frame (CIF) counter as defined in ETS 300 401 [1].codeword: A Reed-Solomon codeword, as used by ETI(NA, G.704), comprises 240 bytes. Some of thesebytes are data bytes, others are check bytes.coding array: An array used in the conceptual description of ETI(NA, G.704).CRCh: A part of ETI(LI) containing a Cyclic Redundancy Check for header information.distribution network: The network of data circuits linking the Service provider, Ensemble provider andTransmission Network provider.ensemble multiplex: A set of data which describes the component parts of the DAB ensemble.ensemble multiplexer: A multiplexer which generates an Ensemble multiplex.ensemble provider: The manager of the DAB Ensemble multiplexer.ensemble transport network: The network carrying the Ensemble Transport Interface.EOF: A part of ETI(LI) containing End-Of-Frame information.EOH: A part of ETI(LI) containing End-Of-Header information.ERR: A part of ETI(LI) which can be modified by the physical layers to allow the reporting of ERRor statusinformation.ETI(LI): The logical definition of the Ensemble Transport Interface.ETI(NA, G.704): A network adapted Ensemble Transport Interface containing DAB data as well asadditional data to deal with network errors and delay variations.ETI(NA, X): Any of the specific implementations of ETI(NA) which are described in this ETS.ETI(NI): A generic reference to a basic physical implementation of the ETI suited to the local connection ofequipment. If there is any ambiguity in the text, then ETI(NI) shall be taken to be equivalent to ETI(NI,G.703).ETI(NI, G.703): A specific implementation of an ETI(NI) used on G.703 interfaces.ETI(NI, V11): A specific implementation of an ETI(NI) used on V.11 interfaces.ETI(NI, X): Any of the specific implementations of ETI(NI) which are described in this ETS.FC: A part of ETI(LI) containing Frame Characterization data.FCT: A part of ETI(LI) containing a Frame CounT.FICF: A part of ETI(LI) indicating whether FIC information is included, FIC Flag.FICL: The length, in words, of the FIC data carried by the ETI.SIST ETS 300 799:1999

Page 13ETS 300 799: September 1997FL: A part of ETI(LI) giving information about the Frame Length.FP: A part of ETI(LI) containing Frame Phase information.frame: An ETI Frame carries data representing a 24 ms period of the DAB ensemble.FRPD: A part of ETI(LI) containing FRame PaDding.FSYNC: The synchronizing field of ETI(NI, G.703) or ETI(NI, V11) frames.G.703: An ITU-T Recommendation giving information about the physical characteristics oftelecommunication interfaces.G.704 frame: A framing structure of 32 8-bit timeslots as defined in G.704 (for 2 Mbit/s interfaces).G.704: An ITU-T Recommendation defining telecommunication framing structures.GF(28): A mathematical entity (a Gallois Field of 256 entries) used in the process of producing Reed-Solomon error protection bytes.interleaving array: An array used in the conceptual description of ETI(NA, G.704).LIDATA field: A part of ETI(LI) which carries the data describing the DAB transmitted signal.Logical Interface (LI): A definition of the ETI which contains all the elements to be carried by theinterface, but has no physical manifestation.MID: A part of ETI(LI) giving information about the DAB Mode IDentity.MNSC: A part of ETI(LI) carrying a Multiplex Network Signalling Channel.mode: The DAB signal described in ETS 300 401 [1] is able to operate in four different modes (I to IV) tosuit different applications.MSC: The Main Service Channel, a part of the DAB signal described in ETS 300 401 [1].MST: A part of ETI(LI) carrying Main STream information, destined for the MSC and FIC fields of the DABensemble.multiframe: A composite frame structure used in ETI(NA, G.704) to map the 24 ms time-frame of ETI(LI)onto the elemental G.704 frames.NASC: A part of ETI(NA, G.704) carrying a Network Adapted Signalling Channel.Network Adaptation (NA): The process of adapting ETI(LI) to suit the characteristics of a particularnetwork.Network Independent (NI): A physical form of the ETI interface which is not adapted to any particularnetwork but can be used for a local connection between equipment.NST: A part of ETI(LI) giving information about the Number of STreams being carried.OFDM generator: The equipment which is the final recipient of the ETI signal and which applies the DABchannel encoding.Plesiochronous Digital Hierarchy (PDH): A telecommunications network structure having a number ofdifferent hierarchical levels.Reed-Solomon: A form of coding which allows the correction of transmission errors.SSTCn: A part of ETI(LI) which defines the Sub-channel STream Characteristics of data stream n.SIST ETS 300 799:1999

Page 14ETS 300 799: September 1997Status Field (STAT): A part of the ETI(LI) which carries status information about the LIDATA field. TheSTAT field can be modified by physical interfaces to allow status information to be updated as the signal iscarried through the distribution network.STC: A part of ETI(LI) which carries information about the characteristics of the sub-channel datastreams.STL: A part of ETI(LI) which gives the STream Length of an uncoded sub-channel stream.stream: In ETI(LI) a data stream is associated with a DAB sub-channel and carries the data which willeventually be carried in the associated sub-channel of the DAB ensemble.superblock: One of the components of an ETI(NA, G.704) multiframe consisting of 8 blocks. Eachsuperblock comprises 2 048 bytes.SYNC: A part of ETI(NI, G.703) and ETI(NI, V11). The SYNChronization field carries status informationand signifies the start of the frame.timeslot: A part of the frame structure defined in G.704 comprising 8 bits.timestamp: Data which carries timing information intended to define the "delivery time" of the framecarrying the timestamp.TIST: A part of ETI(LI) comprising a 24-bit TImeSTamp.transmission network provider: The provider of the DAB Transmission Network. The ETI links theMultiplexer of the Ensemble Provider with the transmitters of the Transmission Network Provider.Transmitter Identification Information (TII): TII is a label unique to each transmitter in a DAB network.Provision is made for each transmitter to radiate its own TII label during the synchronization symbols ofthe transmitted signal.V.11: An ITU-T recommendation defining an electrical interface using balanced lines.word: A word consists of 4 bytes (32 bits).3.2AbbreviationsFor the purposes of this ETS, the abbreviations of ETS 300 401 [1] and the following abbreviations apply:ASSframe ASynchronous SignallingBERBit Error RateCOFDMCoded Orthogonal Frequency Division MultiplexCRCCyclic Redundancy ChecksumCRChheader CRCDABDigital Audio BroadcastingEOFEnd Of FrameEOHEnd Of HeaderERRError StatusETIEnsemble Transport InterfaceFCFrame CharacterizationFCTFrame CountFICFast Information ChannelFICFFast Information Channel FlagFLFrame LengthFPFrame PhaseFSSFrame Synchronous SignallingFSYNCFrame SYNCGrNbNumber of GroupsLILogical InterfaceLIDATAETI(LI) DATA fieldMIDMode IDentitySIST ETS 300 799:1999

Page 15ETS 300 799: September 1997MNSCMultiplex Network Signalling ChannelMSTMain StreamNANetwork AdaptationNASCNetwork Adapted Signalling ChannelNINetwork IndependentNSTNumber of Audio or Data StreamsPDHPlesiochronous Digital HierarchyRFRadio FrequencySADSub-channel Start AddressSBSignalling ByteSbchSub-channel ordinal numberSCIDSub-channel IdentifierSFNSingle Frequency NetworkSSTCnSub-channel Stream Characterization (For stream n)STATETI(LI) Status FieldSTCStream CharacterizationSTIService Transport InterfaceSTLStream Length (as a multiple of 64 bits)SYNCSynchronization fieldTISTTimestampTPLType and Protection LevelTSCTransmitter Set-up and Control information3.3SymbolsFor the purposes of this ETS, the following mathematical symbols apply:3.3.1Numerical ranges[m.n]denotes the numerical range m, m+1, m+2,., n, where m and n are positiveintegers with n > m.X16the subscript "16" is used to denote hexadecimal numbers.3.3.2Bit and byte numberingbndenotes bit number n. n is usually in the range [0.7].Bm,fdenotes byte number m in frame number f.Bm,f(bn)denotes bit number n of byte m in frame f.xis used to denote an arbitrary binary value (0 or 1).NOTE:f may sometimes be omitted where no ambiguity results.3.3.3Arithmetic operators+Addition.´Multiplication.m DIV pdenotes the quotient part of the division of m by p (m and p are positiveintegers).m MOD pdenotes the remainder of the division of m by p (m and p are positive integers).()fiipq=ådenotes the sum: f(p) + f(p + 1) + f(p + 2) . + f(q).()fiipq=Õdenotes the product: f(p) ´ f(p + 1) ´ f(p + 2) . ´ f(q).3.3.4Logical operatorsANDLogical AND function.ORLogical OR function.XORExclusive-OR functionSIST ETS 300 799:1999

Page 16ETS 300 799: September 19973.4Ordering of bytes and bits for transmissionThe bytes of each ETI frame shall be transmitted sequentially with the lowest numbered byte beingtransmitted first e.g. byte B0,f is transmitted before byte B1,f and so on. The highest numbered byte offrame f shall be transmitted earlier than the lowest numbered byte of frame f + 1.The bits of each byte shall be transmitted sequentially with the lowest numbered bit being transmitted firste.g. B0,1(b0) is transmitted before byte B0,1(b1), and so on.Unless otherwise stated in the associated text, data shall be carried with its Most Significant bit (MSb) inthe lowest numbered bit of the lowest numbered byte. The next most significant bit shall be carried in thenext lowest numbered bit of the lowest numbered byte, and so on. This implies that the MSb of any databyte shall be received earlier than the Least Significant bit (LSb).3.5Reserved bitsIn some fields of the ETI, unused bits may be found. These are designated as:Rfa:Reserved for future addition. The future use of Rfa bits is not expected to modifythe usage of other bits in the same field as the Rfa bits.Rfu:Reserved for future use. The future use of Rfu bits can modify the usage ofother bits in the same field as the Rfu bits.Unless otherwise specified, the values of bits designated as either Rfa or Rfu shall be set to zero.SIST ETS 300 799:1999

Page 17ETS 300 799: September 19974Overview of the Ensemble Transport Interface (ETI) definition4.1The Layered approach to the ETILogical Definitionof the InterfaceApplication of theETI to simplephysical interfacesETI(NI, G703)ETI(NI, V11)ETI(NA, G704)ETI(LI)Application of theETI to networkstructuresMap to physical layerAdd network dependent dataFigure 2: The layers of the ETIThe Ensemble Transport Interface is an interface signal which allows DAB signals to be routed betweenthe Ensemble provider and the Transmission Network provider (see figure 1). The physical characteristicsof the various transmission links will differ and a universal interface standard is not appropriate. Theapproach adopted in this ETS is to define the ETI in a number of different layers as shown in figure 2.The Logical Interface (LI), called ETI(LI), is the basic definition of the interface at its simplest level. Itdefines all the data which are needed to implement the functionality required of the ETI but has nophysical manifestation. ETI(LI) contains sufficient information to specify precisely each element of theDAB signal to be generated, so that two OFDM generators fed with the same ETI inputs shall also haveidentical outputs (with the exception of the TII symbol).The simplest physical manifestation of the interface is a mapping of ETI(LI) onto basic standardinterfaces. These are called Network Independent (NI) layers. The Network Independent layers aresuitable for use as interconnections between local equipment. However, since they contain onlyrudimentary error detection, they should not be used for transporting DAB over data networks unless thenetwork is known to have an adequate performance. This can occur, for instance, on a satellite circuitwhere a satellite modem applies forward error correction appropriate to the characteristics of the satellitepath. The Network Independent layer provides an interface signal to the satellite modem.The different NI layers are designated as ETI(NI, X) where "X" signifies the appropriate type of localinterface.A Network Adaptation (NA) of the Logical Interface is also defined. Network Adaptation implies amapping of the Logical Interface onto a physical signal suitable for transportation on the type of networkenvisaged. The Network Adaptation will include a definition of a physical interface as well as incorporatingadditional data in order to mitigate the characteristics of the transport network e.g. forward error correctionbytes to allow correction or detection of network errors.The different network adapted versions of the ETI are designated as ETI(NA, X) where "X" signifies theparticular type of network to which the NA version is suited. ETI(NA) is sometimes used to make a genericreference applicable to all NA Layers.SIST ETS 300 799:1999

Page 18ETS 300 799: September 1997Fast InformationBlock assemblermultiplexcontrollerServiceInformationassemblerEnergydispersalscramblerConvolutionalencodermainservicemultiplexerDAB transmissionsignalFIC Data servicesmultiplexcontroldataProgrammeAssociated Data48 kHz PCMaudio signalStreammodedataDABAudio framePacketmodedataTimeinterleaverpacketmultiplexassemblerpacket modeSITransmissionframemultiplexerFIC and MSC(frequencyinterleaved)symbolgeneratorSynch. channelsymbolgeneratorOFDMsignal generatorTII signalgeneratorCIFsAudio ProgrammeServicesServiceInformationEnergydispersalscramblerConvolutionalencoderTimeinterleaverTimeinterleaverConvolutionalencoderEnergydispersalscramblerConditionalAccessscramblerpacketmultiplexassemblerConditionalAccessscramblerConditionalAccessscramblerConditionalAccessscramblerConditionalAccessscramblerEnergydispersalscramblerConvolutionalencoderTimeinterleaverEnergydispersalscramblerConvolutionalencoderFIBsFIDCMCISIISO 11172-3Layer IIaudio encodergeneralDataservicescontrols(t)s
(t)TIIConceptuallocation of ETIFigure 3: Conceptual DAB emission block diagram showing the location of the ETISIST ETS 300 799:1999

Page 19ETS 300 799: September 1997In some applications it may be convenient to produce the ETI in one physical form at a point in theDistribution Network and to convert to another physical form elsewhere in the network. Conceptually, atleast, the conversion process between one physical form and another should include the re-generation ofthe logical, ETI(LI), level.Figure 3 is copied from ETS 300 401 [1] and shows the conceptual block diagram of the emission part ofthe DAB system. The conceptual location of the ETI is shown on the diagram.4.2ETI data capacityThe transmission capacity of the MSC (including channel coding) is 2 304 kbit/s and is independent of thetransmission mode.The transmission capacity of the FIC (including channel coding) is 96 kbit/s in modes I, II and IV and128 kbit/s in mode III.In order that the ETI can be transported via networks with a capacity of 2 Mbit/s or less, DAB channelcoding shall not be applied at the ETI source. Instead, DAB channel coding shall be applied at the ETIdestination (by the Transmission Network provider).Since the amount o
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