SIST EN 300 798:2000
(Main)Digital Audio Broadcasting (DAB); Distribution interfaces; Digital baseband In-phase and Quadrature (DIQ) interface
- Abstract
Specifies an interface which allows digital processing equipment for DAB to be connected to RF modulation equipment at DAB transmitter sites.
- Status
- Published
- Publication Date
- 31-Dec-1999
- Technical Committee
- RES - Radio equipment and systems
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Jan-2000
- Due Date
- 01-Jan-2000
- Completion Date
- 01-Jan-2000
- Mandate
- T-244
SIST EN 300 798:2000 is the Slovenian adoption of EN 300 798 V1.1.1 from ETSI. It specifies the Digital Audio Broadcasting (DAB) Digital baseband In-phase and Quadrature (DIQ) interface used to connect digital baseband processing equipment to RF modulation equipment at DAB transmitter sites. It is aimed at broadcasters, transmitter manufacturers, and system integrators who need a defined handoff between baseband processing and modulation, including test access to baseband I/Q signals.
What does SIST EN 300 798:2000 specify?
SIST EN 300 798:2000 establishes a standard method for carrying DAB baseband I/Q data over a digital interface. The interface is one-way, from a single source to a single destination, and it can also be used to access baseband I/Q signals for test purposes.
| Clause / annex | What it covers |
|---|---|
| Clause 1 | Scope and intended application at DAB transmitter sites |
| Clause 2 | Reference document |
| Clause 3 | Definitions, abbreviations, and symbols |
| Clause 4 | Conceptual location of the DIQ interface in the DAB chain |
| Clause 5 | General description of the DIQ signal, including the sample model |
| Clause 6 | Electrical and timing details of the DIQ interface |
| Annex A | Bibliography |
What are the key requirements of SIST EN 300 798:2000?
Clause 5 defines the DIQ signal as the sampled version of the in-phase and quadrature components of the DAB transmission signal. In practice, implementers must treat the interface as a sample stream for I and Q, not as an analog RF signal.
Clause 5.2 sets the sampling frequency at 2 048 kHz and the sample size at 8 bits. That fixes the basic timing and word length that both ends of the link must match.
Clause 5.3 defines how FFT output is normalized and limited before it is carried by DIQ. This matters because the baseband processor must map its computed sample values into the two’s complement range used on the interface, and one hexadecimal value is left unused.
Clause 6.1 requires the samples to be carried in parallel over balanced conductor pairs, with DATA[0] to DATA[7], CLK, Q/I, and optional FSYNC. It also specifies a 25-pin D-subminiature connector arrangement, so cable and connector selection are part of the design.
Clause 6.2 defines the behavior of the control signals. CLK runs at twice the sampling frequency, the 1-0 transition marks data transfer time, Q/I identifies whether the sample is I or Q, and FSYNC marks the start of a DAB transmission frame.
Clause 6.3 and 6.6 set electrical and timing limits for the link. The source and receiver must use balanced line drivers and receivers, with defined impedance, amplitude, common-mode tolerance, and jitter limits. In practice, this is what keeps the interface reliable over real cables and helps avoid timing errors.
Clause 6.4 assigns the signals to pins and recommends twisted-pair, shielded cabling. For installers, this is the wiring rule set for building a compliant interconnect.
What terms does SIST EN 300 798:2000 define?
- Baseband I/Q - A representation of the DAB transmission signal using in-phase and quadrature carrier components.
- Digital baseband I/Q - A sampled version of baseband I/Q using digital values for I and Q.
- OFDM - Orthogonal Frequency Division Multiplex, the modulation method used by DAB.
- COFDM - Coded Orthogonal Frequency Division Multiplex, the combination of channel coding and OFDM used in DAB.
- OFDM generator - The equipment that receives ETI and produces the DAB signal through baseband processing and RF modulation.
- FSYNC - The frame synchronization pulse that marks the start of a DAB transmission frame.
Who uses SIST EN 300 798:2000?
SIST EN 300 798:2000 is used by DAB transmitter designers, broadcast network operators, and equipment suppliers who need to connect baseband processing hardware to RF modulators. It is also relevant to test engineers who need access to baseband I/Q signals for verification or troubleshooting.
The document is useful for teams responsible for the transmitter-side chain of a DAB system, especially where different vendors supply the baseband processor and the modulator. It also helps cable, connector, and interface designers build the physical link between them.
Which standards are used with SIST EN 300 798:2000?
| Document | What it contributes |
|---|---|
| ITU-R BT.656-2 | Guidance relevant to longer cable lengths and equalization for balanced digital links |
| ETS 300 401 | The DAB transmitted signal and the main system reference |
| EN 300 797 | The Service Transport Interface (STI) |
| ETS 300 799 | The Ensemble Transport Interface (ETI) |
What does the SIST EN 300 798:2000 document contain?
The document includes a conceptual view of where the DIQ interface sits in the DAB transmission chain, together with the mathematical description of the sampled I/Q signal. It then gives the signal format, electrical characteristics, connector pin allocation, timing relationships, and clock jitter limits needed to implement the interface.
It also includes a pin table for the 25-pin connector and timing figures that show how DATA[0..7], Q/I, CLK, and FSYNC relate to each other. Figure-based material is used to make the sample timing and eye-diagram expectations clear for design and test work.
Annex A provides the bibliography used by the standard.
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Frequently Asked Questions
SIST EN 300 798:2000 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital Audio Broadcasting (DAB); Distribution interfaces; Digital baseband In-phase and Quadrature (DIQ) interface". This standard covers: Specifies an interface which allows digital processing equipment for DAB to be connected to RF modulation equipment at DAB transmitter sites.
Specifies an interface which allows digital processing equipment for DAB to be connected to RF modulation equipment at DAB transmitter sites.
SIST EN 300 798:2000 is classified under the following ICS (International Classification for Standards) categories: 33.170 - Television and radio broadcasting. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 798:2000 is associated with the following European legislation: Standardization Mandates: T-244. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
SIST EN 300 798:2000 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Digitalna zvokovna radiodifuzija (DAB) - Vmesniki za razpošiljanje - Vmesnik DIQDigital Audio Broadcasting (DAB); Distribution interfaces; Digital baseband In-phase and Quadrature (DIQ) interface33.170Televizijska in radijska difuzijaTelevision and radio broadcastingICS:Ta slovenski standard je istoveten z:EN 300 798 V1.1.13SIST EN 300 798:en01-MXQLM-3SIST EN 300 798:SLOVENSKI
STANDARD
European Telecommunications Standards Institute EN 300 798 V1.1.1 (1998-03)European Standard (Telecommunications series)Digital Audio Broadcasting (DAB);Distribution interfaces;Digital baseband In-phase and Quadrature (DIQ) interfaceEBUUEREuropean Broadcasting UnionUnion Européenne de Radio-TélévisionSIST EN 300 798:2000
EN 300 798 V1.1.1 (1998-03)2ReferenceDEN/JTC-DAB-6 (7e000ico.PDF)KeywordsDAB, digital, audio, broadcasting, interfaceETSI SecretariatPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/88Internetsecretariat@etsi.frhttp://www.etsi.frhttp://www.etsi.orgCopyright NotificationNo part may be reproduced except as authorized by written permission.The copyright and the foregoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1998.© European Broadcasting Union 1998.All rights reserved.SIST EN 300 798:2000
EN 300 798 V1.1.1 (1998-03)3ContentsIntellectual Property Rights.4Foreword.4Introduction.51Scope.72References.73Definitions, abbreviations and symbols.73.1Definitions.73.2Abbreviations.83.3Symbols.93.3.1Numerical ranges.93.3.2Bit numbering.93.3.3Arithmetic operators.93.3.4Functions.93.3.5Constants.94Conceptual location of the DIQ interface.95General description of the DIQ signal.95.1Mathematical definition.95.2Sampling frequency and sample size.105.3Numerical range.106Details of the Digital baseband I/Q interface (DIQ).126.1General.126.2Definition of DIQ signals.126.2.1The CLK signal.126.2.2The DATA signal.126.2.3The Q/I signal.126.2.4The FSYNC signal.136.2.5Signal direction.136.3Electrical characteristics of the DIQ interface.136.3.1General.136.3.2Logic convention.146.3.3Line driver characteristics (source).146.3.4Line receiver characteristics (destination).146.4Pin allocation of the DIQ signals.156.5Timing relationships.156.6CLK timing jitter.16Annex A (informative):Bibliography.17History.18SIST EN 300 798:2000
EN 300 798 V1.1.1 (1998-03)4Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin ETR 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect ofETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on the ETSIWeb server (http://www.etsi.fr/ipr).Pursuant to the ETSI Interim IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. Noguarantee can be given as to the existence of other IPRs not referenced in ETR 314 (or the updates onhttp://www.etsi.fr/ipr) which are, or may be, or may become, essential to the present document.ForewordThis European Standard (Telecommunications series) has been produced by the Joint Technical Committee (JTC) of theEuropean Broadcasting Union (EBU), Comité Européen de Normalization Electrotechnique (CENELEC) and theEuropean Telecommunications Standards Institute (ETSI).NOTE:The EBU/ETSI JTC was established in 1990 to co-ordinate the drafting of standards in the specific fieldof broadcasting and related fields. Since 1995 the JTC became a tripartite body by including in theMemorandum of Understanding also CENELEC, which is responsible for the standardization of radio andtelevision receivers. The EBU is a professional association of broadcasting organizations whose workincludes the co-ordination of its members' activities in the technical, legal, programme-making andprogramme-exchange domains. The EBU has active members in about 60 countries in the Europeanbroadcasting area; its headquarters is in Geneva.European Broadcasting UnionCH-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 the broadcasting ofaudio and data to fixed, portable or mobile receivers. Their work resulted in the publication of a European standard,ETS 300 401 (see bibliography), for DAB which now has world-wide acceptance. The members of theEUREKA 147 Project are drawn from broadcasting organizations and telecommunication providers together withcompanies from the professional and consumer electronics industry.*DAB is a registered trademark owned by one of the EUREKA 147 partners.National transposition datesDate of adoption of this EN:20 February 1998Date of latest announcement of this EN (doa):30 June 1998Date of latest publication of new National Standardor endorsement of this EN (dop/e):31 December 1998Date of withdrawal of any conflicting National Standard (dow):31 December 1998SIST EN 300 798:2000
EN 300 798 V1.1.1 (1998-03)5IntroductionThe present document is one of a set associated with DAB. ETS 300 401 (see bibliography) describes the transmittedsignal; the interface between the broadcaster's transmitters and the listener's receiver. The associated documents,EN 300 797 and ETS 300 799 (see bibliography), describe additional interfaces which can be used by broadcasters ornetwork providers to build DAB networks.Figure 1 shows a DAB network in outline. For convenience, the network is split into a number of different parts, eachmanaged by a different entity. The different entities are; the Programme/Data provider, the Service Component provider,the Ensemble provider and the Transmission Network provider.NOTE:A Service Component provider may be generating a full DAB service or a component of a DAB service.For the purposes of the present document, the terms Service provider and Service Component provider areinterchangeable.Programme/Data providerThe Programme/Data provider is the originator of the audio programme or the data being carried within the DABService Component. The format for the output of the Programme/Data provider may take many different forms andshould be agreed between the Programme/Data provider and the Service Component provider.Service Component providerThe Service Component provider is producing one or more complete Service Components which may form the completeDAB service, but may not. Data from the Service Component provider will comprise three different parts:-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 the Fast InformationChannel (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 the Service TransportInterface (STI) and is defined in EN 300 797 (see bibliography).Ensemble providerThe Ensemble provider receives a set of service components from one or more Service Component providers. He thenformats 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 ETI which isdefined in ETS 300 799 (see bibliography).Transmission Network providerThe Transmission Network provider generates the DAB Ensemble and transmits it to the receiver. The output of theTransmission provider is defined by ETS 300 401 (see bibliography). The Transmission Network provider is usually thefinal recipient of the ETI and is responsible for turning it into the DAB transmission signal using an OFDM generator.In some cases, as an intermediate step, the Transmission provider may find it convenient to generate a basebandrepresentation of the signal to be transmitted. The baseband representation, known as the DIQ, is a set of digital samplesdefining the In-phase (I) and Quadrature (Q) components of the final carrier. This interface is defined in the presentdocument and provides a convenient interface between digital processing equipment and radio-frequency modulatingequipment.SIST EN 300 798:2000
EN 300 798 V1.1.1 (1998-03)6Transmission Network ProviderSTISTISTISTIETIService Component provider AProgrammeor Dataprovider A(1)Programmeor Dataprovider A(n)Service Component provider ZProgrammeor Dataprovider Z(1)Programmeor Dataprovider Z(p)From 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]Figure 1: DAB network outlineSIST EN 300 798:2000
EN 300 798 V1.1.1 (1998-03)71ScopeThe present document establishes a standard method for the connection of digital processing equipment (which isproducing DAB baseband I/Q signals) and Radio Frequency (RF) modulation equipment in a DAB system. It can alsobe used to provide access to baseband I/Q signals for test purposes.ETS 300 401 established a broadcasting standard for a DAB system. Broadcasters who implement DAB networksrequire standardized interfaces for the connection of different equipment in the DAB chain.The present document is applicable to DAB channel coding equipment. It describes the characteristics of a suitableinterface for the connection of the two major elements of the DAB OFDM generator; the baseband processingequipment and the RF modulator. The interface provides an interconnection between a single source (the basebandprocessor) and a single destination (the RF modulator).The present document does not cover the generation of the digital I/Q baseband signals. This is covered inETS 300 401. The digital baseband I/Q interface is unidirectional and does not cover the provision of status nor controlinformation in the reverse direction (i.e. from the modulator back to the baseband processing section of the equipment).2ReferencesReferences may be made to:a)specific versions of publications (identified by date of publication, edition number, version number, etc.), inwhich case, subsequent revisions to the referenced document do not apply; orb)all versions up to and including the identified version (identified by "up to and including" before the versionidentity); orc)all versions subsequent to and including the identified version (identified by "onwards" following the versionidentity); ord)publications without mention of a specific version, in which case the latest version applies.A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the samenumber.[1]ITU-R BT.656-2 (November 1994): "Interfaces for digital component video signals in 525-lineand 625-line television systems".3Definitions, abbreviations and symbols3.1DefinitionsFor the purposes of the present document, the definitions of ETS 300 401 (see bibliography) and the followingdefinitions apply:baseband I/Q: A representation of the DAB transmission signal using I and Q components of the carrier whichrepresent the amplitude of the in-phase and quad
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