ETSI TS 102 759 V1.1.1 (2008-10)

Digital Radio Mondiale (DRM); AMSS Distribution Interface (ASDI)

DTS/JTC-DRM-18

General Information

• Status: Published
• Publication Date: 16-Oct-2008
• Technical Committee: BROADCAS - EBU/CENELEC/ETSI on Broadcasting
• Current Stage: 12 - Completion
• Due Date: 20-Oct-2008
• Completion Date: 17-Oct-2008

Standards Content (Sample)

ETSI TS 102 759 V1.1.1 (2008-10)
Technical Specification


Digital Radio Mondiale (DRM);
AMSS Distribution Interface (ASDI)


European Broadcasting Union Union Européenne de Radio-Télévision
EBU·UER

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2 Draft ETSI TS 102 759 V1.1.1 (2008-10)



Reference
DTS/JTC-DRM-18
Keywords
broadcasting, digital, DRM, radio, AM
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© European Telecommunications Standards Institute 2008.
© European Broadcasting Union 2008.
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3 Draft ETSI TS 102 759 V1.1.1 (2008-10)
Contents
Intellectual Property Rights . 4
Foreword . 4
Introduction . 4
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 6
3 Definitions, symbols, abbreviations and conventions . 7
3.1 Definitions . 7
3.2 Symbols . 8
3.3 Abbreviations . 8
3.4 Conventions . 9
4 General description. 9
4.1 System overview . 9
4.2 System architecture . 9
5 TAG Items . 10
5.1 Mandatory TAG Items . 11
5.1.1 Protocol type and revision (*ptr) . 11
5.1.2 ASDI Sequence Number (assn) . 11
5.1.3 AMSS block (ablk) . 12
5.1.4 ASDI asynchronous reset (arst) . 12
5.2 Optional TAG Items . 13
5.2.1 ASDI timestamp (atst) . 13
5.3 Revision history . 14
Annex A (informative): AMSS data structure . 15
Annex B (normative): ASDI Profiles . 16
Annex C (normative): Muting Mechanism . 17
C.1 Muting . 17
Annex D (informative): ASDI Timestamps . 18
D.1 Relationships . 18
D.2 Rationale . 18
Annex E (normative): Physical presentation . 19
History . 20

ETSI

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4 Draft ETSI TS 102 759 V1.1.1 (2008-10)
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 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
server (http://webapp.etsi.org/IPR/home.asp).
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 become, 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), Comité Européen de Normalisation ELECtrotechnique (CENELEC) and the European
Telecommunications Standards Institute (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 responsible 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 about
60 countries in the European broadcasting area; its headquarters is in Geneva.
European Broadcasting Union
CH-1218 GRAND SACONNEX (Geneva)
Switzerland
Tel: [phone]
Fax: [phone]

Introduction
The frequency bands used for broadcasting below 30 MHz are:
• Low Frequency (LF) band - from 148,5 KHz to 283,5 KHz, in ITU Region 1 [1] only;
• Medium Frequency (MF) band - from 526,5 KHz to 1 606,5 KHz, in ITU Regions 1 [1] and 3 [1] and from
525 KHz to 1 705 KHz in ITU Region 2 [1];
• High Frequency (HF) bands - a set 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 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.
There is thus a desire to continue broadcasting in these bands, perhaps especially in 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.
ETSI

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5 Draft ETSI TS 102 759 V1.1.1 (2008-10)
However, broadcasting services in these bands:
• use analogue techniques;
• are subject to limited quality;
• are subject to considerable interference 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 provide 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 bands below 30 MHz, the Digital
Radio Mondiale (DRM) [2] 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 and research institutes. More information is available from their
website (http://www.drm.org/).
The AM Signalling System (AMSS) [3] adds a limited amount of service information to analogue broadcasts in the
frequency bands below 30 MHz in a complementary way to the Digital Radio Mondiale (DRM) system. It is intended to
be used by broadcasters in the transition to all digital transmission by providing labelling and frequency information for
a better user experience.
ETSI

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6 Draft ETSI TS 102 759 V1.1.1 (2008-10)
1 Scope
The present document gives the specification of the link between an AMSS generator and an AMSS modulator.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• Non-specific reference may be made only to a complete document or a part thereof and only in the following
cases:
- if it is accepted that it will be possible to use all future changes of the referenced document for the
purposes of the referring document;
- for informative references.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
For online referenced documents, information sufficient to identify and locate the source shall be provided. Preferably,
the primary source of the referenced document should be cited, in order to ensure traceability. Furthermore, the
reference should, as far as possible, remain valid for the expected life of the document. The reference shall include the
method of access to the referenced document and the full network address, with the same punctuation and use of upper
case and lower case letters.
NOTE: While any hyperlinks 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 indispensable for the application of the present document. For dated
references, only the edition cited applies. For non-specific references, the latest edition of the referenced document
(including any amendments) applies.
[1] ITU-R Radio Regulations.
[2] ETSI ES 201 980: "Digital Radio Mondiale (DRM); System Specification".
[3] ETSI TS 102 386: "Digital Radio Mondiale (DRM); AM Signalling System (AMSS)".
[4] ETSI TS 102 820: "Digital Radio Mondiale (DRM); Multiplex Distribution Interface (MDI)".
[5] ETSI TS 102 821: "Digital Radio Mondiale (DRM); Distribution and Communications
Protocol (DCP)".
[6] ETSI TS 102 358: "Digital Radio Mondiale (DRM); Specific Restrictions for the use of the
Distribution and Communication Protocol (DCP)".
2.2 Informative references
The following referenced documents are not essential to the use of the present document but they assist the user with
regard to a particular subject area. For non-specific references, the latest version of the referenced document (including
any amendments) applies.
Not applicable.
ETSI

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7 Draft ETSI TS 102 759 V1.1.1 (2008-10)
3 Definitions, symbols, abbreviations and conventions
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
Alternative Frequency Signalling (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
AMSS block: 47 bits containing AMSS data
AMSS group: 94 bits consisting of the two types of AMSS blocks, Block 1 and Block 2
byte: collection of 8 bits
Coordinated Universal Time (literally Universel Temps Coordonné) (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 1st 1972 (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 November 2007 there have been 23 leap seconds, all positive, making TAI = UTC + 33.
Data Entity Group: collection of DRM SDC data entities, protected by a 16-bit Cyclic Redundancy Check
Distribution and Communication Protocol (DCP): transport layer communications protocol providing fragmentation,
addressing and/or reliable data transmission over errored channels using a Reed Solomon code to provide Forward
Error Correction (FEC)
dynamic information: AMSS information that cannot be sensibly cached by an AMSS modulator for later
transmission because it would be out of date, for example the time and date
Global Position System (GPS): constellation of satellites providing accurate time and position information to receivers
GPS Time: time signal broadcast by the GPS satellites using an epoch of January 6th 1980 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)
Greenwich Mean Time (GMT): historically the standard time for all international applications, now superseded by
UTC
International Atomic Time (literally Temps Atomique International) (TAI): time format counting in standard SI
seconds
NOTE: TAI and GPS Time have a constant offset of 19 s.
Modified Julian Date (MJD): date format based on the number of days since midnight GMT on
th
17 November 1858 AD
NOTE: Time can 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 using different radio
frequencies to achieve improved reliability of reception
Offset Word: sequence of bits applied to a Cyclic Redundancy Check which breaks the cyclic property of the check
and allows an AMSS receiver to perform Block synchronization
SDC Data Entity: part of the SDC which contains a specific type of information such as alternative frequency or
region information
Service Description Channel (SDC): channel within the DRM multiplex that gives information necessary to decode
the services included in the multiplex.
ETSI

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8 Draft ETSI TS 102 759 V1.1.1 (2008-10)
Single Frequency Network (SFN): network of transmitters sharing the same radio frequency to cover an area
static information: AMSS information that could be cached by an AMSS modulator for later transmission as it is
generally static in nature such as the service label or the language
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
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
3.2 Symbols
For the purposes of the present document, the following symbols apply:
n An item that can be repeated multiple, n, times
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AFS Alternative Frequency Signalling
AM Amplitude Modulation
AMSS AM Signalling System
ASDI AMSS Distribution Interface
BOOTP BOOT Protocol
CRC Cyclic Redundancy Check
DCP Distribution and Communication Protocol
DEG Data Entity Group
DHCP Dynamic Host Configuration Protocol
DRM Digital Radio Mondiale
FEC Forward Error Correction
GMT Greenwich Mean Time
GPS Global Positioning System
HF High Frequency
IP Internet Protocol
LF Low Frequency
LSb Least Significant bit
MDI Multiplex Distribution Interface
MF Medium Frequency
MFN Multi-Frequency Network
MJD Modified Julian Date
MSb Most Significant bit
RF Radio Frequency
rfu reserved for future use
SDC Service Description Channel
SFN Single Frequency Network
SMFN Synchronized Multi-Frequency Network
TAG Tag, Length, Value
TAI International Atomic Time (Temps Atomique International)
UDP User Datagram Protocol
UTC Coordinated Universal Time (Universel Temps Coordonné)
ETSI

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9 Draft ETSI TS 102 759 V1.1.1 (2008-10)
3.4 Conventions
The order of bits and bytes within each description shall use the following notation unless otherwise stated:
• in figures, the bit or byte shown in the left hand position is considered to be first;
• in tables, the bit or byte shown in the left hand position is considered to be first;
• in byte fields, the Most Significant bit (MSb) is considered to be first and denoted by the higher number. For
example, the MSb of a single byte is denoted "b7" and the Least S
...