Radio data system (RDS) - VHF/FM sound broadcasting in the frequency range from 64,0 MHz to 108,0 MHz - Part 2: Message format: coding and definition of RDS features

IEC 62106-2:2021 is available as IEC 62106-2:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 62106-8:2021 defines the coding and definition of features for the Radio Data System (RDS). IEC 62106-8:2021 cancels and replaces the first edition published in 2018. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC 62106‑2:2018:
a) Subclause 4.2.4 has been added;
b) Tables 1 and 13 have been modified;
c) The new function RDS2 file transfer has been added and it is detailed in Annex C; this uses a CRC-16, which is specified in Annex D.

General Information

Status
Published
Publication Date
21-Feb-2021
Current Stage
PPUB - Publication issued
Completion Date
22-Feb-2021
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IEC 62106-2:2021 - Radio data system (RDS) - VHF/FM sound broadcasting in the frequency range from 64,0 MHz to 108,0 MHz - Part 2: Message format: coding and definition of RDS features
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IEC 62106-2
Edition 2.0 2021-02
INTERNATIONAL
STANDARD
Radio data system (RDS) – VHF/FM sound broadcasting in the frequency range
from 64,0 MHz to 108,0 MHz –
Part 2: Message format: coding and definitions of RDS features
IEC 62106-2:2021-02(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62106-2
Edition 2.0 2021-02
INTERNATIONAL
STANDARD
Radio data system (RDS) – VHF/FM sound broadcasting in the frequency range
from 64,0 MHz to 108,0 MHz –
Part 2: Message format: coding and definitions of RDS features
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.40 ISBN 978-2-8322-9426-0

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 62106-2:2021 © IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 6

INTRODUCTION ..................................................................................................................... 8

1 Scope .............................................................................................................................. 9

2 Normative references ...................................................................................................... 9

3 Terms, definitions, abbreviated terms and conventions .................................................... 9

3.1 Terms and definitions .............................................................................................. 9

3.2 Abbreviated terms ................................................................................................... 9

3.3 Notation and conventions ...................................................................................... 11

4 Message format ............................................................................................................. 11

4.1 Design principles .................................................................................................. 11

4.2 Group structure ..................................................................................................... 12

4.2.1 Group type A structure ................................................................................... 12

4.2.2 Group type B structure ................................................................................... 13

4.2.3 Group type C structure .................................................................................. 13

4.2.4 RFT ODA pipe/channel .................................................................................. 14

4.3 Group type A and B usage .................................................................................... 15

4.4 Group type C usage .............................................................................................. 16

4.4.1 Transmitting legacy data using data-streams 1, 2 and 3................................. 16

4.4.2 Transmitting group type C ODA data ............................................................. 16

4.4.3 AID and channel number assignment for group type C ODAs......................... 17

5 Description of the RDS features..................................................................................... 18

5.1 Alternative Frequencies list (AFs) ......................................................................... 18

5.2 Clock Time and date (CT) ..................................................................................... 18

5.3 Dynamic PTY Indicator (PTYI) using DI ................................................................. 18

5.4 Extended Country Code (ECC) ............................................................................. 18

5.5 Enhanced Other Networks information (EON) ....................................................... 18

5.6 Linkage information .............................................................................................. 19

5.7 Open Data Applications (ODAs) ............................................................................ 19

5.8 Programme Identification (PI)................................................................................ 19

5.9 Programme Service name – (PS) .......................................................................... 20

5.10 Long Programme Service name – (LPS) ............................................................... 20

5.11 Programme Type (PTY) ........................................................................................ 20

5.12 Programme Type Name (PTYN) ............................................................................ 20

5.13 RadioText (RT) ..................................................................................................... 21

5.14 enhanced RadioText (eRT) ................................................................................... 21

5.15 RadioText Plus (RT+ and eRT+) ........................................................................... 21

5.16 Traffic Programme identification (TP) .................................................................... 21

5.17 Traffic Announcement identification (TA) ............................................................... 21

5.18 Traffic Message Channel (TMC) ............................................................................ 22

6 Coding of the group types .............................................................................................. 22

6.1 Groups of type 0A and 0B: Basic tuning and switching information with PS

name .................................................................................................................... 22

6.2 Group type 1A: Slow labelling codes ..................................................................... 23

6.3 Group type 2A and 2B: RadioText ......................................................................... 24

6.4 Group type 3A: Application identification for any specific ODA using groups

of type A or B ........................................................................................................ 25

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IEC 62106-2:2021 © IEC 2021 – 3 –

6.5 Group type 4A: Clock-Time and date..................................................................... 25

6.6 Group type 10A: Programme Type Name PTYN .................................................... 26

6.7 Group type 14A and B: Enhanced Other Networks information (EON) ................... 27

6.8 Group type 15A: Long Programme Service name – 32 bytes with UTF-8

coding ................................................................................................................... 27

6.9 Group type 15B: Fast basic tuning and switching information ................................ 28

7 Coding of RDS features for control ................................................................................ 29

7.1 Programme Identification (PI) codes and Extended Country Codes (ECC) ............ 29

7.1.1 PI structure .................................................................................................... 29

7.1.2 Country Identifier (CI) codes: 'Nibble 1' .......................................................... 29

7.1.3 Extended Country Codes (ECC) .................................................................... 29

7.1.4 Programme service in terms of area coverage (codes for fixed location

transmitters only): 'Nibble 2' .......................................................................... 30

7.1.5 Programme reference number: 'Nibbles 3 and 4' ............................................ 30

7.1.6 PI codes for low-power short range transmitting devices ................................ 30

7.2 Programme Type (PTY) codes .............................................................................. 31

7.3 Traffic Programme (TP) and Traffic Announcement (TA) codes ............................. 31

7.4 Decoder Identification (DI) and dynamic PTY Indicator (PTYI) codes .................... 31

7.5 Coding of Alternative Frequencies (AFs) ............................................................... 32

7.5.1 AF code tables .............................................................................................. 32

7.5.2 Use of Alternative Frequencies in group type 0A............................................ 34

7.5.3 Use of AF codes in group type 14A ................................................................ 36

7.6 Coding of Enhanced Other Networks information (EON) ....................................... 37

7.6.1 General ......................................................................................................... 37

7.6.2 Coding of frequencies for cross-referenced programme services in EON ....... 38

7.6.3 Use of the TP and TA features with EON ....................................................... 38

7.6.4 Use of PTY with EON .................................................................................... 38

8 Required main RDS feature repetition rates on data-stream 0 ....................................... 39

Annex A (normative) Method for linking RDS programme services – Linkage

information – Group type 1A and 14A ................................................................................... 44

A.1 General ................................................................................................................. 44

A.2 LA – Linkage Actuator ........................................................................................... 45

A.3 EG – Extended Generic indicator .......................................................................... 45

A.4 ILS – International Linkage Set indicator ............................................................... 45

A.5 LSN – Linkage Set Number ................................................................................... 45

Annex B (informative) Conversion between time and date conventions ................................ 47

Annex C (normative) RDS2 File Transfer protocol RFT for files up to 163 kB ....................... 49

C.1 Group coding of the ODA-AID assignment groups ................................................. 49

C.1.1 General principles ......................................................................................... 49

C.1.2 Variant 0 ........................................................................................................ 49

C.1.3 Variant 1 ........................................................................................................ 50

C.1.4 Variants 2 to 15 ............................................................................................. 51

C.2 Coding of the RFT data group used to carry the file data bytes ............................. 51

Annex D (informative) CRC-16 ITU-T/CCITT checkword calculation ..................................... 53

D.1 General ................................................................................................................. 53

D.2 PASCAL listing of CRC-16-calculation routine ....................................................... 53

D.3 C listing of the CRC-16 calculation routine ............................................................ 53

D.4 Fictitious example ................................................................................................. 54

Bibliography .......................................................................................................................... 55

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– 4 – IEC 62106-2:2021 © IEC 2021

Figure 1 – Group type A structure ......................................................................................... 12

Figure 2 – Group type B structure ......................................................................................... 13

Figure 3 – Group type C structure ......................................................................................... 13

Figure 4 – Tunnelling structure for group types A and B ........................................................ 16

Figure 5 – Basic tuning and switching information – Group type 0A ...................................... 22

Figure 6 – Basic tuning and switching information – Group type 0B ...................................... 23

Figure 7 – Slow labelling codes – Group type 1A .................................................................. 23

Figure 8 – RadioText – Group type 2A .................................................................................. 24

Figure 9 – RadioText – Group type 2B .................................................................................. 25

Figure 10 – Application identification for any specific ODA – Group type 3A ......................... 25

Figure 11 – Clock-Time and date transmission – Group type 4A ........................................... 26

Figure 12 – Programme Type Name PTYN – Group type 10A ............................................... 26

Figure 13 – Enhanced Other Networks information – Group type 14A ................................... 27

Figure 14 – Enhanced Other Networks information – Group type 14B ................................... 27

Figure 15 – Long PS, UTF-8 coded – Group type 15A ........................................................... 28

Figure 16 – Fast basic tuning and switching information – Group type 15B ........................... 28

Figure 17 – PI code structure ................................................................................................ 29

Figure A.1 – Structure of group type 1A, block 3 ................................................................... 44

Figure A.2 – Structure of group type 14A variant 12, block 3 (Linkage information) –

National link .......................................................................................................................... 45

Figure A.3 – Structure of group type 14A variant 12, block 3 (Linkage information) –

International link ................................................................................................................... 46

Figure B.1 – Conversion routes between Modified Julian Date (MJD) and Coordinated

Universal Time (UTC) ........................................................................................................... 47

Figure C.1 – AID assignment group coding for variant 0........................................................ 49

Figure C.2 – AID assignment group coding for variant 1........................................................ 51

Figure C.3 – AID assignment group coding for variant 2 to 15 ............................................... 51

Figure C.4 – RFT data group ................................................................................................ 52

Table 1 – Group type C Function Header definition ............................................................... 14

Table 2 – Group type A and B usage .................................................................................... 15

Table 3 – Group type C assignment methods used to connect channel numbers with

one or more AIDs .................................................................................................................. 17

Table 4 – Assignment of up to three successive channel numbers to multiple AIDs............... 18

Table 5 – Area coverage codes ............................................................................................. 30

Table 6 – Programme service reference number codes ......................................................... 30

Table 7 – PI codes for short range transmitting devices ........................................................ 31

Table 8 – Codes for TP and TA ............................................................................................. 31

Table 9 – Meaning of bits d to d ........................................................................................ 32

0 3

Table 10 – VHF frequencies 87,6 MHz to 107,9 MHz code table ........................................... 32

Table 11 – Special meanings AF code table .......................................................................... 33

Table 12 – LF/MF code table – ITU regions 1 and 3 (9 kHz spacing) ..................................... 33

Table 13 – MF code table – ITU region 2 (10 kHz spacing) ................................................... 33

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IEC 62106-2:2021 © IEC 2021 – 5 –

Table 14 – Example including AFs for the extended FM Band ............................................... 37

Table 15 – Data-stream 0 group repetition rates: Transmitter not part of a

multi-programme service network: no TMC and only 'basic' RDS features ............................. 39

Table 16 – Data-stream 0 group repetition rates: Transmitter part of a multi-programme

service network: no TMC ...................................................................................................... 40

Table 17 – Data-stream 0 group repetition rates: Transmitter not part of a multi-

programme service network: with TMC ................................................................................. 41

Table 18 – Data-stream 0 group repetition rates: Transmitter not part of a multi-

programme service network: no TMC and with support for UTF-8 coded characters .............. 42

Table 19 – Data-stream 0 group repetition rates: Transmitter part of a multi-programme

service network: with TMC .................................................................................................... 43

Table B.1 – Symbols used for time and date calculation........................................................ 47

Table C.2 – Relation between chunk size, max. file size and max.chunk address ................. 50

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– 6 – IEC 62106-2:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RADIO DATA SYSTEM (RDS) –
VHF/FM SOUND BROADCASTING IN THE FREQUENCY
RANGE FROM 64,0 MHz TO 108,0 MHz –
Part 2: Message format: coding and definitions of RDS features
FOREWORD

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

IEC 62106-2 has been prepared by technical area 1: Terminals for audio, video and data

services and contents, of IEC technical committee 100: Audio, video and multimedia systems

and equipment. It is an International Standard.

This second edition cancels and replaces the first edition published in 2018. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to

IEC 62106‑2:2018:
a) Subclause 4.2.4 has been added;
b) Tables 1 and 13 have been modified;

c) The new function RDS2 file transfer has been added and it is detailed in Annex C; this uses

a CRC-16, which is specified in Annex D.
---------------------- Page: 8 ----------------------
IEC 62106-2:2021 © IEC 2021 – 7 –
The text of this International Standard is based on the following documents:
CDV Report on voting
100/3464/CDV 100/3547/RVC

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.

A list of all parts in the IEC 62106 series, published under the general title Radio data

system (RDS) – VHF/FM sound broadcasting in the frequency range from 64,0 MHz to
108,0 MHz, can be found on the IEC website.
The language used for the development of this International Standard is English,

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under webstore.iec.ch in the data related to the

specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 9 ----------------------
– 8 – IEC 62106-2:2021 © IEC 2021
INTRODUCTION

Since the mid-1980s, a fascinating development has taken place. Most of the multimedia

applications and standards have been created or redefined significantly. Hardware has become

extremely powerful with dedicated software and middleware. In the mid-1980s, Internet as well

as its protocols did not exist. Navigation systems became affordable in the late 1990s, and a

full range of attractive smartphones now exist. The computing power of all these new products

is comparable with that of the mainframe installations in that era.

Listener expectations have grown faster than the technology. Visual experience is now very

important, like the Internet look and feel. Scrolling text or delivering just audio is nowadays

perceived as insufficient for FM radio, especially for smartphone users. New types of radio

receivers with added value features are therefore required. RDS has so far proven to be very

successful.

FM radio with RDS is an analogue-digital hybrid system, which is still a valid data transmission

technology and only the applications need adaptation. Now the time has come to solve the only

disadvantage, the lack of sufficient data capacity. With RDS2, the need to increase the data

capacity can be fulfilled.

RDS was introduced in the early 1980s. During the introductory phase in Europe, the car

industry became very involved and that was the start of an extremely successful roll-out. Shortly

afterwards, RDS (RBDS) was launched in the USA [1, 2, 3, 4, 5]

The RDS Forum has investigated a solution to the issue of limited data capacity. For RDS2,

both sidebands around the RDS 57 kHz subcarrier can be repeated a few times, up to three,

centred on additional subcarriers higher up in the FM multiplex while still remaining compatible

with the ITU Recommendations.

The core elements of RDS2 are the additional subcarriers, which will enable a significant

increase of RDS data capacity to be achieved, and then only new additional data applications

will have to be created, using the RDS-ODA feature, which has been part of the RDS standard

IEC 62106 for many years.

In order to update IEC 62106:2015 to the specifications of RDS2, IEC 62106 has been

restructured as follows:
Part 1: Modulation characteristics and baseband coding
Part 2: RDS message format, coding and definition of RDS features
Part 3: Usage and registration of Open Data Applications ODAs
Part 4: Registered code tables
Part 5: Marking of RDS and RDS2 devices

Part 6: Compilation of technical specifications for Open Data Applications in the public domain

Part 9: RBDS – RDS variant used in North America
Part 10: Universal Encoder Communication Protocol UECP
The original specifications of the RDS system have been maintained and the extra
functionalities of RDS2 have been added.

The presentation in Parts 1, 2 and 3 follows the OSI basic reference model for information

processing systems [6].
_______________
Numbers in square brackets refer to the Bibliography.
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IEC 62106-2:2021 © IEC 2021 – 9 –
RADIO DATA SYSTEM (RDS) –
VHF/FM SOUND BROADCASTING IN THE FREQUENCY
RANGE FROM 64,0 MHz TO 108,0 MHz –
Part 2: Message format: coding and definitions of RDS features
1 Scope

This part of IEC 62106 defines the coding and definition of features for the Radio Data System

(RDS).
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any

amendments)
...

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