IEC 62287-2:2017

IEC 62287-2 ®
Edition 2.0 2017-02
INTERNATIONAL
STANDARD
colour
inside
Maritime navigation and radiocommunication equipment and systems – Class B
shipborne equipment of the automatic identification system (AIS) –
Part 2: Self-organising time division multiple access (SOTDMA) techniques
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IEC 62287-2 ®
Edition 2.0 2017-02
INTERNATIONAL
STANDARD
colour
inside
Maritime navigation and radiocommunication equipment and systems – Class B

shipborne equipment of the automatic identification system (AIS) –

Part 2: Self-organising time division multiple access (SOTDMA) techniques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 47.020.70 ISBN 978-2-8322-3906-3

– 2 – IEC 62287-2:2017 © IEC 2017

CONTENTS
FOREWORD . 8
1 Scope . 10
2 Normative references . 10
3 Terms, definitions and abbreviated terms . 11
3.1 Terms and definitions . 11
3.2 Abbreviated terms . 11
4 General requirements . 12
4.1 General . 12
4.1.1 Capabilities of the Class B "SO" AIS . 12
4.1.2 Quality assurance . 12
4.1.3 Safety of operation . 13
4.1.4 Additional features . 13
4.1.5 Functionality . 13
4.2 Manuals . 13
4.3 Marking and identification . 13
5 Environmental, power supply, interference and safety requirements . 13
6 Performance requirements. 14
6.1 Internal processes . 14
6.2 Operating frequency channels . 15
6.3 Internal GNSS receiver for position reporting . 15
6.4 Identification . 15
6.5 AIS Information . 15
6.5.1 Information content . 15
6.5.2 Information reporting intervals . 16
6.5.3 Short safety-related messages . 17
6.5.4 Permissible initialisation period . 17
6.6 Alarms and indications, fall-back arrangements . 17
6.6.1 Built-in integrity tests (BIIT) . 17
6.6.2 Transmitter shutdown procedure . 18
6.6.3 Position sensor fallback conditions . 19
6.7 User interface . 19
6.7.1 Indication and display . 19
6.7.2 Static data input . 20
6.7.3 External interfaces . 20
6.8 Protection from invalid control commands . 20
7 Technical requirements . 20
7.1 General . 20
7.2 Physical layer . 21
7.2.1 General . 21
7.2.2 Receiver characteristics. 21
7.2.3 Other characteristics . 22
7.2.4 Transmitter requirements . 23
7.3 Link layer . 24
7.3.1 General . 24
7.3.2 Link sub-layer 1: medium access control (MAC). 24
7.3.3 Link sub-layer 2: data link service (DLS) . 26

7.3.4 Link sub-layer 3: link management entity (LME) . 26
7.4 Network layer . 30
7.4.1 General . 30
7.4.2 Management of regional operating settings . 30
7.4.3 Multi-channel operation . 31
7.5 Transport layer . 31
7.6 Presentation interface . 32
7.7 DSC receive capability . 32
7.8 Long-range application by broadcast . 32
8 Test conditions . 32
8.1 General . 32
8.2 Normal test conditions . 32
8.2.1 Temperature and humidity . 32
8.2.2 Power supply . 33
8.3 Extreme test conditions . 33
8.4 Test signals . 33
8.4.1 Standard test signal number 1 . 33
8.4.2 Standard test signal number 2 . 33
8.4.3 Standard test signal number 3 . 33
8.4.4 Standard test signal number 4 . 33
8.5 Standard test environment . 34
8.5.1 Test setup . 34
8.5.2 Sensor test input . 35
8.5.3 Synchronisation . 35
8.5.4 Test signals applied to the receiver input . 35
8.5.5 Waiver for receivers . 35
8.5.6 Artificial antenna (dummy load) . 35
8.5.7 Modes of operation of the transmitter. 35
8.5.8 Common test conditions for protection from invalid controls . 35
8.5.9 Measurement uncertainties . 35
9 Power supply, environmental and EMC tests . 36
9.1 Test summary . 36
9.2 Vibration . 37
9.2.1 Purpose . 37
9.2.2 Method of measurement . 37
9.2.3 Required results . 38
9.3 Shock . 38
9.3.1 Purpose . 38
9.3.2 Method of measurement . 38
9.3.3 Required result . 38
9.4 Performance tests/checks . 38
9.5 Under voltage test (brown out) . 38
9.5.1 Purpose . 38
9.5.2 Method of test. 38
9.5.3 Required result . 39
9.6 Under voltage test (short term) . 39
9.6.1 Purpose . 39
9.6.2 Method of test. 39
9.6.3 Required result . 39

– 4 – IEC 62287-2:2017 © IEC 2017
10 Operational tests . 39
10.1 General . 39
10.1.1 Tests by inspection . 39
10.1.2 Safety of operation . 39
10.1.3 Additional features . 40
10.2 Modes of operation . 40
10.2.1 Autonomous mode . 40
10.2.2 Single messages . 42
10.2.3 Polled mode and interrogation response . 45
10.3 Channel selection . 45
10.3.1 Valid channels . 46
10.3.2 Invalid channels . 46
10.4 Internal GNSS receiver . 46
10.5 AIS information . 46
10.5.1 Information content . 46
10.5.2 Information update intervals . 47
10.6 Initialisation period . 49
10.6.1 Purpose . 49
10.6.2 Method of measurement . 49
10.6.3 Required results . 49
10.7 Alarms and indications, fall-back arrangements . 49
10.7.1 Built in integrity test . 49
10.7.2 Transceiver protection . 50
10.7.3 Transmitter shutdown procedure . 50
10.7.4 Position sensor fallback conditions . 50
10.8 User interface . 51
10.8.1 Status indication . 51
10.8.2 Message display . 51
10.8.3 Static data input . 52
11 Physical tests . 53
11.1 TDMA transmitter . 53
11.1.1 Frequency error . 53
11.1.2 Carrier power . 53
11.1.3 Transmission spectrum . 54
11.1.4 Modulation accuracy . 55
11.1.5 Transmitter output power versus time function . 56
11.2 TDMA receivers . 57
11.2.1 Sensitivity . 57
11.2.2 Error behaviour at high input levels. 58
11.2.3 Co-channel rejection . 58
11.2.4 Adjacent channel selectivity . 59
11.2.5 Spurious response rejection . 60
11.2.6 Intermodulation response rejection . 62
11.2.7 Blocking or desensitisation . 63
11.3 Conducted spurious emissions . 64
11.3.1 Spurious emissions from the receiver . 64
11.3.2 Spurious emissions from the transmitter . 64
12 Specific tests of link layer . 65
12.1 TDMA synchronisation . 65

12.1.1 Synchronisation test using UTC direct and indirect . 65
12.1.2 Synchronisation test without UTC, EUT receiving semaphore . 66
12.2 Time division (frame format) . 66
12.2.1 Purpose . 66
12.2.2 Method of measurement . 66
12.2.3 Required results . 66
12.3 Synchronisation jitter . 66
12.3.1 Definition . 66
12.3.2 Purpose . 67
12.3.3 Method of measurement . 67
12.3.4 Required results . 67
12.4 Data encoding (bit stuffing) . 67
12.4.1 Purpose . 67
12.4.2 Method of measurement . 67
12.4.3 Required results . 67
12.5 Frame check sequence . 67
12.5.1 Purpose . 67
12.5.2 Method of measurement . 67
12.5.3 Required results . 67
12.6 Slot allocation (channel access protocols) . 68
12.6.1 Network entry . 68
12.6.2 Autonomous scheduled transmissions (SOTDMA) . 68
12.6.3 Autonomous scheduled transmissions (ITDMA) . 68
12.6.4 Transmission of Messages 24A and 24B (ITDMA) . 68
12.6.5 Assigned operation . 69
12.6.6 Group assignment . 71
12.6.7 Base station reservations . 75
12.7 Message formats . 75
12.7.1 Received messages . 75
12.7.2 Transmitted messages . 75
13 Specific tests of network layer . 76
13.1 Regional area designation by VDL Message . 76
13.1.1 Purpose . 76
13.1.2 Method of measurement . 76
13.1.3 Required results . 77
13.2 Channel management by addressed Message 22 . 78
13.2.1 Purpose . 78
13.2.2 Method of measurement . 78
13.2.3 Required results . 78
13.3 Invalid regional operating areas . 78
13.3.1 Purpose . 78
13.3.2 Method of measurement . 78
13.3.3 Required results . 78
13.4 Continuation of autonomous mode reporting interval . 78
13.4.1 Purpose . 78
13.4.2 Method of test. 79
13.4.3 Required result . 79
13.5 Slot reuse and FATDMA reservations . 79
13.5.1 Method of measurement . 79

– 6 – IEC 62287-2:2017 © IEC 2017
13.5.2 Required results . 79
13.6 Long-range application by broadcast . 79
13.6.1 Long-range broadcast . 79
13.6.2 Multiple assignment operation . 80
13.7 Other features . 81
Annex A (normative) DSC channel management . 82
A.1 DSC functionality . 82
A.2 DSC time sharing . 82
A.3 DSC test signals . 83
A.3.1 DSC test signal number 1 . 83
A.3.2 DSC test signal number 2 . 83
A.3.3 DSC test signal number 3 . 83
A.3.4 DSC test signal number 4 . 83
A.4 DSC functionality tests . 83
A.4.1 General . 83
A.4.2 Method of measurement . 83
A.4.3 Required results . 84
A.4.4 Regional area designation . 84
A.4.5 Scheduling . 84
A.4.6 DSC flag in Message 18 . 84
A.4.7 DSC monitoring time plan . 85
A.4.8 Replacement or erasure of dated or remote regional operating settings . 85
A.4.9 Test of addressed telecommand . 86
A.4.10 Invalid regional operating areas . 86
A.5 DSC receiver tests . 86
A.5.1 General . 86
A.5.2 Maximum sensitivity. 87
A.5.3 Error behaviour at high input levels. 87
A.5.4 Co-channel rejection . 87
A.5.5 Adjacent channel selectivity . 88
A.5.6 Spurious response rejection . 88
A.5.7 Inter-modulation response rejection . 88
A.5.8 Blocking or desensitisation . 89
Annex B (normative) Calculation of area size . 90
B.1 Importance of a common method for area size . 90
B.2 Calculation of area sizes . 90
Annex C (informative) Digital interface sentence to parameter group number
equivalence . 91
Bibliography . 92

Figure 1 – OSI layer model . 21
Figure 2 – Power versus time mask . 25
Figure 3 – Format for repeating four-packet cluster . 33
Figure 4 – Measurement arrangement for carrier power . 53
Figure 5 – Emission mask . 55
Figure 6 – Measurement arrangement for modulation accuracy . 55
Figure 7 – Measurement arrangement . 57
Figure 8 – Measurement arrangement with two generators . 58

Figure 9 – SINAD or PER/BER measuring equipment . 61
Figure 10 – Measurement arrangement for intermodulation . 62
Figure 11 – Regional transitional zones . 77

Table 1 – Dynamic information autonomous reporting intervals for Class B "SO" AIS . 16
Table 2 – BIIT and reaction to malfunctions . 18
Table 3 – Position sensor fallback conditions . 19
Table 4 – Required receiver performance . 22
Table 5 – Transceiver characteristics . 22
Table 6 – Transmitter characteristics . 24
Table 7 – Definitions of timing for Figure 2 . 26
Table 8 – Use of VDL Messages by a Class B "SO" AIS . 29
Table 9 – Content of first two packets . 34
Table 10 – Fixed PRS data derived from ITU-T O.153. 34
Table 11 – Test . 37
Table 12 – Peak frequency deviation versus time. 56
Table 13 – Frequencies for intermodulation test . 63
Table 14 – Regional area scenario . 77
Table 15 – Required channels in use . 77
Table A.1 – DSC monitoring times . 83
Table B.1 – Coordinate points . 90
Table C.1 – Digital sentence to PGN equivalence . 91

– 8 – IEC 62287-2:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MARITIME NAVIGATION AND RADIOCOMMUNICATION
EQUIPMENT AND SYSTEMS – CLASS B SHIPBORNE EQUIPMENT
OF THE AUTOMATIC IDENTIFICATION SYSTEM (AIS) –

Part 2: Self-organising time division multiple access
(SOTDMA) techniques
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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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.
International Standard IEC 62287-2 has been prepared by IEC technical
committee 80: Maritime navigation and radiocommunication equipment and systems.
This second edition cancels and replaces the first edition published in 2013. It constitutes a
technical revision.
This edition includes the following significant technical change with respect to the previous
edition: the introduction of transmission of Message 27 on channels 75 and 76 for the long
range application by broadcast.

The text of this document is based on the following documents:
FDIS Report on voting
80/827/FDIS 80/836/RVD
Full information on the voting for the approval of this document can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 62287 series, published under the general title Maritime
navigation and radiocommunication and systems – Class B shipborne equipment of the
automatic identification system (AIS), can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 10 – IEC 62287-2:2017 © IEC 2017
MARITIME NAVIGATION AND RADIOCOMMUNICATION
EQUIPMENT AND SYSTEMS – CLASS B SHIPBORNE EQUIPMENT
OF THE AUTOMATIC IDENTIFICATION SYSTEM (AIS) –

Part 2: Self-organising time division multiple access
(SOTDMA) techniques
1 Scope
This part of IEC 62287 specifies operational and performance requirements, methods of
testing and required test results for Class B "SO" shipborne automatic identifications system
(AIS) equipment using self-organising time division multiple access (SOTDMA) techniques as
described in Recommendation ITU-R M.1371. This document takes into account other
associated IEC International Standards and existing national standards, as applicable.
The main differences between Class B "CS" (IEC 62287-1) and Class B "SO" units are that
the Class B "SO"
• covers all 25 kHz channels listed in Recommendation ITU-R M.1084-5,
• only uses the internal GNSS – no position sensor input is allowed,
• requires use of VDL Message 17 for correction of the internal GNSS,
• requires a presentation interface,
• has additional reporting intervals, down to 5 s,
• has two power settings, with a high level of 5 W, and
• has the capability to transmit binary messages.
This document is applicable for AIS equipment used on craft that are not covered by a
mandatory carriage requirement of AIS under SOLAS Chapter V.
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) applies.
IEC 60945:2002, Maritime navigation and radiocommunication equipment and systems –
General requirements – Methods of testing and required test results
IEC 61108 (all parts), Maritime navigation and radiocommunication equipment and systems –
Global navigation satellite systems (GNSS)
IEC 61108-4, Maritime navigation and radiocommunication equipment and systems – Global
navigation satellite systems (GNSS) – Part 4: Shipborne DGPS and DGLONASS maritime
radio beacon receiver equipment – Performance requirements, methods of testing and
required test results
IEC 61162-1, Maritime navigation and radiocommunication equipment and systems – Digital
interfaces – Part 1: Single talker and multiple listeners

IEC 61993-2, Maritime navigation and radio communication equipment and systems –
Automatic identification systems (AIS) – Part 2: Class A shipborne equipment of the automatic
identification system (AIS) – Operational and performance requirements, methods of test and
required test results
ITU Radio regulations:2012
ITU-R Recommendation M.825-3:1998, Characteristics of a transponder system using digital
selective calling techniques for use with vessel traffic services and ship-to-ship identification
ITU-R Recommendation M.1084-5:2012, Interim solutions for improved efficiency in the use of
the band 156-174 MHz by stations in the maritime mobile service
ITU-R Recommendation M.1371-5:2014, Technical characteristics for an automatic
identification system using time division multiple access in the VHF maritime mobile band
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.2 Abbreviated terms
AIS automatic identification system
BER bit error rate
BIIT built-in integrity tests
BT bandwidth time
COG course over ground
CRC cyclic redundancy check
CSD compass safe distance
DGNSS differential global navigation satellite service
DLS data link service
DSC digital selective calling
EUT equipment under test
FM frequency mod
...