IEC 62287-1:2017

IEC 62287-1 ®
Edition 3.0 2017-04
INTERNATIONAL
STANDARD
colour
inside
Maritime navigation and radiocommunication equipment and systems – Class B
shipborne equipment of the automatic identification system (AIS) –
Part 1: Carrier-sense time division multiple access (CSTDMA) techniques

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

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latest edition, a corrigenda or an amendment might have been published.

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IEC 62287-1 ®
Edition 3.0 2017-04
INTERNATIONAL
STANDARD
colour
inside
Maritime navigation and radiocommunication equipment and systems – Class B

shipborne equipment of the automatic identification system (AIS) –

Part 1: Carrier-sense time division multiple access (CSTDMA) techniques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 47.020.70 ISBN 978-2-8322-4152-3

– 2 – IEC 62287-1:2017  IEC 2017
CONTENTS
FOREWORD . 8
INTRODUCTION . 10
1 Scope . 11
2 Normative references . 11
3 Terms, definitions and abbreviated terms . 12
3.1 Terms and definitions . 12
3.2 Abbreviated terms . 12
4 General requirements . 13
4.1 General . 13
4.1.1 Capabilities of the Class B "CS" AIS . 13
4.1.2 Quality assurance . 13
4.1.3 Safety of operation . 14
4.1.4 Additional features . 14
4.1.5 Modes of operation . 14
4.2 Manuals . 15
4.3 Marking and identification . 15
5 Environmental, power supply, interference and safety requirements . 15
6 Performance requirements. 16
6.1 Composition . 16
6.2 Operating frequency channels . 16
6.3 GNSS receiver for position reporting . 16
6.4 Identification . 17
6.5 AIS information . 17
6.5.1 Information content . 17
6.5.2 Information reporting intervals . 18
6.5.3 Permissible initialisation period . 18
6.6 Alarms and indications, fall-back arrangements . 18
6.6.1 Integrity and protection . 18
6.6.2 Transmitter shutdown procedure . 19
6.6.3 Position sensor fallback conditions . 19
6.6.4 SOG/COG sensor fallback conditions . 20
6.7 User interface . 20
6.7.1 Indicators and display . 20
6.7.2 Static data input . 20
6.7.3 External interfaces . 20
6.8 Protection from invalid control commands . 21
7 Technical requirements . 21
7.1 General . 21
7.2 Physical layer . 22
7.2.1 General . 22
7.2.2 Transceiver characteristics . 22
7.2.3 Transmitter requirements . 24
7.2.4 Receiver requirements . 24
7.3 Link layer . 25
7.3.1 General . 25

7.3.2 Link sublayer 1: Medium access control (MAC) . 25
7.3.3 Link sublayer 2: Data Link Service (DLS) . 28
7.3.4 Link sublayer 3: Link management entity (LME) . 33
7.4 Network layer . 41
7.4.1 General . 41
7.4.2 Dual channel operation . 41
7.4.3 Channel management . 42
7.4.4 Distribution of transmission packets . 42
7.4.5 Data link congestion resolution . 42
7.5 Transport layer . 42
7.5.1 General . 42
7.5.2 Transmission packets . 43
7.5.3 Sequencing of data packets . 43
7.6 Digital selective calling (DSC) . 43
8 Test conditions . 43
8.1 General . 43
8.2 Normal and extreme test conditions . 43
8.2.1 Normal test conditions . 43
8.2.2 Extreme test conditions . 43
8.3 Test signals . 43
8.3.1 Standard test signal number 1 . 44
8.3.2 Standard test signal number 2 . 44
8.3.3 Standard test signal number 3 . 44
8.3.4 Standard test signal number 4 . 44
8.3.5 Standard test signal number 5 . 44
8.4 Test arrangements . 45
8.4.1 Standard test environment . 45
8.4.2 Modes of operation of the transmitter. 46
8.4.3 Common test conditions for protection from invalid controls . 46
8.4.4 Measurement uncertainties . 46
9 Power supply, environmental and EMC tests . 47
9.1 Test summary . 47
9.2 Vibration/shock . 49
9.2.1 Vibration . 49
9.2.2 Shock . 49
9.3 Performance tests/checks . 49
9.4 Undervoltage test (brown out) . 50
9.4.1 Purpose . 50
9.4.2 Method of test. 50
9.4.3 Required result . 50
10 Operational tests . 50
10.1 General . 50
10.1.1 Quality assurance . 50
10.1.2 Safety of operation . 50
10.1.3 Additional features . 50
10.2 Modes of operation . 51
10.2.1 Autonomous mode . 51
10.2.2 Assigned mode . 52
10.2.3 Polled mode/interrogation response . 53

– 4 – IEC 62287-1:2017  IEC 2017
10.3 Messages extending one time period . 54
10.3.1 Method of measurement . 54
10.3.2 Required results . 54
10.4 Channel selection . 54
10.4.1 Valid channels . 54
10.4.2 Invalid channels . 54
10.5 Internal GNSS receiver . 54
10.6 AIS information . 55
10.6.1 Information content . 55
10.6.2 Information update rates . 56
10.7 Initialisation period . 57
10.7.1 Method of measurement . 57
10.7.2 Required results . 57
10.8 Alarms and indications, fall-back arrangements . 57
10.8.1 Built-in integrity test . 57
10.8.2 Transceiver protection . 58
10.8.3 Transmitter shutdown procedure . 58
10.8.4 Position sensor fallback conditions . 58
10.8.5 Speed sensors . 59
10.9 User interface . 59
10.9.1 Display . 59
10.9.2 Message display . 59
10.9.3 Static data input . 60
10.9.4 External interfaces . 60
11 Physical tests . 60
11.1 TDMA transmitter . 60
11.1.1 Frequency error . 60
11.1.2 Carrier power . 61
11.1.3 Transmission spectrum . 61
11.1.4 Modulation accuracy . 62
11.1.5 Transmitter output power versus time function . 63
11.2 TDMA receivers . 64
11.2.1 Sensitivity . 64
11.2.2 Error behaviour at high input levels. 65
11.2.3 Co-channel rejection . 65
11.2.4 Adjacent channel selectivity . 66
11.2.5 Spurious response rejection . 67
11.2.6 Intermodulation response rejection . 69
11.2.7 Blocking or desensitisation . 70
11.3 Conducted spurious emissions . 71
11.3.1 Spurious emissions from the receiver . 71
11.3.2 Spurious emissions from the transmitter . 72
12 Specific tests of link layer . 72
12.1 TDMA synchronisation . 72
12.1.1 Synchronisation test sync mode 1 . 72
12.1.2 Synchronisation test sync mode 2 . 73
12.1.3 Synchronisation test with UTC . 74
12.2 Carrier-sense tests . 74
12.2.1 Threshold level . 74

12.2.2 Carrier-sense timing . 75
12.3 VDL state/reservations . 76
12.3.1 Method of measurement . 76
12.3.2 Required results . 76
12.4 Data encoding (bit stuffing) . 76
12.4.1 Method of measurement . 76
12.4.2 Required results . 76
12.5 Frame check sequence . 76
12.5.1 Method of measurement . 76
12.5.2 Required results . 76
12.6 Slot allocation (channel access protocol) . 77
12.6.1 Autonomous mode allocation . 77
12.6.2 DSC listening periods . 77
12.7 Assigned operation . 77
12.7.1 Assignment priority . 77
12.7.2 Entering rate assignment . 78
12.7.3 Reverting from rate assignment . 78
12.7.4 Reverting from quiet mode . 78
12.7.5 Retry of interrogation response . 78
12.8 Message formats . 79
12.8.1 Received messages . 79
12.8.2 Transmitted messages . 79
13 Specific tests of network layer . 79
13.1 Regional area designation by VDL message . 79
13.1.1 Method of measurement . 79
13.1.2 Required results . 80
13.2 Regional area designation by serial message or manually . 80
13.2.1 Method of measurement . 80
13.2.2 Required result . 80
13.3 Management of received regional operating settings . 80
13.3.1 Replacement or erasure of dated or remote regional operating settings . 80
13.3.2 Channel management by addressed Message 22 . 81
13.3.3 Invalid regional operating areas . 82
13.3.4 Continuation of autonomous mode reporting rate . 82
13.3.5 Other conditions . 82
Annex A (informative) Results of computer simulations and testing of CSTDMA
technology . 83
A.1 Computer simulations . 83
A.2 Carrier-sense tests . 84
A.3 Range tests . 85
A.4 Conclusion . 85
Annex B (informative) Description of the system . 86
Annex C (normative) DSC channel management . 87
C.1 DSC functionality . 87
C.2 DSC time sharing . 87
C.3 DSC functionality tests . 88
C.3.1 General . 88
C.3.2 Regional area designation . 88
C.3.3 Scheduling . 88

– 6 – IEC 62287-1:2017  IEC 2017
C.3.4 DSC flag in Message 18 . 88
C.3.5 DSC monitoring time plan . 88
C.3.6 Replacement or erasure of dated or remote regional operating settings . 89
C.3.7 Test of addressed telecommand . 89
C.3.8 Invalid regional operating areas . 90
C.4 DSC receiver tests . 90
C.4.1 General . 90
C.4.2 Maximum sensitivity. 90
C.4.3 Error behaviour at high input levels. 91
C.4.4 Co-channel rejection . 91
C.4.5 Adjacent channel selectivity . 91
C.4.6 Spurious response rejection . 92
C.4.7 Intermodulation response rejection . 92
C.4.8 Blocking or desensitisation . 93
Annex D (informative) Channel management regions . 94
Bibliography . 95

Figure 1 – OSI layer model . 22
Figure 2 – Carrier-sense timing . 27
Figure 3 – Power versus time mask . 28
Figure 4 – Transmission packet . 29
Figure 5 – Training sequence . 30
Figure 6 – Transmission timing . 32
Figure 7 – Example for CSTDMA access. 33
Figure 8 – Format for repeating four-packet cluster . 44
Figure 9 – Measurement arrangement for carrier power . 61
Figure 10 – Emission mask . 62
Figure 11 – Measurement arrangement for modulation accuracy . 63
Figure 12 – Measurement arrangement . 64
Figure 13 – Measurement arrangement with two generators . 66
Figure 14 – SINAD or PER/BER measuring equipment . 68
Figure 15 – Measurement arrangement for intermodulation . 70
Figure 16 – Configuration for carrier-sense threshold test . 75
Figure 17 – Regional area scenario . 80
Figure A.1 – Effect on Class A AIS messages of Class B messages . 83
Figure A.2 – Reception of messages by Class A AIS . 84
Figure A.3 – Reception of messages by Class B AIS . 84
Figure A.4 – Range achieved by a Class A AIS from Class B AIS . 85
Figure D.1 – Channel management regions used for test given in 13.3.1 . 94

Table 1 – Position sensor fallback conditions . 19
Table 2 – Use of accuracy (PA) flag . 20
Table 3 – Transceiver characteristics . 23
Table 4 – Transmitter parameters . 24
Table 5 – Receiver parameters . 25

Table 6 – Definition of timings for Figure 3 . 28
Table 7 – Start-buffer . 30
Table 8 – Summary of the transmission packet . 31
Table 9 – Transmission timing . 32
Table 10 – Access parameters . 33
Table 11 – Use of VDL messages by a Class B "CS" AIS . 36
Table 12 – Number of data bits for use with Message 14 . 37
Table 13 – Contents of Message 18 . 38
Table 14 – Message 24 Part A . 39
Table 15 – Message 24 Part B . 39
Table 16 – Contents of Message 23 . 40
Table 17 – Reporting interval settings for use with Message 23 . 41
Table 18 – Channel management. 42
Table 19 – Content of first two packets . 45
Table 20 – Fixed PRS data derived from ITU-T O.153. 45
Table 21 – Test summary. 48
Table 22 – Peak frequency deviation versus time. 63
Table 23 – Frequencies for inter-modulation test . 70
Table 24 – Required threshold test results . 75
Table 25 – Required carrier-sense timing results . 76
Table 26 – Required channels in use . 80
Table C.1 – DSC monitoring times . 88

– 8 – IEC 62287-1:2017  IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MARITIME NAVIGATION AND RADIOCOMMUNICATION
EQUIPMENT AND SYSTEMS – CLASS B SHIPBORNE EQUIPMENT
OF THE AUTOMATIC IDENTIFICATION SYSTEM (AIS) –

Part 1: Carrier-sense time division multiple access
(CSTDMA) 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
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
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Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
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with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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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.
International Standard IEC 62287-1 has been prepared by IEC technical
committee 80: Maritime navigation and radiocommunication equipment and systems.
This third edition cancels and replaces the second edition published in 2010 and
Amendment 1:2013. This edition constitutes a technical revision.
This edition includes the following significant technical change with respect to the previous
edition: in the synchronisation method, addition of a direct method for synchronisation from an
internal UTC source.
The text of this document is based on the following documents:
FDIS Report on voting
80/837/FDIS 80/842/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 62287 series published under the general title Maritime navigation
and radiocommunication equipment 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 document will remain unchanged until the
stability date indicated on the IEC website under "http://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.
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 62287-1:2017  IEC 2017
INTRODUCTION
The International Electrotechnical Commission (IEC) draws attention to the fact that it is
claimed that compliance with this document may involve the use of a patent concerning the
communication method and system given in 7.3.2.
IEC takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured the IEC that he/she is willing to negotiate licences
under reasonable and non-discriminatory terms and conditions with applicants throughout the
world. In this respect, the statement of the holder of this patent right is registered with IEC.
Information may be obtained from:
SRT Marine systems plc
Neil Peniket
Chief Operating Officer
SRT Marine Systems plc, Wireless House, First Avenue, Westfield Industrial Estate,
Midsomer Norton, Bath, UK. BA3 4BS
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights other than those identified above. IEC shall not be held responsible for
identifying any or all such patent rights.
ISO (www.iso.org/patents) and IEC (http://patents.iec.ch) maintain on-line data bases of
patents relevant to their standards. Users are encouraged to consult the data bases for the
most up to date information concerning patents.

MARITIME NAVIGATION AND RADIOCOMMUNICATION
EQUIPMENT AND SYSTEMS – CLASS B SHIPBORNE EQUIPMENT
OF THE AUTOMATIC IDENTIFICATION SYSTEM (AIS) –

Part 1: Carrier-sense time division multiple access
(CSTDMA) techniques
1 Scope
This part of IEC 62287 specifies the minimum operational and performance requirements,
methods of testing and required test results for Class B shipborne automatic identification
system (AIS) equipment using carrier-sense time division multiple access (CSTDMA)
techniques. This document takes into account other associated IEC International Standards
and existing national standards, as applicable.
It is applicable for AIS equipment used on craft that are not covered by the mandatory
carriage requirement of AIS under SOLAS Chapter V.
An AIS station intended to operate in receive-only mode is not considered a Class B
shipborne mobile AIS station.
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 61162-1, Maritime navigation and radiocommunication equipment and systems – Digital
interfaces – Part 1: Single talker and multiple listeners
IEC 61993-2, Maritime navigation and radiocommunication 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
IEC 62320-1, Maritime navigation and radiocommunication equipment and systems –
Automatic identification systems (AIS) – Part 1: AIS Base Stations – Minimum operational and
performance requirements, methods of testing and required test results
ITU-R Recommendation M.493, Digital selective-calling system for use in the maritime mobile
service
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

– 12 – IEC 62287-1:2017  IEC 2017
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
ITU, Radio Regulations:2012 (available at http://www.itu.int/publ/R-REG-RR/en)
3 Terms, definitions and abbreviated terms
3.1 Term
...

IEC 62287-1 ®
Edition 3.0 2017-04
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Maritime navigation and radiocommunication equipment and systems – Class B
shipborne equipment of the automatic identification system (AIS) –
Part 1: Carrier-sense time division multiple access (CSTDMA) techniques

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and

CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
IEC 62287-1 ®
Edition 3.0 2017-04
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Maritime navigation and radiocommunication equipment and systems – Class B

shipborne equipment of the automatic identification system (AIS) –

Part 1: Carrier-sense time division multiple access (CSTDMA) techniques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 47.020.70 ISBN 978-2-8322-4217-9

– 2 – IEC 62287-1:2017 RLV  IEC 2017
CONTENTS
FOREWORD . 8
INTRODUCTION . 10
1 Scope . 11
2 Normative references . 11
3 Terms, definitions and abbreviated terms . 12
3.1 Terms and definitions . 12
3.2 Abbreviated terms . 12
4 General requirements . 14
4.1 General . 14
4.1.1 Capabilities of the Class B "CS" AIS . 14
4.1.2 Quality assurance . 14
4.1.3 Safety of operation . 14
4.1.4 Additional features . 14
4.1.5 Modes of operation . 15
4.2 Manuals . 15
4.3 Marking and identification . 15
5 Environmental, power supply, interference and safety requirements . 16
6 Performance requirements. 16
6.1 Composition . 16
6.2 Operating frequency channels . 17
6.3 GNSS receiver for position reporting . 17
6.4 Identification . 17
6.5 AIS information . 18
6.5.1 Information content . 18
6.5.2 Information reporting intervals . 19
6.5.3 Permissible initialisation period . 19
6.6 Alarms and indications, fall-back arrangements . 19
6.6.1 Integrity and protection . 19
6.6.2 Transmitter shutdown procedure . 19
6.6.3 Position sensor fallback conditions . 20
6.6.4 SOG/COG sensor fallback conditions . 21
6.7 User interface . 21
6.7.1 Indicators and display . 21
6.7.2 Static data input . 21
6.7.3 External interfaces . 21
6.8 Protection from invalid control commands . 21
7 Technical requirements . 22
7.1 General . 22
7.2 Physical layer . 22
7.2.1 General . 22
7.2.2 Transceiver characteristics . 22
7.2.3 Transmitter requirements . 24
7.2.4 Receiver requirements . 24
7.3 Link layer . 25
7.3.1 General . 25

7.3.2 Link sublayer 1: Medium access control (MAC) . 25
7.3.3 Link sublayer 2: Data Link Service (DLS) . 28
7.3.4 Link sublayer 3: Link management entity (LME) . 33
7.4 Network layer . 41
7.4.1 General . 41
7.4.2 Dual channel operation . 41
7.4.3 Channel management . 42
7.4.4 Distribution of transmission packets . 42
7.4.5 Data link congestion resolution . 42
7.5 Transport layer . 42
7.5.1 General . 42
7.5.2 Transmission packets . 43
7.5.3 Sequencing of data packets . 43
7.6 Digital selective calling (DSC) . 43
8 Test conditions . 43
8.1 General . 43
8.2 Normal and extreme test conditions . 43
8.2.1 Normal test conditions . 43
8.2.2 Extreme test conditions . 43
8.3 Test signals . 44
8.3.1 Standard test signal number 1 . 44
8.3.2 Standard test signal number 2 . 44
8.3.3 Standard test signal number 3 . 44
8.3.4 Standard test signal number 4 . 44
8.3.5 Standard test signal number 5 . 44
8.4 Test arrangements . 45
8.4.1 Standard test environment . 45
8.4.2 Modes of operation of the transmitter. 46
8.4.3 Common test conditions for protection from invalid controls . 46
8.4.4 Measurement uncertainties . 46
9 Power supply, environmental and EMC tests . 47
9.1 Test summary . 47
9.2 Vibration/shock . 49
9.2.1 Vibration . 49
9.2.2 Shock . 49
9.3 Performance tests/checks . 49
9.4 Undervoltage test (brown out) . 50
9.4.1 Purpose . 50
9.4.2 Method of test. 50
9.4.3 Required result . 50
10 Operational tests . 50
10.1 General . 50
10.1.1 Quality assurance . 50
10.1.2 Safety of operation . 50
10.1.3 Additional features . 50
10.2 Modes of operation . 51
10.2.1 Autonomous mode . 51
10.2.2 Assigned mode . 52
10.2.3 Polled mode/interrogation response . 53

– 4 – IEC 62287-1:2017 RLV  IEC 2017
10.3 Messages extending one time period . 54
10.3.1 Method of measurement . 54
10.3.2 Required results . 54
10.4 Channel selection . 54
10.4.1 Valid channels . 54
10.4.2 Invalid channels . 54
10.5 Internal GNSS receiver . 54
10.6 AIS information . 55
10.6.1 Information content . 55
10.6.2 Information update rates . 56
10.7 Initialisation period . 57
10.7.1 Method of measurement . 57
10.7.2 Required results . 57
10.8 Alarms and indications, fall-back arrangements . 57
10.8.1 Built-in integrity test . 58
10.8.2 Transceiver protection . 58
10.8.3 Transmitter shutdown procedure . 58
10.8.4 Position sensor fallback conditions . 58
10.8.5 Speed sensors . 59
10.9 User interface . 59
10.9.1 Display . 59
10.9.2 Message display . 59
10.9.3 Static data input . 60
10.9.4 External interfaces . 60
11 Physical tests . 60
11.1 TDMA transmitter . 60
11.1.1 Frequency error . 60
11.1.2 Carrier power . 61
11.1.3 Transmission spectrum . 61
11.1.4 Modulation accuracy . 62
11.1.5 Transmitter output power versus time function . 64
11.2 TDMA receivers . 64
11.2.1 Sensitivity . 64
11.2.2 Error behaviour at high input levels. 65
11.2.3 Co-channel rejection . 66
11.2.4 Adjacent channel selectivity . 67
11.2.5 Spurious response rejection . 67
11.2.6 Intermodulation response rejection . 70
11.2.7 Blocking or desensitisation . 71
11.3 Conducted spurious emissions . 72
11.3.1 Spurious emissions from the receiver . 72
11.3.2 Spurious emissions from the transmitter . 72
12 Specific tests of link layer . 73
12.1 TDMA synchronisation . 73
12.1.1 Synchronisation test sync mode 1 . 73
12.1.2 Synchronisation test sync mode 2 . 74
12.1.3 Synchronisation test with UTC . 74
12.2 Carrier-sense tests . 74
12.2.1 Threshold level . 74

12.2.2 Carrier-sense timing . 76
12.3 VDL state/reservations . 76
12.3.1 Method of measurement . 76
12.3.2 Required results . 77
12.4 Data encoding (bit stuffing) . 77
12.4.1 Method of measurement . 77
12.4.2 Required results . 77
12.5 Frame check sequence . 77
12.5.1 Method of measurement . 77
12.5.2 Required results . 77
12.6 Slot allocation (channel access protocol) . 77
12.6.1 Autonomous mode allocation . 77
12.6.2 DSC listening periods . 78
12.7 Assigned operation . 78
12.7.1 Assignment priority . 78
12.7.2 Entering rate assignment . 78
12.7.3 Reverting from rate assignment . 79
12.7.4 Reverting from quiet mode . 79
12.7.5 Retry of interrogation response . 79
12.8 Message formats . 79
12.8.1 Received messages . 79
12.8.2 Transmitted messages . 80
13 Specific tests of network layer . 80
13.1 Regional area designation by VDL message . 80
13.1.1 Method of measurement . 80
13.1.2 Required results . 80
13.2 Regional area designation by serial message or manually . 81
13.2.1 Method of measurement . 81
13.2.2 Required result . 81
13.3 Management of received regional operating settings . 81
13.3.1 Replacement or erasure of dated or remote regional operating settings . 81
13.3.2 Channel management by addressed Message 22 . 82
13.3.3 Invalid regional operating areas . 82
13.3.4 Continuation of autonomous mode reporting rate . 83
13.3.5 Other conditions . 83
Annex A (informative) Results of computer simulations and testing of CSTDMA
technology . 84
A.1 Computer simulations . 84
A.2 Carrier-sense tests . 85
A.3 Range tests . 86
A.4 Conclusion . 86
Annex B (informative) Description of the system . 87
Annex C (normative) DSC channel management . 88
C.1 DSC functionality . 88
C.2 DSC time sharing . 88
C.3 DSC functionality tests . 89
C.3.1 General . 89
C.3.2 Regional area designation . 89
C.3.3 Scheduling . 89

– 6 – IEC 62287-1:2017 RLV  IEC 2017
C.3.4 DSC flag in Message 18 . 89
C.3.5 DSC monitoring time plan . 89
C.3.6 Replacement or erasure of dated or remote regional operating settings . 90
C.3.7 Test of addressed telecommand . 90
C.3.8 Invalid regional operating areas . 91
C.4 DSC receiver tests . 91
C.4.1 General . 91
C.4.2 Maximum sensitivity. 91
C.4.3 Error behaviour at high input levels. 92
C.4.4 Co-channel rejection . 92
C.4.5 Adjacent channel selectivity . 92
C.4.6 Spurious response rejection . 93
C.4.7 Intermodulation response rejection . 93
C.4.8 Blocking or desensitisation . 94
Annex D (informative) Channel management regions . 95
Bibliography . 96

Figure 1 – OSI layer model . 22
Figure 2 – Carrier-sense timing . 27
Figure 3 – Power versus time mask . 28
Figure 4 – Transmission packet . 29
Figure 5 – Training sequence . 30
Figure 6 – Transmission timing . 32
Figure 7 – Example for CSTDMA access. 33
Figure 8 – Format for repeating four-packet cluster . 44
Figure 9 – Measurement arrangement for carrier power . 61
Figure 10 – Emission mask . 62
Figure 11 – Measurement arrangement for modulation accuracy . 63
Figure 12 – Measurement arrangement . 65
Figure 13 – Measurement arrangement with two generators . 66
Figure 14 – SINAD or PER/BER measuring equipment . 68
Figure 15 – Measurement arrangement for intermodulation . 70
Figure 16 – Configuration for carrier-sense threshold test . 75
Figure 17 – Regional area scenario . 80
Figure A.1 – Effect on Class A AIS messages of Class B messages . 84
Figure A.2 – Reception of messages by Class A AIS . 85
Figure A.3 – Reception of messages by Class B AIS . 85
Figure A.4 – Range achieved by a Class A AIS from Class B AIS . 86
Figure D.1 – Channel management regions used for test given in 13.3.1 . 95

Table 1 – Position sensor fallback conditions . 20
Table 2 – Use of accuracy (PA) flag . 20
Table 3 – Transceiver characteristics . 23
Table 4 – Transmitter parameters . 24
Table 5 – Receiver parameters . 25

Table 6 – Definition of timings for Figure 3 . 28
Table 7 – Start-buffer . 30
Table 8 – Summary of the transmission packet . 31
Table 9 – Transmission timing . 32
Table 10 – Access parameters . 33
Table 11 – Use of VDL messages by a Class B "CS" AIS . 36
Table 12 – Number of data bits for use with Message 14 . 37
Table 13 – Contents of Message 18 . 38
Table 14 – Message 24 Part A . 39
Table 15 – Message 24 Part B . 39
Table 16 – Contents of Message 23 . 40
Table 17 – Reporting interval settings for use with Message 23 . 41
Table 18 – Channel management. 42
Table 19 – Content of first two packets . 45
Table 20 – Fixed PRS data derived from ITU-T O.153. 45
Table 21 – Test summary. 48
Table 22 – Peak frequency deviation versus time. 63
Table 23 – Frequencies for inter-modulation test . 71
Table 24 – Required threshold test results . 76
Table 25 – Required carrier-sense timing results . 76
Table 26 – Required channels in use . 81
Table C.1 – DSC monitoring times . 89

– 8 – IEC 62287-1:2017 RLV  IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MARITIME NAVIGATION AND RADIOCOMMUNICATION
EQUIPMENT AND SYSTEMS – CLASS B SHIPBORNE EQUIPMENT
OF THE AUTOMATIC IDENTIFICATION SYSTEM (AIS) –

Part 1: Carrier-sense time division multiple access
(CSTDMA) techniques
FOREWORD
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This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.

International Standard IEC 62287-1 has been prepared by IEC technical
committee 80: Maritime navigation and radiocommunication equipment and systems.
This third edition cancels and replaces the second edition published in 2010 and
Amendment 1:2013. This edition constitutes a technical revision.
This edition includes the following significant technical change with respect to the previous
edition: in the synchronisation method, addition of a direct method for synchronisation from an
internal UTC source.
The text of this document is based on the following documents:
FDIS Report on voting
80/837/FDIS 80/842/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 62287 series published under the general title Maritime navigation
and radiocommunication equipment 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 document will remain unchanged until the
stability date indicated on the IEC website under "http://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.
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 62287-1:2017 RLV  IEC 2017
INTRODUCTION
The International Electrotechnical Commission (IEC) draws attention to the fact that it is
claimed that compliance with this document may involve the use of a patent concerning the
communication method and system given in 7.3.2.
IEC takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured the IEC that he/she is willing to negotiate licences
under reasonable and non-discriminatory terms and conditions with applicants throughout the
world. In this respect, the statement of the holder of this patent right is registered with IEC.
Information may be obtained from:
SRT Marine systems plc
Neil Peniket
Chief Operating Officer
SRT Marine Systems plc, Wireless House, First Avenue, Westfield Industrial Estate,
Midsomer Norton, Bath, UK. BA3 4BS
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights other than those identified above. IEC shall not be held responsible for
identifying any or all such patent rights.
ISO (www.iso.org/patents) and IEC (http://patents.iec.ch) maintain on-line data bases of
patents relevant to their standards. Users are encouraged to consult the data bases for the
most up to date information concerning patents.

MARITIME NAVIGATION AND RADIOCOMMUNICATION
EQUIPMENT AND SYSTEMS – CLASS B SHIPBORNE EQUIPMENT
OF THE AUTOMATIC IDENTIFICATION SYSTEM (AIS) –

Part 1: Carrier-sense time division multiple access
(CSTDMA) techniques
1 Scope
This part of IEC 62287 specifies the minimum operational and performance requirements,
methods of testing and required test results for Class B shipborne automatic identification
system (AIS) equipment using carrier-sense time division multiple access (CSTDMA)
techniques. This document takes into account other associated IEC International Standards
and existing national standards, as applicable.
It is applicable for AIS equipment used on craft that are not covered by the mandatory
carriage requirement of AIS under SOLAS Chapter V.
An AIS station intended to operate in receive-only mode is not considered a Class B
shipborne mobile AIS station.
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 61162 (all parts), Maritime navigation and radiocommunication equipment and systems –
Digital interfaces
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 radiocommunication equipment and systems –
Automatic identification systems (AIS) – Part 2: Class A shipborne equipment of the universal
automatic identification system (AIS) – Operational and performance requirements, methods
of test and required test results
IEC 62320-1, Maritime navigation and radiocommunication equipment and systems –
Automatic identification systems (AIS) – Part 1: AIS Base Stations – Minimum operational and
performance requirements, methods of testing and required test results
IMO MSC.140(76), Recommendation for the protection of the AIS VHF data link

– 12 – IEC 62287-1:2017 RLV  IEC 2017
ITU-R Recommendation M.493-13, Digital selective-calling system for use in the maritime
mobile service
ITU-R Recommendation M.825-3:1998, Characteristics of a transponder system using digital
selective cal
...

IEC 62287-1 ®
Edition 3.0 2017-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Maritime navigation and radiocommunication equipment and systems – Class B
shipborne equipment of the automatic identification system (AIS) –
Part 1: Carrier-sense time division multiple access (CSTDMA) techniques

Matériels et systèmes de navigation et de radiocommunication maritimes –
Transpondeur embarqué du système d’identification automatique (AIS) de
classe B –
Partie 1: Techniques d’accès multiple par répartition dans le temps avec écoute
de porteuse (CSTDMA)
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IEC 62287-1 ®
Edition 3.0 2017-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Maritime navigation and radiocommunication equipment and systems – Class B

shipborne equipment of the automatic identification system (AIS) –

Part 1: Carrier-sense time division multiple access (CSTDMA) techniques

Matériels et systèmes de navigation et de radiocommunication maritimes –

Transpondeur embarqué du système d’identification automatique (AIS) de

classe B –
Partie 1: Techniques d’accès multiple par répartition dans le temps avec écoute

de porteuse (CSTDMA)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 47.020.70 ISBN 978-2-8322-1039-9

– 2 – IEC 62287-1:2017  IEC 2017
CONTENTS
FOREWORD . 8
INTRODUCTION . 10
1 Scope . 11
2 Normative references . 11
3 Terms, definitions and abbreviated terms . 12
3.1 Terms and definitions . 12
3.2 Abbreviated terms . 12
4 General requirements . 13
4.1 General . 13
4.1.1 Capabilities of the Class B "CS" AIS . 13
4.1.2 Quality assurance . 13
4.1.3 Safety of operation . 14
4.1.4 Additional features . 14
4.1.5 Modes of operation . 14
4.2 Manuals . 15
4.3 Marking and identification . 15
5 Environmental, power supply, interference and safety requirements . 15
6 Performance requirements. 16
6.1 Composition . 16
6.2 Operating frequency channels . 16
6.3 GNSS receiver for position reporting . 16
6.4 Identification . 17
6.5 AIS information . 17
6.5.1 Information content . 17
6.5.2 Information reporting intervals . 18
6.5.3 Permissible initialisation period . 18
6.6 Alarms and indications, fall-back arrangements . 18
6.6.1 Integrity and protection . 18
6.6.2 Transmitter shutdown procedure . 19
6.6.3 Position sensor fallback conditions . 19
6.6.4 SOG/COG sensor fallback conditions . 20
6.7 User interface . 20
6.7.1 Indicators and display . 20
6.7.2 Static data input . 20
6.7.3 External interfaces . 20
6.8 Protection from invalid control commands . 21
7 Technical requirements . 21
7.1 General . 21
7.2 Physical layer . 22
7.2.1 General . 22
7.2.2 Transceiver characteristics . 22
7.2.3 Transmitter requirements . 24
7.2.4 Receiver requirements . 24
7.3 Link layer . 25
7.3.1 General . 25
7.3.2 Link sublayer 1: Medium access control (MAC) . 25

7.3.3 Link sublayer 2: Data Link Service (DLS) . 28
7.3.4 Link sublayer 3: Link management entity (LME) . 33
7.4 Network layer . 41
7.4.1 General . 41
7.4.2 Dual channel operation . 41
7.4.3 Channel management . 42
7.4.4 Distribution of transmission packets . 42
7.4.5 Data link congestion resolution . 42
7.5 Transport layer . 42
7.5.1 General . 42
7.5.2 Transmission packets . 43
7.5.3 Sequencing of data packets . 43
7.6 Digital selective calling (DSC) . 43
8 Test conditions . 43
8.1 General . 43
8.2 Normal and extreme test conditions . 43
8.2.1 Normal test conditions . 43
8.2.2 Extreme test conditions . 43
8.3 Test signals . 43
8.3.1 Standard test signal number 1 . 44
8.3.2 Standard test signal number 2 . 44
8.3.3 Standard test signal number 3 . 44
8.3.4 Standard test signal number 4 . 44
8.3.5 Standard test signal number 5 . 44
8.4 Test arrangements . 45
8.4.1 Standard test environment . 45
8.4.2 Modes of operation of the transmitter. 46
8.4.3 Common test conditions for protection from invalid controls . 46
8.4.4 Measurement uncertainties . 46
9 Power supply, environmental and EMC tests . 47
9.1 Test summary . 47
9.2 Vibration/shock . 49
9.2.1 Vibration . 49
9.2.2 Shock . 49
9.3 Performance tests/checks . 49
9.4 Undervoltage test (brown out) . 50
9.4.1 Purpose . 50
9.4.2 Method of test. 50
9.4.3 Required result . 50
10 Operational tests . 50
10.1 General . 50
10.1.1 Quality assurance . 50
10.1.2 Safety of operation . 50
10.1.3 Additional features . 50
10.2 Modes of operation . 51
10.2.1 Autonomous mode . 51
10.2.2 Assigned mode . 52
10.2.3 Polled mode/interrogation response . 53
10.3 Messages extending one time period . 54

– 4 – IEC 62287-1:2017  IEC 2017
10.3.1 Method of measurement . 54
10.3.2 Required results . 54
10.4 Channel selection . 54
10.4.1 Valid channels . 54
10.4.2 Invalid channels . 54
10.5 Internal GNSS receiver . 54
10.6 AIS information . 55
10.6.1 Information content . 55
10.6.2 Information update rates . 56
10.7 Initialisation period . 57
10.7.1 Method of measurement . 57
10.7.2 Required results . 57
10.8 Alarms and indications, fall-back arrangements . 57
10.8.1 Built-in integrity test . 57
10.8.2 Transceiver protection . 58
10.8.3 Transmitter shutdown procedure . 58
10.8.4 Position sensor fallback conditions . 58
10.8.5 Speed sensors . 59
10.9 User interface . 59
10.9.1 Display . 59
10.9.2 Message display . 59
10.9.3 Static data input . 60
10.9.4 External interfaces . 60
11 Physical tests . 60
11.1 TDMA transmitter . 60
11.1.1 Frequency error . 60
11.1.2 Carrier power . 61
11.1.3 Transmission spectrum . 61
11.1.4 Modulation accuracy . 62
11.1.5 Transmitter output power versus time function . 63
11.2 TDMA receivers . 64
11.2.1 Sensitivity . 64
11.2.2 Error behaviour at high input levels. 65
11.2.3 Co-channel rejection . 65
11.2.4 Adjacent channel selectivity . 66
11.2.5 Spurious response rejection . 67
11.2.6 Intermodulation response rejection . 69
11.2.7 Blocking or desensitisation . 70
11.3 Conducted spurious emissions . 71
11.3.1 Spurious emissions from the receiver . 71
11.3.2 Spurious emissions from the transmitter . 72
12 Specific tests of link layer . 72
12.1 TDMA synchronisation . 72
12.1.1 Synchronisation test sync mode 1 . 72
12.1.2 Synchronisation test sync mode 2 . 73
12.1.3 Synchronisation test with UTC . 74
12.2 Carrier-sense tests . 74
12.2.1 Threshold level . 74
12.2.2 Carrier-sense timing . 75

12.3 VDL state/reservations . 76
12.3.1 Method of measurement . 76
12.3.2 Required results . 76
12.4 Data encoding (bit stuffing) . 76
12.4.1 Method of measurement . 76
12.4.2 Required results . 76
12.5 Frame check sequence . 76
12.5.1 Method of measurement . 76
12.5.2 Required results . 76
12.6 Slot allocation (channel access protocol) . 77
12.6.1 Autonomous mode allocation . 77
12.6.2 DSC listening periods . 77
12.7 Assigned operation . 77
12.7.1 Assignment priority . 77
12.7.2 Entering rate assignment . 78
12.7.3 Reverting from rate assignment . 78
12.7.4 Reverting from quiet mode . 78
12.7.5 Retry of interrogation response . 78
12.8 Message formats . 79
12.8.1 Received messages . 79
12.8.2 Transmitted messages . 79
13 Specific tests of network layer . 79
13.1 Regional area designation by VDL message . 79
13.1.1 Method of measurement . 79
13.1.2 Required results . 80
13.2 Regional area designation by serial message or manually . 80
13.2.1 Method of measurement . 80
13.2.2 Required result . 80
13.3 Management of received regional operating settings . 80
13.3.1 Replacement or erasure of dated or remote regional operating settings . 80
13.3.2 Channel management by addressed Message 22 . 81
13.3.3 Invalid regional operating areas . 82
13.3.4 Continuation of autonomous mode reporting rate . 82
13.3.5 Other conditions . 82
Annex A (informative) Results of computer simulations and testing of CSTDMA
technology . 83
A.1 Computer simulations . 83
A.2 Carrier-sense tests . 84
A.3 Range tests . 85
A.4 Conclusion . 85
Annex B (informative) Description of the system . 86
Annex C (normative) DSC channel management . 87
C.1 DSC functionality . 87
C.2 DSC time sharing . 87
C.3 DSC functionality tests . 88
C.3.1 General . 88
C.3.2 Regional area designation . 88
C.3.3 Scheduling . 88
C.3.4 DSC flag in Message 18 . 88

– 6 – IEC 62287-1:2017  IEC 2017
C.3.5 DSC monitoring time plan . 88
C.3.6 Replacement or erasure of dated or remote regional operating settings . 89
C.3.7 Test of addressed telecommand . 89
C.3.8 Invalid regional operating areas . 90
C.4 DSC receiver tests . 90
C.4.1 General . 90
C.4.2 Maximum sensitivity. 90
C.4.3 Error behaviour at high input levels. 91
C.4.4 Co-channel rejection . 91
C.4.5 Adjacent channel selectivity . 91
C.4.6 Spurious response rejection . 92
C.4.7 Intermodulation response rejection . 92
C.4.8 Blocking or desensitisation . 93
Annex D (informative) Channel management regions . 94
Bibliography . 95

Figure 1 – OSI layer model . 22
Figure 2 – Carrier-sense timing . 27
Figure 3 – Power versus time mask . 28
Figure 4 – Transmission packet . 29
Figure 5 – Training sequence . 30
Figure 6 – Transmission timing . 32
Figure 7 – Example for CSTDMA access. 33
Figure 8 – Format for repeating four-packet cluster . 44
Figure 9 – Measurement arrangement for carrier power . 61
Figure 10 – Emission mask . 62
Figure 11 – Measurement arrangement for modulation accuracy . 63
Figure 12 – Measurement arrangement . 64
Figure 13 – Measurement arrangement with two generators . 66
Figure 14 – SINAD or PER/BER measuring equipment . 68
Figure 15 – Measurement arrangement for intermodulation . 70
Figure 16 – Configuration for carrier-sense threshold test . 75
Figure 17 – Regional area scenario . 80
Figure A.1 – Effect on Class A AIS messages of Class B messages . 83
Figure A.2 – Reception of messages by Class A AIS . 84
Figure A.3 – Reception of messages by Class B AIS . 84
Figure A.4 – Range achieved by a Class A AIS from Class B AIS . 85
Figure D.1 – Channel management regions used for test given in 13.3.1 . 94

Table 1 – Position sensor fallback conditions . 19
Table 2 – Use of accuracy (PA) flag . 20
Table 3 – Transceiver characteristics . 23
Table 4 – Transmitter parameters . 24
Table 5 – Receiver parameters . 25
Table 6 – Definition of timings for Figure 3 . 28

Table 7 – Start-buffer . 30
Table 8 – Summary of the transmission packet . 31
Table 9 – Transmission timing . 32
Table 10 – Access parameters . 33
Table 11 – Use of VDL messages by a Class B "CS" AIS . 36
Table 12 – Number of data bits for use with Message 14 . 37
Table 13 – Contents of Message 18 . 38
Table 14 – Message 24 Part A . 39
Table 15 – Message 24 Part B . 39
Table 16 – Contents of Message 23 . 40
Table 17 – Reporting interval settings for use with Message 23 . 41
Table 18 – Channel management. 42
Table 19 – Content of first two packets . 45
Table 20 – Fixed PRS data derived from ITU-T O.153. 45
Table 21 – Test summary. 48
Table 22 – Peak frequency deviation versus time. 63
Table 23 – Frequencies for inter-modulation test . 70
Table 24 – Required threshold test results . 75
Table 25 – Required carrier-sense timing results . 76
Table 26 – Required channels in use . 80
Table C.1 – DSC monitoring times . 88

– 8 – IEC 62287-1:2017  IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MARITIME NAVIGATION AND RADIOCOMMUNICATION
EQUIPMENT AND SYSTEMS – CLASS B SHIPBORNE EQUIPMENT
OF THE AUTOMATIC IDENTIFICATION SYSTEM (AIS) –

Part 1: Carrier-sense time division multiple access
(CSTDMA) techniques
FOREWORD
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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 62287-1 has been prepared by IEC technical
committee 80: Maritime navigation and radiocommunication equipment and systems.
This third edition cancels and replaces the second edition published in 2010 and
Amendment 1:2013. This edition constitutes a technical revision.
This edition includes the following significant technical change with respect to the previous
edition: in the synchronisation method, addition of a direct method for synchronisation from an
internal UTC source.
The text of this document is based on the following documents:
FDIS Report on voting
80/837/FDIS 80/842/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 62287 series published under the general title Maritime navigation
and radiocommunication equipment 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 document will remain unchanged until the
stability date indicated on the IEC website under "http://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.
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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 62287-1:2017  IEC 2017
INTRODUCTION
The International Electrotechnical Commission (IEC) draws attention to the fact that it is
claimed that compliance with this document may involve the use of a patent concerning the
communication method and system given in 7.3.2.
IEC takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured the IEC that he/she is willing to negotiate licences
under reasonable and non-discriminatory terms and conditions with applicants throughout the
world. In this respect, the statement of the holder of this patent right is registered with IEC.
Information may be obtained from:
SRT Marine systems plc
Neil Peniket
Chief Operating Officer
SRT Marine Systems plc, Wireless House, First Avenue, Westfield Industrial Estate,
Midsomer Norton, Bath, UK. BA3 4BS
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights other than those identified above. IEC shall not be held responsible for
identifying any or all such patent rights.
ISO (www.iso.org/patents) and IEC (http://patents.iec.ch) maintain on-line data bases of
patents relevant to their standards. Users are encouraged to consult the data bases for the
most up to date information concerning patents.

MARITIME NAVIGATION AND RADIOCOMMUNICATION
EQUIPMENT AND SYSTEMS – CLASS B SHIPBORNE EQUIPMENT
OF THE AUTOMATIC IDENTIFICATION SYSTEM (AIS) –

Part 1: Carrier-sense time division multiple access
(CSTDMA) techniques
1 Scope
This part of IEC 62287 specifies the minimum operational and performance requirements,
methods of testing and required test results for Class B shipborne automatic
...