IEC 61162-450:2024

IEC 61162-450 ®
Edition 3.0 2024-04
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Maritime navigation and radiocommunication equipment and systems –
Digital interfaces –
Part 450: Multiple talkers and multiple listeners – Ethernet interconnection
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IEC 61162-450 ®
Edition 3.0 2024-04
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Maritime navigation and radiocommunication equipment and systems –
Digital interfaces –
Part 450: Multiple talkers and multiple listeners – Ethernet interconnection
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 47.020.70 ISBN 978-2-8322-8714-9
– 2 – IEC 61162-450:2024 CMV © IEC 2024
CONTENTS
FOREWORD .7
1 Scope .9
2 Normative references .9
3 Terms and definitions . 10
4 General network and equipment requirements . 14
4.1 Network topology example . 14
4.2 Basic requirements . 15
4.2.1 Requirements for equipment to be connected to the network . 15
4.2.2 Additional requirements for network infrastructure equipment. 16
4.3 Network function (NF) requirements . 16
4.3.1 General requirements . 16
4.3.2 Maximum data rate requirements . 16
4.3.3 Error logging function . 17
4.3.4 Provisions for network traffic filtering – IGMP . 19
4.4 System function block (SF) requirements . 19
4.4.1 General requirements . 19
4.4.2 Implementing configurable transmission groups . 19
4.4.3 Assignment of unique system function ID (SFI) . 20
4.5 Serial to network gateway function (SNGF) requirements . 20
4.5.1 General requirements . 20
4.5.2 Serial line output buffer management . 22
4.5.3 Datagram output requirements . 23
4.5.4 Multi SF serial port . 23
4.5.5 Handling malformed data received on serial line . 24
4.6 PGN to network gateway function (PNGF) requirements . 24
4.6.1 General requirements . 24
4.6.2 Output buffer management from IEC 61162-450 network to IEC 61162-3
network . 24
4.6.3 Datagram output requirements . 25
4.6.4 PGN group number . 25
4.7 Other network function (ONF) requirements . 25
5 Low level network requirements . 25
5.1 Electrical and mechanical requirements . 25
5.2 Network protocol requirements . 26
5.3 IP address assignment for equipment . 27
5.4 Multicast address range . 27
5.5 Device address for instrument networks . 28
6 Transport layer specification . 28
6.1 General . 28
6.2 UDP messages . 29
6.2.1 UDP multicast protocol . 29
6.2.2 Use of multicast addresses and port numbers. 29
6.2.3 UDP checksum . 31
6.2.4 Datagram size . 32
7 Application layer specification . 32
7.1 Datagram header . 32

7.1.1 Valid header . 32
7.1.2 Error logging . 32
7.2 General IEC 61162-1 sentence transmissions . 32
7.2.1 Application of this protocol . 32
7.2.2 Types of messages for which this protocol can be used . 32
7.2.3 TAG block parameters for sentences transmitted in the datagram . 33
7.2.4 Requirements for processing incoming datagrams . 39
7.2.5 Error logging for processing incoming datagrams. 39
7.3 Binary file transfer using UDP multicast – Single transmitter, multiple
receivers . 40
7.3.1 Application of this protocol . 40
7.3.2 Binary file structure . 40
7.3.3 61162-450 header . 41
7.3.4 Binary file descriptor structure . 43
7.3.5 Binary file data fragment . 43
7.3.6 Sender process for binary file transfer . 44
7.3.7 Receiver process for binary file transfer . 47
7.3.8 Other requirements . 49
7.3.9 Error logging . 51
7.4 General IEC 61162-3 PGN message transmissions . 51
7.4.1 Message structure . 51
7.4.2 Message format . 52
7.4.3 Address translation requirements . 52
7.4.4 Message processing . 53
7.4.5 Additional management requirements . 53
7.5 System function ID resolution . 53
7.5.1 General . 54
7.5.2 Transmitter functions . 54
7.6 Binary file transfer using TCP point-to-point. 54
7.6.1 Definition. 54
7.6.2 Data field structure for transfer of files . 55
7.6.3 Structure of the transfer stream. 57
7.6.4 TCP port and IP addresses . 58
7.6.5 Implementation guidance . 58
8 Methods of test and required results . 59
8.1 Test set-up and equipment . 59
8.2 Basic requirements . 60
8.2.1 Equipment to be connected to the network . 60
8.2.2 Network infrastructure equipment . 60
8.2.3 Documentation . 60
8.3 Network function (NF) . 60
8.3.1 Maximum data rate . 60
8.3.2 Error logging function . 60
8.4 System function block (SF) . 61
8.4.1 General . 61
8.4.2 Assignment of unique system function ID (SFI) . 61
8.4.3 Implementing configurable transmission groups . 61
8.5 Serial to network gateway function (SNGF). 61
8.5.1 General . 61

– 4 – IEC 61162-450:2024 CMV © IEC 2024
8.5.2 Serial line output buffer management . 62
8.5.3 Datagram output . 62
8.5.4 Datagram output Multi SF serial port . 62
8.5.5 Handling malformed data received on serial line . 63
8.6 Other network function (ONF) . 66
8.7 Low level network . 66
8.7.1 Electrical and mechanical requirements . 66
8.7.2 Network protocol . 66
8.7.3 IP address assignment for equipment . 66
8.7.4 Multicast address range . 67
8.8 Transport layer . 67
8.9 Application layer . 67
8.9.1 Application . 67
8.9.2 Datagram header . 67
8.9.3 Types of messages. 68
8.9.4 TAG block parameters . 68
8.9.5 General authentication . 69
8.10 Error logging . 69
8.11 Binary file transfer using UDP multicast – Single transmitter, multiple
receiver . 70
8.11.1 Sender process test . 70
8.11.2 Receiver process test . 71
8.11.3 Binary file descriptor test . 72
8.11.4 Binary file transfer error logging . 72
8.11.5 Maximum outgoing rate. 72
8.12 PGN to network gateway function (PNGF) . 72
8.12.1 General . 72
8.12.2 Output buffer management . 72
8.12.3 Datagram output . 73
8.12.4 PGN group . 73
8.12.5 Address conflicts . 73
8.13 System function ID resolution . 73
8.14 Binary file transfer using TCP point-to-point. 73
8.14.1 Test of transmit client . 73
8.14.2 Test of receiver server . 74
8.14.3 Maximum outgoing rate. 75
8.14.4 TCP port and IP addresses . 75
Annex A (normative) Classification of IEC 61162-1 talker identifier mnemonics and
sentences . 76
A.1 General . 76
A.2 Talker identifier mnemonic to transmission group mapping . 76
A.3 List of all sentence formatters and the sentence type . 78
Annex B (normative) TAG block definitions . 83
B.1 Validity . 83
B.2 Valid TAG block characters . 83
B.3 TAG block format . 83
B.4 TAG block "hexadecimal checksum" (*hh) . 84
B.5 TAG block "line" . 84
B.6 TAG block parameter-code dictionary . 85

Annex C (normative) Reliable transmission of command-response pair messages . 86
C.1 Purpose . 86
C.2 Information exchange examples . 86
C.3 Characteristics . 86
C.4 Requirements . 86
C.5 Data flow description . 87
C.5.1 Heartbeat message . 87
C.5.2 Command response pair . 87
Annex D (informative) Compatibility between IEC 61162-450 nodes based on
IEC 61162-450:2011 connected to a network which uses methods based on later
editions of IEC 61162-450:2018 . 88
D.1 General . 88
D.2 Alternative methods for compatibility . 88
D.2.1 Use of IGMP proxy node . 88
D.2.2 Use of virtual LAN (VLAN) . 88
D.2.3 Use of static multicast switch configuration . 89
Annex E (informative) Use of switch setup configuration to filter network traffic . 90
Annex F (normative) Sentence to support SFI collision detection . 91
F.1 General . 91
F.2 SRP – System function ID resolution protocol . 91
Annex G (informative) Examples for SRP sentences and SFI collision detection . 92
G.1 SFI collision detection . 92
G.2 Examples for SRP sentences . 92
G.2.1 Redundancy on network level only . 92
G.2.2 Examples for redundancy on network and serial (to network) level . 96
G.3 Other uses of SRP sentence . 98
Annex H (normative) Reserved cluster identifiers . 99
Bibliography . 100
List of comments . 102

Figure 1 – Network topology example . 15
Figure 2 – SNGF examples. 21
Figure 3 – SNGF example, multi SF serial port . 21
Figure 4 – Ethernet frame example for a SBM from a rate of turn sensor . 28
Figure 5 – Non re-transmittable sender process . 45
Figure 6 – Re-transmittable sender process . 47
Figure 7 – Re-transmittable receive process . 49
Figure C.1 – Command response communications . 86
Figure G.1 – Two separate network interfaces connected to the same single network. 92
Figure G.2 – An example of two equipment . 93
Figure G.3 – Two separate networks interfaces connected to the same single network,
but only one of the network interfaces is sending at any one time . 94
Figure G.4 – An example of two equipment . 94
Figure G.5 – Two separate network interfaces connected to the same single network
but a network switch makes the equipment to be seen as one . 95
Figure G.6 – An example of two equipment . 96

– 6 – IEC 61162-450:2024 CMV © IEC 2024
Figure G.7 – One equipment with two separate serial interfaces connected through
separate SNGFs to the network . 97

Table 1 – Syslog message format . 18
Table 2 – Syslog error message codes . 19
Table 3 – Interfaces, connectors and cables . 26
Table 4 – Destination multicast addresses and port numbers . 30
Table 5 – Destination multicast addresses and port numbers for binary data transfer . 31
Table 6 – Destination multicast addresses and port numbers for other services . 31
Table 7 – Description of terms . 40
Table 8 – Binary file structure . 40
Table 9 – 61162-450 header format . 41
Table 10 – Binary file descriptor format . 43
Table 11 – Examples of MIME content type for DataType codes . 43
Table 12 – Binary file data fragment format . 44
Table 13 – Structure for PGN message . 51
Table 14 – PGN message descriptor . 52
Table 15 – Description of terms . 55
Table 16 – Binary file structure . 55
Table 17 – Header structure . 56
Table 18 – Package data structure. 57
Table A.1 – Classification of IEC 61162-1 talker identifier mnemonics . 76
Table A.2 – Classification of IEC 61162-1 sentences . 78
Table B.1 – Defined parameter-codes . 85
Table H.1 – List of reserved cluster identifiers . 99

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MARITIME NAVIGATION AND RADIOCOMMUNICATION
EQUIPMENT AND SYSTEMS –
DIGITAL INTERFACES –
Part 450: Multiple talkers and multiple listeners –
Ethernet interconnection
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
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6) All users should ensure that they have the latest edition of this publication.
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
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the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
This commented version (CMV) of the official standard IEC 61162-450:2024 edition 3.0
allows the user to identify the changes made to the previous IEC 61162-450:2018
edition 2.0. Furthermore, comments from IEC TC 80 experts are provided to explain the
reasons of the most relevant changes, or to clarify any part of the content.
A vertical bar appears in the margin wherever a change has been made. Additions are in
green text, deletions are in strikethrough red text. Experts' comments are identified by a
blue-background number. Mouse over a number to display a pop-up note with the
comment.
This publication contains the CMV and the official standard. The full list of comments is
available at the end of the CMV.

– 8 – IEC 61162-450:2024 CMV © IEC 2024
IEC 61162-450 has been prepared by IEC technical committee 80: Maritime navigation and
radiocommunication equipment and systems. It is an International Standard.
This third edition cancels and replaces the second edition published in 2018. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) clarification of serial to network gateway function (SNGF) in 4.5 with the addition of two new
figures;
b) addition of further destination multicast addresses and port numbers in 6.2;
c) clarification of TAG block parameters in 7.2 together with Annex B, a new Annex H and
associated tests in 8.9.4;
d) clarification of the sender process for binary files in 7.3.6 and the receiver process for binary
files in 7.3.7 with updated Figure 6 and Figure 7;
e) clarifications of SFI collision detection and use of SRP sentence in 7.5 together with a new
Annex G;
f) revision of tests for handling malformed data received on the serial line in 8.5.5.
The text of this International Standard is based on the following documents:
Draft Report on voting
80/1094/FDIS 80/1098/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
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/publications.
A list of all parts in the IEC 61162 series, published under the general title Maritime navigation
and radiocommunication equipment and systems - Digital interfaces, 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 webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document 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.

MARITIME NAVIGATION AND RADIOCOMMUNICATION
EQUIPMENT AND SYSTEMS –
DIGITAL INTERFACES –
Part 450: Multiple talkers and multiple listeners –
Ethernet interconnection
1 Scope
This part of IEC 61162 specifies interface requirements and methods of test for high speed
communication between shipboard navigation and radiocommunication equipment as well as
between such systems and other ship systems that need to communicate with navigation and
radio-communication equipment. This document is based on the application of an appropriate
suite of existing international standards to provide a framework for implementing data transfer
between devices on a shipboard Ethernet network.
This document specifies an Ethernet based bus type network where any listener can receive
messages from any sender with the following properties.
• This document includes provisions for multicast distribution of information formatted
according to IEC 61162-1, for example position fixes and other measurements, as well as
provisions for transmission of general data blocks (binary file), for example between radar
and VDR, and also includes provisions for multicast distribution of information formatted
according to IEC 61162-3, for example position fixes and other measurements.
• This document is limited to protocols for equipment (network nodes) connected to a single
Ethernet network consisting only of OSI level one or two devices and cables (network
infrastructure).
• This document provides requirements only for equipment interfaces. By specifying protocols
for transmission of IEC 61162-1 sentences, IEC 61162-3 PGN messages and general binary
file data, these requirements will guarantee interoperability between equipment
implementing this document as well as a certain level of safe behaviour of the equipment
itself.
• This document permits equipment using other protocols than those specified in this
document to share a network infrastructure, provided that it is supplied with interfaces which
satisfy the requirements described for ONF.
• This document includes provisions for filtering of the network traffic in order to limit the
amount of traffic to manageable level for each individual equipment.
This document does not contain any system requirements other than the ones that can be
inferred from the sum of individual equipment requirements. An associated standard,
IEC 61162-460, further addresses system requirements.
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 60825-2, Safety of laser products – Part 2: Safety of optical fibre communication systems
(OFCSs)
– 10 – IEC 61162-450:2024 CMV © IEC 2024
IEC 60945, Maritime navigation and radiocommunication equipment and systems – General
requirements – Methods of testing and required test results
IEC 61162-1:2016, Maritime navigation and radiocommunication equipment and systems –
Digital interfaces – Part 1: Single talker and multiple listeners 1
IEC 61162-3:2008, Maritime navigation and radiocommunication equipment and systems –
Digital interfaces – Part 3: Serial data instrument network 1
IEEE Std 802.3-20152022, IEEE Standard for Ethernet 2
ISOC RFC 768, User Datagram Protocol, Standard STD0006
ISOC RFC 791, Internet Protocol (IP), Standard STD0005 (and updates)
ISOC RFC 792, Internet Control Message Protocol (ICMP), Standard STD0005 (and updates) 3
RFC 793:1981, Transmission Control Protocol (TCP) 3
ISOC RFC 826, An ethernet Address Resolution Protocol
ISOC RFC 1112, Host Extensions for IP Multicasting, Standard STD0005 (and updates),
(include IGMP version 1)
ISOC RFC 1918, Address Allocation for Private Internets, Best Current Practice BCP0005
ISOC RFC 2236, Internet Group Management Protocol, Version 2
ISOC RFC 2474, Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6
Headers
ISOC RFC 3376, Internet Group Management Protocol, Version 3
ISOC RFC 5000, Internet Official Protocol Standards, Standard 0001
ISOC RFC 5227, IPv4 Address Conflict Detection
ISOC RFC 5424, The Syslog Protocol
NMEA 0183:2008, Standard for interfacing marine electronic devices, Version 4.00 3
NOTE The standards of the Internet Society (ISOC) are available on the IETF websites http://www.ietf.org. Later
updates can be tracked at http://www.rfc-editor.org/rfcsearch.html.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp

3.1
ASCII
printable 7 bit character encoded in one byte
3.2
binary file
data block without formatting known to this protocol, i.e., non IEC 61162-1 formatted data,
which can be transmitted with the protocol defined in 7.3 or in 7.5
Note 1 to entry: The term "binary file" is used to differentiate the general data transfer protocol (which may or may
not be in ordinary text format) from the transmission of sentences that is always in 7 bit ASCII format.
3.3
byte
group of 8 bits treated as one unit
Note 1 to entry: This corresponds to what is also sometimes called an "octet".
3.4
command-response pair
CRP
messages exchanged between parties that synchronize state changes on both sides through
the exchange
Note 1 to entry: CRP are defined in Annex A.
Note 2 to entry: Both the command and the reply message may also be used as a sensor broadcast message in
some cases. Thus, the implementation of the semantics of the message exchange is somewhat different between
different users of the exchange.
3.5
datagram
atomic UDP transmission unit on the Ethernet as defined in ISOC RFC 768 and as constrained
elsewhere in this document
3.6
Ethernet
carrier sense, multiple access collision detect (CSMA/CD) local area network protocol standard
as defined in IEEE Std 802.3 and later revisions and additions to IEEE 802
Note 1 to entry: The types of Ethernet media that can be used for implementation of this document are defined in
Clause 5.
3.7
function block
specified functionality implemented by equipment
Note 1 to entry: Equipment normally implements multiple function blocks. Requirements to equipment are the sum
of requirements to the function blocks it implements. Function blocks are defined in Clause 4.
3.8
Internet Group Management Protocol
IGMP
communications protocol used by hosts and adjacent routers on IPv4 networks to establish
multicast group memberships
Note 1 to entry: The IGMP is an integral part of IP multicast.
3.9
IGMP snooping
process of listening to Internet Group Management Protocol (IGMP) network traffic

– 12 – IEC 61162-450:2024 CMV © IEC 2024
3.10
Internet assigned number authority
IANA
global coordination of the Domain Name Server (DNS) Root, IP addressing, and other Internet
protocol resources, including UDP and TCP port numbers
Note 1 to entry: The currently assigned numbers are listed in http://www.iana.org/assignments/port-numbers.
3.11
Internet protocol
IP
signalling protocol used and defined in ISOC RFC 791 (and updates)
3.12
message
collection of one or more sentences that are grouped by use of the TAG block grouping protocol
or 4 mechanisms internal to the sentence, for instance by sequence numbers as in the TXT
sentence
Note 1 to entry: A stand-alone sentence is a message.
3.13
message type
classification of IEC 61162-1 sentence formatters into SBM, MSM and CRP types
Note 1 to entry: SBM, MSM and CRP types are defined in Annex A.
Note 2 to entry: This document defines different requirements to the transmission of different message types.
3.14
multi-sentence message
MSM
logical group of messages and/or sentences where the full meaning of the group is dependent
on the receiver reading the full group
Note 1 to entry: Multi-sentence messages that are grouped together with a TAG construct are also a sentence
group.
Note 2 to entry: MSM are defined in Annex A.
3.15
network
physical Ethernet network with one Internet address space, consisting only of the network
nodes, switches, cables and supporting equipment such as power supply units
3.16
network function block
NF
function block responsible for physical connectivity to the network and connectivity to the
transport layer as described in 4.3
3.17
network infrastructure
part of the network that provides a transmission path between network nodes
Note 1 to entry: The network nodes are not part of the network infrastructure.

3.18
network node
physical device connected to the network and which have an Internet address
Note 1 to entry: A network node is also called an "Internet host".
Note 2 to entry: A network node will normally correspond to equipment. "Equipment” is used in this document.
3.19
other network function block
ONF
function block that interfaces to the network, but
...