SIST EN IEC 61162-450:2018

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Maritime navigation and radiocommunication equipment and systems - Digital interfaces
- Part 450: Multiple talkers and multiple listeners - Ethernet interconnection (IEC 61162-
450:2018)
Navigations- und Funkkommunikationsgeräte und -systeme für die Seeschifffahrt -
Digitale Schnittstellen - Teil 450: Mehrere Datensender und mehrere Datenempfänger -
Ethernet-Verbund (IEC 61162-450:2018)
Matériels et systèmes de navigation et de radiocommunication maritimes - Interfaces
numériques - Partie 450: Emetteurs multiples et récepteurs multiples - Interconnexion
Ethernet (IEC 61162-450:2018)
Ta slovenski standard je istoveten z: EN IEC 61162-450:2018
ICS:
33.060.01 Radijske komunikacije na Radiocommunications in
splošno general
47.020.70 Navigacijska in krmilna Navigation and control
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61162-450

NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2018
ICS 47.020.70 Supersedes EN 61162-450:2011
English Version
Maritime navigation and radiocommunication equipment and
systems - Digital interfaces - Part 450: Multiple talkers and
multiple listeners - Ethernet interconnection
(IEC 61162-450:2018)
Matériels et systèmes de navigation et de Navigations- und Funkkommunikationsgeräte und -systeme
radiocommunication maritimes - Interfaces numériques - für die Seeschifffahrt - Digitale Schnittstellen -
Partie 450: Emetteurs multiples et récepteurs multiples - Teil 450: Mehrere Datensender und mehrere
Interconnexion Ethernet Datenempfänger - Ethernet-Verbund
(IEC 61162-450:2018) (IEC 61162-450:2018)
This European Standard was approved by CENELEC on 2018-06-08. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61162-450:2018 E

European foreword
The text of document 80/880/FDIS, future edition 2 of IEC 61162-450, prepared by
IEC/TC 80 "Maritime navigation and radiocommunication equipment and systems" was submitted to
the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 61162-450:2018.

The following dates are fixed:
(dop) 2019-03-08
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-06-08
standards conflicting with the
document have to be withdrawn
This document supersedes EN 61162-450:2011.

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 61162-450:2018 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60603-7 NOTE Harmonized as EN 60603-7.
IEC 60603-7-3 NOTE Harmonized as EN 60603-7-3.
IEC 60603-7-7 NOTE Harmonized as EN 60603-7-7.
IEC 61076-2-101 NOTE Harmonized as EN 61076-2-101.
IEC 61162-2 NOTE Harmonized as EN 61162-2.
IEC 61162-450:2011 NOTE Harmonized as EN 61162-450:2011 (not modified).
IEC 61162-460 NOTE Harmonized as EN 61162-460.
IEC 61174 NOTE Harmonized as EN 61174.
IEC 61754-20 NOTE Harmonized as EN 61754-20.
IEC 61996-1 NOTE Harmonized as EN 61996-1.
IEC 62388:2007 NOTE Harmonized as EN 62388:2008 (not modified).

Superseded by EN 62388:2013 (IEC 62388:2013).
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year

IEC 60825-2 -  Safety of laser products - EN 60825-2 -
Part 2: Safety of optical fibre
communication systems (OFCS)
IEC 60945 -  Maritime navigation and EN 60945 -
radiocommunication equipment and
systems - General requirements -
Methods of testing and required test results
IEC 61162-1 2016 Maritime navigation and EN 61162-1 2016
radiocommunication equipment
and systems - Digital interfaces -
Part 1: Single talker and multiple listeners
IEC 61162-3 2008 Maritime navigation and EN 61162-3 2008
radiocommunication equipment and
systems - Digital interfaces -
Part 3: Serial data instrument network
IEEE Std 802.3 2015 IEEE Standard for Ethernet - -
IETF RFC 768 -  User Datagram Protocol - -
IETF RFC 791 -  Internet Protocol (IP) - DARPA Internet - -
Program Protocol Specification
IETF RFC 792 -  Internet Control Message Protocol (ICMP) - -
IETF RFC 793 1981 Transmission Control Protocol (TCP) - -
IETF RFC 826 -  An Ethernet Address Resolution Protocol - -
IETF RFC 1112 -  Host Extensions for IP multicasting - -
IETF RFC 1918 -  Address Allocation for Private Internets - -
IETF RFC 2236 -  Internet Group Management Protocol, - -
Version 2
IETF RFC 2474 -  Definition of the Differentiated Services - -
Field (DS Field) in the IPv4 and IPv6
Headers
IETF RFC 3376 -  Internet Group Management Protocol, - -
Version 3
Publication Year Title EN/HD Year

IETF RFC 5000 -  Internet Official Protocol Standards - -
IETF RFC 5227 -  IPv4 Address Conflict Detection - -
IETF RFC 5424 -  The Syslog Protocol - -
NMEA 0183 2008 Standard for interfacing marine electronic - -
devices, Version 4.00
IEC 61162-450 ®
Edition 2.0 2018-05
INTERNATIONAL
STANDARD
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 978-2-8322-5636-7

– 2 – IEC 61162-450:2018 © IEC 2018
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 Assignment of unique system function ID (SFI) . 19
4.4.3 Implementing configurable transmission groups . 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 . 21
4.5.3 Datagram output requirements . 22
4.5.4 Multi SF serial port . 22
4.5.5 Handling malformed data received on serial line . 22
4.6 PGN to network gateway function (PNGF) requirements . 23
4.6.1 General requirements . 23
4.6.2 Output buffer management from IEC 61162-450 network to IEC 61162-3
network. 23
4.6.3 Datagram output requirements . 23
4.6.4 PGN group number . 23
4.7 Other network function (ONF) requirements . 24
5 Low level network requirements . 24
5.1 Electrical and mechanical requirements . 24
5.2 Network protocol requirements. 25
5.3 IP address assignment for equipment . 26
5.4 Multicast address range . 26
5.5 Device address for instrument networks . 26
6 Transport layer specification . 26
6.1 General . 26
6.2 UDP messages . 27
6.2.1 UDP multicast protocol . 27
6.2.2 Use of multicast addresses and port numbers . 27
6.2.3 UDP checksum . 29
6.2.4 Datagram size . 29
7 Application layer specification . 30
7.1 Datagram header . 30

IEC 61162-450:2018 © IEC 2018 – 3 –
7.1.1 Valid header . 30
7.1.2 Error logging . 30
7.2 General IEC 61162-1 sentence transmissions . 30
7.2.1 Application of this protocol . 30
7.2.2 Types of messages for which this protocol can be used . 30
7.2.3 TAG block parameters for sentences transmitted in the datagram . 30
7.2.4 Requirements for processing incoming datagrams . 34
7.2.5 Error logging for processing incoming datagrams . 34
7.3 Binary file transfer using UDP multicast – Single transmitter, multiple
receivers . 34
7.3.1 Application of this protocol . 34
7.3.2 Binary file structure. 35
7.3.3 61162-450 header . 35
7.3.4 Binary file descriptor structure . 37
7.3.5 Binary file data fragment . 38
7.3.6 Sender process for binary file transfer . 39
7.3.7 Receiver process for binary file transfer . 42
7.3.8 Other requirements . 44
7.3.9 Error logging . 46
7.4 General IEC 61162-3 PGN message transmissions . 46
7.4.1 Message structure . 46
7.4.2 Message format . 47
7.4.3 Address translation requirements. 47
7.4.4 Message processing . 48
7.4.5 Additional management requirements . 48
7.5 System function ID resolution. 48
7.5.1 General . 48
7.5.2 Transmitter functions . 49
7.6 Binary file transfer using TCP point-to-point . 49
7.6.1 Definition . 49
7.6.2 Data field structure for transfer of files . 50
7.6.3 Structure of the transfer stream . 52
7.6.4 TCP port and IP addresses . 52
7.6.5 Implementation guidance . 52
8 Methods of test and required results . 53
8.1 Test set-up and equipment . 53
8.2 Basic requirements . 54
8.2.1 Equipment to be connected to the network . 54
8.2.2 Network infrastructure equipment . 54
8.2.3 Documentation . 54
8.3 Network function (NF) . 54
8.3.1 Maximum data rate . 54
8.3.2 Error logging function . 55
8.4 System function block (SF) . 55
8.4.1 General . 55
8.4.2 Assignment of unique system function ID (SFI) . 55
8.4.3 Implementing configurable transmission groups . 55
8.5 Serial to network gateway function (SNGF) . 55
8.5.1 General . 55

– 4 – IEC 61162-450:2018 © IEC 2018
8.5.2 Serial line output buffer management . 56
8.5.3 Datagram output . 56
8.5.4 Datagram output multi SF serial port . 56
8.5.5 Handling malformed data received on serial line . 57
8.6 Other network function (ONF) . 58
8.7 Low level network . 59
8.7.1 Electrical and mechanical requirements . 59
8.7.2 Network protocol. 59
8.7.3 IP address assignment for equipment . 59
8.7.4 Multicast address range . 59
8.8 Transport layer . 59
8.9 Application layer . 60
8.9.1 Application . 60
8.9.2 Datagram header . 60
8.9.3 Types of messages . 60
8.9.4 TAG block parameters . 60
8.9.5 General authentication . 61
8.10 Error logging . 62
8.11 Binary file transfer using UDP multicast – Single transmitter, multiple
receiver . 62
8.11.1 Sender process test . 62
8.11.2 Receiver process test . 63
8.11.3 Binary file descriptor test . 64
8.11.4 Binary file transfer error logging . 64
8.11.5 Maximum outgoing rate . 65
8.12 PGN to network gateway function (PNGF). 65
8.12.1 General . 65
8.12.2 Output buffer management . 65
8.12.3 Datagram output . 65
8.12.4 PGN group . 65
8.12.5 Address conflicts . 65
8.13 System function ID resolution. 65
8.14 Binary file transfer using TCP point-to-point . 65
8.14.1 Test of transmit client . 66
8.14.2 Test of receiver server . 66
8.14.3 Maximum outgoing rate . 67
8.14.4 TCP port and IP addresses . 67
Annex A (normative) Classification of IEC 61162-1 talker identifier mnemonics and
sentences . 68
A.1 General . 68
A.2 Talker identifier mnemonic to transmission group mapping . 68
A.3 List of all sentence formatters and the sentence type . 70
Annex B (normative) TAG block definitions . 74
B.1 Validity . 74
B.2 Valid TAG block characters . 74
B.3 TAG block format . 74
B.4 TAG block "hexadecimal checksum" (*hh) . 75
B.5 TAG block "line" . 75
B.6 TAG block parameter-code dictionary . 76

IEC 61162-450:2018 © IEC 2018 – 5 –
Annex C (normative) Reliable transmission of command-response pair messages . 77
C.1 Purpose . 77
C.2 Information exchange examples . 77
C.3 Characteristics . 77
C.4 Requirements . 77
C.5 Data flow description . 78
C.5.1 Heartbeat message . 78
C.5.2 Command response pair . 78
Annex D (informative) Compatibility between IEC 61162-450 nodes based on
IEC 61162-450:2011 connected to network which uses methods based on IEC 61162-
450:2018 . 79
D.1 General . 79
D.2 Alternative methods for compatibility . 79
D.2.1 Use of IGMP proxy node . 79
D.2.2 Use of virtual LAN (VLAN) . 79
D.2.3 Use of static multicast switch configuration . 80
Annex E (informative) Use of switch setup configuration to filter network traffic . 81
Annex F (normative) Sentence to support SFI collision detection . 82
F.1 General . 82
F.2 SRP – System function ID resolution protocol . 82
Bibliography . 83

Figure 1 – Network topology example . 15
Figure 2 – Ethernet frame example for a SBM from a rate of turn sensor . 27
Figure 3 – Non re-transmittable sender process . 40
Figure 4 – Re-transmittable sender process . 42
Figure 5 – Re-transmittable receive process . 44
Figure C.1 – Command response communications . 77

Table 1 – Syslog message format . 18
Table 2 – Syslog error message codes . 19
Table 3 – Interfaces, connectors and cables . 25
Table 4 – Destination multicast addresses and port numbers . 28
Table 5 – Destination multicast addresses and port numbers for binary data transfer. 29
Table 6 – Destination multicast addresses and port numbers for other services . 29
Table 7 – Description of terms . 35
Table 8 – Binary file structure . 35
Table 9 – 61162-450 header format . 36
Table 10 – Binary file descriptor format . 38
Table 11 – Examples of MIME content type for DataType codes . 38
Table 12 – Binary file data fragment format . 38
Table 13 – Structure for PGN message . 46
Table 14 – PGN message descriptor . 47
Table 15 – Description of terms . 49
Table 16 – Binary file structure . 50

– 6 – IEC 61162-450:2018 © IEC 2018
Table 17 – Header structure . 50
Table 18 – Package data structure . 51
Table A.1 – Classification of IEC 61162-1 talker identifier mnemonics . 68
Table A.2 – Classification of IEC 61162-1 sentences . 70
Table B.1 – Defined parameter-codes . 76

IEC 61162-450:2018 © IEC 2018 – 7 –
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 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,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC
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-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates
closely 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
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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 61162-450 has been prepared by IEC technical committee 80:
Maritime navigation and radiocommunication equipment and systems.
This second edition of IEC 61162-450 cancels and replaces the first edition published in 2011
and Amendment 1:2016. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) network traffic filtering based on IGMP snooping added;
b) network traffic balancing added;
c) new encapsulation of IEC 61162-3 PGNs added;

– 8 – IEC 61162-450:2018 © IEC 2018
d) new alternative for binary file transfer added: TCP/IP based on Annex H of
IEC 62388:2007 on radars;
e) general authentication tag "a:" added to support managing of cyber security risk.
The text of this International Standard is based on the following documents:
FDIS Report on voting
80/880/FDIS 80/885/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 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 "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.

IEC 61162-450:2018 © IEC 2018 – 9 –
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
(OFCS)
– 10 – IEC 61162-450:2018 © IEC 2018
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
IEC 61162-3:2008, Maritime navigation and radiocommunication equipment and systems –
Digital interfaces – Part 3: Serial data instrument network
IEEE Std 802.3-2015, IEEE Standard for Ethernet
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)
RFC 793:1981, Transmission Control Protocol (TCP)
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
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.
3.1
ASCII
printable 7 bit character encoded in one byte

IEC 61162-450:2018 © IEC 2018 – 11 –
3.2
binary file
data block without formatting known to this protocol, i.e., non IEC 61162-1 formatted data,
that 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 61162-450:2018 © IEC 2018
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 t
...