ISO 21792:2019
(Main)Ships and marine technology — Navigation and ship operations — Guidelines for onboard telephone equipment
Ships and marine technology — Navigation and ship operations — Guidelines for onboard telephone equipment
This document provides general and specific recommendations related to the quality of communication, connectivity, installation, performance and maintenance of onboard telephone equipment, including automatic telephones, common battery telephones, battery-less telephones and sound-powered telephones. It also specifies requirements for the related performance tests (shop tests and onsite tests) and for the maintenance tests. It is not applicable to digital telephones, LAN (VoIP) telephones, and wireless telephones. NOTE These telephones are excluded because they were under development during the elaboration of this document so that their specifications remained to be determined.
Navires et technologie maritime — Navigation et opérations maritimes — Lignes directrices concernant le matériel téléphonique embarqué
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INTERNATIONAL ISO
STANDARD 21792
First edition
2019-08
Ships and marine technology —
Navigation and ship operations —
Guidelines for onboard telephone
equipment
Navires et technologie maritime — Navigation et opérations
maritimes — Lignes directrices concernant le matériel téléphonique
embarqué
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Types of telephones . 1
4 General characteristics . 2
4.1 General . 2
4.2 Automatic telephones . 3
4.3 Common battery telephones . 4
4.4 Battery-less telephones . 4
4.5 Sound-powered telephones . 4
5 Quality . 4
5.1 General . 4
5.2 Measures to prevent howling . 4
5.3 Measures to suppress noise . 4
6 Data recommendations — Automatic telephones . 5
6.1 General . 5
6.2 Multifunction telephones . 5
6.2.1 Signal condition . 5
6.3 Analog telephone . 5
6.3.1 Signal condition . 5
6.3.2 Output signal . 5
6.3.3 Input signal . 6
6.4 Connection to external communication equipment . 6
6.4.1 Signal condition . 6
6.4.2 Output signal . 6
6.4.3 Input signal . 6
7 Installation . 6
7.1 General . 6
7.2 Environment . 6
7.2.1 Temperature . 6
7.2.2 Vibration and swinging motion . 7
7.2.3 Dust and water protection . 7
7.3 Explosion protection . 7
7.4 Cabling . 7
8 Performance tests . 8
8.1 General . 8
8.2 Shop test . 8
8.3 Onsite test .11
8.3.1 General.11
8.3.2 Automatic telephones .11
8.3.3 Common battery telephones, battery-less telephones and sound-powered
telephones .13
9 Maintenance .14
9.1 General .14
9.2 Routine maintenance .14
9.3 Periodic maintenance.14
9.3.1 Method .14
9.3.2 Measures against corrosion .15
9.4 Periodic maintenance programme and procedures .15
9.4.1 Automatic telephones .15
9.4.2 Common battery telephones, battery-less telephones and sound-powered
telephones .16
9.5 Replacement period .16
Bibliography .18
iv © ISO 2019 – All rights reserved
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 6, Navigation and ship operations.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
Introduction
Onboard telephone equipment generally includes automatic telephones, common battery telephones,
battery-less telephones and sound-powered telephones.
Until now, there have been no comprehensive standards for onboard telephone equipment provided by
different manufacturers, and this has impeded the equipment improvements of reliability.
This document will promote
...
INTERNATIONAL ISO
STANDARD 21792
First edition
2019-08
Ships and marine technology —
Navigation and ship operations —
Guidelines for onboard telephone
equipment
Navires et technologie maritime — Navigation et opérations
maritimes — Lignes directrices concernant le matériel téléphonique
embarqué
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Types of telephones . 1
4 General characteristics . 2
4.1 General . 2
4.2 Automatic telephones . 3
4.3 Common battery telephones . 4
4.4 Battery-less telephones . 4
4.5 Sound-powered telephones . 4
5 Quality . 4
5.1 General . 4
5.2 Measures to prevent howling . 4
5.3 Measures to suppress noise . 4
6 Data recommendations — Automatic telephones . 5
6.1 General . 5
6.2 Multifunction telephones . 5
6.2.1 Signal condition . 5
6.3 Analog telephone . 5
6.3.1 Signal condition . 5
6.3.2 Output signal . 5
6.3.3 Input signal . 6
6.4 Connection to external communication equipment . 6
6.4.1 Signal condition . 6
6.4.2 Output signal . 6
6.4.3 Input signal . 6
7 Installation . 6
7.1 General . 6
7.2 Environment . 6
7.2.1 Temperature . 6
7.2.2 Vibration and swinging motion . 7
7.2.3 Dust and water protection . 7
7.3 Explosion protection . 7
7.4 Cabling . 7
8 Performance tests . 8
8.1 General . 8
8.2 Shop test . 8
8.3 Onsite test .11
8.3.1 General.11
8.3.2 Automatic telephones .11
8.3.3 Common battery telephones, battery-less telephones and sound-powered
telephones .13
9 Maintenance .14
9.1 General .14
9.2 Routine maintenance .14
9.3 Periodic maintenance.14
9.3.1 Method .14
9.3.2 Measures against corrosion .15
9.4 Periodic maintenance programme and procedures .15
9.4.1 Automatic telephones .15
9.4.2 Common battery telephones, battery-less telephones and sound-powered
telephones .16
9.5 Replacement period .16
Bibliography .18
iv © ISO 2019 – All rights reserved
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 6, Navigation and ship operations.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
Introduction
Onboard telephone equipment generally includes automatic telephones, common battery telephones,
battery-less telephones and sound-powered telephones.
Until now, there have been no comprehensive standards for onboard telephone equipment provided by
different manufacturers, and this has impeded the equipment improvements of reliability.
This document will promote
...
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