EN IEC 62684:2018
(Main)Interoperability specifications of common external power supply (EPS) for use with data-enabled mobile telephones
Interoperability specifications of common external power supply (EPS) for use with data-enabled mobile telephones
NEW!IEC 62684:2018 is available as IEC 62684:2018 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 62684:2018 specifies the interoperability of common external power supplies for use with data-enabled mobile telephones. It defines the common charging capability and specifies interface requirements for the external power supply. Safety and EMC aspects are not covered by this document. Safety is covered by IEC 60950-1 or IEC 62368-1 and EMC is covered by regional /national standards. This document defines interoperability based on legacy USB technologies and does not cover charging interfaces that implement IEC 62680-1-3, IEC 62680-1-2 and IEC 63002. This second edition cancels and replaces the first edition published in 2011. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Clause 1 is modified to include updated references to IEC Universal Serial Bus interface standards; b) Clause 2 is expanded to include references to IEC Universal Serial Bus interface standards; c) Subclause 4.1 is expanded to include requirements for non USB Micro-B plug DC plug connectors; d) Subclause 4.4 is modified to remove obsolete requirements for common mode noise and reference requirements of IEC Universal Serial Bus interface standards; e) Subclause 4.5 is modified to reference appropriate safety standards.
Spezifikationen für die Interoperabilität eines einheitlichen externen Stromversorgungsgeräts (EPS) für die Anwendung bei datenübertragungsfähigen Mobiltelefonen
Spécifications d’interopérabilité de l’alimentation externe commune (EPS) avec des téléphones mobiles permettant l’échange de données
NEW!IEC 62684:2018 est disponible sous forme de IEC 62684:2018 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
Specifikacije medobratovalnosti skupnega zunanjega napajanja (EPS) z mobilnimi telefoni, ki omogočajo izmenjavo podatkov
Ta dokument določa medobratovalnost skupnega zunanjega napajanja z mobilnimi telefoni, ki omogočajo izmenjavo podatkov. Opredeljuje možnost skupnega napajanja in določa zahteve za vmesnike za zunanje napajanje.
Vidiki varnosti in elektromagnetne združljivosti v tem dokumentu niso zajeti. Varnost je zajeta v standardu IEC 60950-1 ali IEC 62368-1, elektromagnetna združljivost pa je zajeta v regionalnih/nacionalnih standardih.
Ta dokument opredeljuje medobratovalnost na podlagi podedovanih tehnologij USB in ne zajema vmesnikov za polnjenje, ki izvajajo standarde IEC 62680-1-3 (USB Type-C™1), IEC 62680-1-2 (USB PD) in IEC 63002.
OPOMBA: Vsebina tega dokumenta temelji na Dodatku II z dne 12. januarja 2010 k memorandumu o soglasju glede usklajevanja zmožnosti polnjenja za mobilne telefone.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 62684:2019
01-januar-2019
1DGRPHãþD
SIST EN 62684:2011
6SHFLILNDFLMHPHGREUDWRYDOQRVWLVNXSQHJD]XQDQMHJDQDSDMDQMD (36 ]PRELOQLPL
WHOHIRQLNLRPRJRþDMRL]PHQMDYRSRGDWNRY
Interoperability specifications of common external power supply (EPS) for use with data-
enabled mobile telephones
Spezifikationen für die Interoperabilität eines einheitlichen externen
Stromversorgungsgeräts (EPS) für die Anwendung bei datenübertragungs-fähigen
Mobiltelefonen
Spécifications d’interopérabilité de l’alimentation externe commune (EPS) avec des
téléphones mobiles permettant l’échange de données
Ta slovenski standard je istoveten z: EN IEC 62684:2018
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST EN 62684:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
SIST EN 62684:2019
SIST EN 62684:2019
EUROPEAN STANDARD EN IEC 62684
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2018
ICS 33.070.50 Supersedes EN 62684:2010
English Version
Interoperability specifications of common external power supply
(EPS) for use with data-enabled mobile telephones
(IEC 62684:2018)
Spécifications d'interopérabilité de l'alimentation externe Spezifikationen für die Interoperabilität eines einheitlichen
commune (EPS) avec des téléphones mobiles permettant externen Stromversorgungsgeräts (EPS) für die
l'échange de données Anwendung bei datenübertragungsfähigen Mobiltelefonen
(IEC 62684:2018) (IEC 62684:2018)
This European Standard was approved by CENELEC on 2018-03-12. 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 62684:2018 E
SIST EN 62684:2019
European foreword
The text of document 100/2872/CDV, future edition 2 of IEC 62684, prepared by technical area 14:
"Interfaces and methods of measurement for personal computing equipment", of IEC/TC 100: "Audio,
video and multimedia systems and equipment" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN IEC 62684:2018.
The following dates are fixed:
(dop) 2018-12-12
• 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) 2021-03-12
standards conflicting with the
document have to be withdrawn
This document supersedes EN 62684:2010.
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.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association.
Endorsement notice
The text of the International Standard IEC 62684:2018 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 62680-1-2 NOTE Harmonized as EN 62680-1-2.
IEC 62680-1-3 NOTE Harmonized as EN 62680-1-3.
IEC 63002 NOTE Harmonized as EN 63002.
SIST EN 62684:2019
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 60950-1 - Information technology equipment - Safety EN 60950-1 -
- Part 1: General requirements
IEC 62368-1 - Audio/video, information and EN 62368-1 -
communication technology equipment --
Part 1: Safety requirements
IEC 62680-1-1 - Universal Serial Bus interfaces for data EN 62680-1-1 -
and power Part 1-1:Universal Serial Bus
interfaces - common components - USB
Battery Charging Specification, Revision
1.2 (TA 14)
IEC 62680-2-1 2015 Universal Serial Bus interfaces for data - -
and power Part 2-1: Universal Serial Bus
Specification, Revision 2.0 (TA 14)
IEC 62680-2-2 - Universal Serial Bus interfaces for data EN 62680-2-2 -
and power Part 2-2: Universal Serial Bus -
Micro-USB Cables and Connectors
Specification, Revision 1.01 (TA 14)
SIST EN 62684:2019
SIST EN 62684:2019
IEC 62684 ®
Edition 2.0 2018-02
INTERNATIONAL
STANDARD
Interoperability specifications of common external power supplies (EPS) for use
with data-enabled mobile telephones
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.200; 35.100.05; 35.200 ISBN 978-2-8322-5340-3
SIST EN 62684:2019
– 2 – IEC 62684:2018 © IEC 2018
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms, definitions and abbreviated terms . 5
3.1 Terms and definitions . 5
3.2 Abbreviated terms . 6
4 EPS specification . 6
4.1 DC plug connector specification . 6
4.2 AC input characteristic . 6
4.3 Environmental specification . 7
4.4 DC output characteristics . 7
4.5 Protection . 7
4.6 EPS detection . 7
4.7 Reliability . 7
5 Testing requirements . 7
5.1 General . 7
5.2 Ripple voltage at the DC output . 7
Bibliography . 9
SIST EN 62684:2019
IEC 62684:2018 © IEC 2018 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INTEROPERABILITY SPECIFICATIONS OF COMMON
EXTERNAL POWER SUPPLIES (EPS) FOR USE WITH
DATA-ENABLED MOBILE TELEPHONES
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 62684 has been prepared by technical area 14: Interfaces and
methods of measurement for personal computing equipment, of IEC technical committee 100:
Audio, video and multimedia systems and equipment.
This second edition cancels and replaces the first edition published in 2011. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Clause 1 is modified to include updated references to IEC Universal Serial Bus interface
standards;
b) Clause 2 is expanded to include references to IEC Universal Serial Bus interface
standards;
c) Subclause 4.1 is expanded to include requirements for non USB Micro-B plug DC plug
connectors;
SIST EN 62684:2019
– 4 – IEC 62684:2018 © IEC 2018
d) Subclause 4.4 is modified to remove obsolete requirements for common mode noise and
reference requirements of IEC Universal Serial Bus interface standards;
e) Subclause 4.5 is modified to reference appropriate safety standards.
The text of this standard is based on the following documents:
CDV Report on voting
100/2872/CDV 100/2966/RVC
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.
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
...
SLOVENSKI STANDARD
01-januar-2019
Nadomešča:
SIST EN 62684:2011
Specifikacije medobratovalnosti skupnega zunanjega napajanja (EPS) z mobilnimi
telefoni, ki omogočajo izmenjavo podatkov
Interoperability specifications of common external power supply (EPS) for use with data-
enabled mobile telephones
Spezifikationen für die Interoperabilität eines einheitlichen externen
Stromversorgungsgeräts (EPS) für die Anwendung bei datenübertragungs-fähigen
Mobiltelefonen
Spécifications d’interopérabilité de l’alimentation externe commune (EPS) avec des
téléphones mobiles permettant l’échange de données
Ta slovenski standard je istoveten z: EN IEC 62684:2018
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 62684
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2018
ICS 33.070.50 Supersedes EN 62684:2010
English Version
Interoperability specifications of common external power supply
(EPS) for use with data-enabled mobile telephones
(IEC 62684:2018)
Spécifications d'interopérabilité de l'alimentation externe Spezifikationen für die Interoperabilität eines einheitlichen
commune (EPS) avec des téléphones mobiles permettant externen Stromversorgungsgeräts (EPS) für die
l'échange de données Anwendung bei datenübertragungsfähigen Mobiltelefonen
(IEC 62684:2018) (IEC 62684:2018)
This European Standard was approved by CENELEC on 2018-03-12. 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 62684:2018 E
European foreword
The text of document 100/2872/CDV, future edition 2 of IEC 62684, prepared by technical area 14:
"Interfaces and methods of measurement for personal computing equipment", of IEC/TC 100: "Audio,
video and multimedia systems and equipment" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN IEC 62684:2018.
The following dates are fixed:
(dop) 2018-12-12
• 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) 2021-03-12
standards conflicting with the
document have to be withdrawn
This document supersedes EN 62684:2010.
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.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association.
Endorsement notice
The text of the International Standard IEC 62684:2018 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 62680-1-2 NOTE Harmonized as EN 62680-1-2.
IEC 62680-1-3 NOTE Harmonized as EN 62680-1-3.
IEC 63002 NOTE Harmonized as EN 63002.
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 60950-1 - Information technology equipment - Safety EN 60950-1 -
- Part 1: General requirements
IEC 62368-1 - Audio/video, information and EN 62368-1 -
communication technology equipment --
Part 1: Safety requirements
IEC 62680-1-1 - Universal Serial Bus interfaces for data EN 62680-1-1 -
and power Part 1-1:Universal Serial Bus
interfaces - common components - USB
Battery Charging Specification, Revision
1.2 (TA 14)
IEC 62680-2-1 2015 Universal Serial Bus interfaces for data - -
and power Part 2-1: Universal Serial Bus
Specification, Revision 2.0 (TA 14)
IEC 62680-2-2 - Universal Serial Bus interfaces for data EN 62680-2-2 -
and power Part 2-2: Universal Serial Bus -
Micro-USB Cables and Connectors
Specification, Revision 1.01 (TA 14)
IEC 62684 ®
Edition 2.0 2018-02
INTERNATIONAL
STANDARD
Interoperability specifications of common external power supplies (EPS) for use
with data-enabled mobile telephones
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.200; 35.100.05; 35.200 ISBN 978-2-8322-5340-3
– 2 – IEC 62684:2018 © IEC 2018
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms, definitions and abbreviated terms . 5
3.1 Terms and definitions . 5
3.2 Abbreviated terms . 6
4 EPS specification . 6
4.1 DC plug connector specification . 6
4.2 AC input characteristic . 6
4.3 Environmental specification . 7
4.4 DC output characteristics . 7
4.5 Protection . 7
4.6 EPS detection . 7
4.7 Reliability . 7
5 Testing requirements . 7
5.1 General . 7
5.2 Ripple voltage at the DC output . 7
Bibliography . 9
IEC 62684:2018 © IEC 2018 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INTEROPERABILITY SPECIFICATIONS OF COMMON
EXTERNAL POWER SUPPLIES (EPS) FOR USE WITH
DATA-ENABLED MOBILE TELEPHONES
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 62684 has been prepared by technical area 14: Interfaces and
methods of measurement for personal computing equipment, of IEC technical committee 100:
Audio, video and multimedia systems and equipment.
This second edition cancels and replaces the first edition published in 2011. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Clause 1 is modified to include updated references to IEC Universal Serial Bus interface
standards;
b) Clause 2 is expanded to include references to IEC Universal Serial Bus interface
standards;
c) Subclause 4.1 is expanded to include requirements for non USB Micro-B plug DC plug
connectors;
– 4 – IEC 62684:2018 © IEC 2018
d) Subclause 4.4 is modified to remove obsolete requirements for common mode noise and
reference requirements of IEC Universal Serial Bus interface standards;
e) Subclause 4.5 is modified to reference appropriate safety standards.
The text of this standard is based on the following documents:
CDV Report on voting
100/2872/CDV 100/2966/RVC
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.
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 th
...
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