EN IEC 60027-2:2019
(Main)Letter symbols to be used in electrical technology - Part 2: Telecommunications and electronics
Letter symbols to be used in electrical technology - Part 2: Telecommunications and electronics
Defines rules for the use and writing of letter symbols for telecommunications and electronics.
Formelzeichen für die Elektrotechnik - Teil 2: Telekommunikation und Elektronik
Symboles littéraux à utiliser en électrotechnique - Partie 2: Télécommunications et électronique
IEC 60027-2:2019 s'applique aux télécommunications et à l'électronique. Elle donne les noms et symboles des grandeurs et unités.
Črkovni simboli za uporabo v elektrotehniki - 2. del: Telekomunikacije in elektronika (IEC 60027-2:2019)
Ta del standarda IEC 60027 se uporablja za telekomunikacije in elektroniko. Podaja imena in simbole za veličine in njihove enote.
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2019
Nadomešča:
SIST EN 60027-2:2008
Črkovni simboli za uporabo v elektrotehniki - 2. del: Telekomunikacije in
elektronika (IEC 60027-2:2019)
Letter symbols to be used in electrical technology - Part 2: Telecommunications and
electronics (IEC 60027-2:2019)
Formelzeichen für die Elektrotechnik - Teil 2: Telekommunikation und Elektronik (IEC
60027-2:2019)
Symboles littéraux à utiliser en électrotechnique - Partie 2: Télécommunications et
électronique (IEC 60027-2:2019)
Ta slovenski standard je istoveten z: EN IEC 60027-2:2019
ICS:
01.075 Simboli za znake Character symbols
31.020 Elektronske komponente na Electronic components in
splošno general
33.020 Telekomunikacije na splošno Telecommunications in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 60027-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2019
ICS 01.060, 33.020 Supersedes EN 60027-2:2007
English Version
Letter symbols to be used in electrical technology - Part 2:
Telecommunications and electronics
(IEC 60027-2:2019)
Symboles littéraux à utiliser en électrotechnique - Partie 2: Formelzeichen für die Elektrotechnik - Teil 2:
Télécommunications et électronique Telekommunikation und Elektronik
(IEC 60027-2:2019) (IEC 60027-2:2019)
This European Standard was approved by CENELEC on 2019-02-12. 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
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60027-2:2019 E
European foreword
The text of document 25/635/FDIS, future edition 4 of IEC 60027-2, prepared by IEC/TC 25
"Quantities and units" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC
as EN IEC 60027-2:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2019-11-12
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-02-12
document have to be withdrawn
This document supersedes EN 60027-2:2007.
This edition constitutes a technical revision and includes the following significant changes with respect
to the previous edition:
a) former Subclauses 3.8 and 3.9 are cancelled and replaced by EN 80000-13:2008;
b) former Subclause 3.10, now 4.8, is revised in accordance with IEC 60050-192:2015;
c) former Subclause 3.11, now 4.9, is revised in accordance with IEC 60050-561:2014;
d) former Subclause 3.13, now 4.11, is revised in accordance with EN ISO 80000-8:2007,
IEC 60050-801:1994 and IEC 60050-802:2011;
e) technical and editorial corrections have been carried out, mainly in Subclause 4.1.
f) tables are simplified, mainly by deleting useless columns.
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 60027-2:2019 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 60027-3 NOTE Harmonized as EN 60027-3
IEC 60747 (series) NOTE Harmonized in EN 60747 (series)
IEC 61703:2001 NOTE Harmonized as EN 61703:2002 (not modified)
ISO 80000-1:2009 NOTE Harmonized as EN ISO 80000-1:2013 (not modified)
ISO 80000-8:2007 NOTE Harmonized as EN ISO 80000-8:2007 (not modified)
IEC 80000-13:2008 NOTE Harmonized as EN 80000-13:2008 (not modified)
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 60027-1 1992 Letters symbols to be used in electrical
technology - Part 1: General
+ A1 1997 EN 60027-1 2006
+ A2 2005 + A2 2007
IEC 60027-2 ®
Edition 4.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Letter symbols to be used in electrical technology –
Part 2: Telecommunications and electronics
Symboles littéraux à utiliser en électrotechnique –
Partie 2: Télécommunications et électronique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 01.060; 33.020 ISBN 978-2-8322-6346-4
– 2 – IEC 60027-2:2019 © IEC 2019
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Introduction to tables . 5
5 Quantities and units . 6
5.1 General concepts . 6
5.2 Linear time-independent networks under sinusoidal conditions . 20
5.2.1 General . 20
5.2.2 Two-port networks . 20
5.2.3 n-port networks . 28
5.3 Line transmission of signals and telephony . 34
5.3.1 Quantities and units in line transmission . 34
5.3.2 Subscripts for line transmission . 35
5.3.3 Quantities and units in telephony . 36
5.3.4 Subscripts for telephony . 36
5.4 Waveguide propagation . 37
5.4.1 Frequency and wavelength in a waveguide . 37
5.4.2 Characteristic and normalized impedance and admittance in general. 38
5.4.3 Impedance and admittance at a point in a substance . 39
5.4.4 Impedance and admittance at a point in vacuum . 40
5.4.5 Impedance and admittance of a waveguide . 41
5.5 Radiocommunications . 42
5.5.1 General and tropospheric propagation . 42
5.5.2 Ionospheric propagation . 45
5.5.3 Antennas . 46
5.5.4 Radio links. 51
5.6 Optical fibre communication . 53
5.7 Television . 59
5.8 Dependability . 61
5.9 Piezoelectric resonators . 62
5.10 Semiconductor devices . 68
5.11 Electroacoustics . 68
Bibliography . 73
Figure 1 – Conventions concerning signs in electric circuits . 20
Figure 2 – Conventions for n-port linear networks . 28
Figure 3 – Equivalent circuits of a one-port piezoelectric resonator . 62
IEC 60027-2:2019 © IEC 2019 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY –
Part 2: Telecommunications and electronics
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.
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