EN 60027-2:2007

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

Définit les règles pour l'utilisation des symboles littéraux dans le domaine des télécommunications et l'électronique.

Črkovni simboli za uporabo v elektrotehnologiji - 2. del: Telekomunikacije in elektronika (IEC 60027-2:2005)

General Information

• Status: Withdrawn
• Publication Date: 24-Apr-2007
• Withdrawal Date: 31-Mar-2010
• ICS: 01.060 - Quantities and units
• Technical Committee: CLC/SR 25 - Quantities and units, and their letter symbols
• Drafting Committee: IEC/TC 25 - IEC_TC_25
• Parallel Committee: IEC/TC 25 - IEC_TC_25
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 12-Feb-2022
• Completion Date: 12-Feb-2022
• Ref Project: SIST EN 60027-2:2008 - Letter symbols to be used in electrical technology -- Part 2: Telecommunications and electronics

Relations

• Replaces: HD 60027-2:2003 - Letter symbols to be used in electrical technology - Part 2: Telecommunications and electronics
• Effective Date: 28-Jan-2023
• Replaced By: EN 80000-13:2008 - Quantities and units - Part 13: Information science and technology
• Effective Date: 28-Jan-2023
• Replaced By: EN IEC 60027-2:2019 - Letter symbols to be used in electrical technology - Part 2: Telecommunications and electronics
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2008
1DGRPHãþD
SIST HD 60027-2:2004
ýUNRYQLVLPEROL]DXSRUDERYHOHNWURWHKQRORJLMLGHO7HOHNRPXQLNDFLMHLQ
HOHNWURQLND,(&
Letter symbols to be used in electrical technology -- Part 2: Telecommunications and
electronics
Formelzeichen für die Elektrotechnik - Teil 2: Telekommunikation und Elektronik
Symboles littéraux à utiliser en électrotechnique -- Partie 2: Télécommunications et
électronique
Ta slovenski standard je istoveten z: EN 60027-2:2007
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 60027-2
NORME EUROPÉENNE
April 2007
EUROPÄISCHE NORM
ICS 01.060 Supersedes HD 60027-2:2003

English version
Letter symbols to be used in electrical technology -
Part 2: Telecommunications and electronics
(IEC 60027-2:2005)
Symboles littéraux à utiliser  Formelzeichen
en électrotechnique - für die Elektrotechnik -
Partie 2: Télécommunications Teil 2: Telekommunikation
et électronique und Elektronik
(IEC 60027-2:2005)
(CEI 60027-2:2005)
This European Standard was approved by CENELEC on 2007-04-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60027-2:2007 E
Foreword
The text of the International Standard IEC 60027-2:2005, prepared by IEC TC 25, Quantities and units,
and their letter symbols, was submitted to the Unique Acceptance Procedure and was approved by
CENELEC as EN 60027-2 on 2007-04-01 without any modification.
This European Standard supersedes HD 60027-2:2003.
– it contains a revision of some clauses of HD 245.2 S1:1983 that were not technically revised in
HD 60027-2:2003;
– it contains a revision of Clause 8 which is now Clause 10;
– it contains some new clauses dealing with subjects that were not previously considered;
– former Clause 10 will be given in another part of EN 60027;
– former Clause 11 will be revised as EN 60027-6.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2008-04-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-04-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60027-2:2005 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 60027-2:2007
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

1)
IEC 60027-1 1992 Letter symbols to be used in electrical EN 60027-1 2006
technology -
Part 1: General
IEC 60027-3 2002 Letter symbols to be used in electrical EN 60027-3 2007
technology -
Part 3: Logarithmic and related quantities,
and their units
IEC 60050-101 1998 International Electrotechnical Vocabulary - -
(IEV) -
Part 101: Mathematics
IEC 60050-131 2002 International Electrotechnical Vocabulary - - -
Part 131: Circuit theory
IEC 60050-191 1990 International Electrotechnical Vocabulary - -
(IEV) -
Chapter 191: Dependability and quality of
service
IEC 60050-351 1998 International Electrotechnical Vocabulary - -
(IEV) -
Part 351: Automatic control
IEC 60050-702 1992 International electrotechnical vocabulary - -
(IEV) -
Chapter 702: Oscillations, signals and related
devices
IEC 60050-704 1993 International electrotechnical vocabulary - -
(IEV) -
Chapter 704: Transmission
IEC 60050-705 1995 International Electrotechnical Vocabulary - -
(IEV) -
Chapter 705: Radio wave propagation

IEC 60050-712 1992 International Electrotechnical Vocabulary - -
(IEV) -
Chapter 712: Antennas
1)
EN 60027-1 is based on IEC 60027-1:1995 (Reprint) + A1:1997.

Publication Year Title EN/HD Year
IEC 60050-713 1998 International Electrotechnical Vocabulary - -
(IEV) -
Part 713: Radiocommunications: transmitters,
receivers, networks and operation

IEC 60050-715 1996 International Electrotechnical Vocabulary - -
(IEV) -
Chapter 715: Telecommunication networks,
teletraffic and operation
IEC 60050-721 1991 International Electrotechnical Vocabulary - -
(IEV) -
Chapter 721: Telegraphy facsimile and data
communication
IEC 60050-722 1992 International electrotechnical vocabulary - -
(IEV) -
Chapter 722: Telephony
IEC 60050-723 1997 International Electrotechnical Vocabulary - -
(IEV) -
Chapter 723: Broadcasting: Sound, television
and data
IEC 60050-725 1994 International Electrotechnical Vocabulary - -
(IEV) -
Chapter 725: Space radiocommunications

IEC 60050-726 1982 International electrotechnical vocabulary - -
(IEV) -
Part 726: Transmission lines and waveguides

IEC 60050-731 1991 International Electrotechnical Vocabulary - -
(IEV) -
Chapter 731: Optical fibre communication

IEC 60122-1 2002 Quartz crystal units of assessed quality - EN 60122-1 2002
Part 1: Generic specification
IEC 60375 2003 Conventions concerning electric and EN 60375 2003
magnetic circuits
IEC 60747 Series Semiconductor devices - -

IEC 60747-1 1983 Semiconductor devices - - -
Part 1: General
IEC 60748 Series Semiconductor devices - - -
Integrated circuits
IEC 60748-1 2002 Semiconductor devices - Integrated circuits - - -
Part 1:General
IEC 61703 2001 Mathematical expressions for reliability, EN 61703 2002
availability, maintainability and maintenance
support terms
IEC/TR 61931 1998 Fibre optic - Terminology - -

ISO/IEC 2382-16 1996 Information technology - Vocabulary - - -
Part 16: Information theory
- 5 - EN 60027-2:2007
Publication Year Title EN/HD Year
ISO 31-0 1992 Quantities and units - - -
Part 0: General principles
ISO 31-11 1992 Quantities and units - - -
Part 11: Mathematical signs and symbols for
use in the physical sciences and technology

NORME CEI
INTERNATIONALE
IEC
60027-2
INTERNATIONAL
Troisième édition
STANDARD
Third edition
2005-08
Symboles littéraux à utiliser en électrotechnique –
Partie 2:
Télécommunications et électronique

Letter symbols to be used in electrical
technology –
Part 2:
Telecommunications and electronics

 IEC 2005 Droits de reproduction réservés  Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
CODE PRIX
XB
PRICE CODE
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

60027-2  IEC:2005 – 3 –
CONTENTS
FOREWORD.5

1 Scope.9
2 Normative references .9
3 General concepts .13
3.1 General .13
3.2 Linear networks.35
3.2.1 General .35
3.2.2 Two-port linear networks under sinusoidal conditions .35
3.2.3 n-port linear networks under sinusoidal conditions .53
3.3 Line transmission of signals and telephony.65
3.3.1 General .65
3.3.2 Line transmission .65
3.3.3 Subscripts for line transmission .67
3.3.4 Telephony .69
3.3.5 Subscripts for telephony .71
3.4 Waveguide propagation.73
3.4.1 Frequency and wavelength in a waveguide.73
3.4.2 Characteristic and normalized impedance and admittance in general
(unbounded space, waveguide or transmission line) .73
3.4.3 Impedance and admittance at a point in a substance.75
3.4.4 Impedance and admittance at a point in vacuum .75
3.4.5 Impedance and admittance of a waveguide .77
3.5 Radiocommunications .79
3.5.1 General .79
3.5.2 General and tropospheric propagation .79
3.5.3 Ionospheric propagation .83
3.5.4 Antennas .85
3.5.5 Radio links .93
3.6 Optical fibre communication .97
3.7 Television.107
3.8 Data processing and data transmission .111
3.8.1 Teletraffic .111
3.8.2 Data processing and digital transmission.113
3.8.3 Prefixes for binary multiples .121
3.9 Information theory .123
3.10 Dependability .129
3.11 Equivalent circuits of piezoelectric crystal units .133
3.12 Semiconductor devices .141
3.13 Electroacoustics .141

60027-2  IEC:2005 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY –

Part 2: Telecommunications and electronics

FOREWORD
1) The International El
...