NORME INTERNATIONALE
INTERNATIONAL STANDARD
Symboleslitterauxautiliserenelectrotechnique-
Telemunicationsetelectronique Partie2:
technology- Lettersymbolstobeusedinelectrical
Part 2:Telemunicationsandelectronics
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CONTENTS
FOREWORD.
A Scope. .92 Normative references General concepts ..13 .93 3.1 General. 133.2 Linear networks. 353.2.1 3.2.2 Two-port linear networks under sinusoidal conditions General 35 353.2.3 n-port linear networks under sinusoidal conditions. .533.3 Line transmission of signals and telephon... 653.3.1 3.3.2 Line transmission General. ..65 .653.3.3 Subscripts for line transmission . 673.3.4 Telephony .693.4 Waveguide propagation.. 3.3.5 Subscripts for telephony. .73 .713.4.1 Frequency and wavelength in a waveguide. .733.4.2 Characteristic and normalized impedance and admittance in general (unbounded space waveguide or transmission line) .3.4.3 Impedance and admittance at a point in a substance. .753.4.4 3.4.5 Impedance and admittance at a point in vacuum Impedance and admittance of a waveguide ...77 .753.5 Radiomunications .793.5.1 General. 793.5.2 3.5.3 General and tropospheric propagation. lonospheric propagation. .79 .833.5.4 Antennas. .853.5.5 Radio links .933.6 3.7 Optical fibre munication. Television. 107 ..973.8 Data processing and data transmission 1113.8.1 Data processing and digital transmission. Teletraffic 111 1133.8.2 3.8.3 Prefixes for binary multiples 1213.9 Information theory 1233.10 Dependability 3.11 Equivalent circuits of piezoelectric crystal units 1293.12 Semiconductor devices 1413.13 Electroacoustics 141
LETTERSYMBOLSTOBEUSEDINELECTRICALTECHNOLOGY-
Part2:Telemunicationsandelectronics
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization prising all national electrotechnical mittees (IEC National Committees). The object of IEC is to promoteinternational 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 Repors. Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IECin the subject dealt with may participate in this preparatory work. International govermmental and non- govermmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closelywith the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.consensus of opinion on the relevant subjects since each technical mittee has representation from all3) IEC Publications have the form of remendations for international use and are accepted by IEC National interested IEC National Committees.Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC4) In order to promote intermational uniformity IEC National Committes undertake to apply IEC Publications misinterpretation by any end user.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 in5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any the latter.equipment declared to be in conformity with an IEC Publication.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 andmembers of its technical mittes and IEC National Committes for any personal injury property damage or other damage of any nature whatsoever whether direct or indirect or for costs (including legal fees) andexpenses 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.patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60027-2 has been prepared by IEC technical mittee 25:Quantities and units and their letter symbols.
constitutes a technical revision.
edition: This edition includes the following significant technical changes with respect to the previous
a) it contains a revision of some clauses of the first edition that were not technically revisedin the second edition;c) it contains some new clauses dealing with subjects that were not previously considered; b) it contains a revision of Clause 8 which is now Clause 10;d) former Clause 10 will be given in another part of IEC 60027;e) former Clause 11 will be revised as IEC 60027-6.
The text of this standard is based on the following documents:
FDIS Report on voting25/298/FDIS 25/304/RVD
Full information on the voting for the approval of this standard can be found in the report onvoting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives Part 2.
IEC 60027 consists of the following parts under the general title Letter symbols to be used inelectrical technology:
Part 2:Telemunications and electronics Part 1:GeneralPart 3: Logarithmic and related quantities and their unitsPart 4:Symbols for quantities to be used for rotating electrical machinesPart 6: Control technology
Part 7:Physiological quantities and units
The mittee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under in thedata related to the specific publication. At this date the publication will be
reconfirmed withdrawn replaced by a revised edition oramended.
LETTERSYMBOLSTOBEUSEDINELECTRICALTECHNOLOGY-
Part2:Telemunicationsandelectronics
1Scope
This part of IEC 60027 is applicable to telemunications and electronics. It gives namesand symbols for quantities and units.
2Normativereferences
For dated references only the edition cited applies.For undated references the latest editionof the referenced document (including any amendments) applies.
IEC 60027-1:1992 Letter symbols to be used in electrical technology - Part 1: General
IEC 60027-3:2002 Letter symbols to be used in electrical technology - Part 3: Logarithmicand related quantities
IEC 60050-101:1998 International Electrotechnical Vocabulary - Part 101: Mathematics
IEC 60050-191:1990 International Electrotechnical Vocabulary - Part 191: Dependability and quality of service
IEC 60050-351:1998 International Electrotechnical Vocabulary - Part 351: Automatic control
IEC 60050-702:1992 International Electrotechnical Vocabulary - Part 702:Oscillations signals and related devices
IEC 60050-704:1993 International Electrotechnical Vocabulary - Part 704: Transmission
IEC 60050-705:1995 International Electrotechnical Vocabulary - Part 705: Radio waveuoebedosd
IEC 60050-712:1992 International Electrotechnica/ Vocabulary - Part 712: Antennas
IEC 60050-713:1998 International Electrotechnical Vocabulary -Part 713:Radiomuni-cations: transmitters receivers networks and operation
IEC 60050-715:1996 Telemunication networks teletraffic and operation
IEC 60050-721:1991.International Electrotechnical Vocabulary -Part 721:Telegraphy facsimile and data munication
IEC 60050-722:1992 International Electrotechnical Vocabulary - Part 722: Telephony
IEC 60050-723:1997 International Electrotechnical Vocabulary - Part 723:Broadcasting:sound television data
