CISPR TR 16-3:2010/AMD1:2012

CISPR/TR 16-3 ®
Edition 3.0 2012-07
TECHNICAL
REPORT
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE

AMENDMENT 1
Specification for radio disturbance and immunity measuring apparatus and
methods –
Part 3: CISPR technical reports

CISPR/TR 16-3:2010/A1:2012(E)
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CISPR/TR 16-3 ®
Edition 3.0 2012-07
TECHNICAL
REPORT
INTERNATIONAL SPECIAL COMMITTEE ON RADIO INTERFERENCE

AMENDMENT 1
Specification for radio disturbance and immunity measuring apparatus and

methods –
Part 3: CISPR technical reports

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
E
ICS 33.100.10, 33.100.20 ISBN 978-2-83220-226-5

– 2 – TR CISPR 16-3 Amend. 1 © IEC:2012(E)
FOREWORD
This amendment has been prepared by subcommittee A: Radio-interference measurements
and statistical methods, of IEC technical committee CISPR: International special committee
on radio interference.
The text of this amendment is based on the following documents:
DTR Report on voting
CISPR/A/975/DTR CISPR/A/996/RVC

Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• transformed into an International standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
_____________
3.2 Abbreviations
Add the following new abbreviation to the existing list:
LCL Longitudinal conversion loss

Add, after the existing Subclause 4.10, the following new Subclause 4.11:
4.11 Parameters of signals at telecommunication ports
4.11.1 General
The maximum signal levels that can be present at telecommunication ports in differential
mode are dependent upon, and are limited by, the electrical balance or LCL [85], [86], of the
telecommunication ports and the cables or networks to which they are intended to be
connected, if the wanted signals are not to appear as unacceptable disturbances across the
common mode impedance to ground.
The LCL of a signal port, cable or network causes a portion of any differential mode signals
on that port, cable or network to be converted to common mode disturbances, for which a
product standard has defined limits [87], [88], [89]. Common mode disturbances (also called
antenna mode disturbances, because they are a source of radiated disturbances to the
environment) should be limited if interference with the reception of radio signals of all kinds is
to be minimized. Common mode disturbances created at a nominally balanced signal port or
transmission medium, for example a twisted copper pair, should be controlled and limited,
whether or not the port or medium is provided with an overall shield. If a shielded medium is

TR CISPR 16-3 Amend. 1 © IEC:2012(E) – 3 –
used, deficiencies in the shield itself as well as in the shield connectors, leading perhaps to
significant electrical discontinuities, will allow a portion of the common mode disturbances
created within the shield environment to appear outside the shield.
The worst-case values for balance and LCL quoted in many network specifications are based
upon the desired signal transmission and crosstalk performance of the networks, and do not
necessarily have regard for the control of the common mode disturbances considered in the
product standard.
To ensure that the physical layer specifications for telecommunication networks do not
inadvertently lead to the generation of unacceptable electromagnetic disturbances, it is
essential that the EMC implications of the specifications for some critical parameters be
considered early in the development of the network standards.
To achieve EMC of telecommunication networks employing twisted pair media, the most
important parameters to consider are the:
• levels specified for the wanted transverse or differential mode electrical signals;
• spectral characteristics of the line codes
...