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TECHNICAL REPORT
CLC/TR 50450

RAPPORT TECHNIQUE
March 2006
TECHNISCHER BERICHT

ICS 33.040.40; 33.100.01 Supersedes R0BT-003:2000


English version


Resistibility requirements for equipment
having (a) telecommunication port(s)



Exigences de tenue aux chocs  Anforderungen zur Zerstörfestigkeit
des équipements possédant von Einrichtungen mit
un (des) port(s) de télécommunication (einem Telekommunikationsanschluss)
Telekommunikationsanschlüssen







This Technical Report was approved by CENELEC on 2005-12-09.

CENELEC members are the national electrotechnical committees of Austria, Belgium, 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


© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. CLC/TR 50450:2006 E

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CLC/TR 50450:2006 - 2 -
Foreword
CENELEC Report R0BT-003:2000 had been established by a joint ad hoc working group, which was set
up between CENELEC and ETSI in order to analyze the status quo in the field of standardization
concerning resistibility. The group was composed by experts from the following Technical Bodies within
CENELEC and ETSI: CENELEC/SC 210A, CENELEC/TC 215, CENELEC/TC 81X, CENELEC/TC 74 and
ETSI/TC ERM (EMC-WG).
NOTE  CENELEC/TC 74 has been transferred into CENELEC/TC 108 “Safety of electronic equipment within the fields of
audio/video, information technology and communication technology” in 2002. CENELEC/SC 210A has been disbanded in
2003 and its work items were taken over by the parent committee TC 210.
Through BT decision D122/066 R0BT-003:2000 was assigned to TC 215 for re-publication as a CLC/TR. The
technical contents has not been changed, however, editorial improvements have been made to update references
to (draft) standards as well as to reflect changes in Technical (Sub-) Committee structure.
The text of the draft was submitted to the formal vote and was approved by CENELEC as CLC/TR 50450
on 2005-12-09.
____________

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Contents
Introduction.4
1 Scope.4
2 References.4
3 Definitions and abbreviations .4
3.1 Definitions.4
3.2 Abbreviations.5
4 Clarification of the term resistibility .5
5 Recommendations.7
6 Conclusions.7
Annex A (informative) Electromagnetic phenomena with respect to physical ports .8
Annex B (informative) Bibliography .10

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CLC/TR 50450:2006 - 4 -
Introduction
1)
As defined in the CENELEC/ETSI Report R0BT-001/ETR 238:1995 , resistibility of equipment shall be
treated in the context of electromagnetic phenomena. In general resistibility is considered as a quality
issue. Quality aspects are not explicitly addressed by the essential requirements of New Approach
Directives of the European Union. Resistibility should be viewed as a consideration to be taken when
designing a product for its intended installation or environment. Therefore, these aspects should be the
object of specific standards.
1 Scope
This document is intended to act as guidance for technical committees with respect to:
a) producing resistibility standards;
b) identifying the relevant committees for preparing European resistibility standards.
Safety (electrical etc.) and EMC are excluded from the scope of this report.
2 References
This document makes reference to the following documents.
IEC 60050-161, International Electrotechnical Vocabulary – Chapter 161: Electromagnetic compatibility
IEC 60050-701, International Electrotechnical Vocabulary – Chapter 701: Telecommunications, channels
and networks
1)
CENELEC/ETSI R0BT-001/ETR 238 , CENELEC/ETSI standardization programme for the development
of Harmonized Standards related to Electro-Magnetic Compatibility (EMC) in the field of
telecommunications
Directive 89/336/EEC, Council Directive of 3 May 1989 on the approximation of the laws of the Member
States relating to Electromagnetic Compatibility
Directive 99/5/EC, Directive 99/5/EC of the European Parliament and of the Council relating Radio
Equipment and Telecommunications Terminal Equipment and the Mutual Recognition of their Conformity
Directive 98/13/EC, Directive 98/13/EC of the European Parliament and of the Council of 12 February
1998 relating to telecommunications terminal equipment and satellite earth station equipment, including
the mutual recognition of their conformity
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this report the following definitions apply.
3.1.1
immunity (to a disturbance)
the ability of a device, equipment or system to perform without degradation in the presence of an
electromagnetic disturbance
[IEC 60050-161:1990, 161-01-20]
3.1.2
resistibility
the ability of telecommunication equipment or a network to withstand, in general without damage, the effects of
certain electrical, magnetic and electromagnetic phenomena up to a certain, specified extent, and in
accordance with a specified criterion

1)
The future designation of this document is presently being discussed by CLC/TC 210.

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3.1.3
telecommunication
any transmission, emission or reception of signs, signals, writing, images and sounds or intelligence of
any nature by wire, radio, optical or other electromagnetic systems
[IEC 60050-701:1988, 701-01-05]
3.1.4
telecommunication network
a transmission medium intended for communication between equipments that may be located in separate
buildings.
NOTE 1  The term telecommunication network is defined in terms of its functionality, not its electrical
characteristics.
NOTE 2  A telecommunication network may be
- publicly or privately owned;
- subject to transient overvoltages due to atmospheric discharges and faults in power distribution
systems;
- subject to permanent longitudinal (common mode) voltages induced from nearby power lines or
electric traction lines.
NOTE 3  Examples of telecommunication networks are:
- a public switched telephone network;
- a public data network;
- an ISDN network;
- a private network with electrical interface characteristics similar to the above.
3.1.5
telecommunication port
port which is intended to be connected to telecommunication networks, Local Area Networks (e.g.
Ethernet, Token Ring) and similar networks, either through physical connection (cable optical fibre) or
radio connection
NOTE  In the latter case the antenna port is the telecommunication port.
3.2 Abbreviations
EMC Electromagnetic compatibility
ESD Electrostatic discharge
LEMP Lightning electromagnetic pulse
HEMP High altitude electromagnetic pulse
RF Radio frequency
TTE Telecommunication terminal equipment
PSTTN Public Switching and Transmission Telecommunication Network
4 Clarification of the term resistibility
This report considers resistibility (i.e. ability to withstand specified levels of electrical stress without being
damaged in general) addressed to the needs of the whole of the telecommunication network, i.e. all
types of networks, public and private, as well as any equipment installed in or connected to this network.
The resistibility requirements are based on the following electromagnetic phenomena: lightning, power
induction, earth potential rise, low-voltage power contact and electrostatic discharge.
It should be noted that the EMC Directive 89/336/EEC (and its successor, Directive 2004/108/EC, which
will come into force in January 2007) does not contain resistibility requirements (but immunity and
emission requirements). Therefore, resistibility should not be subject to regulation under the EMC
Directive 89/336/EEC, the Codified Terminal Directive 98/13/EC or the Radio Equipment and
Telecommunications Terminal Equipment (R&TTE) Directive 99/5/EC.
This clause provides for general clarification of the term "resistibility" of telecommunication equipment
working within networks.

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CLC/TR 50450:2006 - 6 -
The term resistibility has both electrical aspects and economic implications:
a) Electrical aspects:
Resistibility is, like EMC, related to electromagnetic phenomena. It is essential not to mix up the
resistibility of a product with its electrical safety (covered for instance by series EN 60950).
Some electromagnetic phenomena (e.g. ESD, surge) may have both immunity and resistibility
aspects. The difference between immunity and resistibility is on the “performance criterion”:
resistibility allows for a loss of function without damages (damages are allowed only on the power
contact test). Resistibility deals with damage and not with normal operation. Therefore the resistibility
test levels for an electromagnetic phenomenon are in general different from the immunity test levels.
b) Economic implications:
The resistibility requirement of telecommunication equipment and systems also depend on economic
aspects such as:
1) risk assessment (high repair costs of low protected equipment versus no repair costs of highly
protected equipment, probability of occurrence of damaging electromagnetic phenomena);
2) intended application;
3) the mitigation methods in installations;
4) continuity of the service;
5) serviceability of the equipment (equipment installed in difficult to reach places, e.g. high
mountains).
Due to these aspects it can be useful that the European resistibility standards recommend only one level
of resistibility, whereas higher levels could be selected on the basis of aspects listed above by the
manufacturer or the user of the equipment.
It is considered that resistibility standards have to be used in engineering practice together with
standards offering system approaches, mitigation methods etc., in a consistent manner.
Table 1 summarizes, how resistibility and mitigation methods can be managed with such a system
approach.
In general, two different types of electromagnetic environments can be identified, which obviously require
different measures depending on the kind and/or complexity of the telecom
...