SIST ETS 300 386-1:1999

SLOVENSKI STANDARD
01-november-1999
Inženiring opreme (EE) - Oprema za telekomunikacijska omrežja - Zahteve za
elektromagnetno združljivost (EMC) - 1. del: Pregled družine izdelkov, kriteriji
ustreznosti in preskuševalni nivoji
Equipment Engineering (EE); Telecommunication network equipment; Electro-Magnetic
Compatibility (EMC) requirements; Part 1: Product family overview, compliance criteria
and test levels
Ta slovenski standard je istoveten z: ETS 300 386-1 Edition 1
ICS:
33.050.01 Telekomunikacijska Telecommunication terminal
terminalska oprema na equipment in general
splošno
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 386-1
TELECOMMUNICATION December 1994
STANDARD
Source: ETSI TC-EE Reference: DE/EE-04003-1
ICS: 33.080
EMC, network, PTN
Key words:
Equipment Engineering (EE);
Public telecommunication network equipment
Electro-Magnetic Compatibility (EMC) requirements
Part 1: Product family overview, compliance criteria
and test levels
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1994. All rights reserved.
New presentation - see History box

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ETS 300 386-1: December 1994
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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ETS 300 386-1: December 1994
Contents
Foreword .5
Introduction.6
1 Scope .9
2 Normative references.9
3 Definitions and abbreviations .11
3.1 Definitions .11
3.2 Abbreviations .13
4 General operational conditions.13
4.1 Equipment configuration .13
4.2 Exercising equipment .13
4.3 Laboratory environment.14
5 General compliance criteria for immunity tests .14
5.1 Normal Performance (NP) .14
5.2 Reduced Performance (RP) .14
5.3 Loss of Function (Self recovery) (LFS) .15
5.4 Loss of Function (Customer reset) (LFC).15
5.5 Loss of Function (Operator reset) (LFO) .15
6 Immunity: test methods .15
6.1 General .15
6.2 Electrostatic discharge.15
6.3 Electrical fast transients/burst.15
6.4 Surges.15
6.4.1 Outdoor signal line ports .15
6.4.2 Indoor signal line ports .16
6.4.3 AC power line ports .16
6.5 Immunity to continuous conducted signals .16
6.5.1 Low frequency (≤ 150 kHz) .16
6.5.1.1 AC power supply port .16
6.5.1.2 DC power supply interface port .16
6.5.1.3 Signal line port .16
6.5.2 Radio frequency (> 150 kHz).17
6.5.2.1 AC power supply port .17
6.5.2.2 DC power supply interface port .17
6.5.2.3 Signal line port .17
6.6 Immunity to radiated electromagnetic fields .17
6.7 Immunity to power supply disturbances: AC and DC ports.17
6.7.1 Test of immunity to low frequency disturbances: AC ports .17
6.7.2 Test of immunity to low frequency disturbances: DC ports .17
7 Emission: test methods and limits.18
7.1 General .18
7.2 Conducted emission .18
7.2.1 Signal line ports: test method and limits.18
7.2.2 Mains interface: test method and limits.18
7.2.3 DC power interfaces: test methods and limits.18
7.3 Radiated emission: test method and limits .19
8 Requirements.19

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ETS 300 386-1: December 1994
Annex A (normative): Surges: test method for ports of signal lines remaining within the building . 25
A.1 Test set-up for ports with ISDN interface. 25
Annex B (informative): Classification of the electromagnetic environmental conditions . 27
B.1 Introduction. 27
B.2 Application area . 27
B.3 Characteristics of environments . 27
B.3.1 Telecommunication centres (common features class 1 and class 2) . 27
B.3.1.1 Class 1 - major telecommunication centres . 28
B.3.1.2 Class 2 - minor telecommunication centres . 28
B.3.2 Class 3 - outdoor locations.28
B.3.3 Class 4 - customers' premises. 29
B.4 Attributes of customers' premises . 30
B.5 Notation to tables B.2 to B.7 . 30
B.6 Characteristic severities of the environmental parameters . 31
Annex C (informative): Evaluation of test results. 37
Annex D (informative): Guidance for the preparation of product specific operational conditions and
compliance criteria. 39
D.1 General. 39
D.2 Operational conditions and compliance criteria during EMC tests . 39
D.2.1 General considerations .39
D.2.2 Operational conditions during EMC tests. 40
D.2.3 Compliance criteria during EMC tests. 40
Annex E (informative): Bibliography . 42
History. 43

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ETS 300 386-1: December 1994
Foreword
This European Telecommunication Standard (ETS) has been produced by the Equipment Engineering
(EE) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS is Part 1 of a 2 part ETS. Part 2 of this ETS is currently being drafted and is further divided into 5
parts as follows:
Part 1: "Product family overview, compliance criteria and test levels".
Part 2-1: "Product specific compliance criteria and operating conditions - Switching equipment"
(DE/EE-04003-2-1).
Part 2-2: "Product specific compliance criteria and operating conditions - Transmission equipment"
(DE/EE-04003-2-2).
Part 2-3: "Product specific compliance criteria and operating conditions - Power supply equipment"
(DE/EE-04003-2-3).
Part 2-4: "Product specific compliance criteria and operating conditions - Supervisory equipment"
(DE/EE-04003-2-4).
Part 2-5: "Product specific compliance criteria and operating conditions - Tariff and billing equipment"
(DE/EE-04003-2-5).
Transposition dates
Date of latest announcement of this ETS (doa): 31 March 1995
Date of latest publication of new National Standard 30 September 1995
or endorsement of this ETS (dop/e):
Date of withdrawal of any conflicting National Standard (dow): 30 September 1995

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ETS 300 386-1: December 1994
Introduction
The purpose of testing is to ascertain whether the equipment will perform satisfactorily in its
electromagnetic environment. Hence, testing requirements need to relate to actual electromagnetic
environmental conditions. The statistical nature of the environment as well as the equipment's response to
stress needs to be taken into account.
This is done by introducing the concepts of "environmental classes", "priorities of service", and graded
"compliance criteria" described in more detail below.
Part 1 of this ETS specifies all parameters that are not specific to a particular equipment. These are:
- general operating conditions;
- test levels for immunity (tables 2, 3, 4 and 5) and associated general compliance criteria. Test
levels are specified according to environmental class and according to priority of service;
- emission limits related to an environmental class.
Dedicated product-specific EMC requirements are being developed in the planned part 2 of this ETS
(i.e. parts 2-1 to 2-5).
Environmental classes
The electromagnetic environment varies from time to time and from place to place in a very complicated
manner. The concept of environmental classes introduced by the IEC, (IEC Publication No. 721 [2]) and
also implemented by ETSI, (ETS 300 019 [11]) for climatic and mechanical environments takes these
aspects into account.
An environmental class is an envelope of the environments encountered in a group of locations with
similar properties. This ETS defines environmental classes for public telecommunication equipment:
- telecommunication centres, classes 1 and 2;
- locations other than telecommunication centres, classes 3 and 4.
The characteristics of the environmental classes are given in annex B.
Determination of limits
Immunity limits have been set considering that:
- the purpose of testing is to reveal potential failure mechanisms by means of well-defined exposures
under controlled laboratory conditions;
- the test does not attempt to reproduce the exposures experienced in practice, but to reproduce the
effects of real life exposure;
- the test needs to be conclusive even though it is normally based on only a few samples;
- there is a finite probability that equipment in practice will experience more severe stresses than
those considered as being characteristic of the environmental class; it would mean over
specification if 100 % performance was required in all cases;
- a safety margin between full performance and loss of function can be established.

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ETS 300 386-1: December 1994
A graded test is introduced which operates with three levels of performance. In order of increasing
exposure, these levels are designated:
- normal performance (within specified limits);
- reduced performance;
- loss of function.
Each level of performance corresponds to a certain accepted degradation, i.e. an immunity threshold.
The compliance criteria are precisely defined in each individual equipment specification (being developed
in part 2 of this ETS).
Finally, considering that all kinds of equipment are not equally important, it is recommended that the
equipment is rated and tested according to the priority of the service performed, i.e. according to its main
purpose.
The priority of service may be assessed by evaluating the consequences of:
- loss of service;
- loss of equipment;
- loss of revenue;
- loss of reputation.
Two equipment categories and associated EMC requirements are introduced which, in order of increasing
requirements, are designated:
- normal priority of service (see tables 2 and 4);
- high priority of service (see tables 3 and 5).
Which requirements apply to a specific piece of equipment are defined in part 2 of this ETS (under
development).
Emission limits are set considering that:
- emissions should not disturb the normal performance of co-located electronic equipment for
communications or other purposes;
- emissions shall not interfere with the licensed use of the radio spectrum.

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ETS 300 386-1: December 1994
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ETS 300 386-1: December 1994
1 Scope
This European Telecommunication Standard (ETS) specifies the essential Electro-Magnetic Compatibility
(EMC) requirements for non-radio equipment used within the public telecommunications network. It
covers both the emission and immunity requirements of the equipment.
This ETS is applicable to all equipment types, examples of which are listed below. The test methods to be
used are also described together with the failure criteria:
- switching equipment which includes trunk and local telephone exchanges, remote switching
concentrators, international switches, telex switches and network packet switches;
- transmission equipment which includes multiplexers, line equipment and repeaters, Synchronous
Digital Hierarchy (SDH), Digital Cross Connect (DXC), Asynchronous Transfer Mode (ATM) and
network terminations;
- power supply equipment which includes central power plant, end of suite power supplies, power
management systems and other dedicated telecommunications network power supplies;
- supervisory equipment and dedicated Operation And Maintenance (OAM) equipment;
- tariff and billing equipment.
2 Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
[1] EN 55022: "Limits and methods of measurement of radio interference
characteristics of information technology equipment".
[2] IEC Publication No. 721 (Series): "Classification of environmental conditions".
[3] EN 60801-2: "Electromagnetic compatibility of industrial-process measurement
and control equipment; Part 2: Electrostatic discharge requirements".
[4] ENV 50140: "Electromagnetic compatibility - Basic Immunity standard;
Radiated, radio-frequency electromagnetic field - Immunity test".
[5] IEC 801-4 (1988): "Electromagnetic compatibility for industrial-process
measurement and control equipment; Part 4: Electrical fast transient/burst
requirements".
[6] ENV 50142: "Electromagnetic compatibility - Basic immunity standard; Surge
immunity test".
[7] ENV 50141: "Electromagnetic compatibility - Basic immunity standard;
Conducted disturbances induced by radio-frequency fields; Immunity test".
[8] CCITT Recommendation K.20 (1991): "Resistibility of telecommunication
switching equipment to overvoltages and overcurrents".
[9] CCITT Recommendation K.21 (1988): "Resistibility of subscribers' terminals to
overvoltages and overcurrents".
[10] CCITT Recommendation K.22 (1988): "Overvoltage Resistibility of Equipment
connected to an ISDN T/S bus".

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ETS 300 386-1: December 1994
[11] ETS 300 019: "Equipment Engineering (EE); Environmental conditions and
environmental tests for telecommunications equipment".
[12] ETS 300 127: "Equipment Engineering (EE); Radiated emission testing of
physically large telecommunication systems".
[13] ETS 300 132: "Equipment Engineering (EE); Power supply interface at the input
to telecommunications equipment"; Part 1 - Interface operated by alternating
current (AC) Part 2 - Interface operated by direct current (DC).
[14] CISPR Publication No. 16 : "Specifications for radio interference measuring
apparatus and measurements methods".
[15] ENV 55102-1: "Electromagnetic Compatibility requirements for ISDN Terminal
Equipment - Part 1: Emission requirements".
[16] ETS 300 046-1 (1992): "Integrated Services Digital Network (ISDN) primary rate
access; Safety and protection; Part 1: general".
[17] EN 61000-4-11: "Electromagnetic compatibility (EMC), Part 4 Testing and
measurement techniques, Section 11: Voltage dips and short interruptions and
voltage variations".
[18] EN 60555-2: "Disturbances in supply systems caused by household appliances
and similar electrical equipment; Part 2: Harmonics".
[19] EN 60555-3: "Disturbances in supply systems caused by household appliances
and similar electrical equipment; Part 3: Voltage fluctuations".
[20] IEC Publication No. 50 (161): "International Electrotechnical Vocabulary;
Chapter 161: Electromagnetic compatibility".

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ETS 300 386-1: December 1994
3 Definitions and abbreviations
3.1 Definitions
For the purpose of this ETS, the definitions in IEC Publication No. 50 (161) [20] apply. In addition, the
following definitions apply:
priority of service: Measures on a relative scale how important it is that the equipment operates as
specified.
Two levels of priority are standardized: They are designated as normal and high.
Normal priority of service should be assumed unless special circumstances are indicated.
The priority is normal if the equipment has moderate failure consequences. An equipment has
moderate failure consequences when:
- a failure causes limited inconvenience;
- repairs may be made without compromising the responsibilities of the network operator.
The priority is high if the equipment has severe failure consequences. An equipment has severe failure
consequences when:
- failure compromizes the function of vital, centralized systems, or services of commercially sensitive
or security related nature;
- repair or restoration costs are high, or the time the equipment is out of service is unacceptably long;
- corruption of charging or billing information occurs.
The following definitions apply only in the context of this ETS, except where the reference to the IEC
Publication No. 50 (161) [20] is given adjacent to the subclause title, in parentheses:
Audio (low) Frequency (AF): The frequency interval from 0 Hz to 20 kHz. It may sometimes be
convenient to extend the use of this term to include the range of frequencies up to 150 kHz.
burst (161-02-07): A sequence of a limited number of distinct pulses or an oscillation of limited duration.
characteristic severity: The characteristic severity for a certain detail parameter in an environmental
class states a severity which has only a low probability (generally less than 1 %) of being exceeded. The
term relates to duration, rate of occurrence or location. It applies to requirements on the environment and
to immunity requirements.
continuous disturbance (161-02-11): Electromagnetic disturbance the effects of which on a particular
device or equipment cannot be resolved into a succession of distinct effects.
Discontinuous interference (161-02-13): Electromagnetic interference occurring during certain time
intervals separated by interference-free intervals.
duration (of a voltage change) (161-08-03): Interval of time for the voltage to increase or decrease from
the initial value to the final value.
duration (of a pulse): The interval of time between the instants at which the instantaneous value of a
pulse reaches 50 % of the pulse magnitude for the first and last time.
environment, environmental conditions: The electromagnetic conditions external to the equipment, to
which it is subjected at a certain time. The environmental conditions comprise a combination of single
environmental parameters and their severities.
environmental class: A representation of the environment on locations with similar properties. They are
specified and standardized to provide an operational frame of reference for:

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ETS 300 386-1: December 1994
- requirements on the environment;
- immunity requirements.
The class is described using an envelope of environmental conditions expressed in terms of a number of
environmental parameters and their characteristic severities or other characteristics. The environmental
parameters specified for the class are limited to those which may affect equipment performance.
environmental parameters: Present one or more properties of the electromagnetic environment.
immunity (to a disturbance) (161-01-20): The ability of a device, equipment or system to perform
without degradation in the presence of an electromagnetic disturbance.
impulsive disturbance (161-02-09): Electromagnetic disturbance which, when incident on a particular
device or equipment, manifests itself as a succession of distinct pulses or transients.
pulse (161-02-02): An abrupt variation of short duration of a physical quantity followed by a rapid return to
the initial value.
Radio Frequencies (RF): The frequency range above 150 kHz.
rise time (of a pulse) (161-02-05): The interval of time between the instants at which the instantaneous
value of a pulse first reaches a specified lower value and then a specified upper value.
NOTE: Unless otherwise specified, the lower and upper values are fixed at 10 % and 90 % of
the pulse magnitude.
shielding effectiveness: For a given external source, the ratio of electric or magnetic field strength at a
point before and after the placement of the shield in question.
surge (voltage) (161-08-11): A transient voltage wave propagating along a line or a circuit and
characterized by a rapid increase followed by a slower decrease of the voltage.
transient (adjective or noun) (161-02-01): Pertaining to or designating a phenomenon or a quantity
which varies between two consecutive steady states during a time interval which is short compared with
the timescale of interest.
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ETS 300 386-1: December 1994
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
AC Alternating Current
ATM Asynchronous Transfer Mode
CRC Cyclic Redundancy Check
DC Direct Current
DXC Digital Cross Connect
EMC Electro-Magnetic Compatibility
ESD Electrostatic Discharge
EUT Equipment Under Test
LFC Loss of Function (Customer reset)
LFO Loss of Function (Operator reset)
LFS Loss of Function (Self recovery)
NP Normal Performance
RF Radio Frequency
RP Reduced Performance
SDH Synchronous Digital Hierarchy
4 General operational conditions
This clause gives the general operational conditions. The product-specific operating conditions will be
specified in part 2 of this ETS (under development).
The general operational conditions shall allow for appropriate measuring of the emission and for testing of
immunity.
The tests described shall be performed with the Equipment Under Test (EUT) powered up, (i.e. connected
to an appropriate power supply), and operating in a manner which is as representative of normal operation
as possible.
Details on the evaluation of test results are given in annex C.
4.1 Equipment configuration
Power and signal distribution, grounding, interconnecting cabling and physical placement of equipment of
a test system shall simulate the typical application and usage in so far as is practicable, and shall be in
accordance with the relevant product specifications of the manufacturer.
The configuration that tends to maximize the EUT's emission or minimize its immunity is not usually
intuitively obvious and in most instances selection will involve some trial and error testing. For example,
interface cables may be moved or equipment re-orientated during initial stages of testing and the effects
on the results observed.
Only configurations within the range of positions likely to occur in normal use need to be considered.
The configuration selected shall be fully detailed and documented in the test report, together with the
justification for selecting that particular configuration.
4.2 Exercising equipment
The exercising equipment and other auxiliary equipment shall be sufficiently decoupled from the EUT so
that the performance of such equipment does not significantly influence the test results.

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4.3 Laboratory environment
For all the tests, the test laboratory environment shall be the one defined in the corresponding basic
standards EN 60801-2 [3], ENV 50140 [4], IEC 801-4 [5], ENV 50142 [6] and ENV 50141 [7].
The electromagnetic environment of the test laboratory shall not influence the results.
The laboratory environment shall not exceed the limits specified by the manufacturer for normal operation
of the EUT.
5 General compliance criteria for immunity tests
In this clause, general compliance criteria are defined and equipment shall meet these criteria when
tested according to the requirements of clause 8.
The detailed product-specific compliance criteria, associated to the respective general compliance criteria
given in subclauses 5.1 to 5.5, will be given in part 2 of this ETS (under development) for each type of
equipment.
Interpretation of compliance
The equipment is deemed to comply with the EMC requirements, if it meets the compliance criteria given
in tables 2 to 5 and the associated product specific criteria, according to part 2 of this ETS (under
development), while:
- it is operated according to the general and product specific operating conditions, given in clause 4
and in part 2 of this ETS (under development);
- the performance items, as given in part 2 of this ETS (under development) being monitored.
5.1 Normal Performance (NP)
For NP:
- the EUT shall withstand the applied test without damage;
- the EUT shall operate correctly within relevant limits, specified by the manufacturer, during and after
the application of the test;
- corruption of any software or data associated with the EUT shall not occur. This includes data
stored in memory or data in process within the EUT;
- the EUT shall withstand the applied test indefinitely.
5.2 Reduced Performance (RP)
For RP:
- the EUT shall withstand the applied test without damage;
- corruption of software or data held in memory shall not occur;
- reduced performance is permitted within specified relaxed limits;
- resumption to normal performance shall occur at the cessation of the test.

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ETS 300 386-1: December 1994
5.3 Loss of Function (Self recovery) (LFS)
For LFS:
- the EUT shall withstand the applied test without damage;
- corruption of software or data held in memory shall not occur;
- temporary loss of function following application of test is permitted;
- self recovery to normal performance shall occur at the cessation of the test.
5.4 Loss of Function (Customer reset) (LFC)
For LFC:
- the EUT shall withstand the applied test without damage;
- corruption of software or data held in memory shall not occur;
- temporary loss of function following application of test is permitted;
- recovery requires simple customer action to restore normal performance. For example, for
switching functions redialling may be required.
NOTE: The "customer" in this context is the subscriber to the service.
5.5 Loss of Function (Operator reset) (LFO)
For LFO:
- the EUT shall withstand the applied test without damage;
- corruption of system operating software is not permitted;
- temporary loss of function following application of test is permitted;
- recovery requires network operator action to restore normal performance.
6 Immunity: test methods
6.1 General
Where reference is made in this ETS to specific "test levels" to be used for the tests, it is implicitly
required that the EUT shall also fulfil the compliance criteria when tested at "test levels" lower than those
specified. This requirement does not apply, however, to tests for immunity to continuous phenomena.
6.2 Electrostatic discharge
The test method and laboratory conditions are described in EN 60801-2 [3].
6.3 Electrical fast transients/burst
The test method to be used is described in IEC 801-4 [5].
6.4 Surges
6.4.1 Outdoor signal line ports
The test method to be used for signal line ports is described in CCITT Recommendations K.20 [8],
K.21 [9] and K.22 [10], respectively.

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ETS 300 386-1: December 1994
The test generator shall be connected via the coupling network to one signal port. This port shall only be
connected to the surge generator. During the test, the EUT and all ports (other than the one connected to
the generator) shall comply with the given compliance criteria. After the surge has been applied the
generator shall be disconnected from the port and the port checked against the compliance criteria. The
compliance criteria shall contain functional aspects. Therefore, the test serves two purposes:
a) the EMC test of the EUT;
b) a test of resistibility of the port to which the generator is connected.
6.4.2 Indoor signal line ports
Ports of signal lines remaining within the building shall not be subjected to the method in subclause 6.4.1.
Annex A specifies an appropriate test method, dedicated to unshielded 4-wire balanced interface types
with phantom DC power feeding and operating at bit rates up to and including 2 Mbit/s.
The test set up for shielded interface cables is specified in ENV 50142 [6].
For ports connected to multi-conductor lines, for which the network according to annex A is not applicable,
the networks according to subclause 6.3.2.2 of ENV 50142 [6] shall be used.
No other types of signal lines which remain within the building shall be tested.
Signal lines, which according to the manufacturer's specification, shall not be longer than 10 m, shall not
be subjected to this test.
6.4.3 AC power line ports
The test method to be used for AC power line ports is described in ENV 50142 [6].
6.5 Immunity to continuous conducted signals
6.5.1 Low frequency (≤ 150 kHz)
6.5.1.1 AC power supply port
No requirements.
6.5.1.2 DC power supply interface port
No requirements.
6.5.1.3 Signal line port
No requirements.
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ETS 300 386-1: December 1994
6.5.2 Radio frequency (> 150 kHz)
6.5.2.1 AC power supply port
The test method to be used is described in ENV 50141 [7].
Power cables, which according to the manufacturer's specification shall not be longer than 3 m, shall not
be subjected to these tests.
6.5.2.2 DC power supply interface port
The test method to be used is described in ENV 50141 [7].
Power cables, which according to the manufacturer's specification shall not be longer than 3 m, shall not
be subjected to these tests.
The coupling/decoupling network type M1 (see ENV 50141 [7]) shall be used when the DC return lead at
the EUT side is to be connected to the equipment protective earth. If the DC return lead is not connected
to the equipment protective earth then the coupling/decoupling network M2 shall be used.
6.5.2.3 Signal line port
The test method to be used is described in ENV 50141 [7].
Signal cables, which according to the manufacturer's specification shall not be longer than 3 m, shall not
be subjected to these tests.
6.6 Immunity to radiated electromagnetic fields
The test method to be used is described in ENV 50140 [4].
6.7 Immunity to power supply disturbances: AC and DC ports
6.7.1 Test of immunity to low frequency disturbances: AC ports
Immunity to low frequency disturbances on the AC line ports, test methods are defined below.
Public telecommunication equipment in telecommunication centres, normal and high priority of
service:
- these phenomena are addressed in ETS 300 132-1 [13].
Public telecommunication equipment, locations other than telecommunication centres, normal
and high priority of service:
- the test method to be used is described in EN 61000-4-11 [17].
6.7.2 Test of immunity to low frequency disturbances: DC ports
Immunity to low frequency disturbances on the DC line ports, test methods are defined below.
Public telecommunication equipment in telecommunication centres, normal and high priority of
service:
- these phenomena are addressed in ETS 300 132-2 [13].

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7 Emission: test methods and limits
7.1 General
This clause specifies requirements for the measurement of emissions from public telecommunications
network equipment.
Where not specified here, the EUT shall be configured, installed, arranged and operated in a manner
consistent with normal operation.
7.2 Conducted emission
7.2.1 Signal line ports: test method and limits
For conducted emission on signal lines in the frequency range 0,15 - 30 MHz, the EUT shall meet the
requirements given in ENV 55102-1 [15].
7.2.2 Mains interface: test method and limits
For conducted emission on mains interface lines in the frequency range 0,15 - 30 MHz, the EUT shall
meet the requirements specified in EN 55022 [1].
Equipment shall meet the emission requirements at low frequencies, according to EN 60555-2 [18] and
EN 60555-3 [19].
NOTE: The scopes of EN 60555-2 [18] and EN 60555-3 [19] do not cover telecommunications
equipment, however, they may be used for the purposes of this ETS.
7.2.3 DC power interfaces: test methods and limits
The measuring methods shall be those specified for the mains interface in EN 55022 [1] but shall be used
in the frequency range 0,02 MHz - 30 MHz.
The EUT shall be connected to the DC power supply through an artificial network to provide a defined
impedance across EUT at the point of measurement and to provide isolation from the noise on the DC
power supply lines.
The artificial networks to be used are the ones described in CISPR Publication No. 16 [14], section 2:
0,02 - 0,15 MHz subclause 8.2.1 (50 Ω // 50 μH + 5 Ω);
0,15 - 30 MHz subclause 8.2.2 (50 Ω // 50 μH).
Figure 1 shows the general form for the measurement of interference voltages between each conductor
and the reference ground plane. The DC return lead at the EUT side shall be connected to the protective
earth if this is required by the equipment installation specification.
The limits for the conducted emission are as given in table 1.
Table 1
Frequency range Limits in dB μV
Average Quasi-peak
detector detector
0,02 - 0,15 MHz - 79
0,15 - 0,5 MHz 66 79
0,50 - 30 MHz 60 73
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ETS 300 386-1: December 1994
When the use of the artificial network is not suitable (e.g. when the artificial mains network with the current
capacity of the EUT is not commercially available) the method described in CISPR Publication No. 16 [14]
for the voltage probe (1 500 Ω) shall be used.
Radio Frequency (RF) noise not produced by the device under test shall be at least 6 dB below the
appropriate test limit level.
NOTE: The limits in the frequency range 0,15 - 30 MHz are Class A limits as specified in
EN 55022 [1].
D
L2 L1
C
p C2
o
C3
w
R2
e
r
EUT
R2
s
C3
u
C2
p
p
l
L1
L2
y
C1 C1
R3
R3
ME
PE
ZO = R1
PE = P rotective E arth
ME = Measuring Earth
MP
R1
MP = Measuring Point
R1
V
A rtificial netw ork
ME
Coaxial cable
CISPR measuring set
Figure 1: Measurement set-up for conducted emission on DC power interface
7.3 Radiated emission: test method and limits
For radiated emission in the frequency range 30 MHz - 1 000 MHz the EUT shall meet the requirements
as specified in EN 55022 [1].
Where the EUT is considered to be physically large, the test methods and requirements prescribed by
ETS 300 127 [12] shall apply.
8 Requirements
Tables 2 to 5 shall be used in the process of selection of appropriate tests to be applied to the EUT.
Table 2 shall be used for equipment which is intended to be installed in telecommunication centres, and
which has a normal priority of service.
Table 3 shall be used for equipment which is intended to be installed in telecommunication centres, and
which has a high priority of service.
Table 4 shall be used for equipment which is intended to be installed in locations other than
telecommunication centres, and which has a normal priority of service.

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ETS 300 386-1: December 1994
Table 5 shall be used for equipment which is intended to be installed in locations other than
telecommunication centres, and which has a high priority of service.
Test levels have been selected from the recommended levels defined in the relevant "basic standards"
(IEC Publications and ENs), and using the environmental conditions as described in annex B.
The test specifications for equipment in telecommunication centres cover environmental classes 1 and 2.
The test specifications for equipment in locations other than telecommunication centres cover
environmental classes 3 and 4.
Test levels have been selected taking into account:
- that different installation sites can have different environmental conditions;
- that environmental characteristic severity levels may be exceeded with a finite probability;
- that the required safety margin shall reflect the "priority of service".
NOTE: In case that a certain equipment type may be installed in several, different
environments, it is recommended that test levels are selected such that the more
severe conditions are covered.
Annex B quantifies environmental levels having in view the characteristics which are relevant from a
testing point of view. The classification provides background information on which the EMC requirements
have been based. It is emphasized that the environmental levels in annex B are not to be confused with
test levels.
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ETS 300 386-1: December 1994
Table 2: Public telecommunications equipment in telecommunication centres, normal priority of
service
COMPLIANCE
PHENOMENON COUPLING REFERENCE TEST LEVEL (note 3) CRITERION
(PORT) (subclause) (subclause)
IMMUNITY
ESD ENCLOSURE 6.2 2 (4 kV Cont) 5.1 (NP)
(transient (4 kV Air)
phenomenon) 6.2 3 (6 kV Cont) 5.3 (LFS) (note 2)
(8 kV Air)
EFT AC POWER 6.3 2 (1 kV) 5.1 (NP)
(transient 6.3 3 (2 kV) 5.3 (LFS)
phenomenon) DC POWER 6.3 1 (500 V) 5.1 (NP)
SIGNAL 6.3 2 (500 V) 5.1 (NP)
6.3 3 (1 kV) 5.3 (LFS)
RADIATED FIELD ENCLOSURE 6.6 2 (3 V/m) 5.1 (NP)
(CONTINUOUS) 6.6 3 (10 V/m) 5.3 (LFS)
SURGES AC POWER 6.4.3 2 (0,5 kV line 5.1 (NP)
(transient to line)
phenomenon) (1 kV line to
ground)
6.4.3 3 (1 kV line to 5.3 (LFS) (note 2)
line)
(2 kV line to
ground)
OUTDOOR SIGNAL 6.4.1
table 1/K.20 No1 1 kV 5.3 (LFS) (note 2)
table 2/K.20 No2 4 kV (note 1) 5.3 (LFS) (note 2)
INDOOR 6.4.2 500 V 5.2 (RP) (note 4)
SIGNAL
CONDUCTED AC POWER 6.5 2 (3 V) 5.1 (NP)
(CONTINUOUS) DC POWER 6.5 2 (3 V) 5.1 (NP)
SIGNAL 6.5 2 (3 V) 5.1 (NP)
EMISSION COUPLING REFERENCE LIMITS COMPLIANCE
(PORT) (subclause) CRITERION
CONDUCTED AC POWER 7.2.2 Class A
EMISSIONS DC POWER 7.2.3 See subclause 7.2.3
SIGNAL 7.2.1 Class A
RADIATED EMISSION ENCLOSURE 7.3 Class A
NOTE 1: Only to be applied when primary protection is fitted.
NOTE 2: Compliance criteria 5.4 (LFC) or 5.5 (LFO) may be more appropriate for some product types.
NOTE 3: Values given in parentheses are for information only.
NOTE 4: When using coupling/decoupling networks with surge arrestors, the compliance criterion 5.3 may be specified.

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ETS 300 386-1: December 1994
Table 3: Public telecommunications equipment in telecommunication centres, high priority of
service
COMPLIANCE
PHENOMENON COUPLING REFERENCE TEST LEVEL (note 3) CRITERION
(PORT) (subclause) (subclause)
IMMUNITY
ESD ENCLOSURE 6.2 2 (4 kV Cont) 5.1 (NP)
(transient (4 kV Air)
phenomenon) 6.2 3 (6 kV Cont) 5.2 (RP)
(8 kV Air)
EFT AC POWER 6.3 3 (2 kV) 5.1 (NP
...