SIST ETS 300 001 E4:2003

SLOVENSKI STANDARD
01-december-2003
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Attachments to the Public Switched Telephone Network (PSTN); General technical
requirements for equipment connected to an analogue subscriber interface in the PSTN
Ta slovenski standard je istoveten z: ETS 300 001 Edition 4
ICS:
33.040.35 Telefonska omrežja Telephone networks
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 001
TELECOMMUNICATION January 1997
STANDARD Fourth Edition
Source: ETSI TC-TE Reference: RE/ATA-001016.4
(formerly: RE/TE-04-16.4)
ICS: 33.020
Key words: PSTN, access, TE
Attachments to Public Switched Telephone Network (PSTN);
General technical requirements for equipment connected to
an analogue subscriber interface in the PSTN;
Chapter 1: General
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.fr
Tel.: +33 4 92 94 42 00 - Fax: +33 4 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 1997. All rights reserved.

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ETS 300 001: January 1997
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 300 001: January 1997
Contents
Foreword .5
1 General.7
1.1 Introduction .7
1.1.1 Foreword .7
1.1.2 NETs .7
1.1.3 Types of NET .8
1.1.4 NET 4 .8
1.2 Scope.8
1.3 Method of use .11
1.3.1 Structure of the ETS.11
1.3.2 Use of requirements and tests .11
1.4 Definitions of terms used in this ETS.11
1.4.1 Local subscriber line (analogue) .11
1.4.2 Public Switched Telephone Network (PSTN).12
1.4.3 PSTN connection point.12
1.4.4 Terminal equipment .13
1.4.4.1 General definitions.13
1.4.4.2 Types of TE .16
1.4.4.3 Reference model of a TE.18
1.4.4.4 Testing point .19
1.4.5 States or conditions of TE .22
1.4.5.1 Quiescent or idle state or condition .24
1.4.5.2 Ringing state or condition .25
1.4.5.3 Loop state or condition .25
1.4.5.4 Dialling or signalling state or condition .26
1.4.5.5 Register recall state or condition .26
1.4.6 Line terminals.26
1.4.7 Speech band .26
1.5 DC feeding arrangements.27
1.5.1 Requirement values for feeding conditions .34
1.5.2 Test values for feeding conditions.38
1.6 Test parameters.41
1.6.1 Environmental conditions .41
1.6.2 Tolerances of components used for testing .41
1.6.3 Test equipment accuracy .41
1.6.4 Test equipment resolution.41
1.6.5 Measurement values.41
1.6.6 TE connection .42
1.6.6.1 Series-connected TEs .42
1.6.6.2 Additional wires.42
1.7 Summary of network tones and signals (informative).42
1.7.1 Dial tone .42
1.7.2 Ringing tone .46
1.7.3 Busy tone.47
1.7.4 Congestion tone .49
1.7.5 Special information tone(s).51
1.7.6 Call in progress tone .55
1.7.7 Tones for other purposes .56
1.7.8 Frequencies for pulse metering.65
1.7.9 Ringing signal.68
1.8 Abbreviations .73
1.9 National designators .76
1.10 Symbols .77
1.11 Summary of references .79
History.83

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ETS 300 001: January 1997
Foreword
Chapter 1 of this European Telecommunication Standard (ETS) has been produced by the Terminal
Equipment (TE) Technical Committee of the European Telecommunications Standards Institute (ETSI).
The text of this ETS may be utilized, wholly or in part, for the establishment of NET 4.
For historical purposes, this ETS was drafted in the form of a NET. However, the terms NET or NET 4 in
this document should be read as ETS or ETS 300 001 respectively.
This ETS comprises ten chapters:
"Attachments to Public Switched Telephone Network (PSTN); General technical requirements for
equipment connected to an analogue subscriber interface in the PSTN".
Chapter 1 - General
Chapter 2 - DC characteristics
Chapter 3 - Ringing signal characteristics
Chapter 4 - Transmission characteristics
Chapter 5 - Calling functions
Chapter 6 - Answering function
Chapter 7 - Power failure
Chapter 8 - Connection methods
Chapter 9 - Special functions
Chapter 10 - Additional unclassified requirements
This is the first chapter providing, among other information, the scope of this ETS, definitions, symbols
and abbreviations, an explanation of the structure of the ETS and its method of use.
This ETS contains requirements and associated compliance tests. Each compliance test has been
assigned a section number which is identical to that of the related requirement and has been given the
prefix "A". The requirements and their associated compliance tests are grouped together in the main body
of this ETS.
National variations to each requirement and test, which may be particular to an Administration, are given
as additional text within the body of each requirement or test. The national designations used are given in
section 1.9 of this chapter. Section 1.3 provides further details on the structure and how to use this ETS.
Transposition dates
Date of latest announcement of this ETS (doa): 30 April 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 October 1997
Date of withdrawal of any conflicting National Standard (dow): 31 October 1997

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ETS 300 001: January 1997
1 General
1.1 Introduction
1.1.1 Foreword
It is recognised, in the field of telecommunications within Europe, that there is a need to create common
European standards for telecommunication equipment.
Such harmonisation would, among other things, facilitate co-operation between telecommunication
equipment manufacturers and public telecommunication network operators, create a marketplace which
naturally transcends that of national frontiers, enhance the efficiency of business and other
communications across Europe to bring economic benefits, and help translate the vision of a united
Europe into a working reality.
In 1985, an initiative by the Conference of European Posts and Telecommunications Administrations
(CEPT) resulted in the drafting of a Memorandum of Understanding (MoU) agreeing to the mutual
recognition of results of tests of conformity to a technical specification which would be known as a Norme
Européenne de Telecommunication (or NET). The signatories of the MOU represent the
telecommunications administrations of most countries in Western Europe, including EEC and EFTA
administrations.
In 1986, European Community Council Directive 86/361/EEC laid down the principles of the initial stage of
the mutual recognition of type approval for telecommunications Terminal Equipment (TE). The Directive
imposes the obligation on EC Member States to implement the recognition of tests to common conformity
specifications.
1.1.2 NETs
The guiding principals under which a NET is written are the need to ensure that essential requirements
are met.
These include:
- user safety, insofar as this requirement is not covered by other legal instruments (e.g. Directive
73/23/EEC);
- safety of employees of the public telecommunication network operators, insofar as this requirement
is not covered by other legal instruments (e.g. Directive 73/23/EEC);
- protection of public telecommunication networks from harm;
- interworking of TE, in justified cases.
Each NET constitutes part of a series of NETs prepared in response to the MOU and the EC Directive
86/361.
A NET details the requirements, and a specification of interface tests for conformance to those
requirements, which a defined type of telecommunication TE is required to satisfy in order to obtain
authorisation for connection of the equipment to a defined European Telecommunications Network. The
NET also includes, where appropriate, requirements made necessary in a given State by historical
network peculiarities.
The existence of a NET will make it possible for an accredited laboratory in a country whose
administration has signed the MOU, to carry out tests, specified in the NET, on TE submitted to it, and to
issue a test report. On the basis of the report, a competent body may then issue a certificate of conformity
to the NET. There may of course be cases where the laboratory itself is the competent certification
authority. This certificate is then recognised as valid in all other signatory countries, avoiding the need for
the equipment to have to undergo the same tests, over and over again, each time approval is applied for
in any of those countries.
The common reference point which a NET represents thus offers the opportunity of substantially reducing
the complexity, length and cost of approval formalities. The operators of public networks are required to
make reference to relevant NETs in public supply contracts. Manufacturers are thereby enabled to
compete on a more equal technical basis in the supply of terminal equipment covered by NETs.

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ETS 300 001: January 1997
1.1.3 Types of NET
The majority of NETs fall into one of two categories; access NETs and terminal NETs as described below;
a) Access NET
Details of the technical characteristics (electrical, mechanical and access control protocols), to be
offered by TE at the interface to a specific public telecommunications network are covered in an
access NET.
The objective of an access NET is to ensure no disturbance occurs to the network and to ensure
interworking between network and TE so that calls can be routed successfully through the network
(but without any guarantee of terminal to terminal operation). Indeed, since an access NET may
have to serve a number of terminal NETs and applications which have not even been envisaged at
present, it is important for the content not to include anything which is particular to a specific
terminal or otherwise inhibiting to new developments.
b) Terminal NET
The objective of a terminal NET is to ensure the end-to-end compatibility of a defined
telecommunication service. The terminal NET should indicate any requirement which must be
added to the corresponding access NET(s) to ensure end-to-end communication.
1.1.4 NET 4
ETSI has adopted this approach in the generation of NETs, but labelled as follows:
a) Aspect 1 - General requirements;
b) Aspect 2 - Access requirements;
c) Aspect 3 - TE requirements.
This document is a candidate for adoption as an access NET and is to be used for type approval
according to the scope stated in section 1.2.
TE submitted for type approval is subject to Aspect 1 requirements in every case and, in addition to other
relevant requirements e.g. NETs, international or national specifications. Such additional requirements are
not contained in this document.
Aspect 3 NETs or other national standards which are relevant to a given type of TE meeting the
requirements of this NET shall be in addition to, and refer to the requirements in this NET and shall not
modify the requirements in this access NET.
1.1.4 (D) 1 In accordance with the three level approach of EG and ETSI, all TEs have to
fulfil in addition to the requirements stated in this document the following Aspect
1 requirements:
- electrical safety;
- climatic environment;
- EMC.
As long as there are no European recommendations for electrical safety, climate
and EMC, the relevant enclosures of the national specifications 1 TR 2, Part 1
are applicable.
1.2 Scope
This Access ETS specifies the technical requirements (electrical, mechanical and method of signalling)
and their associated compliance tests to be met by all TE at each of its ports provided for connection to
the Public Switched Telephone Network (PSTN). This connection is effected at a standard analogue
interface. This interface is characterised by a two-wire derived presentation using dc loop seizure and
clear and low-frequency ac ringing signals below the speech passband.

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ETS 300 001: January 1997
These requirements and associated compliance tests form the definition of the standard analogue PSTN
access (Aspect 2) in each of the participating Administrations.
It is recognised that for historical reasons requirements and their associated compliance tests may include
values particular to each Administration's network. These requirements reflect existing standards.
This access ETS does not necessarily contain all the requirements which a specific type of TE shall meet
in order to gain type approval for attachment to the relevant PSTN attachment point.
1.2 (BG) 1 This ETS does not form the type approval requirements for equipment that
contain certain call routing or certain switching functions, in these cases
Bulgarian national requirements apply and reference shall be made to the
Bulgarian Approval Authority in order to determine the totality of applicable
requirements and associated tests.
This ETS is applicable for telecommunications systems in which the a/b input
wires are switched galvanically to the extension lines.
1.2 (CZ) 1 This ETS applies to Terminal Equipment (TE) connected to the analogue
interface of the Public Switched Telephone Network (PSTN).
It does not apply to mobile radiotelephony and terminal equipment for which
technical specifications exist, e.g. public coin or card telephone equipment,
shared subscriber lines, transmission and line-sharing subscriber equipment.
This ETS applies to more complex systems connected to the PSTN which:
- enable the interconnection of one PSTN access point with at least two other access
points, or
- is able to interconnect two PSTN access points mutually, or
- is able to simultaneously transmit identical information to two or more PSTN access
points.
1.2 (CZ) 2 For terminal equipment connected to shared subscriber lines or to transmission
or line-sharing subscriber equipment, modified or additional requirements given
in the technical specifications are valid.
1.2 (SF) 1 This document does not form the type approval requirements for TE that contain
call routing and switching functions except very small PBXs or key systems with
1 or 2 trunk lines. For TE with more trunk lines, the national standards apply.
1.2 (F) 1 The national values contained in the current issue of this NET are not applicable
to the standard analogue interface used for the connection to the PSTN when
connecting a complex installation. For these types of installation, connection to
the PSTN is covered by:
- I-ETSs 300 003 and 300 004 for transmission characteristics of digital PABXs;
- national standards for other characteristics of digital PABXs and for other complex
installations, until a new enhancement of this ETS will be available.
Complex installations are hereby understood as equipment:
- including switching capability to interconnect at least one PSTN access with at least
two other ports (e.g. PBXs);
or
- able to interconnect PSTN accesses (e.g. call diverting devices);
or
- able to broadcast the same information to several PSTN accesses at the same time.

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ETS 300 001: January 1997
1.2 (D) 1 This type approval specification defines the requirements to be met by all
terminal equipment intended for connection to analogue accesses (with the
exception of emergency telephone and direct dialling-in accesses) in the
telephone network / ISDN of Deutsche Bundespost TELEKOM. Where a
technical test is provided for reference is made to the corresponding
measurement method. Where compliance with a specific requirement is not
verified by means of a test, the requirement shall nevertheless befulfilled if it is
applicable to the area(s) for which a terminal is designed.
Unless otherwise stated, the requirements given in this type approval
specification apply to the network termination of the analogue switched access,
i.e. the refer exclusively to this interface and shall also be met in the case where
several terminals are to be used collectively at this one interface.
1.2 (D) 2 This guideline does not apply to TE intended to be connected to:
- user access for broadcast services;
- radiopaging accesses;
- special telephone accesses;
a) mobile radiotelephone accesses;
b) accesses for maritime mobile communication;
c) Rhine radiotelephone accesses;
d) emergency telephone accesses for the police and fire brigade;
e) public emergency call boxes;
- telephone accesses with Impulskennzeichengabe (IKZ);
- telephone accesses with Gleichstromkennzeichengabe (GKZ);
- accesses for Group 1 fixed connections (leased lines);
- accesses for the warning and alarm service.
For these accesses special regulations apply.
1.2 (I) 1 This document does not form the type approval requirements for those TE that
contain call routing or switching functions. In these cases Italian national
requirements apply. In every case, reference must be made to the Italian
Approval Authority in order to determine the totality of applicable requirements
and associated tests.
1.2 (NL) 1 This document does not contain the type approval requirements for those TE
that contain call routing and switching functions, nor the additional access
requirements for those especially designated for the support of PSTN facilities
(i.e. PSTN Calling Line Identification presentation) or for the use of specific
PSTN properties (i.e. battery reversal as seizure / release indication). In these
cases Dutch national requirements apply and reference must be made to the
Dutch Approval Authority in order to determine the totality of applicable
requirements and associated tests.
1.2 (N) 1 This document does not contain the type approval requirements for those
equipment that includes call routing and switching functions, and which provides
local dc loop current on the extension side of the equipment. In these cases the
Norwegian national requirements apply.
1.2 (S) 1 This standard shall not form the type approval requirements for user classes of
equipment that are characterised as providing:
- multiple lines to the PSTN;
- multiple ports for separately identifiable terminal equipment;
- switching and routing functions; and
- the capability of providing additional telecommunication services at these ports not
provided by the PSTN.
Accordingly, this document is not applicable for PBXs and other private
telecommunication networks nodal components.
In these cases the Swedish national requirements apply.

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1.2 (CH) 1 For legal purposes the Swiss national requirements apply. The present
document was up-dated according to the last version (July 1995) of the Swiss
national requirements and can be used for every kind of TE (e.g.: voice, data or
PABX). The Swiss national requirements are based on the present document
(technical aspects) and introduce additional regulatory aspects.
1.2 (GB) 1 This document does not form the type approval requirements for equipment that
contain certain call routing or certain switching functions, in these cases UK
national requirements apply and reference must be made to the UK Approval
Authority in order to determine the totality of applicable requirements and
associated tests.
1.3 Method of use
1.3.1 Structure of the ETS
This ETS contains requirements and associated compliance tests. Each compliance test has been
assigned a section number which is the same as the related requirement and has, in addition, a prefix "A".
Thus the requirements and their associated compliance tests are grouped together in the main body of the
document.
Where applicable, each requirement and associated compliance test have harmonised text which includes
parameters to which each Administration may assign its own values. In these cases, parameter values are
set out in accompanying tables.
National variations to each requirement and test which may be particular to a single Administration are set
out as additional text within the body of each requirement or test. These are designated nationally
according to the convention set out in section 1.9 and are referenced in the "remarks" column of relevant
tables.
This ETS includes a number of Chapters, arranged according to general technical content; Chapter 1
includes introductory information of a general nature, definitions and abbreviations. Chapter 10 includes
technically unclassified additional national requirements and tests particular to various Administrations. It
may therefore be necessary, in order to determine the total requirement and compliance test in any given
case, to refer to the harmonised text and its national variations as well as to the relevant contents in
Chapter 10.
1.3.2 Use of requirements and tests
Each of the requirements in the common text of this document is a harmonised text. The use of each
requirement by each Administration is determined by parameter values shown in the requirement table(s)
and may be qualified further by remarks. These are set out in the requirement table(s).
It is common to find that certain requirements are to be met over ranges of parameter values; for
example, return loss values might be required to be met over two independent ranges of frequency and of
loop current. In such cases, compliance may be determined by testing at a limited number of parameter
test values within these ranges. Such cases are clearly set out. TE which, on the basis of testing outlined
in this document, appears to comply with a requirement but which subsequently is found to be non-
compliant at an untested point within the range must be considered according to the relevant type
approval procedures under which this document is used.
1.4 Definitions of terms used in this ETS
The following terms are given particular meaning within this ETS. Other technical terms not specifically
mentioned are to be taken according to their normally accepted meaning.
1.4.1 Local subscriber line (analogue)
An analogue subscriber line is part of a local telephone network and is traditionally metallically connected
to the analogue interface of an exchange port by means of two wires (normally termed the a-wire and the
b-wire) and to which an unique telephone network address has been assigned (telephone number).

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NOTE: This definition does not exclude standard analogue interfaces of the PSTN where a
unique telephone network address is assigned to a number of such separate physical
presentations.
1.4.2 Public Switched Telephone Network (PSTN)
A generally used term for the nation-wide public telephone network comprising interconnected telephone
exchanges capable of switching telephone calls between telephones connected to the network
(exchanges).
1.4.3 PSTN connection point
The point where the local subscriber line (analogue) is terminated, the PSTN standard analogue interface
is presented and the TE is connected. Reference is made to figure 1.4.4.3.
a) Leads a and b are provided for connection to the PSTN.
1 1
b) Leads a and b (if they are provided) are intended for the connection of this TE in series with
2 2
other TEs.
c) Additional leads for instance n (if provided) are intended for auxiliary connections, to be defined by
the National Administrations' Network Termination Schedules (Chapter 8).
d) Additional leads for instance n (if provided) are intended for optional connections, to other TEs, to
be defined in Chapter 8.
e) Lead "e" (if provided) is intended for connection to signal earth.
f) Figure 1.4.4.3 does not indicate that TEs may have other interfaces. These interfaces are not
described in this document.
1.4.3 (CZ) 1 Requirements for the correct operation of TE connected to the PSTN CP:
Interworking between several TE (connected to one PSTN CP) requires that the
following requirements, which define the basic design criteria of all PSTN
connectable TE, are complied with.
They are:
a) Attachment of the ringing signal detectors.
Only a limited number of ringing signal detectors circuits (i.e. the number of TE with
their ringing signal detectors connected in parallel on the input terminals a1 and b1 of
the TE) may be connected in parallel to the "a" and "b" terminals of the PSTN CP. The
maximum number of such connected signal circuits (respectively TE) is given by the
sum of the REN-CZ numbers (definition and calculation of REN-CZ - see subclauses
3.1.1 (CZ) 3, 3.1.1 (CZ) 4, 8.3 (CZ) 1.2 and 8.3 (CZ) 1.3).
b) The attachment of the speech circuits.
At the PSTN CP, the TE shall be connected to the "a" and "b" wires in a manner which
ensures only one speech circuit can be connected at any given time. When in loop
state, such a speech circuit shall prevent any other connected speech circuit from
seizing the loop.
c) TE operational independence of 230 V mains.
At least one TE out of several connected to a PSTN CP shall enable subscribers to
dial out to the PSTN in order to establish speech communication with other
subscribers and shall recognize an incoming call independently from any mains power
supply.
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ETS 300 001: January 1997
d) Subscriber′s line integrity check.
The integrity of the subscriber′s line is continuously checked from the telephone exchange.
1.4.3 (E) 1 Common reference terminal
The common reference terminal is defined as the terminal or lead provided for
connection to a common reference potential, for the functional purpose of
receiving longitudinal 50 Hz metering pulses. In the Spanish contribution (E) this
terminal or lead is normally called "REF", and it may either be connected
internally to the earth terminal or lead "e", when it exists, or not.
1.4.4 Terminal equipment
1.4.4.1 General definitions
Terminal equipment is defined as an equipment which is intended to be connected to a termination point
of PSTN (PSTN connection point: PSTN CP).
One-port TE is defined as TE with wires or leads intended solely for connection to a PSTN CP (see figure
1.4.4.1.a).
Figure 1.4.4.1.a: One-port TE
Series-connected TE is defined as TE intended to be attached to a PSTN CP and which in addition
provides a second connection point to which a second TE may be attached so as to permit this second TE
to be excited solely by loop current wholly derived from the PSTN connection (see figure 1.4.4.1.b).
Figure 1.4.4.1.b: Series-connected TE
NOTE: Two or more TE can be connected to the PSTN CP in parallel (see figure 1.4.4.1.c).

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Figure 1.4.4.1.c: Parallel connected TE
1.4.4.1 (A) 1 For TE with telephony functions (e.g. telephone set) a parallel connection in loop
condition is not permitted. This requirement shall be fulfilled at series-connected
TE generally. Reference is made to chapter 8.
1.4.4.1 (CZ) 1 One port TE
A 1-port TE is defined from the attachment point of view as a 2-pole TE, Type 1
or Type 2 (see figure 1.4.4.2.and 1.4.4.2.b).
1.4.4.1 (CZ) 2 Series-connected TE
A series connected TE is defined from the attachment point of view as a 4-pole
TE, Type 3 (I), Type 3 (II) or type 4 (see figure 1.4.4.2 c, 1.4.4.2 d or 1.4.4.2 e).
1.4.4.1 (CZ) 3 TE for independent operation
TE for independent operation shall be able to operate independently of other
TEs when connected to the PSTN CP. This applies to TEs meeting the following
requirements:
a) the TE shall implement means to enable a subscriber to engage in interactive speech
communication with the connected party;
b) the TE shall implement means to enable a subscriber to establish a link to another
PSTN CP;
c) the TE shall implement means to alert a subscriber of incoming calls, either
acoustically or optically, or to activate an automatic application, depending on the type
of TE;
d) in accordance with subclause 7.1 (CZ) 1, the basic TE functions described in
subclause 1.4.4.1 (CZ) 3 (a), (b) and (c), shall not require a mains power feed;
e) the ringing signal detectors of a Type 1, Type 3 (I) or Type 3 (II) TE shall meet the
requirements of subclause 3.1.1 (CZ) 1.

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ETS 300 001: January 1997
1.4.4.1 (CZ) 4 Additional TE
An additional TE is defined as that TE which when connected to the PSTN CP
can only function together with an independent TE, or in the case of several
TEs, where one of them is an independent TE. An additional TE is any TE which
does not comply with one or more of the requirements in subclause
1.4.4.1 (CZ) 3.
1.4.4.1 (CZ) 5 Multi-line TE
A multi-line TE shall be equipped with two or more terminations (designated 1a ,
1b and 2a , 2b to na , nb ) intended for connection at the same time to two or
1 1 1 1 1
more different PSTN CPs (i.e. two separate subscriber lines terminated with a
standard PSTN CP according to subclause 1.4.3).
1.4.4.1 (D) 1 Terminal equipment is equipment which is intended for connection to the
telephone network / ISDN of Deutsche Bundespost TELEKOM, i.e.:
a) which is intended to be directly connected to the network termination of the telephone
network / ISDN of Deutsche Bundepost TELEKOM or
b) which is intended to interwork with a telecommunications network and thereby be
directly or indirectly connected to the network termination of the telephone network /
ISDN of Deutsche Bundespost TELEKOM,
in order to transmit, process or receive information.
1.4.4.1 (DK) 1 A PABX is
- either a TE with one port to the PSTN CP (NCP-port) and one port for attachment of a
second TE (TE-port), where the second TE is not excited solely by loop current from
the NCP-port,
- or a TE with more than two ports, whereof at least one NCP-port and one TE-port.
A PABX shall, unless specified otherwise, comply at each NCP-port with the
requirements to a one-port TE.
1.4.4.1 (E) 1 (This remark relates to series-connected TEs).
PROVISION: Network compatibility cannot be expected if several series TEs are
simultaneously connected in series to the same line.
NOTE: In the Spanish contribution (E), the additional requirements for series TEs have the
word "series" included in brackets in the requirement heading.
1.4.4.1 (E) 2 Associated TE
Associated TE is defined as a TE which is approved for connection to the
network. This name is normally used, in the Spanish contribution (E), to
designate a TE which is connected to the line output terminals of a series-
connected TE.
1.4.4.1 (E) 3 Multiline TE
Multiline TE is defined as a TE which is able to be connected to either more than
one PSTN connection point, or to a multiline PSTN CP.
NOTE: In the Spanish contribution (E), the additional requirements for multiline TEs have the
word "multiline" included between brackets in the requirement heading.

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ETS 300 001: January 1997
1.4.4.2 Types of TE
TE can generally be categorised into one or more of the following types:
Type 1: One-port TE capable of holding the loop condition by itself (e.g. telephone set),
see figure 1.4.4.2.a.
Figure 1.4.4.2.a: One-port TE (loop holding)
Type 2: One-port TE not capable of holding the loop condition by itself (e.g. ringing
detector) see figure 1.4.4.2.b.
Figure 1.4.4.2.b: One-port TE (non-loop holding)
Type 3: A series-connected TE through which the loop condition to another TE can be
maintained, but is capable of holding the loop condition by itself. It is possible for
this type to have two arrangements:
Type 3 (I): The loop is held but the output port is disconnected (e.g. modem), see figure
1.4.4.2.c.
Figure 1.4.4.2.c: Series-connected TE (loop holding, output disconnected)
Type 3 (II): The loop is held and the output port remains connected (e.g. answering
machine), see figure 1.4.4.2.d.
Figure 1.4.4.2.d: Series-connected TE (loop holding, output connected)

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ETS 300 001: January 1997
Type 4: A series-connected TE through which the loop condition to another TE can be
maintained, but is not capable of holding the loop condition by itself (e.g.
monitoring device), see figure 1.4.4.2.e.
Figure 1.4.4.2.e: Series-connected TE (non-loop holding)
1.4.4.2 (CZ) 1 Connection of one-port Type 2 TE to the PSTN CP
A Type 2 TE, intended for attachment to one PSTN CP shall be connected via
an adapter (shown in figure 1.4.4.2 (CZ) 1 - marked as an ADAPTER) which
ensures that the one-port Type 2 TE has the a , b terminals directly connected
1 1
to the a , b terminals. Thus from the attachment point-of-view, the Type 2 TE
2 2
is converted to a Type 4.
Figure 1.4.4.2 (CZ) 1
1.4.4.2 (CZ) 2 Connection of a multi-line Type 2 TE to a PSTN CP
A multi-line Type 2 TE, intended for permanent connection to at least two PSTN
CPs, can be connected to a subscriber's line via the terminal plate (serving as
CP), on which the particular subscriber's lines are terminated.
All lines are simultaneously connected to the telephone socket intended for
connection of the other TE. From the attachment point-of-view, the Type 2 TE is
converted to a Type 4. The connection method described in
subclause1.4.4.2 (CZ) 1 can be used.

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ETS 300 001: January 1997
1.4.4.2 (CZ) 3 Connection of Type 3 and 4 TE to the PSTN CP
Type 3 and Type 4 TE which have terminals a , b and a , b routed seperately
1 1 2 2
to independent equipment sockets (if not stated otherwise) are connected to the
PSTN CP through the shared-line adapter, which converts the separate inputs
and outputs into one common connection cord (see the ADAPTER in figure
1.4.4.2 (CZ) 3. The allocation of the output terminals in the equipment socket on
the TE is shown in figure 8.3 (CZ) 2.5.
Figure 1.4.4.2 (CZ) 3
1.4.4.3 Reference model of a TE
A reference model of a TE is shown in figure 1.4.4.3.

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ETS 300 001: January 1997
Figure 1.4.4.3: TE reference model
1.4.4.3 (B) 1 The second plug (or socket) shown in figure 1.4.4.3 may be combined with the
first plug as a standard intermediate plug (see Chapter 8).
1.4.4.4 Testing point
Testing points are defined in table 1.4.4.4. in conjunction with figure 1.4.4.4 (see also figure 1.4.4.3).
Figure 1.4.4.4: Definition of testing point

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ETS 300 001: January 1997
Table 1.4.4.4: Testing points
TESTING POINT
Remarks
COUNTRY
TP TP TP TP TP TP TP
0 1 2 3 4 5 6
Austria X X yes
Belgium X X yes
Bulgaria X X
Cyprus X X yes
Czech X X X X yes
Republic
Denmark X X X X yes
Finland X X X X yes
France X X X X
Germany X yes
Greece X X X X yes
Hungary X X X X yes
Iceland X X
Ireland yes
Italy X X X X yes
Luxembourg X X
Malta
Netherlands X X
Norway X X X X yes
Poland X X yes
Portugal X X X X X yes
Spain X X yes
Sweden X X X X yes
Switzerland X X X X yes
U. Kingdom X X X X X X
1.4.4.4 (A) 1 Testing point TP shall be used if cross-talk is possible to other circuits.
1.4.4.4 (B) 1 In case of multiline TE, the testing points may be TP (or TP ) and TP (or TP ).
2 3 5 4
1.4.4.4 (CY) 1 TP shall only be used in case the cord is removable.
1.4.4.4 (CZ) 1 If the TE is equipped with a lead-in or an interconnecting cord which can be
terminated with the connector plug or telephone socket (see subclauses
8.1 (CZ), 8.2 (CZ) and 8.3 (CZ)), the measurement of TE shall be performed,
with these cords connected to the TP0 and TP6 test points.
1.4.4.4 (CZ) 2 If the TE is not equipped with a lead-in cord intended for connection to the STZ
or TZU (TZ), or if it is not adapted for connection of the lead-in cord according to
figure 8.2 (CZ) 1.1, the TE shall be measured at test point TP3 (or TP4 if the TE
is series-connected).
1.4.4.4 (DK) 1 If the TE is provided with a cord, the type approval shall include plug and cord. If
the TE is provided with a permanent connection (e.g. screws), the testing shall
be performed using TP and TP , respectively.
3 4
1.4.4.4 (SF) 1 If the TE is provided with a cord, the type approval shall include the plug and
cord (testing point TP ). If the TE is provided with a permanent connection (e.g.
screws), the testing shall be performed using TP .
In case of a series-connected TE testing point TP or TP is used, depending on
4 6
whether the series-connected TE has plug and cord or a permanent connection.

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ETS 300 001: January 1997
1.4.4.4 (D) 1 See 1.2 (D) 1.
1.4.4.4 (GR) 1 If the TE is provided with a cord, the type approval shall include the plug and
cord. If the TE is provided with a permanent connection (e.g. screws), the
testing shall be performed using TP and TP if it exists.
3 4
1.4.4.4 (H) 1 If the TE is provided with a cord, the type approval shall include the plug and
cord. If the TE is provided with a permanent connection (e.g. screws), the
testing shall be performed using TP and TP .
3 4
1.4.4.4 (IRL) 1 If the TE is provided with a cord, the type approval shall include the plug and
cord. If the TE is provided with a permanent connection (e.g. screws), the
testing shall be performed using TP . The test points for series-connected
equipment where applicable on port a b shall be the second plug or socket if
2 2
supplied with the TE, or else TP .
1.4.4.4 (I) 1 If the TE is provided with a cord, the type approval shall include the plug and
cord. If the TE is provided with a permanent connection (e.g. screws), the
testing shall be performed using TP and TP if it exists.
3 4
1.4.4.4 (N) 1 If the TE is provided with a cord, the type approval shall include the plug and
cord. If the TE is provided with a permanent connection (e.g. screws), the
testing shall be performed using TP .
1.4.4.4 (N) 2 If the TE is provided with a cord, TP is used. If the TE is provided with a
permanent connection, the If the TE is provided with a is used.
1.4.4.4 (PL) 1 If the TE is provided with a cord, the type approval shall include the plug and the
cord. If the TE is provided with a permanent connection (e.g. screws), the
testing shall be performed using TP .
1.4.4.4 (P) 1 TE provided with cord(s) and plug(s) shall be tested with the related socket(s).
So, testing point TP shall be used.
1.4.4.4 (P) 2 Testing point TP shall be used for TE provided with a cord or a cord and a
connection box.
1.4.4.4 (P) 3 Testing point TP shall be used for TE provided with a cord, a cord and a
connection box or a cord and a socket.
1.4.4.4 (P) 4 Testing points TP and TP shall be used for TE provided with no cords.
3 4
1.4.4.4 (E) 1 The cord which is shown in figure 1.4.4.4 cannot be a constitutive part of the
TEUT, but the plug shall be.
NOTE: When the TEUT is provided with an earth (or protective earth) termi
...