ETSI TBR 021 ed.1 (1998-01)

Terminal Equipment (TE); Attachment requirements for pan-European approval for connection to the analogue Public Switched Telephone Networks (PSTNs) of TE (excluding TE supporting the voice telephony service) in which network addressing, if provided, is by means of Dual Tone Multi Frequency (DTMF) signalling

DTBR/ATA-005055

Terminalska oprema (TE) - Priključitvene zahteve za vseevropsko odobritev za priključevanje na analogna javna komutirana telefonska omrežja (PSTNs) terminalske opreme (razen TE, ki podpira storitev govorne telefonije), pri kateri je omrežno naslavljanje, če je na voljo, izvedeno s tonsko signalizacijo (DTMF)

General Information

• Status: Published
• Publication Date: 25-Jan-1998
• Technical Committee: ATA - Analogue Terminals & Access
• Current Stage: 13 - TB decision to make document historical
• Due Date: 07-Apr-2006
• Completion Date: 24-Apr-2006
• Mandate: T-318
• Ref Project: SIST TBR 021 E1:2004 - Terminal Equipment (TE); Attachment requirements for pan-European approval for connection to the analogue Public Switched Telephone Networks (PSTNs) of TE (excluding TE supporting the voice telephony service) in which network addressing, if provided, is by means of Dual Tone Multi Frequency (DTMF) signalling

Standards Content (Sample)

SLOVENSKI STANDARD
SIST TBR 021 E1:2004
01-oktober-2004
7HUPLQDOVNDRSUHPD7(3ULNOMXþLWYHQH]DKWHYH]DYVHHYURSVNRRGREULWHY]D
SULNOMXþHYDQMHQDDQDORJQDMDYQDNRPXWLUDQDWHOHIRQVNDRPUHåMD3671V
WHUPLQDOVNHRSUHPHUD]HQ7(NLSRGSLUDVWRULWHYJRYRUQHWHOHIRQLMHSULNDWHULMH
RPUHåQRQDVODYOMDQMHþHMHQDYROMRL]YHGHQRVWRQVNRVLJQDOL]DFLMR'70)
Terminal Equipment (TE); Attachment requirements for pan-European approval for
connection to the analogue Public Switched Telephone Networks (PSTNs) of TE
(excluding TE supporting the voice telephony service) in which network addressing, if
provided, is by means of Dual Tone Multi Frequency (DTMF) signalling
Ta slovenski standard je istoveten z: TBR 021 Edition 1
ICS:
33.040.35 Telefonska omrežja Telephone networks
SIST TBR 021 E1:2004 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST TBR 021 E1:2004

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SIST TBR 021 E1:2004
TECHNICAL TBR 21
BASIS for January 1998
REGULATION
Source: ATA Reference: DTBR/ATA-005055
ICS: 33.020
Key words: PSTN, terminal equipment
Terminal Equipment (TE);
Attachment requirements for pan-European approval
for connection to the analogue Public Switched Telephone
Networks (PSTNs) of TE (excluding TE supporting the voice
telephony service) in which network addressing, if provided, is
by means of Dual Tone Multi Frequency (DTMF) signalling
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: [e-mail]
Tel.: [phone] - Fax: [phone]
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 1998. All rights reserved.

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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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Contents
Foreword .7
Introduction.9
1 Scope .11
2 Normative references.11
3 Definitions and abbreviations .12
3.1 Definitions .12
3.1.1 General terms.12
3.1.2 States .13
3.2 Abbreviations .13
4 Requirements.14
4.1 General requirement.14
4.2 Physical characteristics of the connection to the PSTN .14
4.3 Requirements under all conditions .15
4.3.1 Polarity.15
4.4 General requirements in quiescent state.15
4.4.1 DC resistance.15
4.4.2 Characteristics of TE for ringing signals.15
4.4.2.1 Impedance.15
4.4.2.2 Transient response.15
4.4.2.3 DC current .16
4.4.3 Impedance unbalance about earth.16
4.4.4 Resistance to earth .16
4.5 Ringing signal detector sensitivity.17
4.6 Transition from quiescent to loop state.17
4.6.1 Acceptance of breaks in the loop in a call attempt.17
4.6.2 Loop current characteristics .18
4.7 General loop steady state requirements.19
4.7.1 DC characteristics .19
4.7.2 Impedance.20
4.7.3 Sending level limitations.21
4.7.3.1 Mean sending level.21
4.7.3.2 Instantaneous voltage.21
4.7.3.3 Sending level in a 10 Hz bandwidth.21
4.7.3.4 Sending level above 4,3 kHz .22
4.7.4 Impedance unbalance about earth.23
4.7.4.1 Longitudinal Conversion Loss.23
4.7.4.2 Output Signal Balance.23
4.7.5 Resistance to earth .24
4.8 Call attempt.24
4.8.1 Automatic dialling .24
4.8.1.1 Dialling without dial tone detection.24
4.8.1.2 Dialling with dial tone detection.25
4.8.2 DTMF signalling .25
4.8.2.1 Frequency combinations.25
4.8.2.2 Signalling levels .25
4.8.2.2.1 Absolute levels.25
4.8.2.2.2 Level difference .26
4.8.2.3 Unwanted frequency components .26
4.8.2.4 Tone duration.26
4.8.2.5 Pause duration.26
4.8.3 Automatically repeated call attempts.26
4.9 Transition from loop to quiescent state.27

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4.10 Safety . 27
4.11 EMC . 27
Annex A (normative): Test methods. 28
A.1 General. 28
A.1.1 Equipment connection.28
A.1.2 Test environment . 28
A.1.3 Powered state . 29
A.1.4 Measurements to earth . 29
A.1.5 Equivalent test methods.29
A.1.6 Additional information to support the test. 29
A.2 Test impedances . 30
A.2.1 Reference impedance. 30
A.2.2 Non-reactive line termination. 30
A.3 Feeding bridge. 30
A.4 Test methods. 30
A.4.1 General requirement . 30
A.4.2 Physical characteristics of connection to the PSTN. 30
A.4.3 Requirements in all conditions . 31
A.4.3.1 Polarity. 31
A.4.4 General requirements in quiescent state . 31
A.4.4.1 DC Resistance. 31
A.4.4.2 Characteristics of TE for ringing signals. 32
A.4.4.2.1 Impedance . 32
A.4.4.2.2 Transient response . 33
A.4.4.2.3 DC current. 33
A.4.4.3 Impedance unbalance about earth . 34
A.4.4.4 Resistance to earth. 35
A.4.5 Ringing signal detector sensitivity . 36
A.4.6 Transition from quiescent to loop state . 37
A.4.6.1 Acceptance of breaks in the loop in a call attempt . 37
A.4.6.2 Loop current characteristics . 37
A.4.7 General loop state requirements. 38
A.4.7.1 DC characteristics. 38
A.4.7.2 Impedance. 39
A.4.7.3 Sending level limitations . 40
A.4.7.3.1 Mean sending level . 40
A.4.7.3.2 Instantaneous voltage. 41
A.4.7.3.3 Sending level in a 10 Hz bandwidth . 42
A.4.7.3.4 Sending level above 4,3 kHz. 43
A.4.7.3.4.1 Sending level above 4,3 kHz during
DTMF dialling . 43
A.4.7.3.4.2 Sending level above 4,3 kHz during
communication. 44
A.4.7.4 Impedance unbalance about earth . 45
A.4.7.4.1 Longitudinal Conversion Loss. 45
A.4.7.4.2 Output Signal Balance . 46
A.4.7.5 Resistance to earth. 47
A.4.8 Call attempt . 48
A.4.8.1 Automatic dialling. 48
A.4.8.1.1 Dialling without dial tone detection. 48
A.4.8.1.2 Dialling with dial tone detection. 48
A.4.8.2 DTMF signalling. 49
A.4.8.2.1 Frequency combinations. 49
A.4.8.2.2 Signalling levels . 50
A.4.8.2.3 Unwanted frequency components . 51
A.4.8.2.4 Tone duration. 52
A.4.8.2.5 Pause duration. 54
A.4.8.3 Automatically repeated call attempts. 55

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A.4.9 Transition from loop to quiescent state.56
Annex B (normative): TBR Requirements Table (TBR-RT).57
B.1 Guidance for completion of the TBR-RT.57
B.1.1 Condition table .57
B.1.2 Requirements table.57
Annex C (informative): Bibliography.60
History.61

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Foreword
This Technical Basis for Regulation (TBR) has been produced by the ETSI Project Analogue Terminals
and Access (ATA).
The present document has been produced by ETSI in response to a mandate from the European
Commission issued under Council Directive 83/189/EEC (as amended) laying down a procedure for the
provision of information in the field of technical standards and regulations.
The present document is intended to become a Harmonized Standard as requested by the above
mentioned mandate, the reference of which will be published in the Official Journal of the European
Communities referencing the Council Directive on the approximation of the laws of the Member States
concerning telecommunications terminal equipment, including the mutual recognition of their conformity
(Directive 91/263/EEC, known as "the TTE Directive").
A common technical regulation may be established by the European Commission in accordance with the
Directive.
Technical specifications relevant to the 91/263/EEC Directive are given in the TBR-Requirements Table
(TBR-RT) in annex B.
The voting phase for this TBR was undertaken on the understanding that the arrangements described
below will apply within the EU and that all necessary obligations will be laid down in any Commission
Decision for a Common Technical Regulation (CTR 21). These arrangements were agreed in a meeting
of the ACTE Heads of Delegation on 16th September 1997.
It is the intention that a pan-European approval scheme using TBR 21 as the basis will be legitimised, but
the scheme will recognize that nationally, technical differences exist and are described in Advisory Notes.
The Advisory Notes themselves will not be mandatory, however manufacturers will be encouraged to
ensure that their products conform to the relevant Advisory Notes. This recommendation will be reflected
in any Decision.
In the interests of transparency, the above mentioned Advisory Notes are contained in an ETSI Guide (EG
201 121). This ETSI Guide in no way changes the voluntary nature of Advisory Notes either de jure or de
facto. Initially, all Advisory Notes have been included and the adoption of the ETSI Guide has taken place
in parallel to the adoption of this TBR.
The maintenance of both the TBR and the ETSI Guide will follow the normal ETSI maintenance
procedures, based on experience.

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Transition Arrangements
A transition period of 12 months will permit parallel approval procedures for equipment falling within the
scope of the CTR. Thereafter national approvals for new equipment falling within the scope of the CTR will
not be permitted. However, national approvals may continue for equipment intended for applications
outside the scope of the CTR, e.g. terminals intended for series or parallel connection. Only such
equipment may be marked with national marks. Equipment, falling within the scope of TBR 21, and
approved against national regulations before the end of the transition period may continue to be placed on
the market after the end of the transition period.
Obligations of the manufacturer
a) During the transition period, manufacturers will be obliged to associate a notice with all
pan-European approval products.
The text of this notice is proposed as follows:
"The equipment has been approved to [Commission Decision “CTR 21”] for pan-European single
terminal connection to the Public Switched Telephone Network (PSTN). However, due to
differences between the individual PSTNs provided in different countries the approval does not, of
itself, give an unconditional assurance of successful operation on every PSTN network
termination point.
In the event of problems, you should contact your equipment supplier in the first instance."
The manufacturer should ensure that the seller and user of the equipment is clearly informed of
the above information by means of packaging and/or user-manuals.
The necessity of continuing to oblige manufacturers to use this notice after the transition period
has expired, shall be subject to a review in ACTE, based on experience with the Commission
Decision.
b) In addition, manufacturers must make a network compatibility declaration to the Notified Body, the
seller and user.
This declaration will indicate the networks with which the equipment is designed to work and any
notified networks with which the equipment may exhibit interworking difficulties.
The manufacturer shall also make it clear where network compatibility is dependent on physical
and software switch settings.
Obligations of the Notified Body
Notified Bodies shall ensure that the manufacturer complies with the provisions of the paragraph covering
the obligations of the manufacturer and that the network compatibility declarations referred to in a) and b)
above are made in the correct form.
The Notified Bodies should also ensure that manufacturers are aware of the applicable Advisory Notes
concerning the specific requirements of certain networks.
The Notified Body does not evaluate equipment against applicable Advisory Notes, since they are
voluntary. The role of the Notified Body in this respect is to clarify with the manufacturer the intended
purpose of the equipment.
During the transition period the National Authorities shall ensure that the Notified Bodies inform other
Notified Bodies of the network compatibility declarations whenever the approval is granted.

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Introduction
The existing analogue presentation of Public Switched Telephone Networks (PSTNs) in European
countries are technically somewhat different, due to historical reasons. The services being offered to the
end users also differ to a certain extent.
The increasing use of analogue terminals in the European networks, and especially terminals offering
non-voice services, such as modems and facsimile, is a measure of the need for such equipment seen by
European business companies. This type of equipment is undergoing constant and rapid development,
and it is therefore imperative that the delay in, and cost of, market introduction caused by the approval
procedures is the minimum possible. Otherwise, new innovative products may be available to Europe at
later dates than to other regions in the world. Also, countries in Europe where the market is comparatively
small may never benefit from these products, if the cost of market introduction is too high.
According to Directive 91/263/EEC, Terminal Equipment (TE) is required, among other things, to:
- not cause harm to the network - Article 4(d);
- be able to interwork with the network in order to set up, hold, modify, charge for and clear down a
connection - Article 4(f);
- interwork via the public telecommunications network, in justified cases - Article 4(g).
Although different, the networks have some basic commonalities. By restricting the requirements to cover
only the interworking that is essential for the establishment of a call to/from a terminal, the signalling
aspects can be simplified and harmonized.
This TBR specifies a harmonized set of requirements which will allow terminals, excluding voice telephony
terminals subject to Article 4(g) requirements, to be analogue connected to the existing European PSTNs.
It covers all relevant essential requirements in Directive 91/263/EEC. All safety requirements are covered
by the Low Voltage Directive (LVD) and therefore there are no requirements for Articles 4(a) and 4(b). All
ElectroMagnetic Compatibility (EMC) requirements are covered by the EMC Directive and therefore no
requirements for Articles 4(c) are included in this TBR. Article 4(e) is not applicable for a non-radio
system. Article 4(g) is not applicable for non-voice terminals.
This TBR specifies the connection arrangements (plug or socket, of the supplier’s choice) to be provided
by the terminal equipment. An adapter may be required between the terminal and the existing national
network termination point in individual countries. Such an adapter is outside the scope of this TBR.
The pan-European approval requirements for TE access to an analogue presented PSTN are related to
the network's capabilities. A single terminal may consume all of this (given) capability, or it can be shared
by a number of terminals all being connected to the Network Termination Point (NTP) in an arbitrary
combination of parallel and/or series connections. In this case the performance of each individual terminal
will need to be better than required by this TBR to ensure satisfactory interworking with the network.
Connection of terminal equipment in series and/or parallel is a national matter. Guidance on this subject
can be found in EG 201 120.

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1 Scope
This Technical Basis for Regulation (TBR) specifies the technical characteristics (electrical and
mechanical interface requirements and access control protocol) under Articles 4(d) and 4(f) of Directive
91/263/EEC to be provided by a single Terminal Equipment (TE) which is:
- intended for pan-European approval; and
- capable of 2-wire access to an analogue Public Switched Telephone Network (PSTN) line at the
Network Termination Point (NTP); but
- excluding TE which is capable of supporting the voice telephony justified case service as specified
in Article 4(g) of Directive 91/263/EEC.
The objective of this TBR is to ensure that no harm occurs to the public network, and to ensure
interworking between network and terminal so that calls can be routed successfully through the network,
but without any guarantee of terminal to terminal interoperability. There are no requirements in this TBR
under Article 4(g) of Directive 91/263/EEC.
This TBR covers TE which is capable of originating a circuit-switched call using Dual Tone Multi
Frequency (DTMF) signalling and/or receiving an incoming circuit-switched call. Other signalling methods
(e.g. loop disconnect signalling), if provided in the terminal and intended to be used in certain European
countries, are subject to appropriate national regulations in addition to this TBR, in respect of that feature.
Also, signalling for supplementary features (e.g. register recall, reception of metering pulses from the
network) if provided in the terminal, and intended to be used in certain European countries, are subject to
the appropriate national regulations.
For each requirement in this TBR a test is given, including measurement methods. Requirements apply at
that interface of the TE which connects directly (by galvanic means) to the PSTN via a network termination
point. The TE may be stimulated to perform the test by additional equipment if necessary.
This TBR specifies the connection arrangements (plug or socket, of the supplier's choice) to be provided
by the TE. An adapter may be required between the terminal and the existing national network termination
point in individual countries. Such an adapter is outside the scope of this TBR.
Where the origination or reception of calls by the TE is invoked, or otherwise controlled, by other
equipment external to the TE, the TE still needs to be capable of fulfilling the essential requirements under
Articles 4d) and 4f) at the interface to the public network. This TBR requires the manufacturer or supplier
of the TE to declare the conditions met by such external devices so that their use does not cause the TE
to fail to meet the essential requirements.
2 Normative references
This TBR 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 TBR only when incorporated in it by amendment or revision. For undated references the
latest edition of the publication referred to applies.
[1] Miniature 6-position plug as described in FCC 47, CFR 68.500: "Code of
Federal Regulations (USA); Title 47 Telecommunication; Chapter 1 Federal
Communications Commission, Part 68 Connection of Terminal Equipment to the
Telephone Network; Subpart F Connectors; Section 68.500 Specification".
NOTE: The above document can be obtained from:
Superintendent of Documents
Washington DC 20402
United States
Tel: + 1 202 512 18003

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[2] CCITT Recommendation G.117 (1990): "Transmission aspects of unbalance
about earth (definitions and methods)".
[3] ITU-T Recommendation G.100 (1993): "Definitions used in Recommendations
on general characteristics of international telephone connections and circuits".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this TBR, the following definitions apply:
3.1.1 General terms
automatic repeat call attempts: An automatic repeat call attempt made by the TE to the same network
address as the result of the failure of the previous call attempt and not as a result of an external stimulus
to the TE.
call attempt: The process by which the TE seizes the PSTN line and sends signalling characters of the
network address with which the TE wishes to communicate.
connection to earth: Connection to earth means that all the following points, as applicabl
...