ETSI TBR 038 ed.1 (1998-05)

Public Switched Telephone Network (PSTN); Attachment requirements for a terminal equipment incorporating an analogue handset function capable of supporting the justified case service when connected to the analogue interface of the PSTN in Europe

DTBR/ATA-004050

Javno komutirano telefonsko omrežje (PSTN) - Priključitvene zahteve za terminalsko opremo s funkcijo analogne pogovorke, ki lahko podpira storitev v upravičenem primeru, kadar je priključena na analogni vmesnik PSTN v Evropi

General Information

• Status: Published
• Publication Date: 05-May-1998
• Technical Committee: ATA - Analogue Terminals & Access
• Current Stage: 13 - TB decision to make document historical
• Due Date: 07-Apr-2008
• Completion Date: 07-Apr-2008
• Mandate: BC-T-333
• Ref Project: SIST TBR 038 E1:2004 - Public Switched Telephone Network (PSTN); Attachment requirements for a terminal equipment incorporating an analogue handset function capable of supporting the justified case service when connected to the analogue interface of the PSTN in Europe

Standards Content (Sample)

SLOVENSKI STANDARD
SIST TBR 038 E1:2004
01-oktober-2004
-DYQRNRPXWLUDQRWHOHIRQVNRRPUHåMH36713ULNOMXþLWYHQH]DKWHYH]D
WHUPLQDOVNRRSUHPRVIXQNFLMRDQDORJQHSRJRYRUNHNLODKNRSRGSLUDVWRULWHYY
XSUDYLþHQHPSULPHUXNDGDUMHSULNOMXþHQDQDDQDORJQLYPHVQLN3671Y(YURSL
Public Switched Telephone Network (PSTN); Attachment requirements for a terminal
equipment incorporating an analogue handset function capable of supporting the justified
case service when connected to the analogue interface of the PSTN in Europe
Ta slovenski standard je istoveten z: TBR 038 Edition 1
ICS:
33.040.35 Telefonska omrežja Telephone networks
SIST TBR 038 E1:2004 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST TBR 038 E1:2004

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SIST TBR 038 E1:2004
TECHNICAL TBR 38
BASIS for May 1998
REGULATION
Source: ATA Reference: DTBR/ATA-004050
ICS: 33.020
Key words: analogue, PSTN, telephony, terminal, type approval
Public Switched Telephone Network (PSTN);
Attachment requirements for a terminal equipment incorporating
an analogue handset function capable of supporting
the justified case service when connected
to the analogue interface of the PSTN in Europe
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
Internet: [e-mail] - http://www.etsi.fr - http://www.etsi.org
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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TBR 38: May 1998
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 .5
Introduction.5
1 Scope .7
2 Normative references.7
3 Definitions, symbols and abbreviations.8
3.1 Definitions .8
3.2 Symbols .9
3.3 Abbreviations .9
4 Speech transmission aspects .9
4.1 General .9
4.1.1 Polarity independence.9
4.1.2 Feed conditions .10
4.1.3 Power supply.10
4.1.4 Volume control .10
4.2 Speech performance characteristics .11
4.2.1 Sensitivity/frequency response.11
4.2.1.1 Sending Sensitivity.11
4.2.1.2 Receiving Sensitivity.12
4.2.2 Sending and Receiving Loudness Ratings (SLR and RLR).13
4.2.2.1 Sending Loudness Rating (SLR) .13
4.2.2.2 Receiving Loudness Rating (RLR) .13
4.2.3 Sidetone .14
4.2.4 Distortion .14
4.2.4.1 Sending distortion.14
4.2.4.2 Receiving distortion .15
4.2.5 Linearity (variation of gain with input level).15
4.2.5.1 Sending linearity .15
4.2.5.2 Receiving linearity.15
4.2.6 Noise .16
4.2.6.1 Sending noise.16
4.2.6.2 Receiving noise .16
4.2.7 Instability.17
4.2.8 Echo Return Loss (ERL) .17
Annex A (normative): Speech transmission compliance tests .18
A.1 General conditions for testing.18
A.1.1 Environment for tests.18
A.1.2 Accuracy of measurements and test equipment setting.18
A.1.3 Order of tests .18
A.1.4 Acoustic environment .19
A.1.5 Handset mounting.19
A.1.6 Test levels.19
A.1.6.1 Sending .19
A.1.6.2 Receiving.19
A.1.6.3 Sidetone .19
A.1.7 Volume control.19
A.1.8 Test equipment requirements.19
A.1.9 Alternative test methods .20
A.1.10 Testing arrangements.20

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TBR 38: May 1998
A.2 Speech transmission performance tests . 23
A.2.1 Sensitivity/frequency response. 23
A.2.1.1 Sending sensitivity . 23
A.2.1.2 Receiving sensitivity. 23
A.2.2 Loudness ratings. 24
A.2.2.1 Sending loudness rating . 24
A.2.2.2 Receiving loudness rating. 24
A.2.3 Sidetone . 25
A.2.4 Distortion . 26
A.2.4.1 Sending distortion . 26
A.2.4.2 Receiving distortion . 27
A.2.5 Linearity (variation of gain with input level). 27
A.2.5.1 Sending linearity . 27
A.2.5.2 Receiving linearity. 28
A.2.6 Noise . 28
A.2.6.1 Sending noise . 28
A.2.6.2 Receiving noise . 28
A.2.7 Instability. 29
A.2.8 Echo Return Loss (ERL) . 31
Annex B (normative): TBR Requirements Table (TBR-RT) . 32
B.1 TBR requirements table. 32
Annex C (informative): Information for test purposes.33
C.1 Introduction. 33
C.2 Guidance for the completion of the information required for test purposes. 33
C.2.1 Options. 33
C.2.2 General information. 33
Annex D (informative): Bibliography . 35
History. 36

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TBR 38: May 1998
Foreword
This Technical Basis for Regulation (TBR) has been produced by the ETSI Project Analogue Terminals
and Access (EP 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 relating to telecommunications terminal equipment and
satellite earth station equipment, including the mutual recognition of their conformity (Directive 98/13/EC).
A common technical regulation may be established by the European Commission in accordance with the
Directive.
Technical specifications relevant to the 98/13/EC Directive are given in the TBR-Requirements Table
(TBR-RT) in annex B.
Transposition dates
Date of adoption of this TBR: 01 May 1998
Date of latest announcement of this TBR (doa): 31 August 1998
Date of latest publication of new National Standard
or endorsement of this TBR (dop/e): 31 November 1998
Date of withdrawal of any conflicting National Standard (dow): 31 November 1999
Introduction
This TBR is written in response to an European Commission standardization mandate requesting a
harmonized standard for analogue voice terminals.
The scope of this TBR was laid down by ACTE and the requirements are based on I-ETS 300 677 (Public
Switched Telephone Network (PSTN); Requirements for handset telephony), and on I-ETS 300 480
(Public Switched Telephone Network (PSTN); Testing specification for analogue handset telephony).
This TBR specifies only the technical characteristics for handset telephony and shall be used in
conjunction with an appropriate access standard.

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TBR 38: May 1998
1 Scope
This Technical Basis for Regulation (TBR) specifies the technical characteristics (electrical and acoustic
requirements) under Article 5(g) of Directive 98/13/EC to be provided by a single, handset telephony,
terminal equipment which is intended:
a) for pan-European approval; and
b) for connection by 2 wires to an analogue interface of a PSTN. This interface is characterized by a
d.c. loop to indicate seizure and clearing, low frequency a.c. ringing signals below the speech
passband to indicate an incoming call and the transmission phase having an approximate
bandwidth of 3 kHz at the network terminating point; and
c) for supporting the voice telephony justified case service.
The objective of this TBR is to ensure minimum speech quality when interworking via the public network
between two single items of equipment.
This TBR only applies to terminal equipment supporting handset telephony.
This TBR is applicable to handset telephony function. In the case of multiple functions provided in the
same terminal equipment, this TBR does not apply when those other functions are active in conjunction
with handset telephony.
This TBR specifies the functions necessary to provide 2-way real-time speech conversation. Where a
function is indicated as optional, it need not be provided, but, where such a function is provided, the
terminal needs to conform to the requirements and test specified in this TBR.
A test is given for each requirement in this TBR including measurement methods. The terminal equipment
may be stimulated to perform the tests by additional equipment if necessary.
The application of this TBR is not mandatory for:
a) a handset telephony function with speech transmission performance specially designed for
the disabled (e.g. with amplification of received speech as an aid for the hard of hearing);
b) a handset telephony function employing a radio link (e.g. cordless telephones);
c) a handset telephony function with speech transmission performance specifically designed to
cater for hostile environments;
d) any handsfree or loudspeaking voice telephony function;
e) a handset telephony function employing non-linear or time variant techniques for the
processing of the signal.
NOTE: The terminal equipment may provide additional functions or facilities to that of handset
telephony.

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TBR 38: May 1998
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] ITU-T Recommendation G.122 (03/93): "Influence of national systems on
stability and talker echo in international connections".
[2] I-ETS 300 480: "Public Switched Telephone Network (PSTN); Testing
specification for analogue handset telephony".
[3] ITU-T Recommendation P.64 (04/97): "Determination of sensitivity/frequency
characteristics of local telephone systems".
[4] ITU-T Recommendation P.51 (08/96): "Artificial mouth".
[5] ITU-T Recommendation P.57 (0896): "Artificial ears".
[6] IEC 651: "Sound level meters".
[7] ISO 3 (1973): "Preferred numbers - Series of preferred numbers".
[8] ITU-T Recommendation P.79 (03/93): "Calculation of loudness ratings for
telephone sets".
[9] ITU-T Recommendation O.41 (10/94): "Psophometer for use on telephone-type
circuits".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of this TBR, the following definitions apply:
artificial ear: A device for the calibration of earphones incorporating an acoustic coupler and a calibrated
microphone for the measurement of sound pressure and having an overall acoustic impedance similar to
that of the average human ear over a given frequency band.
Echo Return Loss (ERL): Return loss averaged with 1/f power weighting over the telephone band
(300 Hz - 3 400 Hz), in accordance with clause 4 of ITU-T Recommendation G.122 [1].
handset: A combination of telephone microphone and receiver in a form convenient for holding
simultaneously to mouth and ear, which, when in use, retains the microphone in a position fixed in relation
to the receiver.
handset telephony: A function provided by terminal equipment whereby two-way real-time speech is
supported by means of a handset that forms an integral part of the terminal equipment. The term "live
speech" is also frequently used to describe "real-time speech". For the purposes of this TBR, they should
be considered as having the same meaning.
handsfree function: A function whereby telephony transmission and reception is facilitated by the use of
microphone(s) and loudspeaker(s) placed at a distance from the user. No handset is required to be used
and normally the handset is not active.
loop state: The state where the TE draws sufficient DC current to activate the exchange.
loop steady state: A loop state excluding the transitions from and to quiescent state.

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TBR 38: May 1998
loudness rating: A measure, expressed in decibels, for characterizing the loudness performance of
complete telephone connections or of parts thereof such as sending system, line, receiving system.
loudspeaking function: A function of a handset telephone using a loudspeaker associated with an
amplifier as a telephone receiver.
Mouth Reference Point (MRP): A point 25 mm in front of and on the axis of the lip position of a typical
human mouth (or artificial mouth).
nominal setting: A setting of the volume control where the RLR is as close as possible to -8 dB.
3.2 Symbols
For the purposes of this TBR, the following symbols apply:
WOhm
dB decibel
dBPa sound pressure level with respect to 1 Pa, expressed in dB
dBPa(A) "A" weighted sound pressure level with respect to 1 Pa, expressed in dB
dBV voltage level with respect to 1 V, expressed in dB
dBVp psophometrically weighted voltage level with respect to 1 V, expressed in dB
Pa Pascal
SPL Sound Pressure Level
V Volt
3.3 Abbreviations
For the purposes of this TBR, the following abbreviations apply:
a.c. alternating current
d.c. direct current
e.m.f. electromotive force
ERL Echo Return Loss
ERP Ear Reference Point
ITU-T International Telecommunications Union -Telecommunications sector
LRGP Loudness Rating Guard-ring Position
MRP Mouth Reference Point
PSTN Public Switched Telephone Network
r.m.s. root mean square
RL Return Loss
RLR Receiving Loudness Rating
SLR Sending Loudness Rating
STMR SideTone Masking Rating
TBR-RT Technical Basis for Regulation - Requirements Table
TE Terminal Equipment
4 Speech transmission aspects
4.1 General
4.1.1 Polarity independence
Reference: I-ETS 300 677, subclause 4.1.1.
Requirement: The TE shall conform to the requirements of this TBR for both polarities of line feeding
voltage.
Justification: 98/13/EC, Article 5(g).
Interworking of terminal equipment via the public telecommunications network requires the TE to provide
adequate speech performance with both feed polarities, since a fixed polarity is not guaranteed by the
PSTN.

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Test: Compliance shall be demonstrated by reversal of the d.c. voltage applied to the line terminals from
test to test or between changes of test configuration when performing the tests of annex A.
4.1.2 Feed conditions
Reference: I-ETS 300 677, subclause 4.1.2.
Requirement: The TE shall conform to the requirements of this TBR when tested with a supply voltage of
50 V and with feed resistances ranging from 500 W to 2 800 W.
NOTE: Some requirements are only specified for single or specific values of feed resistance.
Justification: 98/13/EC, Article 5(g).
Interworking of terminal equipment via the public telecommunications network requires the TE to provide
adequate speech performance over the range of feed conditions occurring in the loop steady state when
connected to the PSTN.
Test: Compliance shall be demonstrated by performing the tests of annex A with the feed resistances
specified in subclause 4.2 which are chosen from those permitted by I-ETS 300 480 [2].
4.1.3 Power supply
Reference: I-ETS 300 677, subclause 4.1.3.
Requirement: Where the terminal handset function is intended to be used with power additional to that
derived from the network, the requirements of subclause 4.2 shall apply only when such additional power
is provided and operating within specification.
Justification: 98/13/EC, Article 5(g).
Interworking of terminal equipment via the public telecommunications network requires any TE which
needs a source of external power for its speech functions to have adequate speech performance when its
power supply is connected and operative.
Test: Compliance shall be demonstrated by performing the tests of annex A with the power supply
connected and operative.
4.1.4 Volume control
Reference: I-ETS 300 677, subclause 4.1.4.
Requirement: For TE with a user-controlled receiving volume control, the speech performance
characteristics requirements apply with the user-controlled receiving volume control at the setting where
the RLR is as close as possible to -8 dB, unless stated otherwise. This setting is to be taken as the
nominal setting of the volume control.
Justification: 98/13/EC, Article 5(g).
Interworking of terminal equipment via the public telecommunications network requires the TE to provide
adequate speech performance for at least one setting of the volume control.
Test: Compliance tests of annex A shall be carried out at the setting of the volume control where the RLR
is as close as possible to -8 dB when measured with the feed resistance R set to 1 000 W, unless
f
otherwise specified in the appropriate requirement.
NOTE: It is not necessary to strive to achieve values closer than 1 dB.

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TBR 38: May 1998
4.2 Speech performance characteristics
4.2.1 Sensitivity/frequency response
4.2.1.1 Sending Sensitivity
Reference: I-ETS 300 677, subclause 4.2.1.1.
Requirement: The sending sensitivity when measured according to ITU-T Recommendation P.64 [3] with
a load of 600 W, as a function of frequency, shall be not greater than the upper limit and not less than the
lower limit given in table 1 and shown in figure 1.
Justification: 98/13/EC, Article 5(g).
Interworking of terminal equipment via the public telecommunications network requires the TE to have a
sensitivity/frequency response compatible with the network and with other telephones connected to the
network so as to be capable of providing adequate speech performance.
Test: Compliance shall be checked by the test described in subclause A.2.1.1 when measured with the
feed resistance R set to 1 000 W.
f
Table 1: Co-ordinates of sending sensitivity limit curves
Frequency (Hz) dB relative to arbitrary level
Upper limit 100 -9
2 000 +4
4 000 +4
8 000 -13
Lower limit 300 -14
2 000 -6
3 400 -11
5
0
Sensitivity
dB rel.
arbitrary zero
-5
-10
-15
100 500 1 000 2 000 5 000 10 000
200
Frequency (Hz)
Figure 1: Sending sensitivity/frequency limits

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TBR 38: May 1998
4.2.1.2 Receiving Sensitivity
Reference: I-ETS 300 677, subclause 4.2.1.2.
Requirement: The receiving sensitivity when measured according to ITU-T Recommendation P.64 [3], as
a function of frequency, shall be not greater than the upper limit and not less than the lower limit given in
table 2 and shown in figure 2.
Additionally, the sensitivity at 8 kHz shall be at least 20 dB below the sensitivity at 1 kHz.
Justification: 98/13/EC, Article 5(g).
Interworking of terminal equipment via the public telecommunications network requires the TE to have a
sensitivity/frequency response compatible with the network and with other telephones connected to the
network so as to be capable of providing adequate speech performance.
Test: Compliance shall be checked by the test described in subclause A.2.1.2 when measured with the
feed resistance R set to 1 000 W.
f
Table 2: Co-ordinates of receiving sensitivity limit curves
Frequency (Hz) dB relative to arbitrary level
Upper limit 100 -10
200 +2
4 000 +2
8 000 -15
Lower limit 300 -9
1 000 -7
3 400 -12
5
0
Sensitivity
dB rel.
arbitrary zero
-5
-10
-15
100 500 1 000 2 000 5 000 10 000
200
Frequency (Hz)
Figure 2: Receiving sensitivity/frequency limits

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4.2.2 Sending and Receiving Loudness Ratings (SLR and RLR)
4.2.2.1 Sending Loudness Rating (SLR)
Reference: I-ETS 300 677, subclause 4.2.2.1.
Requirement: The Sending Loudness Rating (SLR) shall be +3 dB – 4 dB when measured with the feed
resistance R set to 2 800 W and 1 000 W and +3 dB + 7/- 4 dB when measured with the feed resistance
f
R set to 500 W.
f
For terminal equipment supporting handsfree or loudspeaking functions which is not powered from a
separate power supply, the requirement to measure with R set to 2 800 W shall be replaced by a
f
requirement to measure with R set to 2 300 W.
f
NOTE: In some countries, lines are in use which provide less current than that provided by this
test. When connected to such lines, TEs with handsfree or loudspeaking functions
may not operate correctly.
Justification: 98/13/EC, Article 5(g).
Interworking of terminal equipment via the public telecommunications network requires the TE to have a
SLR compatible with other telephones connected to the network so as to be capable of providing
adequate speech performance. It is also essential that the terminal performance permits a network
transmission plan capable of meeting ITU-T Recommendations at the international boundary.
Test: Compliance shall be checked by the test described in subclause A.2.2.1.
4.2.2.2 Receiving Loudness Rating (RLR)
Reference: I-ETS 300 677, subclause 4.2.2.2.
Requirement: The Receiving Loudness Rating (RLR) shall be -8 dB – 4 dB when measured with the feed
resistance R set to 2 800 W and 1 000 W and -8 dB + 7/- 4 dB when measured with the feed resistance R
f f
set to 500 W.
For terminal equipment supporting handsfree or loudspeaking functions which is not powered from a
separate power supply, the requirement to measure with R set to 2 800 W shall be replaced by a
f
requirement to measure with R set to 2 300 W.
f
NOTE: In some countries, lines are in use which provide less current than that provided by this
test. When connected to such lines, TEs with handsfree or loudspeaking functions
may not operate correctly.
Justification: 98/13/EC, Article 5(g).
Interworking of terminal equipment via the public telecommunications network requires the TE to have a
RLR compatible with other telephones connected to the network so as to be capable of providing
adequate speech performance. It is also essential that the terminal performance permits a network
transmission plan capable of meeting ITU-T Recommendations at the international boundary.
Test: Compliance shall be checked by the test described in subclause A.2.2.2.

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4.2.3 Sidetone
Reference: I-ETS 300 677, subclause 4.2.3.
Requirement: When measured by the test described in subclause A.2.3, the SideTone Masking Rating
(
...