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ETSI Standard
Speech and multimedia Transmission Quality (STQ);
Requirements and tests methods for terminal
equipment incorporating a handset when connected to the
analogue interface of the PSTN
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2 ETSI ES 203 038 V1.1.1 (2009-04)
Reference
DES/STQ-00129
Keywords
analogue, PSTN, telephony, terminal,
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© European Telecommunications Standards Institute 2009.
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3 ETSI ES 203 038 V1.1.1 (2009-04)
Contents
Intellectual Property Rights . 6
Foreword . 6
Introduction . 6
1 Scope . 7
2 References . 8
2.1 Normative references . 8
2.2 Informative references . 9
3 Definitions, symbols and abbreviations . 9
3.1 Definitions . 9
3.2 Symbols . 10
3.3 Abbreviations . 10
4 Speech transmission aspects . 10
4.1 General . 10
4.1.1 Polarity independence . 10
4.1.2 Feed conditions . 11
4.1.3 Power supply . 11
4.1.4 Volume control . 11
4.1.5 Test setup . 11
4.1.6 Environment for tests . 12
4.1.7 Accuracy of measurements and test equipment setting . 12
4.1.8 Order of tests. 12
4.1.9 Acoustic environment . 12
4.1.10 Alternative test methods . 13
4.1.11 Testing arrangements . 13
4.2 Speech performance characteristics. 16
4.2.1 Sensitivity/frequency response . 16
4.2.1.1 Sending Sensitivity . 16
4.2.1.2 Receiving Sensitivity . 17
4.2.2 Sending and Receiving Loudness Ratings (SLR and RLR) . 19
4.2.2.1 Sending Loudness Rating (SLR) . 19
4.2.2.2 Receiving Loudness Rating (RLR) . 19
4.2.3 Sidetone . 20
4.2.4 Distortion . 21
4.2.4.1 Sending distortion . 21
4.2.4.2 Receiving distortion . 22
4.2.5 Linearity (variation of gain with input level) . 23
4.2.5.1 Sending linearity . 23
4.2.5.2 Receiving linearity . 23
4.2.6 Noise . 23
4.2.6.1 Sending noise . 23
4.2.6.2 Receiving noise . 24
4.2.7 Acoustic shock . 24
4.2.7.1 Continuous signal . 24
4.2.7.2 Peak signal . 24
4.2.8 Instability . 25
4.2.9 Echo Return Loss (ERL) . 26
Annex A (normative): Requirements for LRGP measured terminals . 28
A.1 Speech transmission aspects . 28
A.1.1 General . 28
A.1.1.1 Polarity independence . 28
A.1.1.2 Feed conditions . 28
A.1.1.3 Power supply . 28
ETSI
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4 ETSI ES 203 038 V1.1.1 (2009-04)
A.1.1.4 Volume control . 28
A.2 Speech performance characteristics . 29
A.2.1 Sensitivity/frequency response . 29
A.2.1.1 Sending Sensitivity . 29
A.2.1.2 Receiving Sensitivity . 29
A.2.2 Sending and Receiving Loudness Ratings (SLR and RLR) . 30
A.2.2.1 Sending Loudness Rating (SLR) . 30
A.2.2.2 Receiving Loudness Rating (RLR) . 31
A.2.3 Sidetone . 31
A.2.4 Distortion . 31
A.2.4.1 Sending distortion . 31
A.2.4.2 Receiving distortion . 31
A.2.5 Linearity (variation of gain with input level) . 32
A.2.5.1 Sending linearity . 32
A.2.5.2 Receiving linearity . 32
A.2.6 Noise . 32
A.2.6.1 Sending noise . 32
A.2.6.2 Receiving noise . 32
A.2.7 Instability . 33
A.2.8 Echo Return Loss (ERL) . 33
Annex B (normative): Speech transmission compliance tests for LRGP measured terminals . 34
B.1 General conditions for testing . 34
B.1.1 Environment for tests . 34
B.1.2 Accuracy of measurements and test equipment setting . 34
B.1.3 Order of tests . 35
B.1.4 Acoustic environment . 35
B.1.5 Handset mounting. 35
B.1.6 Test levels . 35
B.1.6.1 Sending . 35
B.1.6.2 Receiving . 35
B.1.6.3 Sidetone . 35
B.1.7 Volume control . 35
B.1.8 Test equipment requirements . 36
B.1.9 Alternative test methods . 36
B.1.10 Testing arrangements . 36
B.2 Speech transmission performance tests for LRGP measured terminals . 39
B.2.1 Sensitivity/frequency response . 39
B.2.1.1 Sending sensitivity . 39
B.2.1.2 Receiving sensitivity . 39
B.2.2 Loudness ratings . 40
B.2.2.1 Sending loudness rating . 40
B.2.2.2 Receiving loudness rating . 40
B.2.3 Sidetone . 41
B.2.4 Distortion . 42
B.2.4.1 Sending distortion . 42
B.2.4.2 Receiving distortion . 43
B.2.5 Linearity (variation of gain with input level) . 43
B.2.5.1 Sending linearity . 43
B.2.5.2 Receiving linearity . 43
B.2.6 Noise . 44
B.2.6.1 Sending noise . 44
B.2.6.2 Receiving noise . 44
B.2.7 Instability . 45
B.2.8 Echo Return Loss (ERL) . 47
Annex C (informative): Table of changes relative to TBR 38 . 48
Annex D (informative): Bibliography . 51
ETSI
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5 ETSI ES 203 038 V1.1.1 (2009-04)
History . 52
ETSI
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6 ETSI ES 203 038 V1.1.1 (2009-04)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This ETSI Standard (ES) has been produced by ETSI Technical Committee Speech and multimedia Transmission
Quality (STQ).
The present document has been produced by ETSI in order to update the contents of initial standards for PSTN
(e.g. TBR 38 [15]).
In particular, the update aims to take benefits of recent improvements in test methods and test equipments. Even the
purpose of the standard is to consider Narrowband speech characteristics and test methods, the new test methods leave
the door open for further services (e.g. wideband speech).
In this release 1 of the present document, no new measurement will be added except limitation of acoustic shock which
is a requirement for safety. Previous requirements and test methods are kept in an annex in order to be used for
terminals designed with LRGP method. Status of this annex is planned to be informative, but only in release 2.
The new measurements needed for handset terminal including speech processing functions will be introduced in a
further release taking into account this type of terminal.
Introduction
The present document specifies only the technical characteristics for handset telephony and shall be used in conjunction
with an appropriate access standard.
ETSI
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7 ETSI ES 203 038 V1.1.1 (2009-04)
1 Scope
The present document specifies the technical characteristics (electrical and acoustic requirements and measurement
methods) to be provided by a single, handset telephony, terminal equipment which is intended 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.
The objective of the present documen is to ensure minimum speech quality when interworking via the public network
between two single items of equipment.
The present document only applies to terminal equipment supporting handset telephony.
The present document is applicable to handset telephony function. In the case of multiple functions provided in the
same terminal equipment, the present document does not apply when those other functions are active in conjunction
with handset telephony.
The present document also applies to any type of analogue handset terminal intended to be connected to a gateway.
The present document specifies the functions necessary to provide 2-way real-time speech conversation. Where a
function is indicated as optional, it needs not to be provided, but, where such a function is provided, the terminal needs
to conform to the requirements and tests specified in the present document.
A test is given for each requirement in the present document including measurement methods. The terminal equipment
may be stimulated to perform the tests by additional equipment if necessary.
The present document gives requirements for new test methods based upon use of HATS and new tests signals
In an annex, requirements with test methods corresponding to previous tests methods (LRGP) and test signals are given.
The application of the present document is intended also for handset telephony function employing a radio link
(e.g. DECT);
The application of the present document is not intended for:
• a handset telephony function with speech transmission performance specially designed for the less abled (e.g.
with amplification of received speech as an aid for the hard of hearing);
• a handset telephony function with speech transmission performance specifically designed to cater for hostile
environments;
• any handsfree or loudspeaking voice telephony function;
• a handset telephony function employing speech processing techniques other than coding.
NOTE: The terminal equipment may provide additional functions or facilities to those of handset telephony.
ETSI
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8 ETSI ES 203 038 V1.1.1 (2009-04)
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• Non-specific reference may be made only to a complete document or a part thereof and only in the following
cases:
- if it is accepted that it will be possible to use all future changes of the referenced document for the
purposes of the referring document;
- for informative references.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are indispensable for the application of the present document. For dated
references, only the edition cited applies. For non-specific references, the latest edition of the referenced document
(including any amendments) applies.
[1] ITU-T Recommendation G.122 (03/93): "Influence of national systems on stability and talker echo
in international connections".
[2] ITU-T Recommendation P.64 (11/07): "Determination of sensitivity/frequency characteristics of
local telephone systems".
[3] ITU-T Recommendation P.51 (08/96): "Artificial mouth".
[4] ITU-T Recommendation P.57 (11/05): "Artificial ears".
[5] IEC 651: "Sound level meters".
[6] ISO 3 (1973): "Preferred numbers - Series of preferred numbers".
[7] ITU-T Recommendation P.79 (11/07): "Calculation of loudness ratings for telephone sets". .
[8] ITU-T Recommendation O.41 (10/94): "Psophometer for use on telephone-type circuits".
[9] ETSI ES 200 677: "Public Switched Telephone Network (PSTN); Requirements for handset
telephony".
[10] ITU-T Recommendation P.50 (09/99): "Artificial voices".
[11] ITU-T Recommendation P.56 (03/93): " Objective measurement of active speech level".
[12] ITU-T Recommendation P 58 (08/96): "Head and torso simulator for telephony".
[13] ITU-T Recommendation P.501(09/01): "Test signals for use in telephonometry".
[14] ETSI EG 202 518: "Speech Processing, Transmission and Quality Aspects (STQ); Acoustic
Output of Terminal Equipment; Maximum Levels and Test Methodology for Various
Applications".
[15] ETSI TBR 38 (05/98): "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
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9 ETSI ES 203 038 V1.1.1 (2009-04)
2.2 Informative references
The following referenced documents are not essential to the use of the present document but they assist the user with
regard to a particular subject area. For non-specific references, the latest version of the referenced document (including
any amendments) applies.
[i.1] ITU-T Recommendation P 360 (07/06): "Efficiency of devices for preventing the occurrence of
excessive acoustic pressure by telephone receivers and assessment of daily noise exposure of
telephone users".
[i.2] ITU-TRecommendation P.35 (1988, Blue Book): "Handset telephones".
[i.3] ITU-T Recommendation P.65 (03/93): "Objective instrumentation for the determination of
loudness ratings".
[i.4] ETSI ES 202 738: "Speech Processing, Transmission and Quality Aspects (STQ); Transmission
requirements for narrowband VoIP loudspeaking and handsfree terminals from a QoS perspective
as perceived by the user".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
artificial ear: 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
diffuse field equalization: equalization of the HATS sound pick-up, equalization of the difference, in dB, between the
spectrum level of the acoustic pressure at the ear Drum Reference Point (DRP) and the spectrum level of the acoustic
pressure at the HATS Reference Point (HRP) in a diffuse sound field with the HATS absent (application of reverse
nominal curve of table 3 in ITU-T recommendation P.58 [12])
Echo Return Loss (ERL): return loss averaged with 1/f power weighting over the telephone band
(300 Hz to 3 400 Hz), in accordance with clause 4 of ITU-T Recommendation G.122 [1]
handset telephony: function provided by terminal equipme
...