European digital cellular telecommunications system (Phase 2); Attachment requirements for Global System for Mobile communications (GSM) mobile stations; Telephony

This Technical Basis for Regulation (TBR) specifies the technical requirements to be met by terminal equipment capable of connecting to a public telecommunications network. These requirements apply to terminals for Phase 2 of the public land mobile radio service, operating in the 900 MHz band with a channel separation of 200 kHz, utilising constant envelope modulation and carrying traffic channels according to the Time Division Multiple Access (TDMA) principle. This TBR specifies the requirements for GSM Telephony (speech) for the GSM900 version of the Global System for Mobile communications (GSM). For each test purpose and its corresponding conformance requirement, a reference is given to ETS 300 607-1 (GSM 11.10-1) [2]. The requirements apply to speech transmission. The measurement uncertainty is handled, as described in ETS 300 607-1 (GSM 11.10-1) [2]. This TBR covers the essential requirements of the Terminal Directive 91/263/EEC [1] Article 4g. Articles 4d, 4e, and 4f are covered by TBR 19. The Terminal Directive 91/263/EEC Articles 4a and 4b are covered by other directives, and, therefore, not by this TBR. In this TBR, there are no Electromagnetic Compatibility technical requirements in terms of the Terminal Directive 91/263/EEC, Article 4c. NOTE: Technical Requirements for EMC performance and testing of the equipment are covered by the relevant standards applicable to the EMC Directive 89/336/EEC, Annex A. Terminal equipment may be subject to additional requirements in other Common Technical Regulations (CTR) depending on the equipments functionality. ETS 300 607-1 (GSM 11.10-1) [2] constitutes the conformance test suite for GSM. The verification of the conformance requirements in this TBR is based on the tests described in this ref rence. The set of requirements in ETS 300 607-1 (GSM 11.10-1) [2] and the set of requirements in this TBR need not be identical. Some requirements only apply to specific types of mobile station (e.g. data tests only apply to mobil

Evropski digitalni celični telekomunikacijski sistem (faza 2) - Priključitvene zahteve mobilnih postaj sistema GSM (globalni sistem mobilnih komunikacij) - Telefonija

General Information

Status
Published
Publication Date
31-May-2000
Withdrawal Date
30-Sep-2003
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Jun-2000
Due Date
01-Jun-2000
Completion Date
01-Jun-2000
Mandate

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SLOVENSKI STANDARD
SIST TBR 020:2000
01-junij-2000

(YURSVNLGLJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHP ID]D 3ULNOMXþLWYHQH]DKWHYH

PRELOQLKSRVWDMVLVWHPD*60 JOREDOQLVLVWHPPRELOQLKNRPXQLNDFLM 7HOHIRQLMD
European digital cellular telecommunications system (Phase 2); Attachment
requirements for Global System for Mobile communications (GSM) mobile stations;
Telephony
Ta slovenski standard je istoveten z: TBR 020 Edition 3
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
SIST TBR 020:2000 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST TBR 020:2000
---------------------- Page: 2 ----------------------
SIST TBR 020:2000
TECHNICAL TBR 20
BASIS for September 1997
REGULATION Third Edition
Source: ETSI SMG Reference: RTBR/SMG-0720TTCNR
ICS: 33.020

Key words: European digital cellular telecommunications system, Global System for Mobile communications

(GSM)
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
European digital cellular telecommunications system (Phase 2);
Attachment requirements for Global System for Mobile
communications (GSM) mobile stations;
Telephony
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.
---------------------- Page: 3 ----------------------
SIST TBR 020:2000
Page 2
TBR 20: September 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.

---------------------- Page: 4 ----------------------
SIST TBR 020:2000
Page 3
TBR 20: September 1997
Contents

Foreword .......................................................................................................................................................5

1 Scope ..................................................................................................................................................7

2 Normative references..........................................................................................................................8

3 Abbreviations.......................................................................................................................................8

4 Requirements......................................................................................................................................8

Annex A (normative): The TBR Requirement Table (TBR-RT).............................................................12

A.1 Introduction to the TBR-RT ...............................................................................................................12

A.2 Format of the tables ..........................................................................................................................12

A.3 References to ETS 300 607-1 (GSM 11.10-1)..................................................................................13

A.4 Notations used in the TBR-RT ..........................................................................................................14

A.4.1 Status Notations.................................................................................................................14

A.4.2 Support Answer Notations .................................................................................................14

A.5 The TBR Requirement Tables ..........................................................................................................14

A.5.1 Static Requirements, TBR-RT A........................................................................................14

A.5.2 Dynamic Requirements, TBR-RT B...................................................................................15

History..........................................................................................................................................................16

---------------------- Page: 5 ----------------------
SIST TBR 020:2000
Page 4
TBR 20: September 1997
Blank page
---------------------- Page: 6 ----------------------
SIST TBR 020:2000
Page 5
TBR 20: September 1997
Foreword

This Technical Basis for Regulation (TBR) has been produced by the Special Mobile Group (SMG) of the

European Telecommunications Standards Institute (ETSI).
This TBR covers the requirements for GSM Telephony (speech).

This TBR contains the procedures and requirements for the approval testing of GSM terminal equipment

for speech.
The requirements of other TBRs apply in addition to this TBR.

For each test, supplementary information is provided, giving a justification why this item has been selected

for regulatory testing, and a reference to the relevant article of the Terminal Directive [1].

This TBR is based on the ETS 300 607-1 (GSM 11.10-1 version 4.18.0) [2].

This TBR 20 corresponds to SMG TBR 20 version 4.0.2 and is a result of further work within SMG.

NOTE: This TBR for Phase 2 may be developed in stages. The first release will include, as a

minimum, all of the basic Phase 2 requirements for full rate and primary band.
Subsequent releases will include additional requirements.
---------------------- Page: 7 ----------------------
SIST TBR 020:2000
Page 6
TBR 20: September 1997
Blank page
---------------------- Page: 8 ----------------------
SIST TBR 020:2000
Page 7
TBR 20: September 1997
1 Scope

This Technical Basis for Regulation (TBR) specifies the technical requirements to be met by terminal

equipment capable of connecting to a public telecommunications network. These requirements apply to

terminals for Phase 2 of the public land mobile radio service, operating in the 900 MHz band with a

channel separation of 200 kHz, utilizing constant envelope modulation and carrying traffic channels

according to the Time Division Multiple Access (TDMA) principle.

This TBR specifies the requirements for GSM Telephony (speech) for the GSM900 version of the Global

System for Mobile communications (GSM).

For each test purpose and its corresponding conformance requirement, a reference is given to

ETS 300 607-1 (GSM 11.10-1) [2]. The requirements apply to speech transmission.

The measurement uncertainty is handled, as described in ETS 300 607-1 (GSM 11.10-1) [2].

This TBR covers the essential requirements of the Terminal Directive 91/263/EEC [1] Article 4g.

Articles 4d, 4e, and 4f are covered by TBR 19 [3].

The Terminal Directive 91/263/EEC Articles 4a and 4b are covered by other directives, and, therefore, not

by this TBR.

In this TBR, there are no Electromagnetic Compatibility technical requirements in terms of the Terminal

Directive 91/263/EEC, Article 4c.

NOTE 1: Technical Requirements for EMC performance and testing of the equipment are

covered by the relevant standards applicable to the EMC Directive 89/336/EEC,
annex A.

Terminal equipment may be subject to additional requirements in other Common Technical Regulations

(CTR) depending on the equipments functionality.

ETS 300 607-1 (GSM 11.10-1) [2] constitutes the conformance test suite for GSM. The verification of the

conformance requirements in this TBR is based on the tests described in this reference. The set of

requirements in ETS 300 607-1 (GSM 11.10-1) [2] and the set of requirements in this TBR need not be

identical.

Some requirements only apply to specific types of mobile station (e.g. data tests only apply to mobile

stations with a data facility). The TBR also indicates the specific test which shall be carried out for each

mobile station type.

An active accessory is covered by this TBR if it modifies the terminal performance in an aspect which

affects conformance to essential requirements.

NOTE 2: Only active devices are subject to this TBR. Accessories may be tested with specific

terminals, and either approved for use with those terminals only, or may possibly be

approved for use with a wider range of terminals, depending on the nature and effect

of the accessory.
---------------------- Page: 9 ----------------------
SIST TBR 020:2000
Page 8
TBR 20: September 1997
2 Normative references

This TBR incorporates, by dated or 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 revision of any of these publications apply

to the requirements specified in this TBR, only when incorporated in it by amendment or revision. For

undated references the latest edition of the publication referred to applies.
[1] Terminal Directive 91/263/EEC: "Council directive of 29 April 1991 on the
approximation of the laws of the Member States concerning telecommunications
terminal equipment, including the mutual recognition of their conformity. ("The
Terminal Directive")".
[2] ETS 300 607-1 (GSM 11.10-1 version 4.18.0): "Digital cellular
telecommunications system (Phase 2); Mobile station conformity specifications".
[3] TBR 19 Edition 4: " European digital cellular telecommunications system
(Phase 2); Attachment requirements for Global System for Mobile
communications (GSM) mobile stations; Access".
[4] ETS 300 540 (GSM 03.50 version 4.2.0): "Digital cellular telecommunications
system (Phase 2); Transmission planning aspects of the speech service in the
GSM Public Land Mobile Network (PLMN) system".
[5] ETS 300 504 Edition 3 (GSM 02.06 version 4.4.0): "Digital cellular
telecommunications system (Phase 2); Types of Mobile Stations (MS)".
3 Abbreviations
For the purposes of this TBR, the following abbreviations apply:
CTR Common Technical Regulations
DTX Discontinuous Transmission (mechanism)
EL Echo Loss
MMI Man Machine Interface
MS GSM Mobile Station
TCH Traffic CHannel
TCH/FS Full rate Traffic CHannel for Speech
TCH/HS Half rate Traffic CHannel for Speech
TDMA Time Division Multiple Access
4 Requirements

The following table contains all requirements that are needed to meet the essential requirements as

defined in the Terminal Directive [1]. A justification according to article 4 of the Terminal Directive [1] is

given by stating the relevant category (g) together with a text supporting the justification.

The entries are defined as follows:

- "ETS 300 607-1 Item" defines the item number of the conformance requirement and also the

reference to ETS 300 607-1 (GSM 11.10-1) [2]. This reference is a normative reference to a

subclause of ETS 300 607-1 (GSM 11.10-1) [2] containing the conformance requirement text, and

references to the base standard.
- "Description" contains a short description of the requirement.

- "TBR Justification" contains supplementary information to explain the justification of the requirement

according to article 4 of the Terminal Directive [1].

- "TD Cat" defines the category according to article 4 of the Terminal Directive [1].

---------------------- Page: 10 ----------------------
SIST TBR 020:2000
Page 9
TBR 20: September 1997

- "Test Cat" defines whether the requirement is covered by a "special test situation" (e.g. a

manufacturer’s declaration of some form). An "X" indicates a special test situation, whilst, a blank

entry indicates conformity is by the test referred to by this TBR.
Table 1: Requirements and Justifications
ETS 300 607-1 Description TBR Justification TD Cat Test
Item Cat
14.4.3 Co channel rejection - Non compliance in this area may
TCH/HS (SID frames) impair speech quality.
30.1 Sending sensitivity / If this requirement is not met, the MS g
frequency response will not be able to produce a
reasonable speech intelligibility.
30.2 Sending loudness rating If this requirement is not met, the MS g
will not be able to produce a
reasonable speech intelligibility.
30.3 Receiving sensitivity / If this requirement is not met, the MS g
frequency response will not be able to produce a
reasonable speech intelligibility.
30.4 Receiving loudness rating If this requirement is not met, the MS g
will not be able to produce a
reasonable speech intelligibility.
30.5.1 Side Tone Masking Rating If this requirement is not met, the MS g
(STMR) will not be able to produce a
reasonable speech intelligibility.
30.5.2 Listener Side Tone Rating If this requirement is not met, the MS g X
(LSTR) will not be able to produce a
reasonable speech intelligibility.
30.6.1 Telephone acoustic coupling If this requirement is not met, the MS g
loss (TAL) - Echo loss (EL) will not be able to produce a
reasonable speech intelligibility.
30.6.2 Telephone acoustic coupling If this requirement is not met, the MS g
loss (TAL) - Stability margin will not be able to produce a
reasonable speech intelligibility.
30.7.1 Distortion - Sending If this requirement is not met, the MS g
will not
...

SLOVENSKI STANDARD
3SIST TBR 020:2000
01-MDQXDU-2000

(YURSVNLGLJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHP ID]D 3ULNOMXþLWYHQH]DKWHYH

PRELOQLKSRVWDMVLVWHPD*60 JOREDOQLVLVWHPPRELOQLKNRPXQLNDFLM 7HOHIRQLMD
European digital cellular telecommunications system (Phase 2); Attachment
requirements for Global System for Mobile communications (GSM) mobile stations;
Telephony
Ta slovenski standard je istoveten z: TBR 020 Edition 3
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
3SIST TBR 020:2000 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST TBR 020:2000
---------------------- Page: 2 ----------------------
SIST TBR 020:2000
TECHNICAL TBR 20
BASIS for September 1997
REGULATION Third Edition
Source: ETSI SMG Reference: RTBR/SMG-0720TTCNR
ICS: 33.020

Key words: European digital cellular telecommunications system, Global System for Mobile communications

(GSM)
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
European digital cellular telecommunications system (Phase 2);
Attachment requirements for Global System for Mobile
communications (GSM) mobile stations;
Telephony
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.
---------------------- Page: 3 ----------------------
SIST TBR 020:2000
Page 2
TBR 20: September 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.

---------------------- Page: 4 ----------------------
SIST TBR 020:2000
Page 3
TBR 20: September 1997
Contents

Foreword .......................................................................................................................................................5

1 Scope ..................................................................................................................................................7

2 Normative references..........................................................................................................................8

3 Abbreviations.......................................................................................................................................8

4 Requirements......................................................................................................................................8

Annex A (normative): The TBR Requirement Table (TBR-RT).............................................................12

A.1 Introduction to the TBR-RT ...............................................................................................................12

A.2 Format of the tables ..........................................................................................................................12

A.3 References to ETS 300 607-1 (GSM 11.10-1)..................................................................................13

A.4 Notations used in the TBR-RT ..........................................................................................................14

A.4.1 Status Notations.................................................................................................................14

A.4.2 Support Answer Notations .................................................................................................14

A.5 The TBR Requirement Tables ..........................................................................................................14

A.5.1 Static Requirements, TBR-RT A........................................................................................14

A.5.2 Dynamic Requirements, TBR-RT B...................................................................................15

History..........................................................................................................................................................16

---------------------- Page: 5 ----------------------
SIST TBR 020:2000
Page 4
TBR 20: September 1997
Blank page
---------------------- Page: 6 ----------------------
SIST TBR 020:2000
Page 5
TBR 20: September 1997
Foreword

This Technical Basis for Regulation (TBR) has been produced by the Special Mobile Group (SMG) of the

European Telecommunications Standards Institute (ETSI).
This TBR covers the requirements for GSM Telephony (speech).

This TBR contains the procedures and requirements for the approval testing of GSM terminal equipment

for speech.
The requirements of other TBRs apply in addition to this TBR.

For each test, supplementary information is provided, giving a justification why this item has been selected

for regulatory testing, and a reference to the relevant article of the Terminal Directive [1].

This TBR is based on the ETS 300 607-1 (GSM 11.10-1 version 4.18.0) [2].

This TBR 20 corresponds to SMG TBR 20 version 4.0.2 and is a result of further work within SMG.

NOTE: This TBR for Phase 2 may be developed in stages. The first release will include, as a

minimum, all of the basic Phase 2 requirements for full rate and primary band.
Subsequent releases will include additional requirements.
---------------------- Page: 7 ----------------------
SIST TBR 020:2000
Page 6
TBR 20: September 1997
Blank page
---------------------- Page: 8 ----------------------
SIST TBR 020:2000
Page 7
TBR 20: September 1997
1 Scope

This Technical Basis for Regulation (TBR) specifies the technical requirements to be met by terminal

equipment capable of connecting to a public telecommunications network. These requirements apply to

terminals for Phase 2 of the public land mobile radio service, operating in the 900 MHz band with a

channel separation of 200 kHz, utilizing constant envelope modulation and carrying traffic channels

according to the Time Division Multiple Access (TDMA) principle.

This TBR specifies the requirements for GSM Telephony (speech) for the GSM900 version of the Global

System for Mobile communications (GSM).

For each test purpose and its corresponding conformance requirement, a reference is given to

ETS 300 607-1 (GSM 11.10-1) [2]. The requirements apply to speech transmission.

The measurement uncertainty is handled, as described in ETS 300 607-1 (GSM 11.10-1) [2].

This TBR covers the essential requirements of the Terminal Directive 91/263/EEC [1] Article 4g.

Articles 4d, 4e, and 4f are covered by TBR 19 [3].

The Terminal Directive 91/263/EEC Articles 4a and 4b are covered by other directives, and, therefore, not

by this TBR.

In this TBR, there are no Electromagnetic Compatibility technical requirements in terms of the Terminal

Directive 91/263/EEC, Article 4c.

NOTE 1: Technical Requirements for EMC performance and testing of the equipment are

covered by the relevant standards applicable to the EMC Directive 89/336/EEC,
annex A.

Terminal equipment may be subject to additional requirements in other Common Technical Regulations

(CTR) depending on the equipments functionality.

ETS 300 607-1 (GSM 11.10-1) [2] constitutes the conformance test suite for GSM. The verification of the

conformance requirements in this TBR is based on the tests described in this reference. The set of

requirements in ETS 300 607-1 (GSM 11.10-1) [2] and the set of requirements in this TBR need not be

identical.

Some requirements only apply to specific types of mobile station (e.g. data tests only apply to mobile

stations with a data facility). The TBR also indicates the specific test which shall be carried out for each

mobile station type.

An active accessory is covered by this TBR if it modifies the terminal performance in an aspect which

affects conformance to essential requirements.

NOTE 2: Only active devices are subject to this TBR. Accessories may be tested with specific

terminals, and either approved for use with those terminals only, or may possibly be

approved for use with a wider range of terminals, depending on the nature and effect

of the accessory.
---------------------- Page: 9 ----------------------
SIST TBR 020:2000
Page 8
TBR 20: September 1997
2 Normative references

This TBR incorporates, by dated or 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 revision of any of these publications apply

to the requirements specified in this TBR, only when incorporated in it by amendment or revision. For

undated references the latest edition of the publication referred to applies.
[1] Terminal Directive 91/263/EEC: "Council directive of 29 April 1991 on the
approximation of the laws of the Member States concerning telecommunications
terminal equipment, including the mutual recognition of their conformity. ("The
Terminal Directive")".
[2] ETS 300 607-1 (GSM 11.10-1 version 4.18.0): "Digital cellular
telecommunications system (Phase 2); Mobile station conformity specifications".
[3] TBR 19 Edition 4: " European digital cellular telecommunications system
(Phase 2); Attachment requirements for Global System for Mobile
communications (GSM) mobile stations; Access".
[4] ETS 300 540 (GSM 03.50 version 4.2.0): "Digital cellular telecommunications
system (Phase 2); Transmission planning aspects of the speech service in the
GSM Public Land Mobile Network (PLMN) system".
[5] ETS 300 504 Edition 3 (GSM 02.06 version 4.4.0): "Digital cellular
telecommunications system (Phase 2); Types of Mobile Stations (MS)".
3 Abbreviations
For the purposes of this TBR, the following abbreviations apply:
CTR Common Technical Regulations
DTX Discontinuous Transmission (mechanism)
EL Echo Loss
MMI Man Machine Interface
MS GSM Mobile Station
TCH Traffic CHannel
TCH/FS Full rate Traffic CHannel for Speech
TCH/HS Half rate Traffic CHannel for Speech
TDMA Time Division Multiple Access
4 Requirements

The following table contains all requirements that are needed to meet the essential requirements as

defined in the Terminal Directive [1]. A justification according to article 4 of the Terminal Directive [1] is

given by stating the relevant category (g) together with a text supporting the justification.

The entries are defined as follows:

- "ETS 300 607-1 Item" defines the item number of the conformance requirement and also the

reference to ETS 300 607-1 (GSM 11.10-1) [2]. This reference is a normative reference to a

subclause of ETS 300 607-1 (GSM 11.10-1) [2] containing the conformance requirement text, and

references to the base standard.
- "Description" contains a short description of the requirement.

- "TBR Justification" contains supplementary information to explain the justification of the requirement

according to article 4 of the Terminal Directive [1].

- "TD Cat" defines the category according to article 4 of the Terminal Directive [1].

---------------------- Page: 10 ----------------------
SIST TBR 020:2000
Page 9
TBR 20: September 1997

- "Test Cat" defines whether the requirement is covered by a "special test situation" (e.g. a

manufacturer’s declaration of some form). An "X" indicates a special test situation, whilst, a blank

entry indicates conformity is by the test referred to by this TBR.
Table 1: Requirements and Justifications
ETS 300 607-1 Description TBR Justification TD Cat Test
Item Cat
14.4.3 Co channel rejection - Non compliance in this area may
TCH/HS (SID frames) impair speech quality.
30.1 Sending sensitivity / If this requirement is not met, the MS g
frequency response will not be able to produce a
reasonable speech intelligibility.
30.2 Sending loudness rating If this requirement is not met, the MS g
will not be able to produce a
reasonable speech intelligibility.
30.3 Receiving sensitivity / If this requirement is not met, the MS g
frequency response will not be able to produce a
reasonable speech intelligibility.
30.4 Receiving loudness rating If this requirement is not met, the MS g
will not be able to produce a
reasonable speech intelligibility.
30.5.1 Side Tone Masking Rating If this requirement is not met, the MS g
(STMR) will not be able to produce a
reasonable speech intelligibility.
30.5.2 Listener Side Tone Rating If this requirement is not met, the MS g X
(LSTR) will not be able to produce a
reasonable speech intelligibility.
30.6.1 Telephone acoustic coupling If this requirement is not met, the MS g
loss (TAL) - Echo loss (EL) will not be able to produce a
reasonable speech intelligibility.
30.6.2 Telephone acoustic coupling If this requirement is not met, the MS g
loss (TAL) - Stability margin will not be able to produce a
reasonable speech intelligibility.
30.7.1 Distortion - Sending If this requirement is not met, the MS g
will n
...

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