ETSI EN 300 175-8 V1.4.2 (1999-06)

SLOVENSKI STANDARD
SIST EN 300 175-8 V1.4.2:2005
01-julij-2005
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Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 8:
Speech Coding and Transmission
Ta slovenski standard je istoveten z: EN 300 175-8 Version 1.4.2
ICS:
33.070.30 'LJLWDOQHL]EROMãDQH Digital Enhanced Cordless
EUH]YUYLþQHWHOHNRPXQLNDFLMH Telecommunications (DECT)
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SIST EN 300 175-8 V1.4.2:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 300 175-8 V1.4.2:2005

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SIST EN 300 175-8 V1.4.2:2005
EN 300 175-8 V1.4.2 (1999-06)
European Standard (Telecommunications series)
Digital Enhanced Cordless Telecommunications (DECT);
Common Interface (CI);
Part 8: Speech coding and transmission

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SIST EN 300 175-8 V1.4.2:2005
2 ETSI EN 300 175-8 V1.4.2 (1999-06)
Reference
REN/DECT-000129-8 (1me00jdc.PDF)
Keywords
DECT, radio
ETSI
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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 1999.
All rights reserved.
ETSI

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SIST EN 300 175-8 V1.4.2:2005
3 ETSI EN 300 175-8 V1.4.2 (1999-06)
Contents
Intellectual Property Rights . 6
Foreword. 6
1 Scope. 7
2 References . 8
3 Definitions and abbreviations. 9
3.1 Definitions . 9
3.2 Abbreviations. 10
4 Configurations . 11
4.1 Reference configuration. 11
4.1.1 Basic configuration . 11
4.1.2 Portable Part (PP). 12
4.1.2.1 Functional organization . 12
4.1.2.2 Volume control. 12
4.1.3 Fixed Part (FP). 13
4.1.3.1 Digital interface . 13
4.1.3.2 Analogue interface. 14
4.1.3.3 FP adaptive volume control. 14
4.2 Test configurations . 14
5 Encoding. 14
5.1 32 kbit/s full term (ADPCM). 14
5.1.1 Algorithm . 14
5.1.2 Bit sequence . 15
5.2 Other codings. 15
6 Transmission aspects . 15
6.1 Relative level . 15
6.2 Acoustic reference level. 15
6.3 Volume control . 15
7 Speech performance characteristics . 15
7.1 PP frequency responses . 15
7.1.1 Sending. 15
7.1.2 Receiving . 16
7.2 PP sending and receiving loudness ratings . 16
7.2.1 Nominal values. 16
7.2.2 User-controlled volume control in PP . 16
7.2.3 PP adaptive volume control. 17
7.2.4 FP adaptive volume control. 17
7.3 Sidetone . 18
7.3.1 Talker sidetone. 18
7.3.2 Listener sidetone . 18
7.4 Terminal coupling loss. 18
7.4.1 Weighted Terminal Coupling Loss (TLCw). 18
7.4.1.1 PP for the 3,1 kHz service (PSTN or ISDN) . 18
7.4.1.2 FP with 4-wire interface . 18
7.4.1.3 FP with analogue 2-wire interface . 19
7.4.1.4 PP for unrestricted 64 kbit/s service . 19
7.4.2 Stability loss. 19
7.4.2.1 Requirement . 19
7.4.2.2 Test conditions . 20
7.4.2.3 Fixed geometry PP. 20
7.4.2.4 Variable geometry PP. 20
7.5 Distortion. 20
ETSI

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SIST EN 300 175-8 V1.4.2:2005
4 ETSI EN 300 175-8 V1.4.2 (1999-06)
7.5.1 Sending. 20
7.5.2 Receiving . 20
7.5.3 Sidetone. 20
7.5.4 Recommended value for network planning . 20
7.6 Out of band signals . 20
7.6.1 Sending (discrimination against out of band input signals). 20
7.6.2 Receiving (spurious out of band signals) . 21
7.7 Noise. 21
7.7.1 Sending. 21
7.7.2 Narrow-band noise . 21
7.7.3 Receiving . 21
7.7.4 Level of sampling frequency (receiving). 21
7.8 Acoustic shock. 21
7.8.1 Continuous signal. 21
7.8.2 Peak signal . 21
7.9 Delay. 22
7.9.1 DECT network . 22
7.9.2 PP. 22
7.9.3 FP. 22
7.10 Network echo control. 22
7.11 PP ambient noise rejection. 23
7.12 Additional requirements for DECT systems provided with a 2-wire PSTN interface. 23
7.12.1 General. 23
7.12.1.1 Polarity independence. 23
7.12.1.2 Feed Conditions. 23
7.12.1.3 Power supply . 23
7.12.2 Speech performance characteristics . 23
7.12.2.1 Sensitivity/frequency response . 24
7.12.2.2 Sending and Receiving Loudness Ratings (SLR and RLR). 24
7.12.2.3 Distortion. 24
7.12.2.4 Noise. 24
7.12.2.5 Echo Return Loss. 24
8 Additional features . 24
8.1 Loudspeaking and hand-free facilities . 24
8.2 Tandem with mobile radio network . 24
8.2.1 Tandem with GSM. 25
8.2.1.1 Network echo control . 25
8.2.1.2 Terminal coupling loss . 25
8.2.1.3 The GSM mobile transmitter operates in continuous mode. 25
8.2.1.4 The GSM mobile transmitter operates in discontinuous mode, DTX. 25
8.3 DECT connected to the GSM fixed network . 25
8.3.1 Network echo control. 26
8.3.2 Terminal coupling loss. 26
8.4 Wireless Relay Stations (WRS) . 26
8.4.1 Modified FP network echo control requirements for implementation of 2 and 3 CRFP links in
cascade . 27
Annex A (informative): Description of "reference" echo control devices. 28
A.1 Handset echo. 28
A.1.1 Overview. 28
A.1.1.1 Connection to the PSTN/ISDN . 28
A.1.1.1.1 Local and national calls . 28
A.1.1.1.2 Long distance connections with echo control devices in the PSTN/ISDN, e.g. calls via satellites. 28
A.1.1.2 Connection to the GSM network. 29
A.1.2 Implementation of the FP echo control function. 29
A.1.2.1 Suppression threshold . 30
A.1.2.2 Static characteristics of activation control. 30
A.1.2.3 Dynamic characteristics of activation control . 30
ETSI

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SIST EN 300 175-8 V1.4.2:2005
5 ETSI EN 300 175-8 V1.4.2 (1999-06)
A.2 Network echo. 30
A.2.1 Soft suppressor implementation of requirement 2. 31
A.2.1.1 Static characteristics. 32
A.2.1.2 Dynamic characteristics . 32
A.2.2 Additional echo control for a 2-wire interface of requirement 1. 32
A.2.3 Echo canceller used for both requirements 1 and 2 . 33
Annex B (informative): Local loop application. 34
B.1 DECT tethered local loop replacement with 2-wire PP end system. 34
B.1.1 TCLw requirements . 34
B.1.2 Network echo. 35
B.2 Quantization distortion considerations. 35
Annex C (informative): GSM Discontinuous Transmission (DTX), and Voice Activity
Detection (VAD) . 36
Annex D (informative): Speech levels in relation to ambient room noise and examples of
adaptive volume control settings . 37
Bibliography . 38
History. 39
ETSI

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SIST EN 300 175-8 V1.4.2:2005
6 ETSI EN 300 175-8 V1.4.2 (1999-06)
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 SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect
of ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on the
ETSI Web server (http://www.etsi.org/ipr).
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 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 European Standard (Telecommunications series) has been produced by ETSI Project Digital Enhanced Cordless
Telecommunications (DECT).
The present document is part 8 of a multi-part EN covering the Common Interface (CI) for the Digital Enhanced
Cordless Telecommunications (DECT), as identified below:
Part 1: "Overview";
Part 2: "Physical layer (PHL)";
Part 3: "Medium Access Control (MAC) layer";
Part 4: "Data Link Control (DLC) layer";
Part 5: "Network (NWK) layer";
Part 6: "Identities and addressing";
Part 7: "Security features";
Part 8: "Speech coding and transmission".
Further details of the DECT system may be found in ETR 015 [18], ETR 043 [19], and ETR 056 [20].
National transposition dates
Date of adoption of this EN: 28 May 1999
Date of latest announcement of this EN (doa): 31 August 1999
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 29 February 2000
Date of withdrawal of any conflicting National Standard (dow): 29 February 2000
ETSI

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SIST EN 300 175-8 V1.4.2:2005
7 ETSI EN 300 175-8 V1.4.2 (1999-06)
1 Scope
The present document gives an introduction and overview of the complete Digital Enhanced Cordless
Telecommunications (DECT) Common Interface (CI).
This part of the DECT CI specifies the speech coding and transmission requirements.
In order to ensure satisfactory interworking of different portable and fixed units, it is necessary to specify the
transmission performance of the analogue information over the digital link. This requires not only use of a common
speech algorithm, but also standardization of frequency responses, reference speech levels (or loudness) at the air
interface and various other parameters.
The present document applies to DECT equipment which includes all the necessary functions to provide real-time
two-way speech conversation. A 3,1 kHz telephony teleservice conveyed over a DECT link (including Fixed Part (FP)
and Portable Part (PP)) which is capable of being connected (directly or indirectly) to the public network access point
has to comply with the requirements in the present document.
Tethered fixed point local loop applications are not required to comply with the requirements of the present document.
The speech performance characteristics defined in the present document typically conform to TBR 8 [13], which
specifies the overall performance between the handset acoustic interface and a 64 kbit/s A-law Pulse Code Modulated
(PCM) digital network interface. The deviations from TBR 8 [13] are mainly due to the consequences of non-PCM
coding and transmission delay.
The additional features described in clause 8 are those which are not included in TBR 8 [13], but which are likely to
occur in a DECT system: analogue interface, loudspeaking and hand-free facilities, tandeming with a mobile radio
network. Headsets are not covered by the present specifications.
For the DECT systems which connect to the Public Switched Telephone Network (PSTN) via an analogue interface, the
additional requirements, which have to be implemented in the FP, have as much as possible been aligned with
TBR 38 [17].
ETSI/STC TM5 has prepared a technical report, ETR 041 [21], to be used as a guide for network planning.
A summary of the control and the use of the DECT echo control functions, to guide on need for options to
manufacturers and installers, is found in annex A.
Information concerning test methods can be found in EN 300 176 [3]. The test methods take into account that DECT is a
digital system.
ETSI

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SIST EN 300 175-8 V1.4.2:2005
8 ETSI EN 300 175-8 V1.4.2 (1999-06)
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies.
• A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same
number.
[1] EN 300 175-1: "Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI);
Part 1: Overview".
[2] EN 300 175-5: "Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI);
Part 5: Network (NWK) layer".
[3] EN 300 176: "Digital Enhanced Cordless Telecommunications (DECT); Approval test
specification; (Part 1: Radio; Part 2: Speech)".
[4] ITU-T Recommendation G.101 (1996): "The transmission plan".
[5] ITU-T Recommendation G.131 (1996): "Control of talker echo".
[6] CCITT Recommendation G.164 (1988): "Echo suppressors".
[7] ITU-T Recommendation G.165 (1993): "Echo cancellers".
[8] ITU-T Recommendation G.701 (1993): "Vocabulary of digital transmission and multiplexing, and
pulse code modulation (PCM) terms".
[9] CCITT Recommendation G.726 (1991): "40, 32, 24, 16 kbit/s adaptive differential pulse code
modulation (ADPCM)".
[10] CCITT Recommendation I.241 (1988): "Teleservices supported by an ISDN".
[11] ITU-T Recommendation P.10 (1993): "Vocabulary of terms on telephone transmission quality and
telephone sets".
[12] ITU-T Recommendation P.340 (1996): "Transmission characteristics of hands-free telephones".
[13] TBR 8 (1998): "Integrated Services Digital Network (ISDN); Telephony 3,1 kHz teleservice;
Attachment requirements for handset terminals".
[14] ITU-T Recommendation G.113 (1996): "Transmission impairments".
[15] ITU-T Recommendation G.111 (1988): "Loudness ratings (LRs) in an international connection".
[16] ETS 300 540: "Digital cellular telecommunications system (Phase 2); Transmission planning
aspects of the speech service in the GSM Public Land Mobile Network (PLMN) system
(GSM 03.50)".
[17] TBR 38 (1998): "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".
[18] ETR 015: "Digital Enhanced Cordless Telecommunications (DECT); Reference document".
[19] ETR 043: "Digital Enhanced Cordless Telecommunications (DECT); Common interface; Services
and facilities requirements specification".
ETSI

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SIST EN 300 175-8 V1.4.2:2005
9 ETSI EN 300 175-8 V1.4.2 (1999-06)
[20] ETR 056: "Digital Enhanced Cordless Telecommunications (DECT); System description
document".
[21] ETR 041: "Transmission and Multiplexing (TM); Digital European Cordless Telecommunication
(DECT); Transmission aspects 3,1 kHz telephony; Interworking with other networks".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
Central Control Fixed Part (CCFP): see EN 300 175-1 [1].
Cordless Radio Fixed Part (CRFP): see EN 300 175-1 [1].
DECT Network (DNW): see EN 300 175-1 [1].
double duplex bearer: see EN 300 175-1 [1].
End System (ES): see EN 300 175-1 [1].
fixed geometry Portable Part (PP): PP in which the electro-acoustic transducers and their associated acoustic
components are held in fixed relat
...