ETSI EN 300 175-8 V1.8.1 (2004-11)

Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 8: Speech coding and transmission

REN/DECT-000215-8

Digitalne izboljšane brezvrvične telekomunikacije (DECT) - Skupni vmesnik (CI) - 8. del: Kodiranje in prenos govora

General Information

• Status: Published
• Publication Date: 17-Nov-2004
• Technical Committee: DECT - Digital Enhanced Cordless Telecommunications (DECT)
• Current Stage: 12 - Completion
• Due Date: 26-Nov-2004
• Completion Date: 18-Nov-2004
• Ref Project: SIST EN 300 175-8 V1.8.1:2005 - Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 8: Speech coding and transmission

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 300 175-8 V1.8.1:2005
01-julij-2005
'LJLWDOQHL]EROMãDQHEUH]YUYLþQHWHOHNRPXQLNDFLMH'(&76NXSQLYPHVQLN&,
GHO.RGLUDQMHLQSUHQRVJRYRUD
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 1.8.1
ICS:
33.070.30 'LJLWDOQHL]EROMãDQH Digital Enhanced Cordless
EUH]YUYLþQHWHOHNRPXQLNDFLMH Telecommunications (DECT)
'(&7
SIST EN 300 175-8 V1.8.1:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 300 175-8 V1.8.1:2005

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SIST EN 300 175-8 V1.8.1:2005

ETSI EN 300 175-8 V1.8.1 (2004-11)
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 V1.8.1:2005
 2 ETSI EN 300 175-8 V1.8.1 (2004-11)



Reference
REN/DECT-000215-8
Keywords
DECT, radio
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ETSI

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SIST EN 300 175-8 V1.8.1:2005
 3 ETSI EN 300 175-8 V1.8.1 (2004-11)
Contents
Intellectual Property Rights.6
Foreword.6
1 Scope.7
2 References.7
3 Symbols and abbreviations.8
3.1 Symbols.8
3.2 Abbreviations.8
4 Configurations.10
4.1 Reference configuration.10
4.1.1 Basic configuration.10
4.1.2 Portable Part (PP) .11
4.1.2.1 Functional organization.11
4.1.2.2 Volume control.11
4.1.3 Fixed Part (FP).12
4.1.3.1 Digital interface.12
4.1.3.2 Analogue interface.12
4.1.3.3 FP adaptive volume control .13
4.2 Test configurations.13
5 Encoding.13
5.1 32 kbit/s full term (ADPCM) .13
5.1.1 Algorithm.13
5.1.2 Bit sequence.13
5.2 Other codings.13
6 Transmission aspects.14
6.1 Relative level.14
6.2 Acoustic reference level .14
6.3 Volume control.14
7 Speech performance characteristics .14
7.1 PP frequency responses .14
7.1.1 Sending.14
7.1.2 Receiving.15
7.2 PP sending and receiving loudness ratings.15
7.2.1 Nominal values.15
7.2.2 User-controlled volume control in PP.15
7.2.3 PP adaptive volume control .16
7.2.4 FP adaptive volume control .16
7.3 Sidetone.16
7.3.1 Talker sidetone.16
7.3.2 Listener sidetone.17
7.4 Terminal coupling loss .17
7.4.1 Weighted Terminal Coupling Loss (TCLw).17
7.4.1.1 PP for the 3,1 kHz service (PSTN or ISDN).17
7.4.1.2 FP with 4-wire interface.17
7.4.1.3 FP with analogue 2-wire interface .18
7.4.1.4 PP for unrestricted 64 kbit/s service.18
7.4.2 Stability loss.18
7.4.2.1 Requirement.18
7.4.2.2 Test conditions.19
7.4.2.3 Fixed geometry PP .19
7.4.2.4 Variable geometry PP .19
7.5 Distortion.19
7.5.1 Sending.19
ETSI

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SIST EN 300 175-8 V1.8.1:2005
 4 ETSI EN 300 175-8 V1.8.1 (2004-11)
7.5.2 Receiving.19
7.5.3 Sidetone.19
7.5.4 Recommended value for network planning .19
7.6 Out of band signals.19
7.6.1 Sending (discrimination against out of band input signals) .19
7.6.2 Receiving (spurious out of band signals).20
7.7 Noise.20
7.7.1 Sending.20
7.7.2 Narrow-band noise.20
7.7.3 Receiving.20
7.7.4 Level of sampling frequency (receiving) .20
7.8 Acoustic shock.20
7.8.1 Continuous signal.20
7.8.2 Peak signal.20
7.9 Delay.21
7.9.1 DECT network.21
7.9.2 PP.21
7.9.3 FP.21
7.10 Network echo control .21
7.11 PP ambient noise rejection .22
7.12 Additional requirements for DECT systems provided with a 2-wire PSTN interface.22
7.12.1 General.22
7.12.1.1 Polarity independence.22
7.12.1.2 Feed Conditions.22
7.12.1.3 Power supply.22
7.12.2 Speech performance characteristics.22
7.12.2.1 Sensitivity/frequency response.23
7.12.2.2 Sending and Receiving Loudness Ratings (SLR and RLR) .23
7.12.2.3 Distortion.23
7.12.2.4 Noise.23
7.12.2.5 Echo Return Loss.23
8 Additional features.23
8.1 Loudspeaking and hand-free facilities.23
8.2 Tandem with mobile radio network.23
8.2.1 Tandem with GSM.24
8.2.1.1 Network echo control.24
8.2.1.2 Terminal coupling loss.24
8.2.1.3 The GSM mobile transmitter operates in continuous mode .24
8.2.1.4 The GSM mobile transmitter operates in discontinuous mode, DTX .24
8.3 DECT connected to the GSM fixed network.24
8.3.1 Network echo control.25
8.3.2 Terminal coupling loss.25
8.4 Wireless Relay Stations (WRS).25
8.4.1 Modified FP network echo control requirements for implementation of 2 and 3 CRFP links in
cascade.26
Annex A (informative): Description of "reference" echo control devices.27
A.1 Handset echo.27
A.1.1 Overview.27
A.1.1.1 Connection to the PSTN/ISDN.27
A.1.1.1.1 Local and national calls.27
A.1.1.1.2 Long distance connections with echo control devices in the PSTN/ISDN, e.g. calls via satellites.27
A.1.1.2 Connection to the GSM network .28
A.1.2 Implementation of the FP echo control function .28
A.1.2.1 Suppression threshold.29
A.1.2.2 Static characteristics of activation control .29
A.1.2.3 Dynamic characteristics of activation control.29
A.2 Network echo.29
A.2.1 Soft suppressor implementation of requirement 2.30
A.2.1.1 Static characteristics.31
ETSI

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SIST EN 300 175-8 V1.8.1:2005
 5 ETSI EN 300 175-8 V1.8.1 (2004-11)
A.2.1.2 Dynamic characteristics.31
A.2.2 Additional echo control for a 2-wire interface of requirement 1.31
A.2.3 Echo canceller used for both requirements 1 and 2.32
Annex B (informative): Local loop application .33
B.1 DECT tethered local loop replacement with 2-wire PP end system.33
B.1.1 TCLw requirements.33
B.1.2 Network echo.34
B.2 Quantization distortion considerations.34
Annex C (informative): GSM Discontinuous Transmission (DTX), and Voice Activity
Detection (VAD).35
Annex D (informative): Speech levels in relation to ambient room noise and examples of
adaptive volume control settings .36
Annex E (informative): Bibliography.37
Annex F (informative): Change history .38
History .39

ETSI

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SIST EN 300 175-8 V1.8.1:2005
 6 ETSI EN 300 175-8 V1.8.1 (2004-11)
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 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 deliverable. Full details of the entire series can be found in part 1 [1].
Further details of the DECT system may be found in TR 101 178 and ETR 043 (see bibliography).

National transposition dates
Date of adoption of this EN: 12 November 2004
Date of latest announcement of this EN (doa): 28 February 2005
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 August 2005
Date of withdrawal of any conflicting National Standard (dow): 31 August 2005

ETSI

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SIST EN 300 175-8 V1.8.1:2005
 7 ETSI EN 300 175-8 V1.8.1 (2004-11)
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
should 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 008 (see
bibliography), 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 008 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 008, 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 are implemented in the FP, have as much as possible been aligned with TBR 038
(see bibliography).
ETSI/STC TM5 has prepared a technical report, ETR 041(see bibliography), 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.
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 and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
[1] ETSI EN 300 175-1: "Digital Enhanced Cordless Telecommunications (DECT); Common
Interface (CI); Part 1: Overview".
[2] ETSI EN 300 175-5: "Digital Enhanced Cordless Telecommunications (DECT); Common
Interface (CI); Part 5: Network (NWK) layer".
ETSI

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SIST EN 300 175-8 V1.8.1:2005
 8 ETSI EN 300 175-8 V1.8.1 (2004-11)
[3] ETSI EN 300 176 (all parts): "Digital Enhanced Cordless Telecommunications (DECT); Test
specification; (Part 1: Radio; Part 2: Speech)".
[4] Void.
[5] Void.
[6] Void.
[7] Void.
[8] ITU-T Recommendation G.701 (1993): "Vocabulary of digital transmission and multiplexing, and
pulse code modulation (PCM) terms".
[9] ITU-T Recommendation G.726 (1990): "40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code
Modulation (ADPCM)".
[10] Void.
[11] ITU-T Recommendation P.10: "Vocabulary of terms on telephone transmission quality and
telephone sets".
[12] ITU-T Recommendation P.340: "Transmission characteristics and speech quality parameters of
hands-free terminals".
[13] Void.
[14] ITU-T Recommendation G.111 (1993): "Loudness Ratings (LRs) in an international connection".
[15] ETSI ETS 300 540: "Digital cellular telecommunications system (Phase 2) (GSM); Transmission
planning aspects of the speech service in the GSM Public Land Mobile Network (PLMN) system
(GSM 03.50)".
3 Symbols and abbreviations
3.1 Symbols
For the purposes of the present document, the symbols given in ITU-T Recommendations P.10 [11], G.701 [8],
EN 300 175-1 [1] and the following apply:
dBm: absolute power level relative to 1 milliwatt, expressed in dB
dBm0: absolute power level in dBm referred to a point of zero relative level (0 dBr point)
dBPa: sound pressure level relative to 1 Pa, expressed in dB
dBPa(A): a-weighted sound pressure level relative to 1 Pa, expressed in dB
dBr: relative power level of a signal in a transmission path referred to the level at a reference point on the path (0 dBr
point)
3.2 Abbreviations
For the purposes of the present document, the abbreviations given in ITU-T Recommendations P.10 [11], G.701 [8] and
the following apply:
ADPCM Adaptive Differential Pulse Code Modulation
BSS Base Station Sub-sys
...