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

DE/RES-03002-8

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

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Status
Published
Publication Date
26-Oct-1992
Technical Committee
Current Stage
13 - TB decision to make document historical
Completion Date
28-Sep-2001
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ETS 300 175-8 E1:2005
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.QHRadio Equipment and Systems (RES); Digital Enhanced Cordless Telecommunications (DECT); Common Interface (CI); Part 8: Speech coding and transmission33.070.30'(&7Digital Enhanced Cordless Telecommunications (DECT)ICS:Ta slovenski standard je istoveten z:ETS 300 175-8 Edition 1SIST ETS 300 175-8 E1:2005en01-julij-2005SIST ETS 300 175-8 E1:2005SLOVENSKI

STANDARD
SIST ETS 300 175-8 E1:2005

EUROPEANETS 300 175-8TELECOMMUNICATIONOctober 1992STANDARDSource: ETSI TC-RESReference: DE/RES-3001-8ICS:33.060Key words:DECTRadio Equipment and Systems (RES);Digital European Cordless Telecommunications (DECT)Common interfacePart 8: Speech coding and transmissionETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEX.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.frTel.: +33 92 94 42 00 - Fax: +33 93 65 47 16Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1992. All rights reserved.SIST ETS 300 175-8 E1:2005New presentation - see History box

Page 2ETS 300 175-8: October 1992Whilst 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.SIST ETS 300 175-8 E1:2005

Page 3ETS 300 175-8: October 1992ContentsForeword...........................................................................................................................................71Scope......................................................................................................................................92Normative references................................................................................................................93Definitions and abbreviations....................................................................................................113.1Definitions.................................................................................................................113.2Abbreviations............................................................................................................134Configurations.........................................................................................................................154.1Reference configuration.............................................................................................154.1.1Basic configuration.................................................................................154.1.2Portable Part (PP)..................................................................................164.1.2.1Functional organisation....................................................164.1.2.2Volume control...............................................................164.1.3Fixed Part (FP)......................................................................................174.1.3.1Digital interface..............................................................174.1.3.2Analogue interface..........................................................174.1.3.3FP adaptive volume control..............................................184.2Test configurations....................................................................................................185Encoding................................................................................................................................185.132 Kbit/s full term (ADPCM).......................................................................................185.1.1Algorithm...............................................................................................185.1.2Bit sequence..........................................................................................185.2Other codings...........................................................................................................186Transmission aspects..............................................................................................................186.1Relative level............................................................................................................186.2Acoustic reference level.............................................................................................186.3Volume control..........................................................................................................187Speech performance characteristics.........................................................................................197.1PP frequency responses............................................................................................197.1.1Sending.................................................................................................197.1.2Receiving...............................................................................................197.2PP sending and receiving loudness ratings..................................................................197.2.1Nominal values.......................................................................................197.2.2User-controlled volume control in PP........................................................197.2.3PP adaptive volume control.....................................................................207.2.4FP adaptive volume control.....................................................................207.3Sidetone...................................................................................................................207.3.1Talker sidetone......................................................................................207.3.2Listener sidetone....................................................................................217.4Terminal coupling loss...............................................................................................217.4.1Weighted Terminal Coupling Loss (TLCw)................................................217.4.1.1PP for the 3,1 kHz service (PSTN or ISDN)......................217.4.1.2FP with 4-wire interface..................................................217.4.1.3FP with analogue 2-wire interface....................................227.4.1.4PP for unrestricted 64 kbit/s service.................................227.4.2Stability loss..........................................................................................227.4.2.1Requirement...................................................................227.4.2.2Test conditions...............................................................22SIST ETS 300 175-8 E1:2005

Page 4ETS 300 175-8: October 19927.4.2.3Fixed geometry PP.........................................................227.4.2.4Variable geometry PP.....................................................237.5Distortion..................................................................................................................237.5.1Sending.................................................................................................237.5.2Receiving...............................................................................................237.5.3Sidetone................................................................................................237.5.4Recommended value for network planning................................................237.6Out of band signals...................................................................................................237.6.1Sending (discrimination against out of band input signals)..........................237.6.2Receiving (spurious out of band signals)...................................................247.7Noise........................................................................................................................247.7.1Sending.................................................................................................247.7.2Narrow-band noise.................................................................................247.7.3Receiving...............................................................................................247.7.4Level of sampling frequency (receiving)....................................................247.8Acoustic shock..........................................................................................................247.8.1Continuous signal....................................................................................247.8.2Peak signal............................................................................................247.9Delay.......................................................................................................................247.9.1DECT Network.......................................................................................247.9.2PP.........................................................................................................257.9.3FP.........................................................................................................257.10Network echo control.................................................................................................257.11PP ambient noise rejection.........................................................................................258Additional features...................................................................................................................268.1Loudspeaking and hand-free facilities..........................................................................268.2Tandem with mobile radio network..............................................................................268.2.1Tandem with GSM..................................................................................268.2.1.1Network echo control......................................................268.2.1.2Terminal coupling loss.....................................................268.2.1.3The GSM mobile transmitter operates in continuous mode.268.2.1.4The GSM mobile transmitter operates in discontinuousmode, DTX.....................................................................268.3DECT connected to the GSM fixed network................................................................278.3.1Network echo control..............................................................................278.3.2Terminal coupling loss.............................................................................27Annex A (informative): Description of "reference" echo control devices............................................28A.1Handset echo..........................................................................................................................28A.1.1Overview..................................................................................................................28A.1.1.1Connection to the PSTN/ISDN.................................................................28A.1.1.1.1Local and national calls...................................................28A.1.1.1.2Long distance connections with echo control devices in thePSTN/ISDN, e.g. calls via satellites..................................28A.1.1.2Connection to the GSM network..............................................................29A.1.2Implementation of the FP echo control function subclause 7.4.1.2 b).............................29A.1.2.1Suppression threshold.............................................................................29A.1.2.2Static characteristics of activation control.................................................30A.1.2.3Dynamic characteristics of activation control.............................................30A.2Network echo..........................................................................................................................30A.2.1Soft suppressor implementation of requirement 2 of subclause 7.10..............................31A.2.1.1Static characteristics..............................................................................31A.2.1.2Dynamic characteristics..........................................................................31A.2.2Additional echo control for a 2-wire interface of requirement 1 of subclause 7.10...........31A.2.3Echo canceller used for both requirements 1 and 2......................................................32SIST ETS 300 175-8 E1:2005

Page 5ETS 300 175-8: October 1992Annex B (informative):Local loop application..................................................................................33B.1DECT tethered local loop replacement with 2-wire PP end system..............................................33B.1.1TCLw requirements...................................................................................................33B.1.2Network echo...........................................................................................................34B.2Quantisation distortion considerations.......................................................................................34Annex C (informative):GSM Discontinuous Transmission (DTX), and Voice Activity Detection (VAD)..35Annex D (informative):Speech levels in relation to ambient room noise and examples of adaptivevolume control settings................................................................................36Annex E (informative):Public Access Profile (PAP): mandatory requirements regarding speechtransmission...............................................................................................37E.1General..................................................................................................................................37E.2User controlled volume control..................................................................................................37E.3PP ambient noise rejection capability feature.............................................................................37History.............................................................................................................................................38SIST ETS 300 175-8 E1:2005

Page 6ETS 300 175-8: October 1992Blank pageSIST ETS 300 175-8 E1:2005

Page 7ETS 300 175-8: October 1992ForewordThis European Telecommunication Standard (ETS) has been produced by the Radio Equipment andSystems (RES) Technical Committee of the European Telecommunications Standards Institute (ETSI), andwas adopted, having passed the ETSI standards approval procedure (Public Enquiry 23: 1991-09-02 to1991-12-27, Vote 22: 1992-05-25 to 1992-07-17).Annexes A, B, C and D to this ETS are informative.Further details of the DECT system may be found in the ETSI Technical Report ETR 015 [16] and ETR043 [15], and also in ETSI Draft Technical Report, "Digital European Cordless Telecommunications SystemDescription Document" [17].SIST ETS 300 175-8 E1:2005

Page 8ETS 300 175-8: October 1992Blank pageSIST ETS 300 175-8 E1:2005

Page 9ETS 300 175-8: October 19921ScopeThis part of the Digital European Cordless Telecommunications (DECT) Common Interface specifies thespeech coding and transmission requirements. It is Part 8 of a series of 9.In order to ensure satisfactory interworking of different portable and fixed units, it is necessary to specifythe transmission performance of the analogue information over the digital link. This requires not only use ofa common speech algorithm, but also standardisation of frequency responses, reference speech levels (orloudness) at the air interface and various other parameters.This part 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 FP andPP) which is capable of being connected (directly or indirectly) to the public network access point shallcomply with the requirements in this part.Tethered fixed point local loop applications are not required to comply with the requirements of this part.The speech performance characteristics defined in this document typically conform to ETS 300 085 [32],which specifies the overall performance between the handset acoustic interface and a 64 kbps A-law PulseCode Modulated (PCM) digital network interface. The deviations from ETS 300 085 [32] are mainly due tothe consequences of non-PCM coding and transmission delay.The additional features described in Clause 8 are those which are not included in ETS 300 085 [32], butwhich 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 analogueinterface, this document includes the basics on which the national specifications can be built, referring toprETS 300 001 [33] (which specifies the connection of terminal equipments to the PSTN via a 2-wireanalogue interface) and the appropriate national standard.ETSI/STC TM5 has prepared a technical report, ETR 041 "Transmission Multiplexing (TM) DigitalEuropean Cordless Telecommunications (DECT); Transmission aspects 3,1 kHz telephony, interworkingwith other networks" [20], 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 tomanufacturers and installers, is found in the supplementary services chapter of the technical report "DigitalEuropean Cordless Telecommunications System description document" [17].Information concerning test methods can be found in I-ETS 300 176 [12]. The test methods take intoaccount that DECT is a digital system.2Normative referencesThis European Telecommunication Standard (ETS) incorporates, by dated or undated reference,provisions from other publications. These normative references are cited at the appropriate places in thetext and the publications are listed hereafter. For dated references, subsequent amendments to orrevisions of any of these publications apply to this ETS only when incorporated in it by amendment orrevision. For undated references the latest edition of the publication referred to applies.[1]ETS 300 175-1: "Radio Systems and Equipment (RES); Digital EuropeanCordless Telecommunications (DECT) Common interface Part 1: Overview".[2]ETS 300 175-2: "Radio Systems and Equipment (RES); Digital EuropeanCordless Telecommunications (DECT) Common interface Part 2: Physical layer".[3]ETS 300 175-3: "Radio Systems and Equipment (RES); Digital EuropeanCordless Telecommunications (DECT) Common interface Part 3: Mediumaccess control layer".SIST ETS 300 175-8 E1:2005

Page 10ETS 300 175-8: October 1992[4]ETS 300 175-4: "Radio Systems and Equipment (RES); Digital EuropeanCordless Telecommunications (DECT) Common interface Part 4: Data linkcontrol layer".[5]ETS 300 175-5: "Radio Systems and Equipment (RES); Digital EuropeanCordless Telecommunications (DECT) Common interface Part 5: Network layer".[6]ETS 300 175-6: "Radio Systems and Equipment (RES); Digital EuropeanCordless Telecommunications (DECT) Common interface Part 6: Identities andaddressing".[7]ETS 300 175-7: "Radio Systems and Equipment (RES); Digital EuropeanCordless Telecommunications (DECT) Common interface Part 7: Securityfeatures".[8]ETS 300 175-8: "Radio Systems and Equipment (RES); Digital EuropeanCordless Telecommunications (DECT) Common interface Part 8: Speech codingand transmission".[9]ETS 300 175-9: "Radio Systems and Equipment (RES); Digital EuropeanCordless Telecommunications (DECT) Common interface Part 9: Public accessprofile".[10]Reserved.[11]Reserved.[12]I-ETS 300 176: "Radio Systems and Equipment (RES); Digital EuropeanCordless Telecommunications (DECT) Approval test specification".[13]Reserved for future ETS version of [12].[14]CEPT Recommendation T/SGT SF2 (89) 6/0 : "Draft Recommendation T/SFServices and Facilities of Digital European Cordless Telecommunications".[15]ETR 043: "Radio Systems and Equipment (RES); Digital European CordlessTelecommunications (DECT) Common interface Services and facilitiesrequirements specification".[16]ETR 015: "Digital European Cordless Telecommunications Referencedocument".[17]Draft ETSI Technical Report: "Digital European Cordless TelecommunicationsSystem description document".[18]ETR 042: "Radio Systems and Equipment (RES); Digital European CordlessTelecommunications (DECT); A guide to DECT features that influence the trafficcapacity and the maintenance of high radio link transmission quality, including theresults of simulations".[19]Reserved for future DECT document.[20]ETR 041: "Transmission Multiplexing (TM) Digital European CordlessTelecommunications (DECT) Transmission aspects 3,1 kHz telephony,interworking with other networks".[21]CCITT Recommendation G.101 (1988): "The Transmission Plan".[22]CCITT Recommendation G.131 (1988): "Stability and echo".SIST ETS 300 175-8 E1:2005

Page 11ETS 300 175-8: October 1992[23]CCITT Recommendation G.164 (1988): "Echo Suppressors".[24]CCITT Recommendation G.165 (1988): "Echo Cancellers".[25]CCITT Recommendation G.173 (1988): "Transmission planning aspects of thespeech service in digital public land mobile networks".[26]CCITT Recommendation G.701 (1988): "Vocabulary of digital transmission andmultiplexing, and pulse code modulation".[27]CCITT Recommendation G.711 (1988): "Pulse code modulation (PCM) of voicefrequencies".[28]CCITT Recommendation G.721 (1988): "32 kbit/s adaptive differential pulsecode modulation (ADPCM)".[29]CCITT Recommendation I.241 (1988): "Teleservices supported by an ISDN".[30]CCITT Recommendation P.10 (1988): "Vocabulary of terms on telephonetransmission quality and telephone sets".[31]CCITT Recommendation P.34 (1988): "Transmission characteristics of hands-free telephones".[32]ETS 300 085: "Integrated Services Digital Network (ISDN): 3,1 kHz telephonyteleservice; Attachment requirements for handset terminals" (text relevant forNET 33).[33]prETS 300 001: "Attachments to Public Switched Telephone Network (PSTN);General technical requirements for equipment connected to an analoguesubscriber interface in the PSTN" (Candidate NET 4).[34]CCITT Recommendation G.113 (1988): "Transmission Impairments".[35]CCITT Recommendation G.111 (1988): "General recommendations on thetransmission quality for an entire international telephone connection".[36]GSM Recommendation 03.50: "Transmission Planning Aspects of the SpeechService in the GSM PLMN System (Version 3.1.0)".3Definitions and abbreviations3.1DefinitionsFor the purpose of this ETS, the following definitions which are listed in alphabitical order, apply:Central Control Fixed Part (CCFP): a physical grouping that contains the central elements of a fixed part.A fixed part shall contain a maximum of one CCFP.NOTE:A CCFP controls one or more RFPs.DECT NetWork (DNW): a network that uses the DECT air interface to interconnect a local network (LNW)to one or more portable applications. The logical boundaries of the DECT network are defined to be at thetop of the DECT network layer.NOTE:A DECT NetWork (DNW) is a logical grouping that contains one or more Fixed radioTerminations (FTs) plus their associated Portable radio Termination (PTs). Theboundaries of the DECT network are not physical boundaries.SIST ETS 300 175-8 E1:2005

Page 12ETS 300 175-8: October 1992End System (ES): a logical grouping that contains application processes and supports telecommunicationservices.NOTE:From the OSI point of view, end systems are considered as sources and sinks ofinformation.Fixed geometry (PP): a Portable Part (PP) in which the electro-acoustic transducers and their associatedacoustic components are held in fixed relative positions and/or orientations during all on-line conditions andtest conditions of the PP.Fixed Part (DECT Fixed Part) (FP): a physical grouping that contains all of the elements in the DECTnetwork between the Local NetWork (LNW) and the DECT air interface.NOTE:A DECT fixed part contains the logical elements of at least one Fixed radio Termination(FT), plus additional implementation specific elements.Fixed part Termination (FT): a logical group of functions that contains all of the DECT processes andprocedures on the fixed side of the DECT air interface.NOTE:A Fixed radio Termination (FT) only includes elements that are defined in the DECT CIstandard. This includes radio transmission elements (layer 1) together with a selectionof layer 2 and layer 3 elements.Handset echo: the echo, perceptible by the far-end user, resulting from the coupling between thereceiving and sending directions of the handset, mostly due to acoustic coupling between transducers. It isparticularly objectionable in communications including a satellite and an echo canceller, as the DECThandset echo may be out of range of the echo canceller.Network (telecommunication network): all the means of providing telecommunication services betweena number of locations where the services are accessed via equipment attached to the network.Network echo: the echo, perceptible by the DECT user, resulting from reflections in the network. It ismostly due to hybrid impairments at both ends of the communication.Operator: the individual or entity who or which is responsible for operation of one or more DECT fixedparts.NOTE:The term does not imply any legal or regulatory conditions, nor does it imply anyaspects of ownership.Portable HandSet (PHS): a single physical grouping that contains all of the portable elements that areneeded to provide a teleservice to the user.NOTE:Portable HandSet (PHS) is a subset of all possible Portable Parts (PPs). This subsetincludes all physical groupings that combine one Portable radio Termination (PT) plus atleast one portable application in a single physical box.Portable Part (DECT Portable Part) (PP): a physical grouping that contains all elements between theuser and the DECT air interface. Portable Part (PP) is a generic term that may describe one or severalphysical pieces.NOTE:A DECT Portable Part (PP) is logically divided into one Portable Termination (PT) plusone or more portable applications.Portable radio Termination (PT): a logical group of functions that contains all of the DECT processesand procedures on the portable side of the DECT air interface.NOTE:A Portable radio Termination (PT) only includes elements that are defined in the DECTCI standard. This includes radio transmission elements (layer 1) together with aselection of layer 2 and layer 3 elements.SIST ETS 300 175-8 E1:2005

Page 13ETS 300 175-8: October 1992Public: an attribute indicating that the application of the so qualified term, e.g. a network, a equipment, aservice, is offered to or is in the interest of the general public.NOTE:The term does not include any legal or regulatory aspects, nor does it indicate anyaspects of ownership.Public Access Profile (PAP): a defined part of the DECT Common Interface standard (DECT CI) thatensures interoperability between Fixed Parts (FPs) and Portable Parts (PPs) for public access services.Public access service: a service that provides access to a public network for the general public.NOTE:The term does not imply any legal or regulatory aspect, nor does it imply any aspectsof ownership.Radio Fixed Part (RFP): one physical sub-group of a Fixed Part (FP) that contains all the Radio EndPoints (REPs) (one or more) that are connected to a single antenna system.Service provider (telecommunications service provider): the individual or entity who or whichinterfaces to the customer in providing telecommunications service.NOTE 1:The term does not imply any legal or regulatory conditions, nor does it indicate whetherpublic service or private service is provided.NOTE 2:The term service provider is also used with a different meaning in the ISO/OSI layeredmodel.Telephony service: a definition of telephony service is found in CCITT Recommendation I.241 [29].User (of a telecommunication network): a person or machine delegated by a subscriber (by acustomer) to use the services and/or facilities of a telecommunication network.Variable geometry (PP): a PP that allows the position and/or orientation of its electro-acoustictransducers and their associated acoustic components to be changed during all on-line conditions of thePP.3.2AbbreviationsRelevant definitions and abbreviations in CCITT Recommendations P.10 [30] and G.701 [26] apply.ADPCMAdaptive Differential Pulse Code ModulationARLAcoustic Reference LevelCCFPCentral Control Fixed Part. See definitionsCCITT(The) International Telegraph and Telephone Consultative CommitteeCICommon Interface (standard)CLRRCircuit Loudness Rating, ReceivingCLRSCircuit Loudness Rating, SendingCODECCOder-DECoderCSPDNCircuit Switched Public Data NetworkdBmdB relative to 1 milliwattdBm0The absolute power level in decibels referred to a point of zero relative levelSIST ETS 300 175-8 E1:2005

Page 14ETS 300 175-8: October 1992dBrThe relative power level in decibelsDECTDigital European Cordless TelecommunicationsERPEar Reference PointESEnd SystemFPFixed Part. See definitionsFTFixed radio Termination. See definitionsISDNIntegrated Services Digital NetworkLELocal EchoLSTRListener Sidetone RatingMRPMouth Reference PointNLPNon-Linear ProcessorOLROverall Loudness RatingP(A)BXPrivate (Automatic) Branch eXchangePPPortable Part. See definitionsPSPDNPacket Switched Public Data NetworkPSTNPublic Switched Telephone NetworkPTPortable radio Termination. See definitionsPTNPrivate Telecommunication NetworkReFPReference Fixed PartRePPReference Portable PartRFPRadio Fixed Part. See definitio

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