1、- STDaETSI EG 201 050-ENGL 1999 3400855 037b809 881 EG 201 050 1.2.2 (1999-02) ETSI Guide Speech Processing, Transmission and Quality Aspects (STQ); Overall Transmission Plan Aspects for Telephony in a Private Network STDmETSI EG 201 050-ENGL 1999 a 3400855 037b810 5T3 a 2 EO 201 050 V1.2.2 (199942)
2、 Reference REWSTQ-00006 (9qOOOip.PDF) Keywards ISDN, PSTN, speech, quality, private, network, telephony, interworking, transmission, planning, PINX, e-Model ETSI Postal address F-O6921 Sophia Antipolis Cedex - FRANCE Offlce address 650 Route des Lucioles - Sophia Antipolis Valbonne - FRANCE Siret No
3、 348 623 562 00017 - NAF 742 C Association a but non lucfa enregistre la Sous-Recture de Cirasse (06) No 780- Tel.: +334 92 94 42 O0 Fax: +33 4 9365 47 16 Internet secretariat etsi.fr Individual copies of this ETSI deliverable can be downloaded from httpr/www.etsi.org If you find errors in the prese
4、nt document, send your comment to: editoretsi.fr 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 O European Telecommunications Slandards Institute 1999. AU rights reserved. ET
5、SI STD-ETSI EG 201 050-ENGL 1999 3400855 037b811 43T W 3 E 201 O50 V1.2.2 (199942) Contents List of Figures 7 List of Tables 9 Intellectual Property Rights 10 Foreword 10 Introduction 11 1 scope 12 2 References 13 3 Abbreviations . 14 4 4.1 4.2 4.3 4.4 4.4.1 4.4.2 4.4.3 4.5 Definitions 16 Private Ne
6、two rk . 16 Public Network 16 Quality Aspects 17 Network Elements 17 Terminal Elements . 18 Connection Elemnts 18 Transmission Elements . 18 Types of Connections 18 5 Reference Configurations 19 6 Basic Planning Prtnciples 21 6.1 The Impairment Factor Method . 22 6.2 The E-Model 24 7 7.1 7.2 7.3 7.4
7、 7.5 7.6 7.7 7.8 7.8.1 7.8.2 7.9 7.10 Parameters subject to planning and their Limits 25 Overall Loudness Rating 25 Echo . 26 Transmission Time in Echofree Connections 27 Stability 28 Quantization Distortion Units 29 Equipment Impairment Factor . 30 Advanage Factor A . 30 Limits at the Public / Priv
8、ate Interface with respect to Echo . 31 Public / Private Network Interfaces - Europe . 31 Public / Private Network Interfaces - North America . 31 Parameters not directly subject to Transmission Planning . 32 Synchronization . 33 8 Calculation of End-to-End Parameters . 33 8.1 Overall Loudness Ratin
9、g 34 8.2 Talker Echo 36 8.2.1 Calculation for Connections with one Echo Path . 36 8.2.2 Calcuiation for Connections with two Echo Paths . 37 8.3 Transmission Time in Echofree Connections 40 8.4 Quantization Distortion Units . 40 8.5 Equipment Impairment Factor . 40 9 Application of the E-Model in Pl
10、anning Practice 41 9.1 General . 41 9.2 Reference Configurations 41 9.3 Handling of the Input Parameters 45 9.4 Interpretation of the Results . 46 9.5 Application of the E-Model for Configurations with two Echo Paths . 47 ETSI STDaETSI EG 201 050-ENGL 1qqq H 3400855 037b8L2 37b 9.6 9.7 10 10.1 10.2
11、10.3 10.4 10.5 11 11.1 11.2 11.3 1 1.4 11.5 11.6 4 EG 201 O50 V1.2.2 (1 999-02) Use of Computer Programs 49 Default Values and Parameter Ranges . 50 Rules for the Insertion of Echo Cancellers 50 Introduction 50 Characteristics of the Echo Cancellers . 51 Limits for the Application of Echo Cancellers
12、 . 51 Determination of the Location . 52 Handling of Echo Cancellers in the E-Model 54 Realization of Planning 54 General . 54 Determination of the specific Requirements 55 Definition of the Reference Configurations . 56 Determination of the Transmission Parameters . 56 End-End Calculation with the
13、E-Model . 57 Analysis of the Results . 57 Annex A (informative): General Guidance and Information on Transmission Parameters 59 A.l General . 59 A.2 Loss Definitions . 59 A.3 Loudness Ratings . 60 A.4 Definitions of Levels and their Units . 62 A.4.1 The Unit dB . 62 A.4.2 The Unit dBm 62 A.4.3 The U
14、nit dBr 62 A.4.4 The Unit dBm0 63 A.4.5 The Letter “p“ in the Units dBmp and dBrrd3p . 63 A.4.6 Relationship between the different Levels . 63 AS Delay and Echo 64 A.5.1 Influence of Delay in Telephone Connections . 64 A.5.2 Echo Effects in Telephone Connections 65 A.5.2.1 Talker Echo 65 A.5.2.2 Lis
15、tener Echo . 66 A.5.2.3 Echo Sources and Echo Loss 66 A.5.3 Methods for Echo Control . 68 A.5.3.1 Echo Suppressors . 69 A.5.3.2 Echo Cancellers . 69 A.5.3.3 Echo Control in specific Applications . 70 A.5.3.3.1 Effective Echo Paths . 70 AS .3. 3.2 Operation of Echo Cancellers and Soft Suppressors 72
16、A.5.3.3.3 Provision of Echo Control for the Talker of the Public Network . 73 A.6 Stability 73 Annex B (informative): The E-Model . 75 B.l General . 75 B.2 Reference Connection and used Transmission Parameters . 75 B.3 Calculation of the Transmission Rating Factor R 75 B.3.1 The Basic Signal to Nois
17、e Ratio Ro . 76 B.3.2 The Simultaneous Impairment Factor Is 77 B.3.3 The Delay Impairment Factor Id 78 B.3.4 The Equipment Impairment Factor Ie 79 B.3.5 The Expectation Factor A 79 ETSI STD=ETSI EG 201 050-ENGL 1999 3400855 0376833 202 5 EG 201 050 V1.2.2 (1999-02) B.4 Quality Measures derived from
18、the Transmission Rating Factor R 79 Annex C (informative): Transmission Parameters for specific Elements 81 C.l Elements in Pnvate Networks 81 C . 1.1 Wired Telephone Sets 81 C . 1.1.1 Analogue Telephone Sets . 81 C.1.1.2 Digitai Telephone Sets . 82 C.1.2 Wireless Telephone Sets 82 C.1.3 Switching E
19、quipment . 83 C.1.4 Leased Lines and Tie Trunks . 86 C.1.5 Privately owned Cable Links . 87 C.1.6 Satellite Links 87 C.1.7 Low Bit-rate Coding 87 C.1.8 Packetized Voice . 88 C.1.9 Echo Cancellers . 88 C.2 Transmission Parameters of Public Networks . 90 C.2.1 Loss 92 C.2.2 Mean one-way Delay . 92 (2.
20、2.3 Echo Loss . 92 C.2.4 Insertion of Echo Cancellers 92 C.2.5 Quantization Distortion Units (qdu) . 92 C.2.6 Equipment Impairment Values (le) 93 C.3 Transmission Parameter of the Far-end Termination 93 C.3.1 European Far-end Termhation Scenarios 93 C.3.2 North Amencan Far-end Tenninations 94 Planni
21、ng Examples 97 Planning Example for the European Scenario . 97 Description of the Network and Users Demand 97 Annex D (informative): D.l D.l.l D.1.2 Definition of Reference Configurations . 98 D.1.3 Determination of the Transmission Parameters . 99 D.1.4 End-to-End Calculation with the E-Model . 102
22、 D.1.5 Analysis of the Results . 109 D . 1.6 Application of Echo Cancellers . 110 D.2 D.2.1 Definition of Reference Configurations . 112 D.2.2 Determination of the Transmission Parameters . 113 D.2.3 End-to-End Calculation with the EModel . 113 D.2.4 D.2.4.1 Precalculations for Configuration la 114
23、D.2.4.1.1 Calculation of SLR, RLR 114 D.2.4.1.2 Taker Echo Loudness Rating (TELR) . 115 D.2.4.1.3 Delay Values T, Ta and Tr . 115 D.2.4.1.4 Number of Quantization Distortion 115 D.2.4.1.5 Equipment Impairment Factor 115 D.2.4.2 Input Parameters Summary Table 116 D.2.4.3 Results - Conguration la 116
24、D.2.5 Reference Configuration lb (Digitai Set A, Analogue Set 0 B) . 117 D.2.5.1 Precalculations for Configuration Ib 118 D.2.5.1.1 Calculation of SLR, RLR 118 D.2.5.1.2 Talker Echo Loudness Rating (TELR) . 118 D.2.5.1.3 Delay Values T, Ta and Tr . 119 D.2.5.1.4 Number of Quantization Distortion 119
25、 D.2.5.1.5 Equipment Impairment Factor 119 D.2.5.2 Input Parameters S- Table 120 D.2.5.3 Results 121 D.2.6 Reference configuration 2 (Portable connection scenario) 122 Planning Example for the North American Scenarios . 112 Reference Configuration la (Analogue Set A, Analogue Set B) . 113 ETSI STD.E
26、TS1 EG 201 050-ENGL 1999 W 3400855 037bBL4 149 6 EG 201 O50 V1.2.2 (199942) D.2.6.1 Precalculations for Configuration 2 123 D.2.6.1.1 Calculation of SU. RLR 123 D.2.6.1.2 Talker Echo Loudness Ratig (TELR) . 123 D.2.6.1.3 Delay Values T, Ta and Tr . 123 D.2.6.1.4 Number of Quantization Distortion 123
27、 D.2.6.1.5 Equipment Impairment Factor 124 D.2.6.2 Input Parameters Summary Table 124 D.2.6.3 Results 125 D.2.6.3.1 Unlicensed: Wireless Processing Delay: 7 ms average (WUPE. PCI. PWT) 125 D.2.6.3.2 Licensed: Wireless Processing Delay: 100 ms average (DMA-IS641-EFRC) 126 D.2.7 Reference Configuraton
28、 3a (Analogue set B) . 126 D.2.7.1 Precalculations for Configuration 3a 127 D.2.7.1.1 Calculation of SLR, RLR 127 D.2.7.1.2 Talker Echo Loudness Rating (TELR) . 128 D.2.7.1.3 Delay Values T, Ta and Tr . 128 D.2.7.1.4 Number of Quantization Distortion 128 D.2.7.1.5 Quipment Impairment Factor 128 D.2.
29、7.2 Input Parameters Summary Table 129 D.2.7.3 Results 129 D.2.7.3.1 Unlicensed Wireless Processing Delay: 7 ms average (WUPE, PCI, PWT) 129 D.2.7.3.2 Licensed: Wireless Processing Delay: 100 ms average (TDMA-IS41-EFRc) . 130 D.2.8 D.2.8.1 Precalculations for Configuration 3b 131 D.2.8.1.1 Calculati
30、on of SLR, RLR 131 D.2.8.1.2 Taker %ho Loudness Rating (TELR) . 132 D.2.8.1.3 Delay Values T, Ta and Tr . 132 D.2.8.1.4 Number of Quantization Distortion 132 D.2.8.1.5 Equipment Impairment Factor 132 D.2.8.2 Input Parameters Summary Table 133 D.2.8.3 Results 133 D.2.8.3.1 Unlicensed: Wireless Proces
31、sing Delay: 7 ms average (“WE. PCI, PWT) . 133 D.2.8.3.2 Licensed Wireless Processing Delay: 100 ms average (TDMA-IS641-EFRC) . 134 Bibliography . 135 History 136 Reference Configuration 3b (Digital set side B) . 130 STD=ETSI EG 201 050-ENGL 1999 3400855 033b815 085 7 EO 201 o50 VI . 2.2 (I 999-02)
32、List of Figures Figure 1: Basic Configuration for the Interconnection between Private and Public Network . 19 Figure 2: Standard Configuration with a fuly Digital Routing witbin the Private Network . 20 Figure 3: Private Network with 4-wire/2-wire Conversion . 20 Figure 4: Digitally connected Wirele
33、ss Telephone Set . 21 Figure 5: General Configuration for Calls via Public Networks . 22 Figure 6: Example for the Addition of Impairments on a “Psychological Scale . 23 Figure 7: Relation between OLR and Total Impairment Value Itot 26 Figure 8: Total Impairment Value Itot due to Talker Echo . 27 Fi
34、gure 9: Relationbetween Absolute Delay Ta and the Total Impairment Value Itot 28 Figure 10: Relationbetween the Number of qdu and the Total Impairment Value Itot 29 Figure 11: Reference Connection for the Calculation of SLR and RLR . 34 Figure 12: Reference Connection for Echo Calculations with one
35、Echo Path 37 Figure 13: Reference Connection for Echo Calculations with two Echo Paths 38 Figure 14 Details inside a Cordless Telephone with respect to Echo Control . 39 Figure 15: Basic Reference ConFiguration of the E-Model . 42 Figure 16: Working Configuration for 2-wire 12-wire Connections . 43
36、Figure 17: Working Configuration for 4-wire I 2-wire Connections . 44 Figure 18: Working Configuration for 2-wire 14-wire Connections . 44 Figure 19: Working Configuration for fully digital Connections 45 Figure 20: Application of a Pair of Echo Cancellers within the Private Network . 52 Figure 21:
37、Options for the Location of an Echo Canceller . 53 Figure 22: Use of Echo Cancellers in an Internetwork or International Connection . 53 Figure 23: Judgement of a Connection on a liem Quality Scale . 58 Figure A.l: Loss Contribution in a Telephone Connection 59 Figure A.2: Definition of Powers P1 an
38、d P2 . 59 Figure A.3: Effect of Talker Echo 65 Figure A.4: Effect of Listener Echo . 66 Figure AS: Baiance Return Loss and Transhybrid Loss 67 Figure A.6: Coupling in a Digital Telephone Set 67 Figure A.7: Application of Echo Control Devices 68 Figure A.8: Echo Suppressor 69 Figure A.9: Echo Cancell
39、er . 69 ETSI STD-ETSI EG 201 050-ENGL 1999 3400855 037b8Lb TL1 8 EO 201 O50 V1.2.2 (199942) Figure A.10: Possible Echo Paths for a Cordless Telephone 71 Figure A . 1 1 : Echo Control Devices in a DECT Cordless Telephone . 72 Figure A.12: TCLw and Artificial Echo Loss . 73 Figure B -1: Overview of th
40、e influence of the different input Parameters to the E-Model 76 Figure C.l: Echo Cancellers in a Private Network and their Echo Paths 89 Figure C.3a: Configurations and Transmission Characteristics for the Far-end Termination - Europe - . 94 Figure C.3b: Configurations and Transmission Characteristi
41、cs for the Far-end Termination - North America - 95 Rgure D.1: Basic Sucture of the Private Nehvork . 97 Figure A.13: Stability of a 4-wire Loop 74 Figure C.2: Access and Routing in Public Networks 91 Figure D.2: Reference Configuration 1 . 98 Figure D.3: Reference Configuration 2 . 99 Figure D.4: R
42、eference ConFiguration 3 . 99 Figure D.5: Use of Low Bit-rate Equipment for a Leased Line 102 Figure D.6: Basis for calculation of Reference Configuration 1 103 Figure D.7: Basis for Calculation of Reference Configuration 2 106 Figure D.8: Basis for Calculation of Reference Configuration 3 108 Figur
43、e D.9: Application of Echo Control Devices in the Private Network . 111 Figure D . 1 1: Reference Configuration 2 . 112 Figure D.12: Reference Configuration 3 . 113 Figure D.lO: Reference Configuration 1 . 112 Figure D.13: Basis for Calculation for Reference Configuration la . 114 Figure D.14: Basis
44、 for Calculation of Reference Configuration lb 118 Figure D.15: Basis for Calculation of Reference Configuration 2 122 Figure D.15a: Unlicensed: Wireless Processing Delay: 7ms avg . 125 Figure D.15b: Licensed: Wireless Processing Delay: 100 ms avg 126 Figure D.16: Basis for Calculation of Reference
45、Configuration 3a 127 Figure D.16a: Unlicensed Wireless Processing Delay: 7 ms avg 129 Figure D.16b: Licensed: Wireless Processing Delay: 100 ms avg . Figure D.17: Basis for Calculation of Reference Configuration 3b 131 Figure D.17a: Unlicensed: Wireless Processing Delay: 7 ms avg 133 Figure D.17b: L
46、icensed: Wireless Processing Delay: 100 ms avg 134 ETSI STD.ETSI EG 201 050-ENGL IWq 3400855 0376857 958 9 EG 201 050 V1.2.2 (199942) List of Tables Table la: Relation between Communication Quality and Total Impairment Value Itot (G. 113) 23 Table lb: Relation between Rating Factor ?R and User?s Sat
47、isfaction (G.175) 23 Table 2: Pianniig Values for the Equipment Impairment Factor Ie 30 Table 3: Provisional Examples for the Advantage Factor. A 30 Table 4 Assumed Analogue Access Characteristics 32 Table 5: Assumed Digital Access Charactenstics for Lines Terminated in Digital Sets . 32 Table 6: De
48、fault Vaiues and permitted Ranges for the Parameters . 50 Table C.l: Planning Values for Wireless Telephones - European Region 83 Table C.2 Planning Values for Wireless Telephones - North American Region . 83 Table C.3: Switching Equipment Connection Possibilities . 84 Table C.4: Average Values for
49、Ti3RLw and Echo Loss . 85 Table D.l: Summary of the Calculation Results . 109 Table D.2: EModel input Parameters for Configuration la 116 Table D.3: EModel input Parameters for Config lb . 120 Table D.4: E-Model Input Parameters for Config 2 . 124 Table D.5: E-Model Input Parameters for Config 3a (analogue set B) . 129 Table D.6: E-Model Input Parameters for Config 3b (digital set B) . 133 ETSI STD-ETSI EG 201 050-ENGL 1999 D 3400855 037bBLB 894 9 10 EQ 201 050 V1.2.2 (199902) Intellectual Property Rights IPRs essential or potentially essent
