SIST ES 202 718 V1.4.1:2020

SLOVENSKI STANDARD
SIST ES 202 718 V1.4.1:2020
01-julij-2020
Kakovost prenosa govora in večpredstavnih vsebin (STQ) - Prenosne zahteve za
ozkopasovne in širokopasovne domače prehode in omrežne medijske prehode po
protokolu IP glede na kakovost storitev (QoS), kot jo dojema uporabnik
Speech and multimedia Transmission Quality (STQ) - Transmission Requirements for
IP-based Narrowband and Wideband Home and Network Media Gateways from a QoS
Perspective as Perceived by the User
Ta slovenski standard je istoveten z: ETSI ES 202 718 V1.4.1 (2020-05)
ICS:
33.040.35 Telefonska omrežja Telephone networks
SIST ES 202 718 V1.4.1:2020 en

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

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Intellectual Property Rights ................................................................................................................................ 5

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

Modal verbs terminology .................................................................................................................................... 5

Introduction ........................................................................................................................................................ 5

1 Scope ........................................................................................................................................................ 6

2 References ................................................................................................................................................ 6

2.1 Normative references ......................................................................................................................................... 6

2.2 Informative references ........................................................................................................................................ 8

3 Definition of terms, symbols and abbreviations ....................................................................................... 8

3.1 Terms .................................................................................................................................................................. 8

3.2 Symbols .............................................................................................................................................................. 9

3.3 Abbreviations ..................................................................................................................................................... 9

4 General considerations ........................................................................................................................... 10

4.1 Default Coding Algorithm ................................................................................................................................ 10

4.2 End-to-end considerations ................................................................................................................................ 11

4.3 Parameters to be investigated ........................................................................................................................... 11

4.3.1 Applicability of parameters to different MGWs ......................................................................................... 11

5 Test equipment ....................................................................................................................................... 13

5.1 IP half channel measurement adaptor ............................................................................................................... 13

5.2 Environmental conditions for tests ................................................................................................................... 13

5.3 Accuracy of measurements and test signal generation ..................................................................................... 13

5.4 Network impairment simulation ....................................................................................................................... 13

6 Requirements and associated Measurement Methodologies .................................................................. 14

6.0 General ............................................................................................................................................................. 14

6.1 Test setup.......................................................................................................................................................... 14

6.1.0 General ........................................................................................................................................................ 14

6.1.1 Setup for Media Gateways with 4-wire interface ....................................................................................... 15

6.1.2 Setup for Media Gateways with 2-wire interface ....................................................................................... 16

6.1.3 Setup for Media Gateways with Wireless Access ....................................................................................... 16

6.1.4 Setup for IP-to-IP Media Gateways ............................................................................................................ 17

6.1.5 Test Signal Levels ....................................................................................................................................... 17

6.1.6 Background noise simulation ...................................................................................................................... 17

6.1.7 Echo paths ................................................................................................................................................... 18

6.2 Coding independent parameters ....................................................................................................................... 19

6.2.1 Send Frequency response ............................................................................................................................ 19

6.2.2 Circuit Loudness Rating in Send ................................................................................................................ 20

6.2.3 Linearity Range for CLR (SND) ................................................................................................................. 20

6.2.4 Send Distortion ........................................................................................................................................... 21

6.2.5 Spurious Out-of-Band Signals in Send direction ........................................................................................ 22

6.2.6 Send Noise .................................................................................................................................................. 22

6.2.7 Receive Frequency Response ..................................................................................................................... 23

6.2.8 Circuit Loudness Rating in Receive ........................................................................................................... 24

6.2.9 Linearity Range for CLR (RCV) ................................................................................................................ 24

6.2.10 Receive Distortion ...................................................................................................................................... 26

6.2.11 Out-of-Band Signals Wideband to Narrowband Transcoding .................................................................... 26

6.2.12 Spurious Out-of-band Signals Narrowband to Wideband Transcoding ...................................................... 27

6.2.13 Minimum Activation Level and Sensitivity in Receive Direction .............................................................. 28

6.2.14 Receive Noise ............................................................................................................................................. 28

6.2.15 Double Talk Performance ........................................................................................................................... 28

6.2.15.0 General .................................................................................................................................................. 28

6.2.15.1 Attenuation Range in Send Direction during Double Talk A ......................................................... 29

6.2.15.2 Attenuation Range in Receive Direction during Double Talk A .................................................... 30

6.2.15.3 Detection of Echo Components during Double Talk ............................................................................ 31

6.2.15.4 Minimum Activation Level and Sensitivity of Double Talk Detection ................................................ 33

6.2.16 Switching Characteristics ........................................................................................................................... 33

6.2.16.0 General .................................................................................................................................................. 33

6.2.16.1 Activation in Send Direction ................................................................................................................. 33

6.2.16.2 Activation in Receive Direction ............................................................................................................ 34

6.2.16.3 Silence Suppression and Comfort Noise Generation ............................................................................ 35

6.2.17 Background Noise Performance ................................................................................................................. 35

6.2.17.0 General .................................................................................................................................................. 35

6.2.17.1 Performance in Send Direction in the Presence of Background Noise ................................................. 35

6.2.17.2 Quality of Speech with Background Noise ........................................................................................... 36

6.2.17.3 Quality of Background Noise Transmission (with Far End Speech) .................................................... 37

6.2.17.4 Quality of Background Noise Transmission (with Near End Speech) .................................................. 37

6.2.18 Quality of Echo Cancellation ...................................................................................................................... 38

6.2.18.0 General .................................................................................................................................................. 38

6.2.18.1 Echo Performance According to Recommendation ITU-T G.168 ........................................................ 38

6.2.18.2 Terminal Coupling Loss (TCLw, NB) .................................................................................................. 38

6.2.18.3 Terminal Coupling Loss (TCL, WB) .................................................................................................... 39

6.2.18.4 Temporal Echo Effects .......................................................................................................................... 39

6.2.18.5 Spectral Echo Attenuation ..................................................................................................................... 40

6.2.18.6 Occurrence of Artefacts ........................................................................................................................ 41

6.2.18.7 Variable Echo Paths .............................................................................................................................. 41

6.2.19 Variant Impairments ................................................................................................................................... 41

6.2.19.1 Clock Accuracy Send ............................................................................................................................ 41

6.2.19.2 Clock Accuracy Receive ....................................................................................................................... 41

6.2.19.3 Send Packet Delay Variation................................................................................................................. 42

6.2.20 Immunity to DTMF False Detection in Send Direction .............................................................................. 42

6.2.21 Send and receive delay - round trip delay ................................................................................................... 43

6.3 Codec Specific Requirements........................................................................................................................... 44

6.3.1 Objective Listening Speech Quality MOS-LQO in Send direction ............................................................ 44

6.3.2 Objective Listening Quality MOS-LQO in Receive direction .................................................................... 45

6.3.3 Quality of Jitter buffer adjustment .............................................................................................................. 47

Annex A (informative): Impulse Response of a Narrowband and Wideband DECT PP ................ 49

Annex B (normative): Test signal for immunity to DTMF false detection in send direction ........ 51

Annex C (informative): Example IP Delay variation for jitterbuffer quality measurements ......... 52

Annex D (informative): Bibliography ................................................................................................... 53

History .............................................................................................................................................................. 54

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This ETSI Standard (ES) has been produced by ETSI Technical Committee Speech and multimedia Transmission

In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and

"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of

"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

Traditionally, analogue and digital telephones were interfacing switched-circuit 64 kbit/s PCM networks. With the fast

growth of IP networks, packet-switched networks (VoIP) interfacing PSTN networks and mobile networks, as well as

different types of IP-terminals, are being rapidly introduced. Different types of gateways are used to interconnect to

such IP networks. Since the IP networks will be in many cases interworking with the traditional PSTN and private

networks, many of the basic transmission requirements have to be harmonized between these different types of network

The present document covers IP-based narrowband and wideband home and network media gateways. It aims to

In contrast to other standards which define minimum performance requirements, it is the intention of the present

document to specify gateway equipment requirements which enable manufacturers and service providers to enable

end-to-end speech performance as perceived by the user. These requirements are absolutely necessary to ensure a good

quality, but they are not sufficient. They have to be combined with requirements (and associated relevant measurement

methods) for other elements in the transmission chain (core IP network, PSTN, terminals), as well as for the whole

The present document provides speech transmission performance requirements for narrowband and wideband media

gateways from a QoS perspective as perceived by the user. Media gateways can be network or home based, they may

include a transcoding function. The present document covers the following types of IP-based media gateways:

• IP-to-IP media gateway, network gateway with transcoding and/or other media processing

• New Generation DECT Fixed part with IP interface (only parameters not covered by New Generation DECT)

Interfaces of media gateways used together with terminals as a system (i.e. connected via Ethernet or with a proprietary

interface) are excluded in the present document and should be measured according to the relevant terminal standard.

If a media gateway includes more than one interface type (e.g. POTS and ISDN), each interface has to be dealt with

The requirements available in the present document will ensure a high compatibility with IP- and TDM-based fixed and

It is the aim to optimize interoperability, the listening and talking quality and the conversational performance. Related

The present document does not apply to media gateways with 4-wire analogue interfaces.

The requirements for MGWs with respect to voiceband data (VBD) are out of scope in the present document. These

References are either specific (identified by date of publication and/or edition number or version number) or

non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the

Referenced documents which are not found to be publicly available in the expected location might be found at

NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee

The following referenced documents are necessary for the application of the present document.

[1] ETSI EN 300 726: "Digital cellular telecommunications system (Phase 2+) (GSM); Enhanced Full

[2] ETSI TS 126 171 (V6.0.0): "Digital cellular telecommunications system (Phase 2+); Universal

Mobile Telecommunications System (UMTS); AMR speech codec, wideband; General description

[3] Recommendation ITU-T G.107: "The E-model, a computational model for use in transmission

[4] Recommendation ITU-T G.108, including amendments 1 and 2: "Application of the E-model:

[5] Recommendation ITU-T G.109: "Definition of categories of speech transmission quality".

[6] Recommendation ITU-T G.100.1: "The use of the decibel and of relative levels in speechband

[7] Recommendation ITU-T G.111: "Loudness Ratings (LRs) in an international connection".

[8] Recommendation ITU-T G.122: "Influence of national systems on stability and talker echo in

[9] Recommendation ITU-T G.711: "Pulse code modulation (PCM) of voice frequencies".

[10] Recommendation ITU-T G.723.1: "Dual rate speech coder for multimedia communications

[11] Recommendation ITU-T G.726: "40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code

[12] Recommendation ITU-T G.729: "Coding of speech at 8 kbit/s using conjugate-structure algebraic-

[13] Recommendation ITU-T G.729.1: "G.729-based embedded variable bit-rate coder: An 8-32 kbit/s

[14] Recommendation ITU-T P.863.1: "Application guide for Recommendation ITU-T P.863".

[15] Recommendation ITU-T P.340: "Transmission characteristics and speech quality parameters of

[17] Recommendation ITU-T P.502: "Objective test methods for speech communication systems using

[19] IEC 61260-1: "Electroacoustics - Octave-band and fractional-octave-band filters - Part 1:

[21] ETSI TS 102 971: "Access and Terminals (AT); Public Switched Telephone Network (PSTN);

Harmonized specification of physical and electrical characteristics of a 2-wire analogue interface

[22] ETSI ES 201 970: "Access and Terminals (AT); Public Switched Telephone Network (PSTN);

Harmonized specification of physical and electrical characteristics at a 2-wire analogue presented

[24] Recommendation ITU-T P.863: "Perceptual objective listening quality prediction".

[26] Recommendation ITU-T G.722.1: "Low-complexity coding at 24 and 32 kbit/s for hands-free

[27] Recommendation ITU-T G.722.2: "Wideband coding of speech at around 16 kbit/s using Adaptive

[28] Recommendation ITU-T P.1010: "Fundamental voice transmission objectives for VoIP terminals

[31] TIA-920.130-B: "Telecommunications Communications Products Transmission Requirements for

[32] ETSI ES 202 737: "Speech and multimedia Transmission Quality (STQ); Transmission

requirements for narrowband VoIP terminals (handset and headset) from a QoS perspective as

[33] ETSI TS 103 224: "Speech and multimedia Transmission Quality (STQ); A sound field

References are either specific (identified by date of publication and/or edition number or version number) or

non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the

NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee

The following referenced documents are not necessary for the application of the present document but they assist the

[i.1] ETSI EG 202 425: "Speech Processing, Transmission and Quality Aspects (STQ); Definition and

[i.2] IETF RFC 2833: "RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals".

[i.3] IETF RFC 4733: "RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals".

[i.4] ETSI TS 102 929: "Speech and multimedia Transmission Quality (STQ); Procedures for the

identification and selection of common modes of de-jitter buffers and echo cancellers".

NOTE: Information available at https://wiki.linuxfoundation.org/networking/netem.

[i.8] ETSI EG 202 396-3: "Speech and multimedia Transmission Quality (STQ); Speech Quality

performance in the presence of background noise Part 3: Background noise transmission -

0dBr point: reference point always located at the digital side of the gateway, for IP-to-IP gateways located at the input

2-wire interface: in the context of the present document, telephony analogue interface over 2-wires used in the local

4-wire interface: 4-wire digital interface with separate channels for both directions, irrespective of the physical

codec: combination of an analogue-to-digital encoder and a digital-to-analogue decoder operating in opposite directions