ETSI ES 202 718 V1.1.1 (2011-10)

SLOVENSKI STANDARD
SIST ES 202 718 V1.1.1:2014
01-oktober-2014
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Speech and multimedia Transmission Quality (STQ) - Transmission Requirements for IP-
based Narrowband and Wideband Home Gateways and Other Media Gateways from a
QoS Perspective as Perceived by the User
Ta slovenski standard je istoveten z: ES 202 718 Version 1.1.1
ICS:
33.040.35 Telefonska omrežja Telephone networks
SIST ES 202 718 V1.1.1:2014 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ES 202 718 V1.1.1:2014

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SIST ES 202 718 V1.1.1:2014
ETSI ES 202 718 V1.1.1 (2011-10)






ETSI Standard
Speech and multimedia Transmission Quality (STQ);
Transmission Requirements for IP-based Narrowband and
Wideband Home Gateways and Other Media Gateways from a
QoS Perspective as Perceived by the User

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SIST ES 202 718 V1.1.1:2014
 2 ETSI ES 202 718 V1.1.1 (2011-10)



Reference
DES/STQ-00145
Keywords
QoS, speech
ETSI
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ETSI

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SIST ES 202 718 V1.1.1:2014
 3 ETSI ES 202 718 V1.1.1 (2011-10)
Contents
Intellectual Property Rights . 5
Foreword . 5
Introduction . 5
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 8
3 Definitions and abbreviations . 8
3.1 Definitions . 8
3.2 Abbreviations . 9
4 General considerations . 9
4.1 Default Coding Algorithm . 9
4.2 End-to-end considerations . 10
4.3 Parameters to be investigated . 10
4.3.1 Applicability of parameters to different MGWs . 10
5 Test equipment . 11
5.1 IP half channel measurement adaptor . 11
5.2 Environmental conditions for tests . 12
5.3 Accuracy of measurements and test signal generation . 12
5.4 Network impairment simulation . 12
6 Requirements and associated Measurement Methodologies . 13
6.1 Test setup. 13
6.1.1 Setup for Media Gateways with 4-wire interface . 14
6.1.2 Setup for Media Gateways with 2-wire interface . 14
6.1.3 Setup for Media Gateways with Wireless Access . 15
6.1.4 Setup for IP-to-IP Media Gateways . 15
6.1.5 Test Signal Levels . 16
6.1.6 Background noise simulation . 16
6.2 Coding independent parameters . 16
6.2.1 Send Frequency response . 16
6.2.2 Circuit Loudness Rating in Send . 17
6.2.3 Linearity Range for CLR (SND) . 18
6.2.4 Send Distortion . 19
6.2.5 Spurious Out-of-Band Signals in Send direction . 20
6.2.6 Send Noise . 20
6.2.7 Receive Frequency Response . 20
6.2.8 Circuit Loudness Rating in Receive . 21
6.2.9 Linearity Range for CLR (RCV) . 22
6.2.10 Receive Distortion . 23
6.2.11 Out-of-Band Signals Wideband to Narrowband Transcoding . 24
6.2.12 Spurious Out-of-band Signals Narrowband to Wideband Transcoding . 24
6.2.13 Minimum Activation Level and Sensitivity in Receive Direction . 25
6.2.14 Receive Noise . 25
6.2.15 Double Talk Performance . 26
6.2.15.1 Attenuation Range in Send Direction during Double Talk A . 26
H,S,dt
6.2.15.2 Attenuation Range in Receive Direction during Double Talk A . 28
H,R,dt
6.2.15.3 Detection of Echo Components during Double Talk . 29
6.2.15.4 Minimum Activation Level and Sensitivity of Double Talk Detection . 31
6.2.16 Switching Characteristics . 31
6.2.16.1 Activation in Send Direction . 31
6.2.16.2 Activation in Receive Direction . 32
ETSI

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6.2.16.3 Silence Suppression and Comfort Noise Generation . 33
6.2.17 Background Noise Performance . 33
6.2.17.1 Performance in Send Direction in the Presence of Background Noise . 33
6.2.17.2 Quality of Speech with Background Noise . 34
6.2.17.3 Quality of Background Noise Transmission (with Far End Speech) . 35
6.2.17.4 Quality of Background Noise Transmission (with Near End Speech) . 36
6.2.18 Quality of Echo Cancellation . 36
6.2.18.1 Echo paths . 36
6.2.18.2 Echo Performance According to ITU-T Recommendation G.168 . 37
6.2.18.3 Terminal Coupling Loss (TCLw) . 37
6.2.18.4 Temporal Echo Effects . 38
6.2.18.5 Spectral Echo Attenuation . 38
6.2.18.6 Occurrence of Artefacts . 39
6.2.19 Variant Impairments; Network dependant . 39
6.2.19.1 Clock Accuracy Send . 39
6.2.19.2 Clock Accuracy Receive . 39
6.2.19.3 Send Delay Variation . 40
6.2.19.4 Delay versus Time Receive . 40
6.2.19.5 Quality of Jitter buffer adjustment . 40
6.2.20 Immunity to DTMF False Detection in Send Direction . 40
6.3 Codec Specific Requirements. 41
6.3.1 Send Delay . 41
6.3.2 Receive delay . 42
6.3.3 Delay for IP-to-IP MGW . 44
6.3.4 Objective Listening Speech Quality MOS-LQO in Send direction . 44
6.3.5 Objective Listening Quality MOS-LQO in Receive direction . 45
6.3.5.1 Efficiency of Packet Loss Concealment (PLC) . 47
6.3.5.2 Efficiency of Delay Variation Removal . 47
Annex A (informative): Impulse Response of a Narrowband and Wideband DECT PP . 48
Annex B (normative): Test signal for immunity to DTMF false detection in send direction . 50
Annex C (informative): Bibliography . 51
History . 52

ETSI

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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://ipr.etsi.org).
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 ETSI Standard (ES) has been produced by ETSI Technical Committee Speech and multimedia Transmission
Quality (STQ).
Introduction
Traditionally, the 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
from an end-to-end perspective, including specifications for the edge points.
The present document covers IP-based narrowband and wideband home gateways and other media gateways. It aims to
enhance the interoperability and end-to-end quality.
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
mouth-to-ear transmission path.
ETSI

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 6 ETSI ES 202 718 V1.1.1 (2011-10)
1 Scope
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:
• ATA (Analogue Terminal Adapter), home gateway IP to POTS
• ITA (ISDN Terminal Adapter), home gateway IP to ISDN
• IAD (Integrated Access device), home router including ATA or ITA
• Network based ATA and ITA
• Carrier grade media gateway, network gateway IP to TDM
• IP-to-IP media gateway, network gateway with transcoding and/or other media processing
DECT interfaces of media gateways are excluded from the present document and should be measured according to the
relevant DECT standards.
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
differently.
The requirements available in the present document will ensure a high compatibility with IP-and TDM-based fixed and
wireless terminals and networks, including DECT and mobile terminals.
It is the aim to optimize interoperability, the listening and talking quality and the conversational performance. Related
requirements and test methods are defined in the present document.
The present document does not apply to media gateways with 4-wire analogue interfaces.
2 References
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
reference document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
2.1 Normative references
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
Rate (EFR) speech transcoding (GSM 06.60)".
[2] ETSI TS 126 171: "Digital cellular telecommunications system (Phase 2+); Universal Mobile
Telecommunications System (UMTS); AMR speech codec, wideband; General description
(3GPP TS 26.171 version 6.0.0 Release 6)".
[3] ITU-T Recommendation G.107: "The E-model, a computational model for use in transmission
planning".
ETSI

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[4] ITU-T Recommendation G.108: "Application of the E-model: A planning guide".
[5] ITU-T Recommendation G.109: "Definition of categories of speech transmission quality".
[6] ITU-T Recommendation G.100.1: "The use of the decibel and of relative levels in speechband
telecommunications".
[7] ITU-T Recommendation G.111: "Loudness Ratings (LRs) in an international connection".
[8] ITU-T Recommendation G.122: "Influence of national systems on stability and talker echo in
international connections".
[9] ITU-T Recommendation G.711: "Pulse code modulation (PCM) of voice frequencies".
[10] ITU-T Recommendation G.723.1: "Dual rate speech coder for multimedia communications
transmitting at 5.3 and 6.3 kbit/s".
[11] ITU-T Recommendation G.726: "40, 32, 24, 16 kbit/s Adaptive Differential Pulse Code
Modulation (ADPCM)".
[12] ITU-T Recommendation G.729: "Coding of speech at 8 kbit/s using conjugate-structure algebraic-
code-excited linear prediction (CS-ACELP)".
[13] ITU-T Recommendation G.729.1: "G.729-based embedded variable bit-rate coder: An 8-32 kbit/s
scalable wideband coder bitstream interoperable with G.729".
[14] ITU-T Recommendation G.1020: "Performance parameter definitions for quality of speech and
other voiceband applications utilizing IP networks".
[15] ITU-T Recommendation P.50: "Artificial voices".
[16] ITU-T Recommendation P.340: "Transmission characteristics and speech quality parameters of
hands-free terminals".
[17] ITU-T Recommendation P.501: "Test signals for use in telephonometry".
[18] ITU-T Recommendation P.502: "Objective test methods for speech communication systems using
complex test signals".
[19] ITU-T Recommendation P.862: "Perceptual evaluation of speech quality (PESQ): An objective
method for end-to-end speech quality assessment of narrow-band telephone networks and speech
codecs".
[20] ISO 3 (1973): "Preferred numbers - Series of preferred numbers".
[21] ITU-T Recommendation P.800.1: "Mean Opinion Score (MOS) terminology".
[22] 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
for short line interface".
[23] 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
Network Termination Point (NTP)".
[24] ITU-T Recommendation G.168: "Digital network echo cancellers".
[25] ITU-T Recommendation P.863: "Perceptual objective listening quality assessment".
[26] ITU-T Recommendation G.722: "7 kHz audio-coding within 64 kbit/s".
[27] ITU-T Recommendation G.722.1: "Low-complexity coding at 24 and 32 kbit/s for hands-free
operation in systems with low frame loss".
[28] ITU-T Recommendation G.722.2: "Wideband coding of speech at around 16 kbit/s using Adaptive
Multi-Rate Wideband (AMR-WB)".
ETSI

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[29] ITU-T Recommendation P.862.1: "Mapping function for transforming P.862 raw result scores to
MOS-LQO".
2.2 Informative references
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI EG 202 396-1: "Speech and multimedia Transmission Quality (STQ); Speech quality
performance in the presence of background noise; Part 1: Background noise simulation technique
and background noise database".
[i.2] ETSI EG 202 425: "Speech Processing, Transmission and Quality Aspects (STQ); Definition and
implementation of VoIP reference point".
[i.3] 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 -
Objective test methods".
[i.4] IETF RFC 2833: "RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals".
[i.5] IETF RFC 4733: "RTP Payload for DTMF Digits, Telephony Tones, and Telephony Signals".
[i.6] ETSI TR 102 927: "Speech and multimedia Transmission Quality (STQ); Packet Loss
Concealment (PLC) performance measurement setup for home networks".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
0dBr point: reference point always located at the digital side of the gateway, for IP-IP gateways located at the input of
the MGW under test
NOTE: See ITU-T Recommendation G.100.1 [6].
2-wire interface: in the context of the present document, the telephony analogue interface over 2-wires used in the
local loop
4-wire interface: in the context of the present document, a 4-wire digital interface with separate channels for both
directions, irrespective of the physical transmission technology
codec: combination of an analogue-to-digital encoder and a digital-to-analogue decoder operating in opposite directions
of transmission in the same equipment
Composite Source Signal (CSS): signal composed in time by various signal elements
MGW with 2-wire interface: MGW with an analogue 2-wire interface (ATA)
MGW with 4-wire interface: MGW with only 4-wire interfaces, e.g. ITA, IP-to-IP and wireless access points
nominal setting of the volume control: when a receive volume control is provided, the setting which is closest to the
nominal RLR of 2 dB
receive direction: the direction from packet switched interfaces towards a synchronous interface (e.g. ISDN, analogue)
or between two packet switched interfaces (for media gateways with packet switched transport on only one side)
NOTE: For media gateways with packet switched transport on both sides (IP-to-IP-MGW), the requirements of
the receive direction have to be applied in both directions.
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receive interface: interface in the measurement setup, where a receive signal is injected and/or a send signal is
measured.
send direction: direction from a synchronous interface (e.g. ISDN, analogue) towards a packet switched interface (for
media gateways with packet switched interface on only one side)
NOTE: For media gateways with packet switched interfaces on both sides the requirements of the send direction
are not relevant.
send interface: interface in the measurement setup, where a send signal is injected and/or a receive signal is measured
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ATA Analogue Terminal Adapter
CLR Circuit Loudness Rating
CSS Composite Source Signal
DSL Digital Subscriber Line
DSLAM Digital Subscriber Line Access Multiplexer
DTMF Dual Tone Multi Frequency
EL Echo Loss
IAD Integrated Access device
IP Internet Protocol
ITA ISDN Terminal Adapter
JLR Junction Loudness Rating
MGW Media GateWay
MOS-LQOy Mean Opinion Score - Listening Quality Objective
NOTE: See ITU-T Recommendation P.800.1 [21].
NLP Non Linear Processor
PCM Pulse Code Modulation
PESQ™ Perceptional Evaluation of Speech Quality™
PLC Packet Loss Concealment
PN Pseudo-random Noise
POI Point Of Interconnect
POTS Plain Old Telephone Service
PSTN Public Switched Telephone Network
QoS Quality of Service
TCL Terminal Coupling Loss
TCN Trace Control for Netem™
TDM Time Division Multiplexing
VAD Voice Activity Detection
VoIP Voice over Internet Protocol
4 General considerations
4.1 Default Coding Algorithm
Narrowband VoIP gateways shall support the coding algorithm according to ITU-T Recommendation G.711 [9] (both
µ-law and A-law). VoIP gateways may support other coding algorithms.
Wideband VoIP gateways shall support the coding algorithm according to ITU-T Recommendation G.722 [26]. VoIP
gateways may support other coding algorithms.
NOTE: Associated Packet Loss Concealment (PLC) e.g. as defined in ITU-T Recommendation G.711 [9]
appendix I should be used.
ETSI

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4.2 End-to-end considerations
In order to achieve a desired end-to-end speech transmission performance (mouth-to-ear) it is r
...