SIST I-ETS 300 302-3 E1:2003
(Main)Integrated Services Digital Network (ISDN); Videotelephony teleservice; Part 3: Audio aspects - wideband handset
General Information
- Abstract
Standardization of electroacoustical characteristics of videotelephony terminals for Integrated Services Digital (ISDN using wideband (CCITT G.722) coding and handset functions.
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
Overview
SIST I-ETS 300 302-3 E1:2003 specifies the audio requirements for wideband handsets used in videotelephony terminals operating over the Integrated Services Digital Network (ISDN). Developed by SIST, this standard covers electroacoustic characteristics for terminal equipment designed for the ISDN videotelephony teleservice utilizing wideband audio coding according to CCITT G.722. The focus is on ensuring high quality audio performance-particularly for real-time audiovisual communication-by addressing parameters such as distortion, coupling loss, noise, and synchronization for wideband (7 kHz) handsets.
Key Topics
- Electroacoustic Characteristics: Establishes minimum thresholds for handset terminal performance, with special emphasis on wideband audio signal integrity for videotelephony over ISDN.
- Wideband Audio (G.722) Coding: Adopts Adaptive Differential Pulse Code Modulation (ADPCM) conforming to CCITT Recommendation G.722, allowing for 7 kHz audio bandwidth-significantly improving audio quality compared to traditional narrowband speech.
- Terminal Coupling Loss: Specifies weighted coupling loss levels to guarantee minimal interference and optimal acoustic separation between input and output paths.
- Distortion and Noise Parameters: Defines acceptable Signal-to-Distortion (S/D) ratios for both sending and receiving, as well as maximum allowable noise, to maintain call clarity and intelligibility.
- Delay and Synchronization: Addresses requirements related to audio delay and lip synchronization to ensure seamless integration with the video stream during calls.
Applications
SIST I-ETS 300 302-3 E1:2003 is crucial for:
- ISDN Videotelephony Terminals: Manufacturers of videotelephony hardware for ISDN environments must comply with these audio performance specifications to ensure compatibility and user satisfaction.
- Telecommunication Service Providers: Operators deploying or maintaining ISDN-based video call services rely on standardized endpoints for consistent service quality.
- Quality Assurance & Testing: Test laboratories use this standard to benchmark audio performance, covering aspects such as terminal coupling loss, signal distortion, and noise across a wide range of operational scenarios.
- Product Design & Certification: Ensures interoperability and consistent user experience by defining measurable and repeatable handset characteristics, facilitating certification and market acceptance of ISDN videotelephony equipment.
Related Standards
To ensure holistic compliance and interoperability, the following standards are relevant:
- CCITT Recommendation G.722: "7 kHz audio coding within 64 kbit/s," the foundation for wideband audio coding in ISDN videotelephony.
- I-ETS 300 245-5: "Technical characteristics for telephony terminals; Part 5: Wide band (7 kHz) handset telephony"-reference for general handset audio requirements.
- ETS 300 264: Service description for the ISDN videotelephony teleservice.
- ETS 300 111 and 300 263: Define the framework for 3.1 kHz and 7 kHz ISDN telephony services, ensuring compatibility.
- I-ETS 300 302-1: Addresses electroacoustic properties for telephony function using PCM.
- ITU-T H.261: Specifies video encoding for audiovisual telecommunications.
Practical Value
Adherence to SIST I-ETS 300 302-3 E1:2003 advances the deployment of high-quality ISDN videotelephony by providing clear benchmarks for audio performance. This leads to:
- Enhanced User Experience: Higher speech intelligibility and clearer conversations through wideband audio.
- Reduced Interference: Proper terminal coupling loss settings minimize acoustic feedback and crosstalk, supporting longer and more comfortable calls.
- Consistent Synchronization: Alignment of audio and video streams enhances the realism and usability of videotelephony services.
- Interop and Market Access: Facilitates the development of ISDN terminals capable of seamless operation in multi-vendor and cross-border telecommunication networks.
For manufacturers, network operators, and certification bodies, this standard is a key reference for delivering modern, interoperable ISDN videotelephony solutions.
Get Certified
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ANCE
Mexican certification and testing association.
Intertek Slovenia
Intertek testing, inspection, and certification services in Slovenia.
LNE (Laboratoire National de Métrologie et d'Essais)
French national laboratory for metrology and testing.
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Frequently Asked Questions
SIST I-ETS 300 302-3 E1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Integrated Services Digital Network (ISDN); Videotelephony teleservice; Part 3: Audio aspects - wideband handset". This standard covers: Standardization of electroacoustical characteristics of videotelephony terminals for Integrated Services Digital (ISDN using wideband (CCITT G.722) coding and handset functions.
Standardization of electroacoustical characteristics of videotelephony terminals for Integrated Services Digital (ISDN using wideband (CCITT G.722) coding and handset functions.
SIST I-ETS 300 302-3 E1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.080 - Integrated Services Digital Network (ISDN). The ICS classification helps identify the subject area and facilitates finding related standards.
SIST I-ETS 300 302-3 E1:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2003
Digitalno omrežje z integriranimi storitvami (ISDN) – Daljinske storitve:
videotelefonija – 3. del: Zvokovni vidiki – Širokopasovna pogovorka
Integrated Services Digital Network (ISDN); Videotelephony teleservice; Part 3: Audio
aspects - wideband handset
Ta slovenski standard je istoveten z: I-ETS 300 302-3 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
INTERIM
EUROPEAN I-ETS 300 302-3
TELECOMMUNICATION September 1996
STANDARD
Source: ETSI TC-TE Reference: DI/TE-04008.3
ICS: 33.080
Key words: ISDN, videotelephony terminal, audio, 7 kHz
Integrated Services Digital Network (ISDN);
Videotelephony teleservice;
Part 3: Audio aspects - wideband handset
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.fr
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16
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.
© European Telecommunications Standards Institute 1996. All rights reserved.
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I-ETS 300 302-3: September 1996
Whilst 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.
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I-ETS 300 302-3: September 1996
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .7
3.1 Definitions .7
3.2 Abbreviations .8
4 Requirements.8
4.1 General .8
4.2 Terminal Coupling Loss .8
4.3 Distortion.9
4.3.1 Sending .9
4.3.2 Receiving.9
4.4 Noise.10
4.4.1 Sending .10
4.4.2 Receiving.10
4.5 Delay.10
4.6 Lip synchronisation .10
Annex A (informative): Bibliography.11
History.12
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I-ETS 300 302-3: September 1996
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I-ETS 300 302-3: September 1996
Foreword
Part 3 of this Interim European Telecommunication Standard (I-ETS) has been produced by the Terminal
Equipment (TE) Technical Committee of the European Telecommunications Standards Institute (ETSI).
An ETSI standard may be given I-ETS status either because it is regarded as a provisional solution ahead
of a more advanced standard, or because it is immature and requires a "trial period". The life of an I-ETS
is limited to three years after which it can be converted into an ETS, have it's life extended for a further
two years, be replaced by a new version, or be withdrawn.
This I-ETS is part 3 of a multipart standard covering "Integrated Services Digital Network (ISDN);
Videotelephony teleservice", as described below.
Part 1: "Electroacoustic characteristics for handset telephony function when using Pulse Code
Modulation encoding".
Part 2: "Audio aspects - Pulse Code Modulation (PCM) A-law loudspeaking and handsfree".
Part 3: "Audio aspects - wideband handset".
Part 4: "Audio aspects - wideband coding and loudspeaking or handsfree function".
Proposed announcement date
Date of adoption of this I-ETS: 23 August 1996
Date of latest announcement of this I-ETS (doa): 31 December 1996
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I-ETS 300 302-3: September 1996
Blank page
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I-ETS 300 302-3: September 1996
1 Scope
This Interim European Telecommunication Standard (I-ETS) specifies the electroacoustic characteristics
for handset functions implemented in videotelephony terminals intended for use in the videotelephone
teleservice in the Integrated Services Digital Network (ISDN) using Adaptive Differential Pulse Code
Modulation (ADPCM) encoding according to CCITT Recommendation G.722 [1]. Those terminals will be
connected to the basic access of the coincident S and T reference point of the ISDN.
The videotelephony teleservice in the ISDN is defined in ETS 300 264 (see annex A).
The requirements of this I-ETS specify those characteristics which deviate from those of an ISDN 7 kHz
telephony terminal. Those deviations are due to conditions which are special for videotelephony
applications (e.g. delay, measurement position). The corresponding requirements for an ISDN 7 kHz
telephony handset terminal can be found in I-ETS 300 245-5 [2].
2 Normative references
This I-ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this I-ETS only when incorporated in it by amendment or revision. For undated references the
latest edition of the publication referred to applies.
[1] CCITT Recommendation G.722 (1990): "7 kHz audio coding within 64 kbit/s".
[2] I-ETS 300 245-5 (1995): "Technical characteristics for telephony terminals; Part
5: Wide band (7 kHz) handset telephony".
[3] I-ETS 300 302-1 (1994): "Integrated Services Digital Network (ISDN);
Videotelephony teleservice; Part 1: Electroacoustic characteristics for telephony
function when using Pulse Code Modulation (PCM) encoding".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this part of the I-ETS, the relevant definitions in CCITT Recommendations P.10 and
G.7
...