SIST I-ETS 300 245-8 E1:2003
(Main)Integrated Services Digital Network (ISDN); Technical characteristics of telephony terminals; Part 8: Speech transmission characteristics when using Low-Delay Code-Excited Linear Prediction (LD-CELP) coding at 16 kbit/s
General Information
- Abstract
Specification of characteristics for digital telephony terminals using the 16 kbit/s speech coding algorithm currently being developed by ITU TS (previously CCITT) under Q21/15 (previously Q21/XV).
- 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 300 245-8 E1:2003 is a Slovenian standard that specifies the technical characteristics for telephony terminals operating on the Integrated Services Digital Network (ISDN), particularly focusing on speech transmission when using Low-Delay Code-Excited Linear Prediction (LD-CELP) speech coding at 16 kbit/s.
This standard aligns with international recommendations, especially ITU-T G.728, and outlines the necessary requirements to ensure high-quality speech communication in digital environments where efficient bandwidth use and low transmission delay are critical. The specifications apply to terminals operating at the ISDN basic access S and T reference points and are intended to guarantee effective interoperability and performance within digital telephony networks.
Key Topics
- ISDN Telephony Terminals: Focuses on digital telephony devices configured for ISDN basic access.
- Speech Coding Algorithm: Specifies the use of LD-CELP at 16 kbit/s, as defined in ITU-T G.728, which is known for its low algorithmic delay and efficiency.
- Transmission Characteristics: Addresses requirements for sending and receiving loudness, speech delay, and performance under different modes, such as handset and loudspeaking.
- Conformance Testing: Includes test specifications for evaluating transmission delay and loudness ratings, ensuring terminals meet expected audio performance.
- Compatibility and Interfacing: Clarifies default PCM A-law encoding (G.711) interoperability and interfaces for test equipment.
Applications
The guidelines provided in SIST I-ETS 300 245-8 E1:2003 are crucial for:
- Manufacturers of ISDN Telephony Terminals: Ensuring that new devices support LD-CELP speech coding while maintaining acceptable speech quality and compatibility with existing network infrastructure.
- Telecommunications Service Providers: Evaluating and certifying telephony devices for network deployment to optimize bandwidth usage and maintain consistent end-user experience.
- Test Laboratories: Performing standardized measurement of loudness ratings, transmission performance, and conformance to ensure product compliance.
- Network Equipment Integrators: Supporting the deployment of voice terminals with advanced coding techniques for improved network efficiency.
Practical benefits include reduced end-to-end delay for voice services, efficient network resource use, and consistent voice quality across diverse digital terminal devices in ISDN environments.
Related Standards
To ensure comprehensive compliance and interoperability, the following references are essential in conjunction with SIST I-ETS 300 245-8 E1:2003:
- ITU-T Recommendation G.728: Defines the LD-CELP speech coding algorithm.
- I-ETS 300 245-1: General technical characteristics for ISDN telephony terminals.
- I-ETS 300 245-2: Speech transmission characteristics with PCM A-law encoding for handsets.
- I-ETS 300 245-3: Speech transmission characteristics for loudspeaking and hands-free terminals.
- CCITT G.711: PCM of voice frequencies, default encoding for ISDN terminals.
- ETSI ETS 300 144: Frame structure for audiovisual services over ISDN.
- TBR 3: ISDN attachment requirements for terminal equipment.
- IEC 651, ITU-T P.51, ITU-T P.57: Equipment and measurement standards for electro-acoustic tests.
Conclusion
Implementing SIST I-ETS 300 245-8 E1:2003 supports consistent quality and interoperability for ISDN digital telephony terminals utilizing LD-CELP speech coding. By adhering to these technical specifications, manufacturers and service providers can deliver reliable, efficient, and high-quality voice communication within digital integrated networks. This standard is an important reference for enhancing digital telephony infrastructure and ensuring future-ready communications solutions.
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Frequently Asked Questions
SIST I-ETS 300 245-8 E1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Integrated Services Digital Network (ISDN); Technical characteristics of telephony terminals; Part 8: Speech transmission characteristics when using Low-Delay Code-Excited Linear Prediction (LD-CELP) coding at 16 kbit/s". This standard covers: Specification of characteristics for digital telephony terminals using the 16 kbit/s speech coding algorithm currently being developed by ITU TS (previously CCITT) under Q21/15 (previously Q21/XV).
Specification of characteristics for digital telephony terminals using the 16 kbit/s speech coding algorithm currently being developed by ITU TS (previously CCITT) under Q21/15 (previously Q21/XV).
SIST I-ETS 300 245-8 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 300 245-8 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
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Integrated Services Digital Network (ISDN); Technical characteristics of telephony
terminals; Part 8: Speech transmission characteristics when using Low-Delay Code-
Excited Linear Prediction (LD-CELP) coding at 16 kbit/s
Ta slovenski standard je istoveten z: I-ETS 300 245-8 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 300 245-8
TELECOMMUNICATION January 1996
STANDARD
Source: ETSI TC-TE Reference: T/TE 10-07(H)
ICS: 33.080
ISDN, telephony terminals, LD-CELP coding
Key words:
Integrated Services Digital Network (ISDN);
Technical characteristics of telephony terminals;
Part 8: Speech transmission characteristics when using
Low-Delay Code-Excited Linear Prediction (LD-CELP)
coding at 16 kbit/s
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - secretariat@etsi.fr
X.400: Internet:
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 300 245-8: January 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 300 245-8: January 1996
Contents
Foreword .5
Introduction.5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .8
3.1 Definitions .8
3.2 Abbreviations .8
4 Call control function.8
5 Speech transmission characteristics.8
5.1 General .8
5.1.1 Default speech encoding.8
5.1.2 LD-CELP speech encoding.9
5.1.3 Relative level .9
5.1.4 Volume control .9
5.2 Speech performance characteristics .9
5.2.1 Introduction.9
5.2.2 Sensitivity .9
5.2.2.1 Sending.9
5.2.2.2 Receiving.9
5.2.3 Acoustic shock .9
5.2.4 Delay .10
6 Power feeding .10
6.1 General conditions.10
7 Physical modules .10
7.1 Handset.10
7.2 Audible alerting module .10
Annex A (normative): Test specifications.11
A.1 General conditions for testing.11
A.1.1 Environment for tests.11
A.1.2 Power supply limitations .11
A.1.3 Test signals.11
A.1.4 Test equipment interface .11
A.1.4.1 General.11
A.1.4.2 Access to 16 kbit/s bitstream .11
A.1.5 Test equipment requirements.11
A.1.5.1 Electro-acoustic equipment.11
A.1.5.2 Test equipment for the digital interface .12
A.1.5.2.1 General.12
A.1.5.2.2 Codec specification .12
A.1.5.2.3 Analogue interface.12
A.1.5.2.4 Definition of 0 dBr point .13
A.1.5.2.5 Direct digital processing approach .13
A.1.6 Accuracy of calibrations.13
A.2 Speech transmission requirements testing .13
A.2.1 Delay.13
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I-ETS 300 245-8: January 1996
Annex B (informative): Bibliography . 15
History. 16
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I-ETS 300 245-8: January 1996
Foreword
Part 8 of this Interim European Telecommunication Standard (I-ETS) was produced by the Terminal
Equipment (TE) Technical Committee of the European Telecommunications Standards Institute (ETSI).
An ETSI draft standard may be given I-ETS status as it is regarded either 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, at first, to three years after which it can be converted into a full European Telecommunication
Standard (ETS), have its life extended for a further two years, be replaced by a new version of the I-ETS
or, finally, be withdrawn.
This is the eighth Part of an I-ETS which comprises eight Parts:
Part 1: General.
Part 2: PCM A-law, handset telephony.
Part 3: Pulse Code Modulation (PCM) A-law, loudspeaking and hands free telephony.
Part 4: Interface for additional equipment.
Part 5: Wideband (7 kHz) handset telephony.
.
Part 6: Wideband (7 kHz), loudspeaking and hands free telephony.
Part 7: Locally generated information tones.
Part 8: Speech transmission characteristics when using Low-Delay Code-Excited Linear
Prediction (LD-CELP) coding at 16 kbit/s.
Proposed announcement date
Date of adoption of this I-ETS: 12 January 1996
Date of latest announcement of this I-ETS (doa): 30 April 1996
Introduction
The speech coding algorithm specified in CCITT Recommendation G.728 [1] is based on a digital
bitstream encoded according to CCITT Recommendation G.711 [3]. The terminal applications of the
CCITT Recommendation G.728 [1] algorithm are based on the framing structure specified in ETS 300 144
[8]. These terminals will be able to work in mode a0, i.e. using CCITT Recommendation G.711 [3]
encoding. The characteristics to be specified in this I-ETS can therefore be verified by:
- testing the audio characteristics of the terminal when it is working in mode a0;
- verifying that the speech coding algorithm is conforming to CCITT Recommendation G.728 [1].
The characteristics specified in this I-ETS are based on the principle where a limited number are specified
to test the overall characteristics of a terminal where the CCITT Recommendation G.728 [1] algorithm is
implemented.
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I-ETS 300 245-8: January 1996
Blank page
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I-ETS 300 245-8: January 1996
1 Scope
Part 8 of this I-ETS specifies the technical characteristics for telephony terminals to be used at the basic
access for the coincident S and T reference point of the Integrated Services Digital Network (ISDN) when
using Low-Delay Code-Excited Linear Prediction (LD-CELP) coding at 16 kbit/s as specified in CCITT
Recommendation G.728 [1]. This Part applies in conjunction with I-ETS 300 245-1 [2].
The input and output bitstreams to and from the LD-CELP are encoded using the Pulse Code Modulation
(PCM) A-law encoding specified in CCITT Recommendation G.711 [3]. The speech transmission
characteristics of a handset terminal when using PCM A-law encoding are specified in I-ETS 300 245-2
[4], and the speech transmission characteristics of a hands free or loudspeaking terminal when using
PCM A-law are specified in I-ETS 300 245-3 [5]. The requirements of this Part are restricted to the
minimum set of characteristics where the implementation of the LD-CELP codec may influence the
speech transmission characteristics.
The present version of this Part does not cover measurements on receivers (in handsets) with low
acoustic output impedance.
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.728 (1992): "Coding of speech at 16 kbit/s using
low-delay code-excited linear prediction".
[2] I-ETS 300 245-1: "Integrated Services Digital Network (ISDN); Technical
characteristics of telephony terminals, Part 1: General".
[3] CCITT Recommendation G.711 (1988): "Pulse code modulation (PCM) of voice
frequencies".
[4] I-ETS 300 245-2: "Integrated Services Digital Network (ISDN); Technical
characteristics of telephony terminals, Part 2: PCM A-law handset telephony".
[5] I-ETS 300 245-3: "Integrated Services Digital Network (ISDN); Technical
characteristics of telephony terminals, Part 3: Pulse Code Modulation (PCM)
A-law, loudspeaking and hands free telephony".
[6] CCITT Recommendation G.101 (1988): "The transmission plan".
[7] TBR 3 (1995): "Integrated Services Digital Network (ISDN); Attachment
requirements for terminal equipment to connect to an ISDN using ISDN basic
access".
[8] ETS 300 144: "Integrated Services Digital Network (ISDN); Audiovisual services;
Frame structure for a 64 kbit/s to 1 920 kbit/s channel and associated syntax for
inband signalling".
[9] ITU-T Recommendation P.51 (1993): "Artificial mouth".
[10] ITU-T Recommendation P.57 (1993): "Artificial ears".
[11] IEC Publication 651: "Sound level meters".
[12] CCITT Recommendation G.712 (1992): "Transmission performance
characteristics of pulse code modulation".
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I-ETS 300 245-8: January 1996
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this Part of the I-ETS, the following definitions apply:
digital interface: The B-channels available at the coincident S and T reference point at an ISDN basic
access.
hands free (telephone) set: A telephone set using a loudspeaker associated with an amplifier as a
telephone receiver and which may be used without a handset [ITU-T Recommendation P.10 (1993
...