ETSI I-ETS 300 302-1 ed.2 (1996-11)

Integrated Services Digital Network (ISDN); Videotelephony teleservice; Part 1: Electroacoustic characteristics for 3,1 kHz bandwidth handset terminals

RI/TE-04042

Digitalno omrežje z integriranimi storitvami (ISDN) – Daljinske storitve: videotelefonija – 1. del: Elektroakustične karakteristike terminalov v pogovorki s pasovno širino 3,1 kHz

General Information

• Status: Published
• Publication Date: 11-Nov-1996
• Technical Committee: TE 4 - Audiovisual and Voice Terminals
• Current Stage: 12 - Completion
• Due Date: 22-Nov-1996
• Completion Date: 12-Nov-1996
• Ref Project: SIST I-ETS 300 302-1 E2:2003 - Integrated Services Digital Network (ISDN); Videotelephony teleservice; Part 1: Electroacoustic characteristics for 3,1 kHz bandwidth handset terminals

Standards Content (Sample)

SLOVENSKI STANDARD
SIST I-ETS 300 302-1 E2:2003
01-december-2003
'LJLWDOQRRPUHåMH]LQWHJULUDQLPLVWRULWYDPL,6'1±'DOMLQVNHVWRULWYH
YLGHRWHOHIRQLMD±GHO(OHNWURDNXVWLþQHNDUDNWHULVWLNHWHUPLQDORYYSRJRYRUNLV
SDVRYQRãLULQRN+]
Integrated Services Digital Network (ISDN); Videotelephony teleservice; Part 1:
Electroacoustic characteristics for 3,1 kHz bandwidth handset terminals
Ta slovenski standard je istoveten z: I-ETS 300 302-1 Edition 2
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST I-ETS 300 302-1 E2:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST I-ETS 300 302-1 E2:2003

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SIST I-ETS 300 302-1 E2:2003
INTERIM
EUROPEAN I-ETS 300 302-1
TELECOMMUNICATION November 1996
STANDARD Second Edition
Source: ETSI TC-TE Reference: RI/TE-04042
ICS: 33.020
Key words: ISDN, telephony, terminal, video
Integrated Services Digital Network (ISDN);
Videotelephony teleservice;
Part 1: Electroacoustic characteristics for
3,1 kHz bandwidth handset terminals
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: [e-mail]
Tel.: [phone] - Fax: [phone]
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 300 302-1: November 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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Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .8
3.1 Definitions .8
3.2 Abbreviations .9
4 Mode 0U characteristics.9
4.1 Default encoding law.9
4.2 A-law encoding .9
4.3 μ-law encoding.10
5 Characteristics for framed transmission in PCM encoding .10
5.1 General .10
5.1.1 Encoding .10
5.1.2 Relative level .10
5.1.3 Volume control .11
5.2 Sensitivity - frequency response .11
5.3 Sending and Receiving Loudness Rating (SLR and RLR) .11
5.4 Sidetone.11
5.4.1 Talker sidetone.11
5.4.2 Listener sidetone .11
5.5 Terminal Coupling Loss (TCL).11
5.5.1 TCLw .11
5.5.2 Stability loss.11
5.6 Distortion.11
5.7 Variation of gain with input level.11
5.8 Out-of-band signals .12
5.9 Noise.12
5.10 Acoustic shock.12
5.11 Absolute delay.12
5.12 Lip synchronization .12
6 Characteristics for framed transmission in LD-CELP encoding.12
6.1 General .12
6.2 Sensitivity.12
6.2.1 Sending .12
6.2.2 Receiving.13
Annex A (normative): Test methods.14
A.1 General conditions for testing.14
A.2 Delay .14
A.2.1 Sending.14
A.2.2 Receiving .14

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A.3 Listener SideTone Rating (LSTR) . 14
A.4 Weighted Terminal Coupling Loss (TCLw). 15
Annex B (informative): Bibliography . 16
History. 17

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Foreword
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 a European Telecommunication Standard
(ETS), have its life extended for a further 2 years, be replaced by a new version of the I-ETS or, be
withdrawn.
This I-ETS is part 1 of a multipart standard covering "Integrated Services Digital Network (ISDN);
Audiovisual services in-band signalling testing", as described below:
Part 1: "Electroacoustic characteristics for 3,1 kHz bandwidth handset terminals";
Part 2: "Electroacoustic characteristics for 3.1 kHz bandwidth loudspeaking and handsfree
terminals";
Part 3: "Wideband handset";
Part 4: "Wideband coding loudspeaking and handsfree function".
Proposed announcement date
Date of adoption of this I-ETS: 25 October 1996
Date of latest announcement of this I-ETS (doa): 28 February 1997

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1 Scope
This part of the Interim European Telecommunication Standard (I-ETS) specifies the electroacoustic
characteristics for 3,1 kHz bandwidth handset telephony functions implemented in videotelephony
terminals. Those terminals are intended for use in the videotelephony teleservice and connected to the
basic access of the coincident S and T reference point of the Integrated Services Digital Network (ISDN)
using either Pulse Code Modulation (PCM) encoding according to CCITT Recommendation G.711 [1],
A-law and μ-law or Low Delay code-Excited Linear Prediction (LD-CELP) coding at 16 kbit/s as specified
in CCITT Recommendation G.728 [21].
The videotelephony teleservice in the ISDN is defined in ETS 300 264 (see annex B).
The requirements of this I-ETS specify those characteristics which deviate from those which an
ISDN 3,1 kHz telephony terminal needs to meet due to conditions which are special for the videotelephony
application (e.g. delay, framing). The corresponding requirements to an ISDN 3,1 kHz telephony terminal
can be found in I-ETS 300 245-2 [2] for PCM encoding and in I-ETS 300 245-8 [20] for LD-CLP encoding.
The requirements of clauses 4 and 5 are applicable to all videotelephonic terminals and clause 6 is
applicable when the optional LD-CELP encoding is implemented.
The relevant test methods are described in I-ETS 300 245-2 [2], and in I-ETS 300 245-8 [20].
NOTE: Type approval requirements for the 3,1 kHz telephony (CCITT Recommendation
G.711 [1], A-law) function of a videotelephony terminal can be found in TBR 8 (see
annex B).
2 Normative references
This I-ETS incorporates by dated or undated reference, provision 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 referenced to applies.
[1] CCITT Recommendation G.711 (1988): "Pulse code modulation (PCM) of voice
frequencies".
[2] I-ETS 300 245-2: "Integrated Services Digital Network (ISDN); Technical
characteristics of telephony terminals - Part 2: Pulse Code Modulation (PCM)
A-law, handset telephony".
[3] CCITT Recommendation G.122 (1988): "Influence of national systems on
stability talker echo in international connections".
[4] ETS 300 111 (1992): "Integrated Services Digital Network (ISDN); Telephony
3,1 kHz teleservice - Service description".
[5] ETS 300 145: "Integrated Services Digital Network (ISDN); Audiovisual
teleservices - Videotelephony systems and terminal equipment operating on one
or two 64 kbit/s channels".
[6] 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".
[7] ITU-T Recommendation P.64 (1993): "Determination of sensitivity/frequency
characteristics of local telephone systems".
[8] CCITT Recommendation G.701 (1988): "Vocabulary of digital transmission and
multiplexing, and pulse code modulation (PCM) terms".
[9] CCITT Recommendation I.112 (1988): "Vocabulary of terms for ISDNs".

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[10] ITU-T Recommendation P.10 (1993): "Vocabulary of terms on telephone
transmission quality and telephone sets".
[11] ETS 300 143: "Integrated Services Digital Network (ISDN) - Audiovisual
services inband signalling procedures for audiovisual terminals using digital
channels up to 2 048 kbit/s".
[12] CCITT Recommendation G.725 (1988): "System aspects for the use of the
7 kHz audio codec within 64 kbit/s".
[13] ETS 300 267-1: "Integrated Services Digital Network (ISDN); Telephony 7 kHz
and videotelephony teleservices - Digital Subscriber Signalling System No. one
(DSS1) protocol - Part 1: Protocol specification".
[14] ITU-T Recommendation P.31 (1993): "Transmission characteristics for digital
telephones".
[15] CCITT Recommendation G.101 (1988): "The transmission plan".
[16] ISO 3 (1977): "Preferred numbers - Series of preferred numbers".
[17] ITU-T Recommendation P.57 (1993): "Artificial ears".
[18] IEC 225: "Octave, half-octave and third-octave band filters intended for the
analysis of sound and vibrations".
[19] ITU-T Recommendation P.79 (1993): "Calculation of loudness ratings for
telephone sets".
[20] I-ETS 300 245-8 (1996): "Integrated Services Digital Network (ISDN); Technical
characteristics of Telephony Terminals, Part 8 - Speech transmission
characteristics when using low-delay code-excited linear prediction coding at
16 kbit/s".
[21] CCITT Recommendation G.728 (1992): "Coding of speech at 16 kbit/s using low
delay code excited linear prediction".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this part of the I-ETS, the following definitions apply:
digital interface: The interface at the coincident S and T reference point.
Loudness Rating Guard-Ring Position (LRGP): This position is defined in
ITU-T Recommendation P.64 [7].
modes of operation: For the videotelephony teleservice in the ISDN, the modes of operation are defined
in ETS 300 145 [5].
service channel: A sub-channel which provides end-to-end signalling in the 64 kbit/s channel. The
service channel consists of the eighth bit of each byte. The structure of a 64 kbit/s channel (B-channel)
and the position of the service channel is described in ETS 300 144 [6].
telephony 3,1 kHz teleservice: A description of the telephony 3,1 kHz teleservice in the ISDN is to be
found in ETS 300 111 [4].

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Terminal Coupling Loss (TCL): The frequency dependent coupling loss between the receiving port and
the sending port of a terminal due to:
− acoustical coupling at the user interface;
− electrical coupling due to crosstalk in the handset cord or within the electrical circuits;
− seismic coupling through the mechanical parts of the terminal.
NOTE 1: The receiving port and the sending port of a digital voice terminal is a 0 dBr point.
NOTE 2: The coupling at the user interface depends on the conditions of use.
terminal types: For the videotelephony teleservice in the ISDN, terminal types are defined in
ETS 300 145 [5].
videotelephony teleservice: A real-time audiovisual teleservice in which speech and moving pictures are
interchanged by means of one or two 64 kbit/s circuit mode connections in the ISDN. It is characterized by
the transmission of moving pictures simu
...