ETSI I-ETS 300 281 ed.1 (1994-05)

SLOVENSKI STANDARD
SIST I-ETS 300 281 E1:2003
01-december-2003
Digitalno omrežje z integriranimi storitvami (ISDN) – Daljinske storitve: telefonija 7
kHz – Terminalske zahteve, potrebne za zagotavljanje združljivosti terminalov v
zvezi konec-konec
Integrated Services Digital Network (ISDN); Telephony 7 kHz teleservice; Terminal
requirements necessary for end-to-end compatibility
Ta slovenski standard je istoveten z: I-ETS 300 281 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST I-ETS 300 281 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST I-ETS 300 281 E1:2003

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SIST I-ETS 300 281 E1:2003
INTERIM
EUROPEAN I-ETS 300 281
TELECOMMUNICATION May 1994
STANDARD
Source: ETSI TC-TE Reference: T/TE 12-06 (A)
ICS: 33.080
ISDN, telephony 7kHz teleservice
Key words:
Integrated Services Digital Network (ISDN);
Telephony 7 kHz teleservice
Terminal requirements necessary for end-to-end compatibility
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 1994. All rights reserved.
New presentation - see History box

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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 .7
Introduction.7
1 Scope .9
2 Normative references .9
3 Definitions and symbols .11
3.1 Teleservices.11
3.2 Modes of operation .11
3.3 Terminal types .11
3.4 Acoustic Reference Level (ARL).11
3.5 Weighted Terminal Coupling Loss (TCLw).11
4 Abbreviations.12
5 D-channel characteristics.12
5.1 General .12
5.2 Outgoing calls .12
5.3 Incoming calls .13
5.3.1 Telephony 7 kHz call request .13
5.3.2 Telephony 3,1 kHz call request .13
5.4 Support of supplementary services .13
5.4.1 Terminal selection using MSN or SUB.13
5.4.2 Inband signalling when invoking supplementary services.13
5.5 Interim procedures.14
5.5.1 General.14
5.5.2 Outgoing calls.14
5.5.3 Incoming calls.14
5.6 Call clearing .14
6 B-channel characteristics .15
6.1 Relative level.15
6.2 Signal encoding .15
6.2.1 CCITT Recommendation G.711.15
6.2.1.1 A-law.15
6.2.1.2 μ-law .15
6.2.2 CCITT Recommendation G.722 encoding.15
6.3 Signal decoding .16
6.3.1 CCITT Recommendation G.711.16
6.3.1.1 A-law.16
6.3.1.2 μ-law .16
6.3.2 CCITT Recommendation G.722.16
6.3.2.1 General.16
6.3.2.2 Mode 1.16
6.3.2.3 Mode 2.16
6.3.2.4 Mode 3.16
6.3.2.5 Fallback to the telephony 3,1 kHz teleservice .16
6.3.2.6 Interworking with the Public Switched Telephone Network
(PSTN).17
6.4 Speech transmission characteristics (handset mode).17
6.4.1 Volume control .17
6.4.2 Sensitivity-frequency response.17
6.4.2.1 Sending.17
6.4.2.2 Receiving.17

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6.4.3 Loudness rating . 18
6.4.3.1 Sending Loudness Rating (SLR). 18
6.4.3.2 Receiving Loudness Rating (RLR). 18
6.4.4 Talker sidetone . 19
6.4.5 Terminal Coupling Loss (TCL). 19
6.4.5.1 Weighted Terminal Coupling Loss (TCLw). 19
6.4.5.2 Stability loss . 19
6.4.6 Distortion. 19
6.4.6.1 Sending. 19
6.4.6.2 Receiving . 20
6.4.6.3 Sidetone. 20
6.4.7 Out-of-band signals . 20
6.4.7.1 Discrimination against out-of-band input signals (Sending) 20
6.4.7.2 Spurious out-of-band (Receiving) . 20
6.4.8 Noise. 21
6.4.8.1 Sending. 21
6.4.8.2 Receiving . 21
6.4.9 Acoustic shock. 21
6.4.9.1 Continuous Signal. 21
6.4.9.2 Peak signal. 21
6.4.10 Delay. 21
7 In-band signalling. 22
7.1 Frame structure. 22
7.1.1 General . 22
7.1.2 Frame search . 22
7.1.3 Frame alignment. 22
7.1.4 Multiframe alignment . 22
7.2 Telephony 7 kHz BAS attributes . 22
7.2.1 General . 22
7.2.2 Audio coding command . 22
7.2.3 Audio capability. 23
7.3 Sequences . 24
7.4 Procedures. 24
Annex A (normative): Test methods. 25
A.1 General conditions for testing. 25
A.1.1 Environment for tests . 25
A.1.2 Power supply limitations. 25
A.1.3 Test equipment interface. 25
A.1.4 Test equipment requirements . 25
A.1.4.1 Electro-acoustic equipment . 25
A.1.4.2 Test equipment for the digital interface . 25
A.1.4.2.1 Codec specification. 25
A.1.4.2.2 Analogue interface . 25
A.1.4.2.3 Definition of 0 dBr point. 26
A.1.5 Accuracy of calibrations . 26
A.2 Speech transmission requirements testing. 26
A.2.1 Sensitivity-frequency response . 26
A.2.1.1 Sending. 26
A.2.1.2 Receiving . 27
A.2.2 Loudness rating. 27
A.2.2.1 Sending Loudness Rating. 27
A.2.2.2 Receiving Loudness Rating . 27
A.2.3 Sidetone . 27
A.2.3.1 Talker sidetone . 27
A.2.4 Terminal Coupling Loss (TCL) . 27
A.2.4.1 Weighted Terminal Coupling Loss (TCLw). 27
A.2.4.2 Stability loss. 28
A.2.5 Distortion . 29
A.2.5.1 Sending. 29

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A.2.5.2 Receiving.29
A.2.5.3 Sidetone .29
A.2.6 Out-of-band signals .29
A.2.6.1 Discrimination against out-of-band input signals (sending).29
A.2.6.2 Spurious out-of-band (receiving).30
A.2.7 Noise.30
A.2.7.1 Sending .30
A.2.7.2 Receiving.31
A.2.8 Acoustic shock.31
A.2.8.1 Continuous signal.31
A.2.9 Delay.31
Annex B (informative): Bibliography.33
History.34

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Foreword
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 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 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 I-ETS contains two annexes. Annex A is normative to this I-ETS whereas Annex B is informative.
Introduction
This I-ETS presents the requirements necessary for compatibility between handset terminals supporting
the telephony 7 kHz teleservice in the ISDN. It covers the following aspects:
1) D-Channel signalling;
2) Inband signalling;
3) Speech transmission characteristics.
The D-Channel and inband signalling procedures are based on existing standards, and references are
made to these.
A 7 kHz bandwidth handset usually requires the use of low acoustic impedance receivers. To test these
receivers, a type 3.2 artificial ear as specified in ITU-T Recommendation P. 57 is needed. Although this
ear is specified by ITU-TS, no device is commercially available at this time. The requirements presented
are based on test results using prototypes developed by individual test laboratories. The results need to
be checked on a commercially available device to secure reproducibility.
A terminal that supports the telephony 7 kHz teleservice shall also support the telephony 3,1 kHz
teleservice. The end-to-end compatibility requirements for this teleservice can be found in ETS 300 082.
The receive characteristics requirements and test methods of ETS 300 082 are not valid when low
acoustic impedance receivers are used.
There is an urgent need for a standard on the speech transmission characteristics of telephony 7 kHz
terminals. ETSI has, therefore, decided to publish this I-ETS in order to provide manufacturers and test
laboratories with a set of agreed requirements and test procedures based on the state of the art. ETSI will
continue the work on requirements and test methods and the results of this work will be included in a
revised version to be issued when the period of validity of this I-ETS has expired. Findings and comments
to this I-ETS are welcomed and should be sent to ETSI at the address indicated on the title page.
In the present version, no requirements to Listener Sidetone Rating (LSTR) have been included because
the test methods require further study. The users of this I-ETS should note that requirements to all
characteristics where the receiver is included may be altered when more experience has been gained.

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1 Scope
This I-ETS specifies technical characteristics (logical and electroacoustic) that are necessary to provide
end-to-end compatibility of terminal equipment that support the telephony 7 kHz teleservice as defined in
ETS 300 263 [1] which is intended for connection to the basic rate interface at the coincident S and T
reference point or S reference point of the pan-European Integrated Services Digital Network (ISDN), as
provided by European public telecommunications operators.
The requirements of this I-ETS are in addition to those of standards for connection to the ISDN basic rate
interface.
The requirements of this I-ETS describe the logical characteristics of the user-network signalling and
inband signalling relevant to this teleservice.
The requirements of this I-ETS provide real time two-way speech communication of an improved quality
when compared with the telephony 3,1 kHz teleservice.
The speech transmission requirements of this I-ETS define only those characteristics relevant to
telephony terminals equipped with a handset.
This I-ETS is applicable to terminal equipment, and other equipment (e.g. interworking units, conference
bridges), equipped with a handset and supporting the telephony 7 kHz teleservice.
In this I-ETS, the speech transmission requirements are not applicable to:
a) handsfree or loudspeaking telephony;
b) telephony for disabled people (e.g. with amplification of received speech as an aid for the hard of
hearing);
c) telephony in hostile environments.
NOTE 1: The characteristics of the ISDN user-network interface are specified in ETS 300 012
[2] and ETS 300 102-1 [3].
NOTE 2: Information about type approval specifications for attachment to the ISDN basic
access, and for terminals supporting the telephony 3,1 kHz teleservice in the ISDN can
be found in Annex B.
NOTE 3: The telephony 7 kHz teleservice as defined in ETS 300 263 [1] does not include a data
communication facility. The inband signalling codes for such a facility are, therefore,
not a part of this I-ETS. Relevant information can be found in ETS 300 144 [4] and
ETS 300 143 [5].
2 Normative references
This I-ETS incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications 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] ETS 300 263 (1994): "Integrated Services Digital Network (ISDN); Telephony 7
kHz teleservice, Service description".
[2] ETS 300 012 (1992): "Integrated Services Digital Network (ISDN); Basic user-
network interface, Layer 1 specification and test principles".
[3] ETS 300 102-1 (1990): "Integrated Services Digital Network (ISDN); User-
network interface layer 3, Specifications for basic control".

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[4] ETS 300 144: "Integrated Services Digital Network (ISDN); Audiovisual
Services, Frame structure for a 64 to 1 920 kbit/s channel and associated syntax
for inband signalling".
[5] 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".
[6] CCITT Recommendation G.701 (1988): "Vocabulary of digital transmission and
multiplexing, and pulse code modulation (PCM) terms".
[7] CCITT Recommendation I.112 (1988): "Vocabulary of terms for ISDNs".
[8] CCITT Recommendation I.230 (1988): "Definition of bearer service categories".
[9] CCITT Recommendation I.240 (1988): "Definition of teleservices".
[10] ITU-T Recommendation P.10 (1993): "Vocabulary of terms on telephone
transmission quality and telephone sets".
[11] ITU-T Recommendation P.51 (1993): "Artificial mouth".
[12] ITU-T Recommendation P.57 (1993): "Artificial ears".
[13] ETS 300 111 (1992): "Integrated Services Digital Network (ISDN); Telephony
3,1 kHz teleservice, Service description".
[14] CCITT Recommendation G.711 (1988): "Pulse Code Modulation (PCM) of voice
frequencies".
[15] CCITT Recommendation G.722 (1988): "7 kHz audio coding within 64 kbit/s".
[16] Draft prETS 300 267 (1993): "Integrated Services Digital Network (ISDN);
Telephony 7 kHz and videotelephony teleservices, Digital Subscriber Signalling
System No. one (DSS1) protocol".
[17] prI-ETS 300 322: Integrated Services Digital Network (ISDN); Digital Subscriber
Signalling System No. one (DSS1), Abstract Test Suite (ATS) for use of
signalling-network-layer protocol for circuit-mode basic call control".
[18] CCITT Recommendation G.101 (1988): "The transmission plan".
[19] CCITT Recommendation G.725 (1988): "System aspects for the use of the 7
kHz audio codec within 64 kbit/s".
[20] ETS 300 082 (1992): "Integrated Services Digital Network (ISDN); 3,1 kHz
telephony teleservice, End-to-end compatibility".
[21] ITU-T Recommendation P.31 (1993): "Transmission characteristics for digital
telephones".
[22] ITU-T Recommendation P.79 (1993): "Calculation of loudness ratings".
[23] ISO 3 (1973): "Preferred numbers - series of preferred numbers".
[24] ITU-T Recommendation P.64 (1993): "Determination of sensitivity/frequency
characteristics of local telephone systems to permit calculation of their loudness
ratings".
[25] IEC Publication 651: "Sound level meters".

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[26] CCITT Recommendation G.122 (1988): "Influence of national systems on
stability, talker echo, and listener echo in international connections".
3 Definitions and symbols
For the purposes of this I-ETS, the relevant definitions and symbols used in ETS 300 143 [5], ETS 300
144 [4], CCITT Recommendations G.701 [6], I.112 [7], I.230 [8], I.240 [9], and ITU-T Recommendations
P.10 [10], P.51 [11] and P.57 [12] apply with the following.
3.1 Teleservices
Telephony 3,1 kHz: A description of the telephony 3,1 kHz teleservice can be found in ETS 300 111 [13].
Telephony 7 kHz: A description of the telephony 7 kHz teleservice can be found in ETS 300 263 [1].
3.2 Modes of operation
The following modes of operation are defined:
Mode 0U: 64 kbit/s 3,1 kHz audio to CCITT Recommendation G.711 [14], unframed.
Mode 0F: 56 kbit/s 3,1 kHz audio to CCITT Recommendation G.711 [14] truncated to 7 bits,
framed.
Mode 1: 64 kbit/s 7 kHz audio to CCITT Recommendation G.722 [15].
Mode 2: 56 kbit/s 7 kHz audio to CCITT Recommendation G.722 [15] and up to 6,4 kbit/s data.
Mode 3: 48 kbit/s 7 kHz audio to CCITT Recommendation G. 722 [15] and up to 14,4 kbit/s
data.
NOTE: For modes 0F, 2 and 3 an additional 1,6 kbit/s capacity is reserved for service channel
framing and service control.
3.3 Terminal types
Three types of terminals are defined. These types are:
Type 0: a digital telephony terminal working in Mode 0U only.
Type 1: a telephony 7 kHz terminal capable of working in Modes 0U, 0F, 1 and 2. In Modes 0U
and 0F, both A-law and μ-law coding shall be implemented.
Type 2: a member of a family of telephony 7 kHz/data terminals capable of working at least in
Modes 0U, 0F, 1, 2 and 3. In Modes 0U and 0F, both A-law and μ-law coding shall be
implemented.
The Type 1 terminal supports the G.722-64 audio capability as defined in ETS 300 144 [4]. In order to
establish framing the terminal shall be able to transmit and receive audio encoded according to CCITT
Recommendation G.722 [15] at 56 kbit/s.
The type 2 terminal supports the G.722-48 audio capability as defined in ETS 300 144 [4].
3.4 Acoustic Reference Level (ARL)
The acoustic level which gives -10 dBm0 at the digital interface.
3.5 Weighted Terminal Coupling Loss (TCLw)
The TCLw, using the calculation procedure as given in Annex A to this I-ETS.

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4 Abbreviations
For the purposes of this I-ETS, the following abbreviations apply:
ARL Acoustic Reference Level
BAS Bit-rate Allocation Signal
CONF Conference Call, Add-on
DRP Eardrum Reference Point
ECT Explicit Call Transfer
ERP Ear Reference Point
HLC High Layer Compatibility
HOLD Call Hold
ISDN Integrated Services Digital Network
Lmest Sidetone path loss
LRGP Loudness Rating Guard Ring Position
LSTR Listener Sidetone Rating
MRP Mouth Reference Point
MSN Multiple Subscriber Number
PSTN Public Switched Telephone Network
RLR Receiving Loudness Rating
r.m.s root mean square
SB-ADPCM Sub-Band Adaptive Differential Pulse Code Modulation
SLR Sending Loudness Rating
STMR Sidetone Masking Rating
SUB Subaddressing
TCL Terminal Coupling Loss
TCLw Weighted Terminal Coupling Loss
TP Terminal Portability
UDI Unrestricted Digital Information
UDI-TA Unrestricted Digital Information with Tones and Announcements
3PTY Three Party
5 D-channel characteristics
5.1 General
This Clause describes the relation between the outband D-channel procedures and the inband B-channel
procedures for terminals to support the telephony 7 kHz teleservice and the interim procedures for
terminals connected to networks where the telephony 7 kHz teleservice, according to ETS 300 267 [16], is
not yet implemented.
ETS 300 267 [16] specifies the stage 3 description of the telephony 7 kHz teleservice at the T reference
point or the coincident S and T reference point by means of the Digital Subscriber Signalling System No.
one (DSS1) protocol.
NOTE: ETR 018 gives further guidance for the codepoints to be used for the Bearer capability
and High layer compat
...