Integrated Services Digital Network (ISDN); Technical characteristics of telephony terminals; Part 2: PCM A-law handset telephony

Specify telephony terminal used at S/T interface of basic access to the ISDN, including electrical, logical and acoustical characteristics

Digitalno omrežje z integriranimi storitvami (ISDN) – Tehnične karakteristike telefonskih terminalov – 2. del: Telefonija s pogovorkami s pretvorbo govora po pravilu PCM A-law

General Information

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

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SIST I-ETS 300 245-2 E1:2003
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SLOVENSKI STANDARD
SIST I-ETS 300 245-2 E1:2003
01-december-2003
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Integrated Services Digital Network (ISDN); Technical characteristics of telephony

terminals; Part 2: PCM A-law handset telephony
Ta slovenski standard je istoveten z: I-ETS 300 245-2 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST I-ETS 300 245-2 E1:2003 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST I-ETS 300 245-2 E1:2003
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SIST I-ETS 300 245-2 E1:2003
EUROPEAN I-ETS 300 245-2
TELECOMMUNICATION May 1994
STANDARD
Source: ETSI TC-TE Reference: T/TE 10-07 (B)
ICS: 33.020, 33.040.40
ISDN, telephony terminals, handset function
Key words:
Integrated Services Digital Network (ISDN);
Technical characteristics of telephony terminals
Part 2: PCM A-Law handset telephony
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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SIST I-ETS 300 245-2 E1:2003
Page 2
I-ETS 245-2: May 1994

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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SIST I-ETS 300 245-2 E1:2003
Page 3
I-ETS 245-2: May 1994
Contents

Foreword .......................................................................................................................................................5

1 Scope ..................................................................................................................................................7

2 Normative references..........................................................................................................................7

3 Definitions and abbreviations ..............................................................................................................8

3.1 Definitions ............................................................................................................................8

3.2 Abbreviations .......................................................................................................................8

4 Call control functions...........................................................................................................................9

5 Transmission aspects .........................................................................................................................9

5.1 General ................................................................................................................................9

5.1.1 Encoding .........................................................................................................9

5.1.2 Relative level ...................................................................................................9

5.1.3 Volume control ................................................................................................9

5.2 Speech performance characteristics ...................................................................................9

5.2.1 Frequency response and sensitivity ................................................................9

5.2.1.1 Sending..................................................................................9

5.2.1.2 Receiving.............................................................................10

5.2.2 Volume control ..............................................................................................11

5.2.3 Sidetone ........................................................................................................11

5.2.3.1 Talkers sidetone ..................................................................11

5.2.3.2 Listeners sidetone................................................................12

5.2.4 Terminal Coupling Loss (TCL) ......................................................................12

5.2.4.2 Weighted Terminal Coupling Loss (TCLw)..........................12

5.2.4.2 Stability loss.........................................................................12

5.2.5 Distortion .......................................................................................................12

5.2.5.1 Sending................................................................................12

5.2.5.2 Receiving.............................................................................12

5.2.5.3 Sidetone...............................................................................12

5.2.6 Variation of gain with input level....................................................................13

5.2.6.1 Sending................................................................................13

5.2.6.2 Receiving.............................................................................13

5.2.7 Out-of-band signals.......................................................................................13

5.2.7.1 Discrimination against out-of-band input signals (Sending) 13
5.2.7.2 Spurious out-of-band signals (Receiving)............................13

5.2.8 Noise .............................................................................................................13

5.2.8.1 Sending................................................................................13

5.2.8.2 Receiving.............................................................................14

5.2.8.3 Level of sampling frequency (Receiving).............................14

5.2.9 Acoustic shock ..............................................................................................14

5.2.10 Delay .............................................................................................................14

5.3 Non-linear devices .............................................................................................................14

6 Power feeding ...................................................................................................................................14

6.1 General conditions.............................................................................................................14

7 Physical modules ..............................................................................................................................14

7.1 Handset..............................................................................................................................14

7.2 Audible alerting module .....................................................................................................14

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SIST I-ETS 300 245-2 E1:2003
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I-ETS 245-2: May 1994

Annex A (normative): Test specifications ............................................................................................ 15

A.1 General conditions for testing........................................................................................................... 15

A.2 Sidetone............................................................................................................................................ 15

A.2.1 Talker sidetone.................................................................................................................. 15

A.2.2 Listener sidetone............................................................................................................... 15

A.3 Weighted terminal coupling loss....................................................................................................... 16

A.4 Delay................................................................................................................................................. 16

Annex B (informative): Acoustic shock requirements............................................................................ 18

B.1 Continuous signal ............................................................................................................................. 18

B.2 Peak signal ....................................................................................................................................... 18

Annex C (informative): Bibliography ...................................................................................................... 18

History......................................................................................................................................................... 19

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SIST I-ETS 300 245-2 E1:2003
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I-ETS 245-2: May 1994
Foreword

This Interim European Telecommunication Standard (I-ETS) was prepared 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 an 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 second part of an I-ETS which is currently intended to comprise eight parts.

This I-ETS specifies technical characteristics for Integrated Services Digital Network (ISDN) telephony

terminals as described in the scope of this I-ETS. The characteristics are additional to type approval

requirements to which the terminal equipment is subject. The additional characteristics are meant to give

improved performance.
In the present version of this I-ETS the following parts are included:
Part 1: General (I-ETS 300 245-1 [1]).
Part 2: PCM A-law, handset telephony.
Part 3: PCM A-law, loudspeaking and handsfree telephony.
Part 4: Interface for additional equipment.
Part 5: Wideband (7 kHz) handset telephony.
Part 6: Wideband (7 kHz) handsfree telephony.
Part 7: Locally generated information tones.
Part 8: Terminal application of 16 kbit/s speech coding algorithms.
NOTE: Part 8 is still under study within ETSI.
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SIST I-ETS 300 245-2 E1:2003
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I-ETS 245-2: May 1994
Blank page
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SIST I-ETS 300 245-2 E1:2003
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I-ETS 245-2: May 1994
1 Scope

This Part of this Interim European Telecommunication Standard (I-ETS) specifies the technical

characteristics for Pulse Code Modulation (PCM) A-law 3,1 kHz handset telephony terminals to be used at

the basic access for the coincident S and T reference point of the Integrated Services Digital Network

(ISDN).

This Part applies in conjunction with I-ETS 300 245-1 [1] and the characteristics specified in this Part are

additional to those of I-ETS 300 245-1 [1].

The present version of this part does not cover measurements on receivers (in handsets) with low acoustic

output impedance.

NOTE: The characteristics specified in this I-ETS are supplementary to the mandatory

requirements given in ETS 300 085 [2].
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] I-ETS 300 245-1 (1994): "Integrated Services Digital Network (ISDN); Technical

characteristics of telephony terminals, Part 1 - General".
[2] ETS 300 085 (1990): "Integrated Services Digital Network (ISDN); 3,1 kHz
telephony teleservice, Attachment requirements for handset terminals".
[3] CCITT Recommendation P.10 (1988): "Vocabulary of terms on telephone
transmission quality and telephone sets".
[4] CCITT Recommendation G.701 (1988): "Vocabulary of digital transmission and
multiplexing, and pulse code modulation (PCM) terms".
[5] ETS 300 111 (1992): "Integrated Services Digital Network (ISDN); Telephony
3,1 kHz teleservice, Service description".
[6] CCITT Recommendation G.122 (1988): "Influence of national systems on
stability, talker echo and listener echo in international connections".
[7] CCITT Recommendation G.711 (1988): "Pulse code modulation (PCM) of voice
frequencies".
[8] CCITT Recommendation G.101 (1988): "The transmission plan".
[9] ITU-T Recommendation P.79 (1993): "Calculation of loudness ratings".

[10] IEC 225: "Octave, half-octave and third-octave band filters intended for the

analysis of sound and vibrations".
[11] CCITT Recommendation P.64 (1988): "Determination of sensitivity/frequency

characteristics of local telephone systems to permit calculation of their loudness

ratings".
[12] ISO 3 (1973): "Preferred numbers - Series of preferred numbers".
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SIST I-ETS 300 245-2 E1:2003
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I-ETS 245-2: May 1994
3 Definitions and abbreviations
3.1 Definitions

For the purposes of this I-ETS, the relevant definitions given in CCITT Recommendations P.10 [3] and G.701

[4] apply along with the following.

Telephony 3,1 kHz teleservice: A description of the telephony 3,1 kHz teleservice is to be found in ETS 300

111 [5].

Loudspeaking telephony terminal: A handset telephony terminal using a loudspeaker associated with

an amplifier as a telephone receiver. Defined in CCITT Recommendation P.10 [3].

Handsfree telephony terminal: A telephony terminal using a loudspeaker associated with an amplifier as

a telephone receiver and which can be used without a handset. Defined in CCITT Recommendation P.10

[3].

Terminal Coupling Loss (TCL): The frequency dependent coupling loss between the receiving port and

sending port of a terminal due to:
- acoustic 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 will depend on the conditions of use.

Weighted Terminal Coupling Loss (TCLw): The weighted TCL using the weighting of CCITT

Recommendation G.122 [6].

Digital interface: For the purposes of this I-ETS, the digital interface refers to the B-channels available at

the coincident S and T reference point at an ISDN basic access.
3.2 Abbreviations

For the purposes of this I-ETS, the relevant abbreviations in CCITT Recommendations P.10 [3] and G.701

[4] apply.
ERP Ear Reference Point, see CCITT Recommendation P.10 [3]
ETS European Telecommunication Standard
ETSI European Telecommunications Standards Institute
I-ETS Interim European Telecommunication Standard
ISDN Integrated Services Digital Network
LRGP Loudness Rating Guard-ring Position
LSTR Listener Side Tone Rating
MRP Mouth Reference Point, see CCITT Recommendation P.10 [3]
PCM Pulse Code Modulation
RLR Receiving Loudness Rating
SLR Sending Loudness Rating
STMR Side Tone Masking Rating
TCL Terminal Coupling Loss
TCLw weighted Terminal Coupling Loss
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SIST I-ETS 300 245-2 E1:2003
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I-ETS 245-2: May 1994
4 Call control functions
The requirements of I-ETS 300 245-1 [1] shall be met.
5 Transmission aspects
5.1 General

Recommendations and requirements for PCM A-law terminals are given here and in ETS 300 085 [2]. When

using other coding algorithms other parts of this I-ETS may apply.
5.1.1 Encoding

The default speech encoding algorithm for all telephony terminals shall be the A-law encoding at 64 kbit/s as

defined in CCITT Recommendation G.711 [7]. Any other possible encoding algorithm will be additional. For

some encoding algorithms recommendations are given in other parts of this I-ETS.
5.1.2 Relative level

The digital interface is defined as a 0 dBr point according to CCITT Recommendation G.101 [8].

5.1.3 Volume control

Unless stated otherwise, the requirements apply for all positions of the user-controlled receiving volume

control, if provided.
5.2 Speech performance characteristics
5.2.1 Frequency response and sensitivity

The frequency responses and sensitivities shall be measured as described in ETS 300 085 [2].

5.2.1.1 Sending

Requirements for the sending sensitivity (Sending Loudness Rating (SLR)) are given in ETS 300 085 [2].

The frequency response (from Mouth Reference Point (MRP) to digital interface) shall be within the limits

restricted by the fully drawn lines in figure 1.
In figure
...

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