ETSI I-ETS 300 380 ed.1 (1995-03)

SLOVENSKI STANDARD
SIST I-ETS 300 380 E1:2003
01-december-2003
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Universal Personal Telecommunication (UPT); Access devices Dual Tone Multi
Frequency (DTMF) sender for acoustical coupling to the microphone of a handset
telephone
Ta slovenski standard je istoveten z: I-ETS 300 380 Edition 1
ICS:
33.040.01 Telekomunikacijski sistemi Telecommunication systems
na splošno in general
SIST I-ETS 300 380 E1:2003 en

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

Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the

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.

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

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

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

3 Abbreviations.......................................................................................................................................7

4 Transmission requirements.................................................................................................................8

4.1 Signalling frequencies..........................................................................................................8

4.2 Transmission levels .............................................................................................................8

4.3 Duration ...............................................................................................................................8

4.3.1 Manually controlled sending............................................................................8

4.3.2 Automatic controlled sending ..........................................................................8

4.4 Unwanted frequency components .......................................................................................9

5 Test specification ................................................................................................................................9

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

5.2 Frequencies .........................................................................................................................9

5.3 Transmission levels .............................................................................................................9

5.4 Duration ...............................................................................................................................9

5.5 Unwanted frequency components .......................................................................................9

Annex A (normative): Test arrangement...............................................................................................10

A.1 IEC 318 coupler/flat plate arrangement ............................................................................................10

Annex B (informative): Comments on acoustic coupling ........................................................................11

B.1 Output level .......................................................................................................................................11

B.2 Unwanted signals ..............................................................................................................................11

B.3 Test setup..........................................................................................................................................11

B.4 Level difference.................................................................................................................................11

Annex C (informative): Bibliography........................................................................................................12

History..........................................................................................................................................................13

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 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

This I-ETS defines the tone generating and acoustical characteristics of a one-way (sending) Universal

Personal Telecommunication (UPT) access device of Dual Tone Multi Frequency (DTMF) type to be

acoustically coupled to the mouthpiece of a telephone set. The characteristics specified have been

chosen to conform to the transmission requirements as specified in ETS 300 001 and, therefore, to be

generally acceptable for use in the Public Switched Telephone Network (PSTN) and Integrated Services

The I-ETS specifies a test arrangement to verify conformance. It is not possible to standardize the

physical dimensions for efficient acoustic coupling because of the wide variety of handset types in use in

Europe. When using a device conforming to this I-ETS, the electrical level to the network will depend on

the characteristics of the telephone set to which it is acoustically coupled. Annex B to this I-ETS indicates

the variation level that could be expected. A worst case scenario is that a device conforming to this I-ETS

NOTE: The specification of the functional requirements of the device is outside the scope of

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

[1] IEC 318: "An IEC artificial ear, of the wideband type, for the calibration of