SIST ETS 300 283 E1:2003

SLOVENSKI STANDARD
01-december-2003
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Business TeleCommunications (BTC); Planning of loudness rating and echo values for
private networks digitally connected to the public network
Ta slovenski standard je istoveten z: ETS 300 283 Edition 1
ICS:
33.040.35 Telefonska omrežja Telephone networks
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 283
TELECOMMUNICATION April 1994
STANDARD
Source: ETSI TC-BTC Reference: DE/BTC-02003
ICS: 33.020.040.40
Loudness, echo, PTN, digital, interworking
Key words:
Business TeleCommunications (BTC);
Planning of loudness rating and echo values for private networks
digitally connected to the public network
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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ETS 300 283: April 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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ETS 300 283: April 1994
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions, abbreviations and reference configurations .7
3.1 Definitions .7
3.2 Abbreviations .9
3.3 Reference configurations.10
4 Echo control .10
4.1 Transmission time.10
4.2 Echo loss of the private network at the NCP .11
5 Stability.11
6 Loudness ratings.11
Annex A (informative): Bibliography.12
History.13

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ETS 300 283: April 1994
Foreword
This European Telecommunication Standard (ETS) has been produced by the Business
TeleCommunications (BTC) Technical Committee of the European Telecommunications Standards
Institute (ETSI).
This ETS is a framework document which is intended for use by administrations, public and private
network operators. It deals with the transmission planning of Private Branch Networks (PBNs) with digital
access to the Integrated Services Digital Network (ISDN)/Public Switched Telephone Network (PSTN)
which send or receive speech telephone calls. It recognizes the overall responsibility of administrations for
ensuring that the quality of national communications is consistent with international quality objectives.
Public networks within Europe contain a mixture of analogue and digital equipment and there are
significant differences in the design of the analogue networks in different countries (e.g. different loudness
levels). In addition, although the public networks will eventually be very similar when they are fully digital,
the conversion from analogue to digital will be carried out in different ways and at different times in
different countries. During this conversion process, it may be possible to increase the impairment
allowances given to private networks and the greatest possible flexibility in this respect is desirable.
This ETS relates only to calls which pass through a public switched network to an International Switching
Centre (ISC). In the case of other calls (e.g. national calls) it may be possible for the impairment
allowances for private networks to be increased.
The approach followed is to specify the performance of a private network at the point or points where it is
connected to a public network. This approach may also be used for private networks that include
international leased circuits, provided that the performance at the connection point is maintained.
However, the approach to more complex topologies using international leased circuits is for further study.

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ETS 300 283: April 1994
1 Scope
This ETS is related to Private Branch Networks (PBNs) with a digital access to the Integrated Services
Digital Network (ISDN)/Public Switched Telephone Network (PSTN) with a fully 4-wire call path between
the Network Connection Point (NCP) and an International Switching Centre (ISC). It applies to call paths
carrying 3,1 kHz voice telephony between the NCP and the terminal in the PBN that sets up or answers
the call. If a call, before or after it is first answered, is diverted or extended within the PBN, by means of a
user-controlled feature, the extended call path is outside the scope of this ETS.
This ETS does not contain a compliance test specification. A compliance test at each NCP for each
possible call path within the network would require a prohibitive amount of testing for all networks except
the smallest. Furthermore, private networks are subject to frequent changes. Where a compliance
statement is provided, it shall be supported by computations and transmission performance data for the
apparatus involved (e.g. showing compliance with relevant ETSs).
The limits quoted in this ETS should ensure satisfactory echo and loudness performance.
This ETS does not apply to configurations where a part of the transmission path between the terminal and
the public network contains a segment that incorporates mobile systems or cordless telephones.
2 Normative references
This 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 ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
[1] ETS 300 085 (1990): "Integrated Services Digital Network (ISDN); 3,1 kHz
telephony teleservice; Attachment requirements for handset terminals
(Candidate NET 33)".
[2] CCITT Recommendation G.122 (1988): "Influence of national systems on
stability, talker echo, and listener echo in international connections".
[3] CCITT Recommendation G.131 (1988): "Stability and echo".
3 Definitions, abbreviations and reference configurations
3.1 Definitions
For the purposes of this ETS, the following definitions apply:
Channel, transmission channel: a means of unidirectional transmission of signals between two points.
Circuit, telecommunication circuit: a combination of two transmission channels permitting bidirectional
transmission of signals between two points, to support a single communication.
NOTE 1: In a telecommunication network, the use of the term "circuit" is generally limited to a
telecommunication circuit directly connecting two switching devices or exchanges,
together with associated terminating equipment.
Connection (in telecommunications): a chain of circuits interconnected by switching points, between
two different points in the network.
NOTE 2: A connection is the result of a switching operation.
NOTE 3: A connection which allows an end-to-end communication, e.g. conversation, may be
called a "complete connection".
NOTE 4: A connection makes a communication possible but is not a communication.

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