SIST ETS 300 450 E1:2004

• Abstract:

  Specification of the terminal equipment side of the interface and test procedures for compliance.

• Status: Published
• Publication Date: 30-Sep-2004
• ICS: 33.040.50 - Lines, connections and circuits
• Technical Committee: BTC - Business telecommunications
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Oct-2004
• Due Date: 01-Oct-2004
• Completion Date: 01-Oct-2004
• Mandate: T-147-2
• Ref Project: ETSI ETS 300 450 ed.1 (1996-02) - Business TeleCommunications (BTC); Ordinary and Special quality voice bandwidth 2-wire analogue leased lines (A2O and A2S); Terminal equipment interface

SIST ETS 300 450 E1:2004 is the Slovenian adoption of ETS 300 450 Edition 1 from SIST, published by ETSI for Business TeleCommunications (BTC). It specifies the terminal equipment interface for Ordinary and Special quality voice bandwidth 2-wire analogue leased lines (A2O and A2S), together with the test methods used to check compatibility. In practice, it tells manufacturers and test labs what the terminal equipment side of the connection must look like and how conformance is measured.

What does SIST ETS 300 450 E1:2004 specify?

SIST ETS 300 450 E1:2004 specifies the physical and electrical characteristics of terminal equipment intended for connection to the network termination points of ONP ordinary quality or special quality voice bandwidth 2-wire analogue leased lines. It also gives the test principles for checking those characteristics.

The standard is written for compatibility with those leased lines, not for regulatory purposes. Customer premises wiring and the installation between the terminal equipment and the NTP are outside its scope.

The document is organized into the following main parts:

Annex	What it covers
Annex A	Normative test methods for compliance
Annex B	Informative bibliography and related sources

Clause 4 contains the actual requirements, split into physical characteristics, electrical characteristics, safety, and EMC.

What are the key requirements of SIST ETS 300 450 E1:2004?

SIST ETS 300 450 E1:2004 focuses on how the interface is connected, how it behaves electrically, and how it is tested. For a designer or compliance team, the key point is that the interface must remain compatible with the leased line while limiting unwanted signal levels and avoiding power feeding.

• Physical connection methods, Clause 4.1 - The terminal equipment shall provide one or more approved connection methods, including the 8-contact plug defined in EN 28877, a set of connection contacts for solid conductors, or a wiring arrangement with unterminated solid wire conductors. In practice, this means the interface has to present a usable, standardized physical connection for installation and testing.

• Return loss, Clause 4.2.1 - The impedance presented by the interface must meet the return loss requirement against the reference impedance over the voice band. This matters because poor matching can disturb line performance and affect the way the leased line carries voice-band signals.

• Longitudinal conversion loss, Clause 4.2.2 - The interface must meet the minimum longitudinal conversion loss values in table 2 and figure 1. In practice, this limits how much unwanted transverse signal appears when the line is exposed to longitudinal interference, which helps the terminal equipment tolerate network conditions.

• Transmission signals from an acoustic input, Clause 4.2.3.1.1 - Equipment with an acoustic input must meet the Sending Loudness Rating (SLR) requirement when terminated with the reference impedance. This is relevant for telephone-style equipment because it controls how strongly speech is sent into the leased line.

• Internally generated electrical signals, Clauses 4.2.3.2.1 to 4.2.3.2.3 - Equipment that generates its own signal electrically is limited by mean power, peak voltage, and power in a 10 Hz bandwidth within the voice band. The standard also treats DTMF specially. This is important for modems, tone generators, answering machines, voice mail, and similar equipment because it prevents excessive narrowband or average output.

• Through-connected electrical signals, Clause 4.2.3.3 - Where the output signal is derived from another electrical interface, the ETS gives no requirement on the output level in the 0 Hz to 4 300 Hz range. For implementers, this means the standard does not try to limit signals that originate elsewhere in the equipment.

• Out-of-band sending power, Clause 4.2.4 - All terminal equipment must limit sending power above 4.3 kHz when tested with the defined terminating impedance, and the acoustic or electrical source interfaces must be quiescent as applicable. This matters because unwanted energy outside the voice band can interfere with network operation or other equipment.

• Power feeding, Clause 4.2.5 - The interface shall not feed power to the network interface and shall not require power from it. In practice, the terminal equipment must not rely on the line for powering itself and must not inject power onto the leased line.

• Safety and EMC, Clauses 4.3 and 4.4 - The interface shall comply with the TNV connection requirements in clause 6 of EN 60950, and there are no EMC requirements in this ETS. For compliance work, safety is covered here, while EMC is left to other applicable rules.

What terms does SIST ETS 300 450 E1:2004 define?

• leased lines - Telecommunications facilities from a public network that provide defined transmission characteristics between network termination points without user-controlled switching.
• Network Termination Point (NTP) - The physical network connection and access specifications that form part of the public telecommunications network.
• reference impedance Z - The complex impedance used as the test reference, defined for the measurement methods in the standard.
• terminal equipment - Equipment intended to connect to the public telecommunications network to send, process, or receive information.
• voice bandwidth - The frequency range from 300 Hz to 3 400 Hz.
• Sending Loudness Rating (SLR) - A measure used to evaluate the sending level of equipment with an acoustic input.
• Telecommunications Network Voltage (TNV) - The network voltage category referenced from EN 60950 for safety-related connection requirements.
• ElectroMagnetic Compatibility (EMC) - The compatibility topic named in the document’s requirements section, even though this ETS does not set EMC requirements.

Who uses SIST ETS 300 450 E1:2004?

SIST ETS 300 450 E1:2004 is used by equipment manufacturers, test laboratories, and compliance teams that design or verify terminal equipment for ONP A2O and A2S leased lines. It is also useful for buyers and technical specifiers who need to confirm that a product is intended for these interfaces.

Typical users include designers of telephones, modems, answering machines, voice mail units, tone generators, and other equipment that may send acoustic or electrical signals into the line. Network and quality teams use it when checking interface compatibility, conformance testing, and acceptance of leased-line terminal equipment.

What changed in SIST ETS 300 450 E1:2004 from the previous edition?

SIST ETS 300 450 E1:2004 corresponds to ETS 300 450 Edition 1.

Which standards are used with SIST ETS 300 450 E1:2004?

• EN 28877 - Provides the connector and contact assignments for the 8-contact plug connection method.
• EN 60950 - Provides the TNV safety requirements used in Clause 4.3.
• ITU-T Recommendation P.56 - Provides the objective active speech level measurement method used for speech and audio-related testing.
• ITU-T Recommendation P.64 - Provides the method for determining sensitivity and frequency characteristics used to calculate SLR.
• ETS 300 448 - Gives the connection characteristics and network interface presentation for Ordinary quality voice bandwidth 2-wire analogue leased line (A2O).
• ETS 300 449 - Gives the connection characteristics and network interface presentation for Special quality voice bandwidth 2-wire analogue leased line (A2S).
• TBR 15 - Gives the attachment requirements for the terminal equipment interface and is identified as the regulatory subset of this ETS.
• CCITT Recommendation O.9 - Is cited as the basis for the longitudinal conversion loss measurement method.
• CCITT Recommendations M.1020 and M.1040 - Are named as the basis for the leased line standards related to this interface.

What does the SIST ETS 300 450 E1:2004 document contain?

The document contains the scope, normative references, definitions and abbreviations, and the main requirements for physical characteristics, electrical characteristics, safety, and EMC. Annex A gives the test methods used to verify compliance, including connection setup, reference and termination impedances, and specific tests for return loss, longitudinal conversion loss, SLR, power limits, out-of-band power, and power feeding.

It also includes the tables and figures that define the practical measurement setup and limit curves, such as the contact assignment table, the longitudinal conversion loss limits, the spectral power limits, and the bandwidths used in the test methods. Annex B lists the bibliography and related standards that support the document.

SLOVENSKI STANDARD
01-oktober-2004
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Business TeleCommunications (BTC); Ordinary and Special quality voice bandwidth 2-
wire analogue leased lines (A2O and A2S); Terminal equipment interface
Ta slovenski standard je istoveten z: ETS 300 450 Edition 1
ICS:
33.040.50 Vodi, zveze in tokokrogi Lines, connections and
circuits
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 450
TELECOMMUNICATION February 1996
STANDARD
Source: ETSI TC-BTC Reference: DE/BTC-02028
ICS: 33.020
ONP, leased line, A2O, A2S
Key words:
Business TeleCommunications (BTC);
Ordinary and Special quality voice bandwidth
2-wire analogue leased lines (A2O and A2S);
Terminal equipment interface
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 - [e-mail]
X.400: Internet:
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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ETS 300 450: February 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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ETS 300 450: February 1996
Contents
Foreword .5
Introduction.5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .7
3.1 Definitions .7
3.2 Abbreviations .8
4 Requirements.8
4.1 Physical characteristics.8
4.2 Electrical characteristics .9
4.2.1 Return loss .9
4.2.2 Longitudinal conversion loss .9
4.2.3 Transmission signals.10
4.2.3.1 Equipment with an acoustic input .10
4.2.3.1.1 Sending Loudness Rating (SLR) .10
4.2.3.2 Equipment with internally generated electrical signals .11
4.2.3.2.1 Maximum mean power .11
4.2.3.2.2 Maximum instantaneous power (peak
voltage) .11
4.2.3.2.3 Maximum power in a 10 Hz bandwidth.11
4.2.3.3 Equipment with an electrical input .12
4.2.4 Maximum sending power above 4,3 kHz .12
4.2.5 Power feeding .13
4.3 Safety.13
4.4 ElectroMagnetic Compatibility (EMC) .13
Annex A (normative): Test methods.15
A.1 General.15
A.1.1 Equipment connection .15
A.1.2 Reference impedance.15
A.1.3 Non-reactive termination.15
A.2 Test methods .16
A.2.1 Return loss.16
A.2.2 Longitudinal conversion loss.17
A.2.3 Sending Loudness Rating.18
A.2.4 Maximum mean power .19
A.2.5 Maximum instantaneous power (peak voltage) .20
A.2.6 Maximum power in a 10 Hz bandwidth.21
A.2.7 Maximum sending power above 4,3 kHz.22
A.2.8 Power feeding.23
Annex B (informative): Bibliography.24
History.25

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ETS 300 450: February 1996
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ETS 300 450: February 1996
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 resulted from a mandate from the Commission of the European Community (CEC) to provide
harmonized standards for the support of the Directive on Open Network Provision (ONP) of leased lines
(92/44/EEC).
There are two other standards directly related to this ETS:
ETS 300 448: "Business TeleCommunications (BTC); Ordinary quality voice bandwidth 2-wire
analogue leased line (A2O); Connection characteristics and network interface
presentation".
ETS 300 449: "Business TeleCommunications (BTC); Special quality voice bandwidth 2-wire
analogue leased line (A2S); Connection characteristics and network interface
presentation".
This ETS is based on information from ITU-T Recommendations and ETSI publications and the relevant
documents are quoted where appropriate.
Transposition dates
Date of adoption of this ETS: 2 February 1996
Date of latest announcement of this ETS (doa): 31 May 1996
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 November 1996
Date of withdrawal of any conflicting National Standard (dow): 30 November 1996
Introduction
The Council Directive on the application of ONP to leased lines (92/44/EEC) concerns the harmonization
of conditions for open and efficient access to, and use of, the leased lines provided over public
telecommunications networks, and the availability throughout the European Union (EU) of a minimum set
of leased lines with harmonized technical characteristics.
The consequence of the Directive is that telecommunications organizations within the EU shall make
available a set of leased lines within and between points in these countries with specified connection
characteristics and specified interfaces.
Two classes of standard will be used for the interfaces of terminal equipment designed for connection to
the ONP leased lines. ETSs, which are voluntary, give the full technical specifications for these interfaces,
whereas Technical Basis for Regulations (TBRs) give the essential requirements under the Second Phase
Directive (91/263/EEC) for attachment to the leased lines. This standard, which is an ETS, belongs to the
first category. The TBR (prTBR 15) is a subset of this corresponding ETS.
CCITT Recommendations M.1020 (1988) and M.1040 (1988) are used as the basis for the leased line
standards to which this terminal equipment interface relates.

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ETS 300 450: February 1996
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ETS 300 450: February 1996
1 Scope
This European Telecommunication Standard (ETS) specifies the full physical and electrical characteristics
and corresponding test principles for a terminal equipment interface for connection to the network
termination points of Open Network Provision (ONP) ordinary quality or special quality voice bandwidth
2-wire analogue leased lines defined by ETS 300 448 and ETS 300 449. This ETS is not written for
regulatory purposes.
This ETS is written only to ensure that the interface of the terminal equipment is compatible with the ONP
ordinary quality or special quality voice bandwidth 2-wire analogue leased line. It is applicable to all
interfaces designed for connection to these leased lines, however in the cases of apparatus that carries a
particular service, of complex apparatus and of apparatus in private networks, other ETSs may apply in
addition to this ETS.
Customer premises wiring and installation between the terminal equipment and the NTP are outside the
scope of this ETS.
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] EN 28877 (1989): "Information processing systems - Interface connector and
contact assignments for ISDN basic access interface located at reference points
S and T".
[2] EN 60950 (1992): "Safety of information technology equipment including
electrical business equipment".
[3] ITU-T Recommendation P.56 (1993): "Objective measurement of active speech
level".
[4] ITU-T Recommendation P.64 (1993): "Determination of sensitivity/ frequency
characteristics of local telephone systems to permit calculation of their loudness
ratings".
NOTE: This ETS also contains a number of informative references which have been included
to indicate the sources from which material has been derived, hence they do not have
an associated normative reference number. Details of these publications are given in
annex B. In some cases, the same publication may have been referenced in both a
normative and an informative manner.
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply:
leased lines: The telecommunications facilities provided by a public telecommunication network that
provide defined transmission characteristics between network termination points and that do not include
switching functions that the user can control, (e.g. on-demand switching).
Network Termination Point (NTP): All physical connections and their technical access specifications
which form part of the public telecommunications network and are necessary for access to and efficient
communication through that public network.
reference impedance Z : This is a complex impedance made up of a resistance of 270 Ω in series with
R
a parallel combination of 750 Ω and 150 nF. See also subclause A.1.2.

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ETS 300 450: February 1996
terminal equipment: Equipment intended to be connected to the public telecommunication network; i.e.:
- to be connected directly to the termination of a public telecommunication network; or
- to interwork with a public telecommunication network being connected directly or indirectly to the
termination of a public telecommunication network,
in order to send, process, or receive information.
voice bandwidth: The band of frequencies over the range 300 Hz to 3 400 Hz.
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
a Return loss in dB
dc direct current
DTMF Dual Tone Multi-Frequency
EMC ElectroMagnetic Compatibility
NTP Network Termination Point
ONP Open Network Provision
p Sound pressure at the mouth reference point (used in the calculation of SLR)
m
rms root mean square
SLR Sending Loudness Rating
S Sending sensitivity (used in the calculation of SLR)
mJ
S Sending sensitivity at frequency f (used in the calculation of SLR)
mJn n
TNV Telecommunications Network Voltage (see EN 60950 [2], subclause 3.4)
W
Sending weighting factor (used in the calculation of SLR)
sn
Z Reference impedance
R
Z Termination impedance
T
4 Requirements
4.1 Physical characteristics
Requirement: The terminal equipment shall provide one or more of the following connection methods:
a) an 8-contact plug of the type specified in EN 28877 [1] with contact assignments as specified in
table 1;
b) a set of connection contacts (e.g. an insulation displacement connector or screw terminal block) to
which solid conductors with diameters in the range 0,4 to 0,6 mm may be connected;
c) a wiring arrangement connected by any means to the terminal equipment, with unterminated solid
wire conductors with diameters in the range 0,4 to 0,6 mm at the distant end from the terminal
equipment.
Where a) and c) are provided, these may be detachable by the user such that only one is connected to the
terminal equipment at any one time.
NOTE: The normal presentation of the leased line is by means of a socket.

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ETS 300 450: February 1996
Table 1: Contact assignments
Contact number terminal equipment
1 Unused
2 Unused
3 Unused
4 & 5 Pair
6 Unused
7 Unused
8 Unused
Test: There shall be a visual inspection that one or more of the connection methods are provided. The
contact assignments and connection methods are tested indirectly through the tests in annex A.
4.2 Electrical characteristics
The requirements of subclause 4.2 apply only in the intended operating state of the terminal equipment.
4.2.1 Return loss
Requirement: The return loss of the impedance presented by the terminal equipment interface with
respect to the reference impedance, in the frequency range 200 Hz to 4 000 Hz, shall be greater than or
equal to 8 dB throughout the range when tested using a stimulus signal at a voltage equivalent to that of a
signal power of -9 dBm at 1 020 Hz.
Test: The test shall be conducted according to subclause A.2.1.
4.2.2 Longitudinal conversion loss
Requirement: The longitudinal conversion loss of the terminal equipment interface shall be greater than
or equal to the values given in table 2 and figure 1.
NOTE: The longitudinal conversion loss specifies the unwanted transverse signal detected by
the terminal equipment when a longitudinal signal is applied equally to the terminals of
the interface. Certain networks may have high longitudinal signal levels (e.g. 65 V root
mean square (rms)); in this case, a higher longitudinal conversion loss may be
necessary to ensure adequate operation of the terminal equipment.
Table 2: Longitudinal conversion loss, minimum values
Frequency range Minimum value
300 Hz to 600 Hz 40 dB
600 Hz to 3 400 Hz 46 dB
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ETS 300 450: February 1996
Longitudinal conversion loss dB
300 400 500 600 1000 2000 3400 5000
Frequency Hz
Figure 1: Longitudinal conversion loss, minimum values
Test: The test shall be conducted according to subclause A.2.2.
4.2.3 Transmission signals
The source and nature of the output signal from the terminal equipment interface can be classified in
several different ways thus dividing the terminal equipments into several non-exclusive categories. One
type of terminal equipment may therefore need to be treated as a member of more than one of the
categories. For the purposes of this ETS, the general categories requiring identification are defined as
follows:
a) any terminal equipment where the output signal is derived in real time from an integral
acoustic interface. See subclause 4.2.3.1;
b) any terminal equipment where the output signal is generated electrically within the terminal
equipment. See subclause 4.2.3.2;
c) any through connecting terminal equipment where the output signal is derived from another
electrical interface. See subclause 4.2.3.3.
NOTE: Terminal equipments may belong to more than one category. A telephone may be in
both category a) for telephony and category b) for the generation of Dual Tone Multi-
Frequency (DTMF) tones. A function for generating synthetic or recorded speech or
music, such as is found in answering machines or voice mail, is included in
category b).
4.2.3.1 Equipment with an acoustic input
4.2.3.1.1 Sending Loudness Rating (SLR)
Requirement: The minimum SLR of the terminal equipment, when terminated with the reference
impedance Z , shall be greater than or equal to -5 dB.
R
NOTE: The minimum SLR value of -5 dB refers to the actual measured value rather than the
nominal value, i.e. there is no tolerance on the specified value, and has been specified
to ensure no harm to the network. It is recommended that for normal operation, the
SLR should be greater than or equal to -2 dB.
Test: The test shall be conducted according to subclause A.2.3.

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ETS 300 450: February 1996
4.2.3.2 Equipment with internally generated electrical signals
4.2.3.2.1 Maximum mean power
Requirement: The mean power level in the frequency range 200 Hz to 3 800 Hz in any one minute period
shall be not greater than -9 dBm when the terminal equipment interface is terminated with the reference
impedance Z .
R
Test: The test shall be conducted according to subclause A.2.4.
4.2.3.2.2 Maximum instantaneous power (peak voltage)
The maximum instantaneous power is expressed in terms of the peak voltage.
Requirement: The peak voltage from the terminal equipment interface shall not be greater than 2,0 V
over the frequency range 200 Hz to 3 800 Hz when the terminal equipment interface is terminated with the
reference impedance Z .
R
Test: The test shall be conducted according to subclause A.2.5.
4.2.3.2.3 Maximum power in a 10 Hz bandwidth
Requirement: The maximum power within a 10 Hz bandwidth centred at any frequency within the
frequency band 0 Hz to 4 300 Hz, and wholly contained within that frequency band, shall not exceed the
limits given in table 3 and figure 2 when the terminal equipment interface is terminated with the reference
impedance Z .
R
Exceptionally, when sending DTMF tones, the maximum power in a 10 Hz bandwidth between the
frequencies 1 200 Hz and 1 700 Hz shall not exceed -3 dBm.
NOTE: Generally, DTMF tones will have a duty cycle of 50 % or less.
Table 3: Maximum power in a 10 Hz bandwidth
Points Frequency range kHz Maximum sending power dBm
(see fig. 2)
0,0 -33
A 0,03 -33
B 0,1 -16
C 0,3 -6
D 3,4 -6
E 3,8 -15
F 4,3 -44
NOTE: Limits for intermediate frequencies are found by drawing a
straight line between the break points in table 3 on a
logarithmic(frequency) - linear(dB) scale.

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ETS 300 450: February 1996
0 0,03 0,1 0,3 3,4 3,8 4,3
Frequency kHz
-6
CD
-10
-15
-16
E
B
-20
-30
-33
A
-40
F
-44
-50
Measurement bandwidth 10 Hz
Not to scale
Maximum
power dBm
Figure 2: Maximum power in a 10 Hz bandwidth
Test: The test shall be conducted according to subclause A.2.6.
4.2.3.3 Equipment with an electrical input
There is no requirement on the level of the output signal in the frequency range 0 Hz to 4 300 Hz where
the ou
...