SIST TBR 015 E1:2004

SLOVENSKI STANDARD
SIST TBR 015 E1:2004
01-oktober-2004
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Business TeleCommunications (BTC); Ordinary and Special quality voice bandwidth 2-
wire analogue leased lines (A2O and A2S); Attachment requirements for terminal
equipment interface
Ta slovenski standard je istoveten z: TBR 015 Edition 1
ICS:
33.040.50 Vodi, zveze in tokokrogi Lines, connections and
circuits
SIST TBR 015 E1:2004 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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TECHNICAL TBR 15
BASIS for January 1997
REGULATION
Source: ETSI TC-BTC Reference: DTBR/BTC-02039
ICS: 33.020
Key words: ONP, leased line, A2O, A2S
Business TeleCommunications (BTC);
Ordinary and Special quality voice bandwidth
2-wire analogue leased lines (A2O and A2S);
Attachment requirements for terminal equipment interface
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.fr
Tel.: +33 4 92 94 42 00 - Fax: +33 4 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 1997. All rights reserved.

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TBR 15: January 1997
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 .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 Longitudinal conversion loss .9
4.2.2 Transmission signals.10
4.2.2.1 Equipment with an acoustic input .10
4.2.2.1.1 Sending Loudness Rating (SLR) .10
4.2.2.2 Equipment with internally generated electrical signals .10
4.2.2.2.1 Maximum mean power .10
4.2.2.2.2 Maximum instantaneous power (peak
voltage) .11
4.2.2.2.3 Maximum power in a 10 Hz bandwidth.11
4.2.2.3 Equipment with an electrical input .12
4.2.3 Maximum sending power above 4,3 kHz .12
4.2.4 Power feeding .13
4.3 Overvoltage protection.13
4.4 Safety.14
4.5 ElectroMagnetic Compatibility (EMC) .14
Annex A (normative): Test methods.15
A.1 General.15
A.1.1 Equipment connection .15
A.1.2 Test environment .15
A.1.3 Reference impedance.15
A.1.4 Non-reactive termination.16
A.2 Test methods .16
A.2.1 Longitudinal conversion loss.16
A.2.2 Sending Loudness Rating.17
A.2.3 Maximum mean power .18
A.2.4 Maximum instantaneous power (peak voltage) .19
A.2.5 Maximum power in a 10 Hz bandwidth.19
A.2.6 Maximum sending power above 4,3 kHz.20
A.2.7 Power feeding.22
Annex B (normative): TBR Requirements Table (TBR-RT).23
Annex C (informative): Bibliography.24
History.25

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Foreword
This Technical Basis for Regulation (TBR) has been produced by the Business TeleCommunications
(BTC) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This TBR resulted from a mandate from the Commission of the European Community (CEC) to provide
harmonized standards for the support of the Second Phase Directive (91/263/EEC).
This TBR is based on information from ITU-T Recommendations and ETSI publications and the relevant
documents are quoted where appropriate.
Introduction
The Council Directive on the application of Open Network Provision (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 telecommunication 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. European Telecommunication Standards (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 TBR is a subset of the corresponding ETS 300 450.
CCITT Recommendations M.1020 (1988) and M.1040 (1988) are used as the basis for the leased line
standards to which this terminal attachment requirement TBR relates.

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1 Scope
This Technical Basis for Regulation (TBR) specifies the attachment requirements and corresponding test
principles for a terminal equipment interface intended 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.
The term "attachment requirements" in the context of this TBR describes the essential requirements for
access which have to be fulfilled under articles 4(c) to 4(f) of the Second Phase Directive (91/263/EEC).
Conformance to these requirements does not guarantee end-to-end interoperability.
This TBR is applicable to all interfaces designed for connection to the ONP ordinary quality or special
quality voice bandwidth 2-wire analogue leased lines. It covers the essential requirements for the physical
and electrical characteristics of the terminal equipment interface.
Customer premises wiring and installation between the terminal equipment and the Network Termination
Point (NTP) are outside the scope of this TBR.
2 Normative references
This TBR 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 TBR 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] ITU-T Recommendation P.56 (1993): "Objective measurement of active speech
level".
[3] ITU-T Recommendation P.64 (1993): "Determination of sensitivity/ frequency
characteristics of local telephone systems to permit calculation of their loudness
ratings".
NOTE: This TBR 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 C. 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 TBR, 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 telecommunication 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.1.3.

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TBR 15: January 1997
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 TBR, the following abbreviations apply:
ac alternating current
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 Telecommunication Network Voltage (see EN 60950 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
Justification: Without a means of connection, it is impossible for the terminal equipment to connect to the
network, therefore this is included in order for the terminal equipment to interwork with the network (article
4f).
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 mm 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 mm 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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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 Longitudinal conversion loss
Justification: Certain networks may have high longitudinal signal levels (e.g. 65 volts rms). A longitudinal
conversion loss is specified in order to prevent these longitudinal signals being converted into transverse
signals which may cause harm to the network, article 4(d).
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.
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
Longitudinal conversion loss dB
50
46
40
30
20
10
300 400 500 600 1000 2000 3400 5000
Frequency Hz
Figure 1: Longitudinal conversion loss, minimum values

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Test: The tests shall be conducted according to subclause A.2.1.
4.2.2 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 equipment 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. 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 4.2.2.1;
b) any terminal equipment where the output signal is generated electrically within the terminal
equipment. See subclause 4.2.2.2;
c) any through connecting terminal equipment where the output signal is derived from another
electrical interface. See subclause 4.2.2.3.
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 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).
Justification: The public network may use equipment such as frequency division multiplexing equipment
that may be affected by signals of excessive amplitude that cause line amplifiers that carry multiplexed
signals to operate in a non-linear region resulting in major distortion to channels allocated to other users;
the SLR (subclause 4.2.2.1.1), mean power (subclause 4.2.2.2.1) and instantaneous power (subclause
4.2.2.2.2) are therefore limited to prevent this distortion and harm to the network, article 4(d). The
requirement to limit power in a 10 Hz bandwidth (subclause 4.2.2.2.3) is needed to prevent single tone
interference to other connections. Such interference may arise through crosstalk in cables or through
intermodulation effects in frequency division multiplexing equipment. Additionally, signal levels below the
voice band (subclause 4.2.2.2.3) are limited to prevent interference with carriers and gain control signals
with frequency division multiplexing equipment. It is not practical to limit the level of signals that originate
from another interface on the terminal equipment and therefore there is no requirement on this category of
equipment within this TBR (subclause 4.2.2.3).
4.2.2.1 Equipment with an acoustic input
4.2.2.1.1 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 refers to the actual measured value rather than the nominal value,
i.e. there is no tolerance on the specified value.
Test: The test shall be conducted according to subclause A.2.2.
4.2.2.2 Equipment with internally generated electrical signals
4.2.2.2.1 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.2.3.

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4.2.2.2.2 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 volts
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.2.4.
4.2.2.2.3 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
Point Frequency 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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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.2.5.
4.2.2.3 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 output signal is derived from another electrical interface (e.g. by through connection).
NOTE: It is not practical to limit the level of signals that originate from another interface on the
terminal equipment and therefore there is no requirement on this category of
equipment within this TBR. It is recommended that the equipment supplier should
indicate allowed input signal levels at other ports to which through connection is
allowed.
4.2.3 Maximum sending power above 4,3 kHz
This requirement applies to all terminal equipments. Where the output signal from the terminal equipment
is derived from an acoustic interface or an electrical interface, these interfaces shall be in their quiescent
states.
Justification: Under article 4(d), in order to prevent harm to the network, it is necessary to limit the
sending power above 4,3 kHz since outband power may cause interference to other channels or services
(e.g. FDM equipment). Furthermore, out of band crosstalk may be caused in neighbouring pairs in a cable
and then out of band crosstalk may be converted into in band crosstalk through aliasing in an analogue to
digital converter that does not have adequate input filtering; thus in band crosstalk may be caused in other
channels.
Requirement: The maximum sending power above 4,3 kHz, in a bandwidth defined in table 4 and wholly
contained within the frequency range 4,3 kHz to 2 MHz, arising from normal operation of the terminal
equipment when terminated with 120 Ω, shall not exceed the limits shown in table 4 and figure 3.
Exceptionally, (e.g. during the sending of DTMF signals) the level of single frequency components in the
output spectrum may exceed the limits given in table 4 and figure 3 but shall not exceed -35 dBm per
component.

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NOTE 1: The terminating impedance of 120 Ω is chosen for the outband requirement as this is a
better approximation to the impedance seen by the terminal equipment at these
frequencies.
NOTE 2: "Normal operation of the terminal equipment" is defined in the test, see
subclause A.2.6.
Table 4: Maximum sending power above 4,3 kHz
Points Frequency range Maximum sending power in a Measurement
(see fig. 3) specified bandwidth bandwidth
G to H 4,3 kHz to 5 kHz -29 dBm decreasing to -36 dBm 300 Hz
H to I 5 kHz to 7 kHz -36 dBm decreasing to -46 dBm 300 Hz
J to K 7 kHz to 200 kHz -41 dBm 1 kHz
L to M 200 kHz to 2 000 kHz -45 dBm 10 kHz
NOTE: Limits for intermediate frequencies are found by drawing a straight line between the
break points in table 4 on a logarithmic(frequency) - linear(dB) scale.
4,3 5,0 7,0 200 2000 Frequency kHz
-10
300Hz 10kHz
1kHz
Measurement
bandwidth
-20
-29
-30
G
-36
H J
-40
-41
K
-45
-46 I
LM
-50
Maximum sending power (dBm)
Not to scale
in measurement bandwidth
Figure 3: Maximum sending power above 4,3 kHz
Test: The test shall be conducted according to subclause A.2.6.
4.2.4 Power feeding
Justification: Power feeding is not allowed from the terminal equipment in order to prevent harm to the
network, article 4(d).
Requirement: The terminal equipment interface shall not feed power to the network interface.
Test: The test shall be conducted according to subclause A.2.7.
4.3 Overvoltage protection
There are no overvoltage protection requirements under this TBR.

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4.4 Safety
There are no safety requirements under this TBR.
NOTE: Safety requirements are imposed under the Low Voltage Directive (73/23/EEC) and
articles 4a and 4b of the Second Phase Directive (91/263/EEC). Subclause 4.3 of
ETS 300 450 defines the terminal equipment interface as a TNV circuit. Detailed
requirements for TNV circuits are given in EN 60950.
4.5 ElectroMagnetic Compatibility (EMC)
There are no EMC requirements under this TBR.
NOTE: General EMC requirements are imposed under the EMC Directive (89/336/EEC).
Requirements specific to terminal equipment will be added to this TBR when
appropriate specifications become available.

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Annex A (normative): Test methods
A.1 General
This annex describes the test principles to determine the compliance of a terminal equipment against the
requirements of this TBR.
It is outside the scope of this annex to identify the specific details of the implementation of the tests.
A terminal equipment may be designed for through-connecting and may fulfil the electrical requirements
only if through-connected. In these cases, the requirements of this TBR are valid and the tests are carried
out with the through-connection terminated as specified by the manufacturer.
Details of test equipment accuracy and the specification tolerance of the test devices are not included in
all cases. Where such details are provided, they shall be complied with, but the way they are expressed
shall not constrain the method of implementing the test.
NOTE: Attention is drawn to the issue of measurement uncertainty which may be addressed in
future documents. Not all the required test results make allowance for spurious events
during testing (e.g. errors due to EMC effects), which may make it necessary to repeat
a test.
The test configurations given do not imply a specific realization of test equipment or test arrangement or
the use of specific test devices for conformance testing. However, any test configuration used shall
provide those test conditions specified under "interface state", "stimulus" and "monitor" for each individual
test.
The test equipment shall be a device, or a group of devices, generating a stimulus signal conforming to
this annex and capable of monitoring the signal received from the interface.
A.1.1 Equipment connection
The tests in this TBR shall be carried out using the connection method provided in accordance with
subclause 4.1. Where more than one connection method is provided, the testing shall be performed using
the connection method preferred by the equipment supplier.
A.1.2 Test environment
All tests shall be performed at:
- an ambient temperature in the range +19 °C to +25 °C;
- a relative humidity in the range 5 % to 75 %.
For terminal equipment which is not designed to operate within the environmental range specified above,
all tests shall be performed within the operational range specified by the supplier.
For terminal equipment which is directly powered (either wholly or partly) from the mains supply, all tests
shall be carried out at a point within ± 5 % of the rated nominal voltage of that supply. If the equipment is
powered by other means and those means are not supplied as part of the apparatus (e.g. batteries,
stabilized ac supplies, dc), all tests shall be carried out within the power supply limit declared by the
supplier. If the power supply is ac, the test shall be conducted within ± 4 % of the nominal frequency of
that supply.
A.1.3 Reference impedance
), this shall be a complex impedance made
Where the test defines the use of the reference impedance (Z
R
up of a resistance of 270 Ω in series with a parallel combination of 750 Ω and 150 nF. This is shown in
figure A.1. Specific realizations of the reference impedance required for the performance of the tests shall
have a return loss against Z of 40 dB over the frequency range 300 Hz to 3 400 Hz.
R

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750 ohm
270 ohm
150 nF
Figure A.1: Reference impedance Z
R
A.1.4 Non-reactive termination
Where the test defines the use of a termination impedance (Z ) of 120 Ω, this shall be a non-reactive
T
resistance of 120 Ω ± 0,25 %.
A.2 Test methods
One test may cover more than one requirement. The scope of each test is defined under the heading
"purpose".
A.2.1 Longitudinal conversion loss
Requirement: Subclause 4.2.1.
Purpose: To measure the longitudina
...