SIST TBR 017 E1:2004

• Abstract:

  Specification of the attachment requirements for a terminal equipment 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-147-2A
• Ref Project: ETSI TBR 017 ed.1 (1997-01) - Business TeleCommunications (BTC); Ordinary and Special quality voice bandwidth 4-wire analogue leased lines (A4O and A4S); Attachment requirements for terminal equipment interface

Overview

SIST TBR 017 E1:2004 establishes attachment requirements for terminal equipment interfaces connecting to ordinary and special quality voice bandwidth 4-wire analogue leased lines (A4O and A4S). Issued by the Slovenski inštitut za standardizacijo (SIST) and based on harmonized European standards, this document provides a framework for ensuring interoperability and compliance of business telecommunications (BTC) terminal equipment with public leased line services within the EU. It defines essential physical and electrical connection protocols and test procedures that verify terminal equipment compatibility with Open Network Provision (ONP) leased lines as determined by relevant ETSI and ITU-T specifications.

Keywords: BTC, analogue leased line, 4-wire, terminal equipment, attachment requirements, telecommunications interface, A4O, A4S, compliance testing, ONP, voice bandwidth.

Key Topics

• Scope of Requirements
  The standard specifies physical and electrical requirements for terminal equipment interfaces to ordinary and special quality 4-wire analogue leased lines. It ensures support for voice bandwidth operation (300 Hz to 3400 Hz) and covers interfaces as defined for ONP leased lines (ETSI ETS 300 451, ETS 300 452).

• Physical Interface Characteristics
  Acceptable connection methods include 8-contact plugs (per EN 28877), connector blocks, or unterminated solid wire conductors. Contact assignments are specified to standardize transmit and receive functions.

• Electrical Performance
  Requirements include:

  • Longitudinal Conversion Loss: Interfaces must limit conversion of longitudinal signals to transverse signals to avoid network interference.
  • Transmission Signal Limits: Maximum allowable values for sending loudness, mean power, instantaneous (peak) voltage, and bandwidth-specific signal power are defined.
  • Out-of-band Power: Power sent above the voice frequency band is strictly limited to prevent crosstalk or network disruption.
  • Power Feeding: Terminal equipment must not supply voltage or current to the network.

• Testing and Compliance
  Procedures specify appropriate test environments, reference impedances, and detailed setups to verify interface characteristics. Tests are designed to ensure equipment can reliably connect and communicate without causing harm or excessive interference.

Applications

• Telecom Equipment Certification
  Manufacturers of business telecom terminals use this standard to ensure their analogue voice equipment (e.g., PBX, modems, audio terminals) can be attached to leased line services in compliance with EU and national regulations.

• Network Operator Procurement
  Network and service providers rely on compliance with SIST TBR 017 E1:2004 during procurement to guarantee interoperable, fault-resistant connection of customer premises equipment.

• System Integration
  Integrators reference this standard to design communication systems with assured compatibility for voice transmission over public and private 4-wire leased lines.

• Regulatory Compliance
  Adherence to the standard facilitates fulfillment of European legislation (such as the Terminal Equipment and ONP Directives) for public telecom networks.

Related Standards

• ETSI ETS 300 451 & ETS 300 452: Technical specifications for ordinary and special quality 4-wire analogue leased lines.
• EN 28877: Connector and interface assignments for ISDN basic access, relevant for physical attachment options.
• ITU-T Recommendations P.56 & P.64: Methods for objective measurement of speech levels and calculation of loudness ratings in telephony.
• ETSI TBR 17: The European source document for these attachment requirements.
• EN 60950: General safety requirements for information technology equipment used in telecommunication applications.

For telecommunications professionals, equipment manufacturers, and regulatory authorities, SIST TBR 017 E1:2004 provides the essential guidelines for designing, testing, and operating 4-wire analogue leased line interfaces in business communication networks, ensuring secure, reliable, and regulatory-compliant connectivity.

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Business TeleCommunications (BTC); Ordinary and Special quality voice bandwidth 4-
wire analogue leased lines (A4O and A4S); Attachment requirements for terminal
equipment interface
Ta slovenski standard je istoveten z: TBR 017 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.

TECHNICAL TBR 17
BASIS for January 1997
REGULATION
Source: ETSI TC-BTC Reference: DTBR/BTC-02040
ICS: 33.020
Key words: ONP, leased line, A4O, A4S
Business TeleCommunications (BTC);
Ordinary and Special quality voice bandwidth
4-wire analogue leased lines (A4O and A4S);
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: [e-mail]
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 1997. All rights reserved.

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TBR 17: 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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TBR 17: January 1997
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 .11
4.2.2.1.1 Sending Loudness Rating.11
4.2.2.2 Equipment with internally generated electrical signals .11
4.2.2.2.1 Maximum mean power .11
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.14
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.20
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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TBR 17: January 1997
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TBR 17: January 1997
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 Terminal Equipment 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 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 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 300 453.
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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TBR 17: January 1997
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TBR 17: January 1997
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 4-wire analogue leased
lines defined by ETS 300 451 and ETS 300 452.
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 4-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 600 Ω. See also subclause A.1.3.
R
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TBR 17: 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
RX Receive is a signal input at either the terminal equipment or the test equipment
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 subclause 3.4)
TX Transmit is a signal output at either the terminal equipment or the test
equipment
W
Sending weighting factor (used in the calculation of SLR)
sn
Z Reference impedance
R
Z Terminating 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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TBR 17: January 1997
Table 1: Contact assignment
Contact number Terminal equipment
1 Unused
2 Unused
3 & 6 Transmit pair (Output port)
4 & 5 Receive pair (Input port)
7 Unused
8 Unused
NOTE: The transmit pair is the output from the terminal equipment. The receive pair is the input
to the terminal equipment as shown in figure 1. Where the terms "output" and "input" are
used without qualification in this standard, they refer to the terminal equipment interface.
OUTPUT
INPUT
TX
RX
TERMINAL
NETWORK
EQUIPMENT
INTERFACE
INTERFACE
RX TX
INPUT OUTPUT
Figure 1: Leased line configuration conventions
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 input and output ports of the terminal equipment
interface shall be greater than or equal to the values given in table 2 and figure 2.
NOTE: The longitudinal conversion loss specifies the unwanted signal detected by the
terminal equipment when a 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
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TBR 17: January 1997
Longitudinal conversion loss dB
300 400 500 600 1000 2000 3400 5000
Frequency Hz
Figure 2: Longitudinal conversion loss, minimum values
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 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. The general categories requiring identification are defined as follows:
a) any terminal equipment where an 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 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).
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 Sending Loudness Rating (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 inter modulation 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).

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TBR 17: January 1997
4.2.2.1 Equipment with an acoustic input
4.2.2.1.1 Sending Loudness Rating
Requirement: The minimum SLR of the terminal equipment, when terminated with the reference
impedance Z , shall be greater than or equal to -1 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 -13 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.
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 1,1 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 3 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 -7 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 -37
A 0,03 -37
B 0,1 -20
C 0,3 -10
D 3,4 -10
E 3,8 -19
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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TBR 17: January 1997
0 0,03 0,1 0,3 3,4 3,8 4,3
Frequency kHz
-10
CD
-19
-20
E
B
-30
A
-37
-40
F
-44
-50
Measurement bandwidth 10 Hz
Not to scale
Maximum
power dBm
Figure 3: 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 d
...