SIST TBR 012 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 012 ed.1 (1993-12) - Business Telecommunications (BT); Open Network Provision (ONP) technical requirements; 2 048 kbit/s digital unstructured leased line (D2048U) Attachment requirements for terminal equipment interface

SIST TBR 012 E1:2004 is a SIST adoption of ETSI TBR 012 Edition 1 for Business Telecommunications (BT) and Open Network Provision (ONP). It specifies the attachment requirements and test principles for terminal equipment interfaces used on 2 048 kbit/s digital unstructured leased lines (D2048U), for engineers, test labs, suppliers, and buyers checking interface compliance.

What does SIST TBR 012 E1:2004 specify?

SIST TBR 012 E1:2004 specifies how a terminal equipment interface is attached to an ONP 2 048 kbit/s digital unstructured leased line using a 120 ohm interface. It covers the essential physical and electrical characteristics needed for access, together with test principles for checking compliance.

The document is organized into scope, normative references, definitions, symbols and abbreviations, and requirements in Clause 5. It then gives normative test methods in Annex A, the HDB3 code definition in Annex B, and an informative bibliography in Annex C.

Annex	What it covers
Annex A	Normative test methods for signal coding, waveform shape, clock accuracy, and jitter
Annex B	Normative definition of HDB3 code
Annex C	Informative bibliography and related directives and standards

What are the key requirements of SIST TBR 012 E1:2004?

Clause 5 says the D2048U is a bidirectional point-to-point digital leased line with a usable bit rate of 2 048 kbit/s, but timing is not provided by the network. In practice, the user is responsible for circuit timing and for any structuring of the data.

Physical interface

Clause 5.1 requires the terminal equipment to provide an 8-contact plug of the type specified in ISO/IEC 10173, with the contact assignments shown in Table 1. Contacts 1 and 2 are the receive pair, 4 and 5 are the transmit pair, and 3 and 6 are shield reference points. This matters because the equipment must mate correctly with the network termination point and the shield must be connected in the intended way.

Clause 5.1 also allows an alternative connection method. The note explains that this is mainly for hardwired presentations of the leased line, using insulation displacement terminals and solid conductors in the stated range. That matters when the equipment is installed without the standard plug and cord arrangement.

Output coding and waveform

Clause 5.2.1.1 requires the output signal to use High Density Bipolar code of order 3 (HDB3), with Annex B defining the code. In practice, the transmitter must insert the correct bipolar violations so the line signal remains compatible with the defined interface.

Clause 5.2.1.2 requires the output pulse shape to match Table 2 and Figure 2, based on CCITT Recommendation G.703. The test load is 120 ohms non-reactive, the nominal peak voltage of a mark is 3 volts, and the space level is near zero within the stated tolerance. This matters because the interface has to fit the expected electrical mask, not just the right bit rate.

Clock accuracy and jitter

Clause 5.2.1.3 requires a TE with an internal clock to hold 2 048 kbit/s within ±50 ppm when no external reference timing is present. That means the local oscillator has to be accurate enough to keep the line rate within a tight tolerance.

Clause 5.2.1.4 limits peak-to-peak output jitter when measured with first-order linear filters between 40 Hz and 100 kHz. The table gives the maximum as 0.11 UI peak-to-peak. In practice, the transmitter must not distort timing so much that downstream equipment loses margin.

Protection on mains-powered equipment

Clauses 5.4.1 to 5.4.3 cover overvoltage protection when the terminal equipment is supplied from the mains. They limit the voltage transferred to the terminal equipment interface under common-mode and transverse-mode surge tests, and also limit conversion from common mode to transverse mode. This matters for equipment design because surge coupling from the power side must not endanger the leased-line interface.

What terms does SIST TBR 012 E1:2004 define?

Open Network Provision (ONP) is the regulatory framework for harmonized leased-line access and use across public telecommunications networks.

D2048U means the 2 048 kbit/s digital unstructured ONP leased line covered by this TBR.

Network Termination Point (NTP) is the public-network connection point and its technical access specification that allows access to the network.

Terminal Equipment (TE) is equipment intended to connect to the public telecommunications network to send, process, or receive information.

High Density Bipolar code of order 3 (HDB3) is the modified AMI line code used for the output signal, with blocks of four zeros replaced according to the defined rule.

Pseudo Random Bit Sequence (PRBS(2 -1)) is the test bit sequence referenced for signal and jitter testing.

Unit Interval (UI) is the time of one bit interval and is used to express jitter limits.

Who uses SIST TBR 012 E1:2004?

Telecommunications equipment manufacturers use this standard when designing terminal equipment for connection to ONP leased lines. It tells them the physical connector, line coding, pulse shape, timing accuracy, and jitter limits to build around.

Test laboratories and conformity assessment bodies use it to verify compliance with the required attachment characteristics and the test methods in Annex A. Procurement teams, quality managers, and network operators use it when checking whether a product is suitable for connection to a 2 048 kbit/s unstructured leased line.

Installers and system integrators also use it when equipment is supplied with an alternative connection method or when the shield and line pair must be wired to match the interface.

What changed in SIST TBR 012 E1:2004 from the previous edition?

SIST TBR 012 E1:2004 corresponds to TBR 012 Edition 1, first issued in December 1993. The document history in the standard records that first edition and a later PDF conversion.

Which standards are used with SIST TBR 012 E1:2004?

CCITT Recommendation O.151 defines the PRBS(2 -1) used in the test methods.

ETS 300 046-3 provides the protection test methods used for the overvoltage requirements in Clause 5.4.

ISO/IEC 10173 defines the 8-contact connector used for the terminal equipment interface.

CCITT Recommendation G.703 is the electrical basis for the line interface, including the pulse shape and HDB3-related requirements.

ETS 300 166 qualifies G.703 for 2 048 kbit/s hierarchical digital interfaces and is part of the stated basis for this TBR.

ETS 300 248 is the corresponding ONP technical requirements document of which this TBR is a subset.

What does the SIST TBR 012 E1:2004 document contain?

The document contains one connector assignment table, one pulse-mask table, one jitter-limit table, and one input-jitter table. It also includes figures for the interface direction, the output pulse mask, the clock accuracy setup, and the jitter measurement setup.

Annex A gives practical conformance tests for HDB3 coding, waveform shape, clock accuracy, and output jitter. Annex B defines the HDB3 code rule used by the interface. These parts are the core references for design verification, type testing, and compliance checking.

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Business Telecommunications (BT); Open Network Provision (ONP) technical
requirements; 2 048 kbit/s digital unstructured leased line (D2048U) Attachment
requirements for terminal equipment interface
Ta slovenski standard je istoveten z: TBR 012 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 12
BASIS for December 1993
REGULATION
Source: ETSI TC-BT Reference: DTBR/BT-02036
ICS: 33.040.40
ONP, leased lines, D2048U
Key words:
Business Telecommunications (BT);
Open Network Provision (ONP) technical requirements;
2 048 kbit/s digital unstructured leased line (D2048U)
Attchment requirements for terminal equipment
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 1993. All rights reserved.
New presentation - see History box

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TBR 012: December 1993
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 Standards Approval Dept." at the address shown on the title page.

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TBR 012: December 1993
Contents
Foreword.5
Introduction .5
1 Scope .7
2 Normative references .7
3 Definitions. 7
4 Symbols and abbreviations.8
5 Requirements.8
5.1 Physical characteristics .8
5.2 Electrical characteristics .9
5.2.1 Output port. 9
5.2.1.1 Signal coding.9
5.2.1.2 Waveform shape .9
5.2.1.3 Clock accuracy. 10
5.2.1.4 Output jitter. 11
5.2.2 Input port. 12
5.3 Safety. 12
5.4 Overvoltage protection . 12
5.4.1 Impulse transfer from mains, common mode . 12
5.4.2 Impulse transfer from mains, transverse mode . 12
5.4.3 Conversion of common mode to transverse mode. 12
5.5 Electro-magnetic compatibility. 13
Annex A (normative): Test methods . 14
A.1 General . 14
A.1.1 Equipment connection. 14
A.1.2 Test environment. 14
A.2 Test methods. 15
A.2.1 Signal coding at output port. 15
A.2.2 Waveform shape at output port . 15
A.2.3 Clock accuracy at the output port. 16
A.2.4 Jitter . 17
Annex B (normative): Definition of HDB3 code. 19
B.1 General . 19
B.2 Definition .19
Annex C (informative): Bibliography. 20
History. 21

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TBR 012: December 1993
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TBR 012: December 1993
Foreword
This Technical Basis for Regulation (TBR) has been produced by the Business Telecommunications (BT)
Technical Committee of the European Telecommunications Standards Institute (ETSI) and was adopted
after having passed through the ETSI standards approval procedure.
This TBR results from a mandate from the Commission of the European Community (CEC) to provide
harmonised standards for the support of the Second Phase Directive (91/263/EEC).
This TBR is based on information from CCITT 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 harmonisation of conditions for open and efficient access to, and use of, the leased lines
provided on public telecommunications networks and the availability throughout the Community (EEC) of a
minimum set of leased lines with harmonised technical characteristics.
The consequence of the Directive is that Telecommunications Organisations within the EEC 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 Telecommunications 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 300 248 (1993).
CCITT Recommendation G.703 (1991), as qualified by ETS 300 166 (1993), is used as the basis for the
terminal interface.
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TBR 012: December 1993
Blank page
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TBR 012: December 1993
1 Scope
This TBR specifies the attachment requirements and corresponding test principles for a terminal equipment
interface for connection to the network termination points of ONP 2 048 kbit/s digital unstructured leased
lines using 120 ohm interfaces.
The term "attachment requirements" in the context of this TBR describes the essential requirements for
access which have to be fulfilled under 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 2 048 kbit/s unstructured
leased line. 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 or 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] CCITT Recommendation O.151 (1988), § 2.1: "Error performance measuring
equipment for digital systems at the primary rate and above".
[2] ETS 300 046-3 (1992): "Integrated Services Digital Network (ISDN); Primary
rate access - safety and protection, Part 3: Interface I - protection".
a
[3] ISO/IEC 10173 (1991): "Information technology - Integrated Services Digital
Network (ISDN) primary access connector at reference points S and T".
NOTE: This TBR also contains a number of informative references which have been included to
indicate the sources from which various 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
For the purposes of this TBR, the following definitions apply:
Leased lines: the telecommunications facilities provided by a public telecommunications 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.
Safety Extra-Low Voltage (SELV) circuit: a secondary circuit which is so designed and protected that
under normal and single fault conditions the voltage between any two accessible parts, or between one
accessible part and the equipment protective earthing terminal for a class I equipment, does not exceed a
safe value (subclause 1.2.8.5 of EN 60950).
Terminal Equipment (TE): equipment intended to be connected to the public telecommunications network,
i.e.:
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TBR 012: December 1993
a) to be connected directly to the termination of a public telecommunication network; or
b) to interwork with a public telecommunications network being connected directly or
indirectly to the termination of a public telecommunications network,
in order to send, process, or receive information.
4 Symbols and abbreviations
For the purposes of this TBR, the following abbreviations apply:
AC Alternating Current
D2048U 2 048 kbit/s digital unstructured ONP leased line
DC Direct Current
EMC Electro-Magnetic Compatibility
HDB3 High Density Bipolar code of order 3 (see Annex B)
ONP Open Network Provision
PRBS(2 -1) Pseudo Random Bit Sequence (as defined in § 2.1 of CCITT Recommendation
O.151 [1])
RX Receive (a signal input at either the terminal equipment interface or the test
equipment)
TX Transmit (a signal output at either the terminal equipment interface or the test
equipment)
UI Unit Interval
5 Requirements
The 2 048 kbit/s unstructured leased line provides a bidirectional point-to-point digital leased line with a
usable bit rate of 2 048 kbit/s where timing is not provided from the network. The provision of circuit timing
is the responsibility of the user. No structuring of the data is provided by the network and any structuring is
the responsibility of the user.
5.1 Physical characteristics
Requirement: The terminal equipment shall provide an 8-contact plug of the type specified in
ISO/IEC 10173 [3] with contact assignments as specified in table 1. In addition, the terminal equipment
may provide an alternative method of connection.
NOTE 1: The use of a shielded cord or cable may be necessary to meet radiation and immunity
requirements defined in Electro-Magnetic Compatibility (EMC) standards.
NOTE 2: The alternative connection method is primarily for the purpose of permitting hardwired
presentations of the leased line using insulation displacement terminals and wire with
solid conductors having diameters in the range 0,4 to 0,6 mm.
Test: There shall be a visual inspection that the plug is of the correct type. The contact assignments are
tested indirectly through the tests in Annex A.

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TBR 012: December 1993
Table 1: Contact assignment
Contact Terminal interface
1 & 2 Receive pair
3 Shield reference point
4 & 5 Transmit pair
6 Shield reference point
7 Unused
8 Unused
NOTE 1: The transmit pair is the output from the terminal equipment interface. The receive pair is the
input to the terminal equipment interface, 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.
NOTE 2: For connection of the shield, or shields, to the common reference point at the NTP contacts 3
and 6 shall be used.
�˝˝˝˝˝˝˝˝˝˝˝˝» OUTPUT        INPUT �˝˝˝˝˝˝˝˝˝˝˝˝»
”     TX ˙˜˜˜˜˜˜˜˜˜˜˜˜˜>˜˜˜˜˜˜˜˜˜˜˜˜˜˜¶ RX     ”
” NETWORK  ˙˜˜˜˜˜˜˜˜˜˜˜˜˜>˜˜˜˜˜˜˜˜˜˜˜˜˜˜¶ TERMINAL ”
” INTERFACE ”              ” EQUIPMENT ”
”      ˙˜˜˜˜˜˜˜˜˜˜˜˜˜<˜˜˜˜˜˜˜˜˜˜˜˜˜˜¶      ”
”     RX ˙˜˜˜˜˜˜˜˜˜˜˜˜˜<˜˜˜˜˜˜˜˜˜˜˜˜˜˜¶ TX     ”
¨˝˝˝˝˝˝˝˝˝˝˝˝… INPUT        OUTPUT ¨˝˝˝˝˝˝˝˝˝˝˝˝…
Figure 1
5.2 Electrical characteristics
5.2.1 Output port
5.2.1.1 Signal coding
Requirement: Coding of the digital signal transmitted at the output port shall be in accordance with High
Density Bipolar code of order 3 (HDB3) encoding rules (see Annex B).
Test: The test shall be conducted according to Annex A, subclause A.2.1.
5.2.1.2 Waveform shape
Requirement: The pulse at the output port shall comply with the requirements given in table 2 and figure 2,
based on CCITT Recommendation G.703.
Test: The test shall be conducted according to Annex A, subclause A.2.2.

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TBR 012: December 1993
Table 2: Waveform shape at output port
Pulse shape All marks of a valid signal must conform
(nominally rectangular) with the mask (see figure 2) irrespective
of the polarity. The value V corresponds
to the nominal peak voltage of a mark.
Test load impedance 120 ohms non-reactive
Nominal peak voltage V of a mark 3 volts
Peak voltage of a space 0 ± 0,3 volts
Nominal pulse width 244 ns
Ratio of the amplitudes of positive and negative 0,95 to 1,05
pulses at the centre of the pulse interval
Ratio of the widths of positive and negative 0,95 to 1,05
pulses at the nominal half amplitude
269 ns
(244 + 25)
20%
10%
194 ns
V=100%
10%
(244 - 50)
20%
Nominal pulse
50%
244 ns
219 ns
10%
10%
(244 - 25)
0%
10%
10%
20%
488 ns
(244 + 244)
Figure 2: Pulse mask for 2 048 kbit/s pulse
5.2.1.3 Clock accuracy
Requirement: Where a Terminal Equipment (TE) has an internal clock, in the absence of any external
reference signal timing, the output port shall have a bit rate of 2 048 kbit/s ± 50 ppm.
Test: The test shall be conducted according to Annex A, subclause A.2.3.

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TBR 012: December 1993
5.2.1.4 Output jitter
Requirement: The peak-to-peak output jitter shall not exceed the limits of table 3 when measured with
first order linear filters with the defined cut-off frequencies. For the purpose of testing, any signal input
from which the output timing is derived shall be provided with the maximum tolerable input jitter, and with
the maximum tolerable input frequency deviation, as specified by the manufacturer.
Where the output timing of the terminal equipment is taken from the leased line, the input to the terminal
equipment shall be provided with components of sinusoidal jitter at points on the curve of figure 3 and
table 4.
NOTE: A separate requirement for output jitter at frequencies in the range 4 Hz to 40 Hz is not
required because this frequency band is covered sufficiently by the first order linear
filter which produces 20 dB attenuation at 4 H
...