ETSI TBR 001 ed.1 (1995-10)

SLOVENSKI STANDARD
SIST TBR 001 E1:2004
01-oktober-2004
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Terminal Equipment (TE); Attachment requirements for terminal equipment to be
connected to circuit switched data networks and leased circuits using a CCITT
Recommendation X.21 interface, or at an interface physically, functionally and electrically
compatible with CCITT Recommendation X.21 but operating at any data signalling rate
up to, and including, 1 984 kbit/s
Ta slovenski standard je istoveten z: TBR 001 Edition 1
ICS:
33.050.01 Telekomunikacijska Telecommunication terminal
terminalska oprema na equipment in general
splošno
SIST TBR 001 E1:2004 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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TECHNICAL TBR 1
BASIS for October 1995
REGULATION
Source: ETSI TC-TE Reference: DTBR/TE-05001
ICS: 33.040.60
X.21
Key words:
Attachment requirements for terminal equipment to be
connected to circuit switched data networks and leased circuits
using a CCITT Recommendation X.21 interface, or at an
interface physically, functionally and electrically compatible with
CCITT Recommendation X.21 but operating at any data
signalling rate up to, and including, 1 984 kbit/s
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1995. All rights reserved.
New presentation - see History box

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TBR 1: October 1995
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 1: October 1995
Contents
Foreword .5
Introduction.5
1 Scope .7
2 Normative references.7
3 Abbreviations.8
4 TBR-Requirements .8
4.1 Safety.8
4.2 Electro-Magnetic Compatibility (EMC).8
4.3 Physical layer requirements.8
4.3.1 General characteristics.8
4.3.1.1 Types of operation.8
4.3.1.2 Data signalling rate.8
4.3.2 Connector characteristics and contact number assignments .9
4.3.2.1 Connector .9
4.3.2.2 Contact number assignments.9
4.3.3 Generator characteristics .9
4.3.3.1 Generator circuit output voltage.9
5 TBR test specification .10
5.1 Conditions of test .10
5.1.1 Environment for tests .10
5.1.2 Power supply limitations.10
5.1.3 Test state.10
5.1.4 Test point.10
5.1.5 Bit patterns .11
5.1.6 Signal element timing.11
5.1.7 Interchange circuits presentation .11
5.1.8 Physical layer tests.11
5.1.8.1 Verification of the electrical characteristics.11
5.1.8.2 Identically implemented circuits.11
5.1.8.3 Fixed state generators.12
5.2 Test descriptions.12
5.2.1 Connector characteristics and contact number assignments .12
5.2.1.1 Connector characteristics.12
5.2.1.2 Contact number assignments.12
5.2.2 Generator characteristics .12
5.2.2.1 Generator circuit output voltage.12
5.3 TBR 1 Test Case Selection Expression Definition Table.13
5.4 Test case index.14
Annex A (normative): The TBR Requirements Table (TBR-RT).15
A.1 Introduction to the TBR-RT .15
A.2 Format of the tables .15
A.3 Notations used in the TBR-RT .15
A.3.1 Status notations .15
A.3.2 Support answer notations .16
A.4 The TBR Requirement Tables (TBR-RTs).16

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TBR 1: October 1995
Annex B (normative): Physical layer Implementation eXtra Information for Testing (PIXIT). 18
Annex C (informative): Bibliography . 20
History. 21

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TBR 1: October 1995
Foreword
This Technical Basis for Regulation (TBR) has been produced by the Terminal Equipment (TE) Technical
Committee of the European Telecommunications Standards Institute (ETSI).
Introduction
The physical layer requirements contained in this TBR are equivalent to the physical layer requirements
contained in TBR 2 which relate to the connection of a terminal to a Packet Switched Public Data Network
(PSPDN) using CCITT Recommendation X.25 and offering the interface specified in CCITT
Recommendation X.21 [2]. It is recommended that a demonstration of compliance with these
requirements be accepted as a demonstration of compliance with the relevant parts of TBR 2 for the
purpose of determining conformity with that TBR, and vice versa.

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Blank page

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TBR 1: October 1995
1 Scope
This Technical Basis for Regulation (TBR) specifies the technical characteristics (electrical and
mechanical interface requirements, and access control protocol) to be provided by terminal equipment to
be connected to Circuit Switched Public Data Networks (CSPDNs) and leased circuits presented at a
CCITT Recommendation X.21 [2] interface, or at an interface physically, functionally and electrically
compatible with CCITT Recommendation X.21 [2] but operating at any data signalling rate up to, and
including, 1 984 kbit/s. The objective of this TBR is to ensure that no disturbance occurs to the public
network.
This TBR contains the minimum set of requirements derived from CCITT Recommendation X.21 [2], in
accordance with prior European harmonization documents (NET 1). These include circuit switched service
and leased circuits for point-to-point connection for various user classes of service.
NOTE 1: Not all applicable user classes and services are available in all countries.
The multipoint service is not included in the minimum set. Not all optional features and facilities defined in
CCITT Recommendation X.21 [2] are included in the minimum set.
A test is given for each requirement in this TBR, including measurement methods. Requirements apply at
the public network interface of the terminal equipment, which may be stimulated to perform the tests by
additional equipment if necessary.
This TBR also gives guidance on appropriate standards relating to the essential requirements on safety.
Terminal equipment may be subject to additional or alternative requirements in other Common Technical
Regulations (CTRs) depending on its functionality, in particular if it supports a service which is considered
a justified case for regulation of terminal equipment interworking via the public telecommunications
network.
NOTE 2: Although this TBR provides a means of approving terminal equipment for connection
to public networks operating at any data signalling rate in a continuous range up to
1 984 kbit/s, the choice of data signalling rates within this range offered by a particular
public network is determined by the operator of that network.
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] ISO 4903, Second edition (1989): "Information technology - Data communication
- 15-pole DTE/DCE interface connector and contact number assignments".
[2] CCITT Recommendation X.21 (1988): "Interface between data terminal
equipment (DTE) and data circuit-terminating equipment (DCE) for synchronous
operation on public data networks".

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3 Abbreviations
For the purposes of this TBR, the following abbreviations apply:
CTR Common Technical Regulation
DCE Data Circuit-terminating Equipment
DTE Data Terminal Equipment
EMC Electro-Magnetic Compatibility
TBR Technical Basis for Regulation
IUT Implementation Under Test
PIXIT Physical layer implementation eXtra Information for Testing
TBR-RT TBR Requirements Table
4 TBR-Requirements
4.1 Safety
There are no safety requirements under this TBR.
NOTE: Safety requirements are imposed under the Low Voltage Directive (73/23/EEC) and
articles 4 (a) and 4 (b) of Directive 91/263/EEC.
4.2 Electro-Magnetic Compatibility (EMC)
There are no EMC requirements under this TBR.
NOTE: General EMC requirements are imposed under the EMC Directive (89/336/EEC).
4.3 Physical layer requirements
NOTE 1: Since the Data Circuit-terminating Equipment (DCE) presents the same electrical
interface to the terminal equipment regardless of whether the terminal equipment
makes use of balanced or unbalanced interchange circuits, this TBR contains a single
set of physical layer requirements applicable to the terminal equipment for connection
to that interface, and makes no distinction between balanced and unbalanced circuits.
NOTE 2: Interchange circuits meeting the requirements of CCITT Recommendation V.11 will
normally meet the electrical characteristics defined in this TBR. Interchange circuits
meeting the requirements of CCITT Recommendation V.10 may meet the electrical
characteristics defined in this TBR.
4.3.1 General characteristics
4.3.1.1 Types of operation
This TBR is applicable for the following types of operation:
- circuit switched operation;
- leased circuit operation.
4.3.1.2 Data signalling rate
This TBR is applicable for data signalling rates within the range of 0 to 1 984 kbit/s for leased line and
circuit switched services.

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4.3.2 Connector characteristics and contact number assignments
4.3.2.1 Connector
The means of connection to the DCE shall be a male connector conforming to ISO 4903 [1].
NOTE: This requirement is based upon subclause 2.2 of CCITT Recommendation X.21 [2].
Compliance shall be checked by the test given in subclause 5.2.1.1.
Justification: Directive 91/263/EEC, Article 4 (d).
4.3.2.2 Contact number assignments
On the means of connection to the DCE, the presentation of the interchange circuits shall be in
accordance with annex A, table A.1 for both Leased Circuit operation and Circuit Switched operation.
NOTE: This requirement is based upon subclause 2.2 of CCITT Recommendation X.21 [2]
and ISO 4903 [1].
Compliance shall be checked as described in subclause 5.2.1.2.
Justification: Directive 91/263/EEC, Article 4 (d).
4.3.3 Generator characteristics
The following requirements apply to the interchange circuits as presented on the means of connection to
the DCE.
For a particular terminal implementation, the requirements of this subclause apply only to the extent that
they are relevant to a particular generator. For instance, where, in a particular terminal implementation, a
particular generator circuit, in normal operation, is fixed in one of the binary states, only those
requirements relevant to that fixed binary state shall apply.
In this subclause, points A and B are defined as the two physical connections, on the means provided for
connection to the DCE, to which the output of a terminal generator is connected, and point C is the
physical connection (contact number 8) to which the terminal equipment signal ground may optionally be
connected (see figure 1).
4.3.3.1 Generator circuit output voltage
See figure 1.
When a 3 900 ohm non-reactive impedance is connected between points A and B, for each binary state:
a) the magnitude of the voltage between points A and B shall be less than or equal to 12,0 volts;
b) the magnitude of the voltage between either A or B and point C shall be less than or equal to
12,0 volts.

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A
Voa
IVoI <= 12,0 V
Vo R
G
IVoaI <= 12,0 V
Vob
B
IVobI <= 12,0 V
R = 3 900 ohms
C
NOTE: This requirement is based upon subclauses 5.2.1 and 6.3 of CCITT Recommendation
V.11 (1988) and subclauses 5.2.1 and 6.3 of CCITT Recommendation V.10 (1988).
Figure 1
Compliance shall be checked by the test in subclause 5.2.2.
Justification: Directive 91/263/EEC, Article 4 (d).
5 TBR test specification
5.1 Conditions of test
5.1.1 Environment for tests
All tests shall be performed at:
- an ambient temperature in the range 15° C to 35° C;
- a relative humidity in the range 5 % to 75 %;
except that tests shall
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