SIST TBR 001 E1:2004
(Main)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
- Abstract
Technical characteristics of terminal equipment employing CCITT Recommendation X.21 interface which is capable of connection to circuit switched public data networks and leased circuits
- Status
- Published
- Publication Date
- 30-Sep-2004
- Technical Committee
- SPS - Signalling protocols and switching
- 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-237A
SIST TBR 001 E1:2004 is a SIST standard for terminal equipment that connects to circuit switched public data networks and leased circuits using a CCITT Recommendation X.21 interface, or a physically, functionally and electrically compatible interface up to 1 984 kbit/s. It specifies the attachment requirements, the test approach, and the information needed to assess whether the terminal equipment fits the public network interface without causing disturbance.
The standard is aimed at people who design, test, approve, or buy terminal equipment for X.21-based network connections.
What does SIST TBR 001 E1:2004 specify?
SIST TBR 001 E1:2004 specifies the technical characteristics for terminal equipment connected to Circuit Switched Public Data Networks (CSPDNs) and leased circuits at a CCITT Recommendation X.21 interface, or at a compatible interface operating up to and including 1 984 kbit/s. It covers electrical and mechanical interface requirements, access control protocol, and the tests used to check them.
The scope focuses on the public network interface of the terminal equipment. It also states that the objective is to avoid disturbance to the public network, and that the standard gives a minimum set of requirements derived from CCITT Recommendation X.21.
The document is organized into a short requirements part and a test specification, followed by proformas and references.
| Annex | What it covers |
|---|---|
| Annex A | The TBR Requirements Table (TBR-RT), including requirement status, support answers, and contact assignments |
| Annex B | Physical layer Implementation eXtra Information for Testing (PIXIT) |
| Annex C | Bibliography |
Clause 4 gives the requirements, Clause 5 gives the test specification, Annex A provides the requirement table used for conformance work, and Annex B collects test-related information from the client.
What are the key requirements of SIST TBR 001 E1:2004?
SIST TBR 001 E1:2004 is mainly a physical-layer attachment standard. Its key requirements are about interface type, connector form, pinout, signal levels, and how those points are checked in test.
Safety and EMC
Clause 4.1 states that SIST TBR 001 E1:2004 has no safety requirements, and Clause 4.2 states that it has no Electro-Magnetic Compatibility (EMC) requirements. In practice, that means the standard itself is not the place where safety or EMC approval is assessed, even though other regulations may still apply.
Operation and data signalling rate
Clause 4.3.1 limits the standard to circuit switched operation and leased circuit operation, and it applies to data signalling rates from 0 to 1 984 kbit/s. For a manufacturer, this means the equipment must be matched to those service types and speed ranges if it is to be assessed under this standard.
Connector and contact assignments
Clause 4.3.2.1 requires a male connector conforming to ISO 4903. Clause 4.3.2.2 requires the interchange circuits to appear on the connector contacts exactly as shown in Annex A, Table A.1. In practice, this is the part that defines how the terminal equipment is physically plugged into the DCE and which signals may be present.
Generator output voltage
Clause 4.3.3.1 sets the generator circuit output voltage requirement. When a 3 900 ohm non-reactive impedance is connected between the output points, the measured voltages must stay within the stated limit for each binary state. This matters because it controls the electrical behaviour seen by the network interface and helps avoid interface damage or unreliable signalling.
Test conditions
Clause 5.1 defines how tests are run: ambient temperature, humidity, power supply limits, test state, test point, bit patterns, and signal element timing. For the client, this means the equipment must be presented to the test lab in a controlled and reproducible condition, and the client may need to provide bit patterns or timing support.
Test approach and declarations
Clause 5.1.8.1 allows electrical characteristics to be verified either by the listed tests or, by agreement with the test laboratory, by a declaration of conformance supported by circuit diagrams, component specifications, and other relevant information. Clauses 5.1.8.2 and 5.1.8.3 allow the test scope to be reduced when circuits are identically implemented or when a generator output state is fixed and not relevant. In practice, this avoids unnecessary repeat testing when the design is repetitive or a state cannot occur.
Mandatory and optional use of circuits
Annex A shows which interchange circuits are mandatory, optional, or conditional. It also shows the pin assignments and the generator characteristic that must be checked when the relevant circuits are implemented. For a design team, Annex A is the main checklist for deciding what the equipment must support.
What terms does SIST TBR 001 E1:2004 define?
- DCE (Data Circuit-terminating Equipment) - The network-side equipment that presents the X.21 interface to the terminal equipment.
- DTE (Data Terminal Equipment) - The terminal equipment connected to the network through the defined interface.
- IUT (Implementation Under Test) - The terminal equipment being evaluated in the test setup.
- PIXIT (Physical layer Implementation eXtra Information for Testing) - Client-provided information used to tailor the test work, such as steady-state generators and identically implemented circuits.
- TBR-RT (TBR Requirements Table) - The proforma in Annex A that lists the requirements, their status, and the support answers for a specific implementation.
- EMC (Electro-Magnetic Compatibility) - The compatibility topic named in Clause 4.2, even though this TBR imposes no EMC requirements.
Who uses SIST TBR 001 E1:2004?
SIST TBR 001 E1:2004 is used by terminal equipment manufacturers, test laboratories, conformity assessors, and network operators. Manufacturers use it to design the interface and decide which interchange circuits to implement.
Test laboratories use it to set up the interface test conditions, run the connector and voltage checks, and review the completed TBR-RT and PIXIT information. Buyers and technical reviewers use it to confirm that a product is intended for circuit switched or leased circuit connection through an X.21-type interface.
It is also relevant to anyone checking whether a terminal equipment design matches the public network interface rules for CSPDNs and leased circuits.
What changed in SIST TBR 001 E1:2004 from the previous edition?
SIST TBR 001 E1:2004 is identified as identical to TBR 1 Edition 1. The document history in the underlying text shows First Edition October 1995.
Which standards are used with SIST TBR 001 E1:2004?
The normative references named in SIST TBR 001 E1:2004 are ISO 4903 and CCITT Recommendation X.21. ISO 4903 provides the 15-pole DTE/DCE connector and contact numbering, while CCITT Recommendation X.21 defines the interface between DTE and DCE for synchronous operation on public data networks.
The introduction also relates this TBR to TBR 2 by stating that the physical layer requirements are equivalent to the physical layer requirements in TBR 2 for X.25 connections. That matters because compliance evidence for the physical layer can be relevant to both documents.
What does the SIST TBR 001 E1:2004 document contain?
SIST TBR 001 E1:2004 contains the scope, the normative references, abbreviations, the requirements in Clause 4, and the test specification in Clause 5. It also contains a TBR Test Case Selection Expression Definition Table and a test case index that link requirements to test groups.
Annex A provides the TBR Requirements Table, including the mandatory, optional, conditional, and excluded status markings. Annex B provides the PIXIT proforma used to record implementation-specific test information. Annex C lists bibliographic references that help place the standard in its technical and regulatory context.
The document also includes test descriptions and figures for the connector and generator checks, including the voltage measurement setup used for the generator circuit output voltage test.
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Frequently Asked Questions
SIST TBR 001 E1:2004 is a standardization document published by the Slovenian Institute for Standardization (SIST). Its full title is "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". This standard covers: Technical characteristics of terminal equipment employing CCITT Recommendation X.21 interface which is capable of connection to circuit switched public data networks and leased circuits
Technical characteristics of terminal equipment employing CCITT Recommendation X.21 interface which is capable of connection to circuit switched public data networks and leased circuits
SIST TBR 001 E1:2004 is classified under the following ICS (International Classification for Standards) categories: 33.050.01 - Telecommunication terminal equipment in general. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST TBR 001 E1:2004 is associated with the following European legislation: Standardization Mandates: T-237A. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
SIST TBR 001 E1:2004 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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
Page 2
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.
Page 3
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
Page 5
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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TBR 1: October 1995
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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TBR 1: October 1995
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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TBR 1: October 1995
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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TBR 1: October 1995
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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