Electrical safety - Classification of interfaces for equipment to be connected to telecommunication networks

CENELEC Report * Published by former TC 74 * Also published as EG 201 212:1998 *  Superseded by CLC/TR 62102:2005

Electrical safety - Classification of interfaces for equipment to be connected to telecommunication networks

General Information

Status
Withdrawn
Publication Date
29-Nov-1998
Current Stage
6060 - Document made available
Start Date
30-Nov-1998
Completion Date
30-Nov-1998

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SLOVENSKI STANDARD
SIST R0BT-002:2002/EG 201 212:2002
01-september-2002

Electrical safety - Classification of interfaces for equipment to be connected to

telecommunication networks

Electrical safety - Classification of interfaces for equipment to be connected to

telecommunication networks
Ta slovenski standard je istoveten z: R0BT-002:1998
ICS:
33.040.01 Telekomunikacijski sistemi Telecommunication systems
na splošno in general
35.200 Vmesniška in povezovalna Interface and interconnection
oprema equipment
SIST R0BT-002:2002/EG 201 212:2002 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST R0BT-002:2002/EG 201 212:2002
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SIST R0BT-002:2002/EG 201 212:2002
R0BT-002/EG 201 212
V1.2.1 (1998-11)
CENELEC Report/ETSI Guide
Electrical safety;
Classification of interfaces for equipment
to be connected to telecommunication networks
CENELEC
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SIST R0BT-002:2002/EG 201 212:2002
22 R0BT-002/EG 201 212 V1.2.1 (1998-11)
Reference
DEG/SAFETY-000001 (b8000ioq.PDF)
Keywords
Safety, interface, transient, terminal, UNI,
telephony, network, environment
ETSI
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Internet
Internet
http://www.cenelec.be
secretariat@etsi.fr
Individual copies of this ETSI deliverable
can be downloaded from
http://www.etsi.org
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 1998.
© Comité Européen de Normalisation Electrotechnique 1998.
All rights reserved.
CENELEC / ETSI
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SIST R0BT-002:2002/EG 201 212:2002
33 R0BT-002/EG 201 212 V1.2.1 (1998-11)
Contents

Intellectual Property Rights................................................................................................................................4

Foreword ............................................................................................................................................................4

Introduction ........................................................................................................................................................4

1 Scope........................................................................................................................................................5

2 References................................................................................................................................................5

3 Definitions and abbreviations ..................................................................................................................6

3.1 Definitions ......................................................................................................................................................... 6

3.2 Abbreviations..................................................................................................................................................... 7

4 Reference configuration...........................................................................................................................7

5 Safety categories of interfaces provided for connection to a Telecommunications Network .................9

5.1 SELV circuits..................................................................................................................................................... 9

5.2 TNV circuits ...................................................................................................................................................... 9

5.3 User Information.............................................................................................................................................. 10

6 Phenomena affecting the safety of interface ports.................................................................................10

6.1 Unexposed environment .................................................................................................................................. 10

6.2 Exposed environment....................................................................................................................................... 10

7 Determination of Circuit Type...............................................................................................................10

Annex A: Consideration of interface phenomenon ............................................................................12

Annex B: Worked examples of certain network interfaces...............................................................14

Annex C: Conditions for an unexposed environment ........................................................................15

Annex D: Voltage ranges of SELV and TNV CIRCUITS..................................................................16

Bibliography.....................................................................................................................................................17

History..............................................................................................................................................................18

CENELEC / ETSI
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SIST R0BT-002:2002/EG 201 212:2002
44 R0BT-002/EG 201 212 V1.2.1 (1998-11)
Intellectual Property Rights

IPRs essential or potentially essential to the present document may have been declared to ETSI. The information

pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found

in SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in

respect of ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on

the ETSI Web server (http://www.etsi.fr/ipr or http://www.etsi.org/ipr).

Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee

can be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server)

which are, or may be, or may become, essential to the present document.
Foreword

This joint CENELEC Report / ETSI Guide (EG) has been produced under the joint responsibility of the European

Committee for Electrotechnical Standardization (CENELEC) TC74 WG1 and the European Telecommunications

Standards Institute (ETSI).

This document is a guide to the determination of the interface requirements for equipment in terms of safety. It lists a

number of interfaces and indicates the safety category of each listed interface. This document does not contain sufficient

detail for conformance testing purposes, except when used in conjunction with product standards such as EN 60950.

This document replaces ETSI Technical Report (ETR) 012 (1992).

The information herein aligns with changes made to EN 60950 since time of publication of ETR 012.

Introduction

The equipment safety standard EN 60950 specifies the requirements for categories of CIRCUITS as SELV CIRCUITS, TNV

CIRCUITS and HAZARDOUS VOLTAGE circuits (among others). For stand-alone equipment it is a relatively simple matter to

determine the different categories of circuits. However, equipment having data port interfaces is intended to be

connected to other equipment, locally or via a network. In this case, the safety categories of the interfaces which will be

connected together have to be compatible with each other. Furthermore, the category of the interface of the remote

equipment may be unknown. This is the case in systems where telecommunication equipment and data processing

equipment are connected together via different types of interfaces and networks.

To overcome this situation, it is necessary to classify the interfaces of equipment in such configurations according to the

application, and to select the safety category for the interfaces of the equipment and for the type of the network.

Similarly, the interfaces have to be classified for protection against damage of the equipment and of the network.

Aspects of protection are dealt with in certain ETSI documents and the ITU-T K series of Recommendations.

The present document only covers equipment appropriately interconnected. Furthermore, it does not address damage

caused by one equipment to other equipment with which it is connected. Exceptionally, interfaces may be designed for

higher or lower levels of protection for special applications. In such cases one has to ensure that only interfaces having

compatible safety categories and protection levels are connected together. These are based on the available

specifications of the equipment manufacturers and network providers, and on information regarding the installation

category of the mains interface.

The present document is intended to be used by: Equipment Designers, Network Operators (NOs), Network

Regulators/Authorities, Standards Writers and Network Installers. The present document is applicable to various

interfaces of equipment. Networks are not "equipment" within the meaning of EN 60950 and so are not covered by this

document. However, it is necessary to consider the characteristics, installation and presentation of

TELECOMMUNICATIONS NETWORKs when determining what equipment interface requirements apply (e.g. SELV CIRCUIT,

TNV CIRCUIT TNV CIRCUIT TNV CIRCUIT

-1 , -2 , -3 etc. See EN 60950, annex V, abbreviated in this document as annex D).

If there is a conflict between the present document and a more detailed specification, the latter prevails.

CENELEC / ETSI
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SIST R0BT-002:2002/EG 201 212:2002
55 R0BT-002/EG 201 212 V1.2.1 (1998-11)
1 Scope

The present document applies to equipment interfaces. These interfaces within the equipment may be connected to

TELECOMMUNICATIONS NETWORKS, or they may form part of the TELECOMMUNICATIONS NETWORK infrastructure, or

they may provide localized transfer of data. The present document provides guidance on the classification of interfaces

in accordance with the circuit types defined in EN 60950 and EN 41003 following an analysis of the telecommunication

network's characteristics.

If a standard other than EN 60950 is used for designing the equipment and its interface (e.g. EN 41003 in conjunction

with other product safety standards), then the corresponding requirements of these other standards are to be preferred.

The present document applies regardless of ownership or responsibility for installation and maintenance of the

equipment or network.

Examples of equipment covered by the present document include, but are not limited to:

facsimile machines, key telephone systems, network billing equipment, PABXs, network supervisory equipment,

telephone answering machines, network switching equipment, network transmission equipment, network terminating

equipment, modems, telephone sets, and network power feeding equipment.

NOTE: Terminal Equipment is often connected to customer premises cabling when used in a business

environment and there are ENs covering such cabling.
2 References

The following documents contain provisions which, through reference in this text, constitute provisions of the present

document.

• References are either specific (identified by date of publication, edition number, version number, etc.) or

non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, subsequent revisions do apply.

• A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same

number.

EN 60950 (1992), including A1 (1993), A2 (1993), A3 (1995), A4 (1997) and A11 (1997): "Safety of information

technology equipment".

EN 60065 (1998): "Audio, video and similar electronic apparatus - Safety requirements".

EN 41003: "Particular safety requirements for equipment to be connected to telecommunications networks".

HD 384 series: "Electrical installation of buildings". (IEC 60364 series, modified)

HD 625.1 S1: "Insulation co-ordination for equipment within low voltage systems; Part 1: Principles, requirements and

tests". (IEC 60664-1)

prEN 50174-1: "Information technology - Cabling installation; Part 1: Specification and quality assurance planning".

prEN 50174-2: "Information technology - Cabling installation; Part 2: Installation planning and practices inside

buildings".

prEN 50174-3: "Information technology - Cabling installation; Part 3: Installation planning and practices external to

buildings".
CENELEC / ETSI
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SIST R0BT-002:2002/EG 201 212:2002
66 R0BT-002/EG 201 212 V1.2.1 (1998-11)

ETS 300 253: "Equipment Engineering (EE); Earthing and bonding of telecommunication equipment in

telecommunication centres".

ETS 300 001: "Attachments to Public Switched Telephone Network (PSTN); General technical requirements for

equipment connected to an analogue subscriber interface in the PSTN; Chapter 1: General".

ETS 300 012: "Integrated Services Digital Network (ISDN); Basic user-network interface Layer 1 specification and test

principles".

ETS 300 132-2: "Equipment Engineering (EE); Power supply interface at the input to telecommunications equipment;

Part 2: Operated by direct current (dc)"

ETS 300 247: "Business Telecommunications (BT); Open Network Provision (ONP) technical requirements; 2 048

kbit/s digital unstructured leased line (D2048U) Connection characteristics"

ETS 300 418: "Business TeleCommunications (BTC); 2 048 kbit/s digital unstructured and structured leased lines

(D2048U and D2048S); Network interface presentation".

TBR 3: "Integrated Services Digital Network (ISDN); Attachment requirements for terminal equipment to connect to an

ISDN using ISDN basic access".

IEC 61312-1: "Protection against lightning electromagnetic impulse; Part 1: General principles".

CA/1209/DV (1998): "Guide on the Safety of Multimedia Equipment" (Draft IEC Guide 112).

ISO/IEC 8802-3: "Information technology - Telecommunications and information exchange between systems - Local

and metropolitan area networks - Specific requirements - Part 3: Carrier sense multiple access with collision detection

(CSMA/CD) access method and physical layer specifications".

ITU-T Recommendation K.20: "Resistibility of telecommunication switching equipment to overvoltages and

overcurrents".

ITU-T Recommendation K.21: "Resistibility of subscribers' terminals to overvoltages and overcurrents".

ITU-T Recommendation K.27: "Bonding configurations and earthing inside a telecommunication building".

ITU-T Recommendation K.31: "Bonding configurations and earthing of telecommunication installations inside a

subscriber's building".

ITU-T Recommendation G.703: "Physical/electrical characteristics of hierarchical digital interfaces".

ITU-T Recommendation V.28: "Electrical characteristics for unbalanced doubled-current interchange circuits".

3 Definitions and abbreviations
3.1 Definitions

NOTE 1: In common with EN 60950, defined terms are shown throughout in SMALL CAPITALS.

For the purposes of the present document, the following definitions apply in addition to the following definitions of

EN 60950:

TELECOMMUNICATIONS NETWORK, SELV CIRCUIT, SECONDARY CIRCUIT, PRIMARY CIRCUIT, TNV CIRCUIT (including TNV-1

CIRCUIT, TNV-2 CIRCUIT, TNV-3 CIRCUIT), HAZARDOUS VOLTAGE.

ANTENNA INTERFACE: A port for connection of a radio frequency antenna to equipment.

CENELEC / ETSI
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SIST R0BT-002:2002/EG 201 212:2002
77 R0BT-002/EG 201 212 V1.2.1 (1998-11)

COAXIAL CABLE INTERFACE: A port for connection of a coaxial cable (providing for asymmetrical transmission) to

equipment.

NOTE 2: In the present document, indoor and outdoor coaxial cables are considered separately.

SYMMETRICAL CABLE INTERFACE: A port for connection of a cable providing for symmetrical transmission (e.g.

twisted pair) to equipment.

NOTE 3: For the purposes of the present document, the use of both indoor and outdoor twisted pair cables is

considered separately.

NETWORK TERMINATION POINT The physical point at the boundary of a network intended to accept the connection of

a terminal equipment or to be interconnected to another network.

TERMINAL CONNECTION POINT: The physical point of the terminal equipment intended to be connected to a network.

A.C. MAINS SUPPLY: The external A.C. power distribution system supplying power to the equipment. Sources of power

include public or private utilities and, unless otherwise specified in EN 60950, equivalent sources such as motor-driven

generators and uninterruptible power supplies.

NOTE 4: The above definition has been derived from the draft 3 edition of IEC 60950/EN 60950.

3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
A.C. Alternating Current
D.C. Direct Current
ISDN Integrated Services Digital Network
LAN Local Area Network
LPZ Lightning Protection Zone
NO Network Operator
NCP Network Connection Point
NT Network Termination
NTP Network Termination Point
NTU Network Terminating Unit
PABX Private Automatic Branch Exchange
PNO Public Network Operator
PSTN Public Switched
...

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