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International Telecommunication Union

ITU-T

K.44

TELECOMMUNICATION

STANDARDIZATION SECTOR

OF ITU

(05/2012)

SERIES K: PROTECTION AGAINST INTERFERENCE

Resistibility tests for telecommunication

equipment exposed to overvoltages and

overcurrents – Basic Recommendation

Recommendation ITU-T K.44

ii Rec. ITU-T K.44 (05/2012)

FOREWORD

The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of

telecommunications, information and communication technologies (ICTs). The ITU Telecommunication

Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical,

operating and tariff questions and issuing Recommendations on them with a view to standardizing

telecommunications on a worldwide basis.

The World Telecommunication Standardization Assembly (WTSA), which meets every four years,

establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on

these topics.

The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1.

In some areas of information technology which fall within ITU-T's purview, the necessary standards are

prepared on a collaborative basis with ISO and IEC.

NOTE

In this Recommendation, the expression "Administration" is used for conciseness to indicate both a

telecommunication administration and a recognized operating agency.

Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain

mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the

Recommendation is achieved when all of these mandatory provisions are met. The words "shall" or some

other obligatory language such as "must" and the negative equivalents are used to express requirements. The

use of such words does not suggest that compliance with the Recommendation is required of any party.

INTELLECTUAL PROPERTY RIGHTS

ITU draws attention to the possibility that the practice or implementation of this Recommendation may

involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence,

validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others

outside of the Recommendation development process.

As of the date of approval of this Recommendation, ITU had not received notice of intellectual property,

protected by patents, which may be required to implement this Recommendation. However, implementers

are cautioned that this may not represent the latest information and are therefore strongly urged to consult the

TSB patent database at http://www.itu.int/ITU-T/ipr/.

 ITU 2013

prior written permission of ITU.

Rec. ITU-T K.44 (05/2012) iii

Table of Contents

Page

1 Scope ............................................................................................................................ 1

2 References..................................................................................................................... 1

3 Definitions, abbreviations and symbols ........................................................................ 2

3.1 Definitions ...................................................................................................... 2

3.2 Abbreviations and acronyms .......................................................................... 6

3.3 Symbols .......................................................................................................... 8

4 Overvoltage and overcurrent conditions ....................................................................... 8

5 Resistibility requirements ............................................................................................. 9

5.1 Basic resistibility requirement ........................................................................ 9

5.2 Enhanced resistibility requirement ................................................................. 9

6 Equipment boundary ..................................................................................................... 10

7 Test conditions .............................................................................................................. 10

7.1 Interface ports ................................................................................................. 10

7.1.1 Port classification ........................................................................................... 10

7.1.2 Interface ports ................................................................................................. 10

7.2 Test types ........................................................................................................ 10

7.2.1 Transverse/differential .................................................................................... 11

7.2.2 External port to earth ...................................................................................... 11

7.2.3 External port to external port .......................................................................... 11

7.2.4 Internal port to earth ....................................................................................... 12

7.3 Test conditions ................................................................................................ 12

7.4 Test schematics ............................................................................................... 14

8 Protection coordination ................................................................................................. 14

8.1 General ........................................................................................................... 14

8.2 Lightning ........................................................................................................ 14

8.2.1 Primary SPDs with a switching characteristic ................................................ 14

8.2.2 Primary SPDs with a clamping characteristic ................................................ 14

8.3 Power induction, earth potential rise and power contact ................................ 15

8.4 Special test protector ...................................................................................... 15

8.4.1 Switching type protector ................................................................................. 15

8.4.2 Clamping type protector ................................................................................. 15

8.4.3 Multistage modules ........................................................................................ 15

8.5 Selection of the agreed primary protector ...................................................... 15

9 Acceptance criteria ....................................................................................................... 15

剩余141页未读，继续阅读

wqxyx

2014-02-14

正需要这样的资料来参考。

kaomh

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