Fibre-optic communication subsystem test procedures - Part 4-1: Installed cable plant - Multimode attenuation measurement (IEC 61280-4-1:2019)

This part of IEC 61280 is applicable to the measurement of attenuation of installed optical fibre
cabling plant using multimode optical fibre. This cabling plant can include multimode optical
fibres, connectors, adapters, splices, and other passive devices. The cabling can be installed
in a variety of environments including residential, commercial, industrial, and data centre
premises, as well as outside plant environments. The test equipment used in this document has
one single fibre connector interface or two single fibre connector interfaces.
In this document, the optical fibres that are addressed include sub-categories A1-OMx, where
x = 2, 3, 4 and 5 (50/125 μm) and A1-OM1 (62,5/125 μm) multimode optical fibres, as specified
in IEC 60793-2-10. The attenuation measurements of the other multimode categories can be
made using the approaches of this document, but the source conditions for the other categories
have not been defined.

Prüfverfahren für Lichtwellenleiter-Kommunikationsuntersysteme - Teil 4-1: Lichtwellenleiter-Kabelanlagen - Mehrmoden-Dämpfungsmessungen (IEC 61280-4-1:2019)

Procédures d'essai des sous-systèmes de télécommunication à fibres optiques - Partie 4-1: Installation câblée - Mesure de l'affaiblissement en multimodal (IEC 61280-4-1:2019)

IEC 61280-4-1: 2019 s'applique au mesurage de l'affaiblissement d'une installation câblée en fibre optique utilisant des fibres optiques multimodales. Cette installation câblée peut inclure des fibres multimodales, des connecteurs, des adaptateurs, des épissures et d'autres dispositifs passifs. Le câblage peut être installé dans une diversité d'environnements, notamment dans des locaux résidentiels, commerciaux ou industriels et des centres de traitement de données, ainsi que dans des environnements d'installations extérieures. L'équipement d'essai utilisé dans le présent document possède une ou deux interfaces de connecteur monofibre. Les fibres optiques qui relèvent du présent document comprennent les fibres optiques multimodales des sous-catégories A1-OMx, où x = 2, 3, 4 et 5 (50/125 μm) et A1-OM1 (62,5/125 μm), spécifiées dans l'IEC 60793-2-10. Les mesurages d'affaiblissement des autres catégories multimodales peuvent être réalisés en adoptant les approches du présent document, mais les conditions de la source n'ont pas été définies. Cette troisième édition annule et remplace la deuxième édition parue en 2009. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) modification de l'Annexe F relative au flux inscrit afin de l'harmoniser par rapport à l'IEC TR 62614-2, mais les limites du flux inscrit définies dans les Tableaux F.2 à F.5 ont été conservées en l'état; b) ajout de la méthode des cordons d'équipement à l'Annexe D; c) ajout d'essais des fibres optiques multimodales insensibles aux courbures; d) mise à jour de l'incertitude de mesure; e) définition de configurations de câblage supplémentaires; g) modifications des exigences spectrales dans le Tableau 5. Mots clés : mesurage de l'affaiblissement

Postopki preskušanja optičnega komunikacijskega podsistema - 4-1. del: Vgrajene žične oblike - Meritev mnogorodovnega slabljenja (IEC 61280-4-1:2019)

Ta del standarda IEC 61280 se uporablja za meritve slabljenja vgrajenega optičnega kabelskega omrežja z večrodovnimi optičnimi vlakni. Ta kabelska inštalacija lahko vključuje večrodovna optična vlakna, konektorje, vmesnike, spojnice in druge pasivne naprave. Kable je mogoče položiti v različnih okoljih, vključno z stanovanjskimi, poslovnimi, industrijskimi prostori in prostori podatkovnih centrov, ter tudi v okoljih zunanjih inštalacij. Preskusna oprema, uporabljena v tem dokumentu, ima en vmesnik konektorjev z enojnim vlaknom ali dva vmesnika konektorjev z enojim vlaknom.
Optična vlakna, ki so obravnavana v tem dokumentu, zajemajo podkategoriji večrodovnih optičnih vlaken A1-OMx, pri čemer je x = 2, 3, 4 in 5 (50/125 μm), ter A1-OM1 (62,5/125 μm), kot je opredeljeno v standardu IEC 60793-2-10. Meritve slabljenja drugih večrodovnih kategorij je mogoče izvesti s pristopi iz tega dokumenta, vendar izvirni pogoji za druge kategorije niso opredeljeni.

General Information

Status
Published
Publication Date
02-Sep-2019
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
21-Aug-2019
Due Date
26-Oct-2019
Completion Date
03-Sep-2019

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SLOVENSKI STANDARD
SIST EN IEC 61280-4-1:2019
01-oktober-2019
Nadomešča:
SIST EN 61280-4-1:2010
Postopki preskušanja optičnega komunikacijskega podsistema - 4-1. del: Vgrajene
žične oblike - Meritev mnogorodovnega slabljenja (IEC 61280-4-1:2019)

Fibre-optic communication subsystem test procedures - Part 4-1: Installed cable plant -

Multimode attenuation measurement (IEC 61280-4-1:2019)
Prüfverfahren für Lichtwellenleiter-Kommunikationsuntersysteme - Teil 4-1:
Lichtwellenleiter-Kabelanlagen - Mehrmoden-Dämpfungsmessungen (IEC 61280-4-
1:2019)

Procédures d'essai des sous-systèmes de télécommunication à fibres optiques - Partie 4

-1: Installation câblée - Mesure de l'affaiblissement en multimodal (IEC 61280-4-1:2019)

Ta slovenski standard je istoveten z: EN IEC 61280-4-1:2019
ICS:
33.180.01 Sistemi z optičnimi vlakni na Fibre optic systems in
splošno general
SIST EN IEC 61280-4-1:2019 en

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

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SIST EN IEC 61280-4-1:2019
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SIST EN IEC 61280-4-1:2019
EUROPEAN STANDARD EN IEC 61280-4-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2019
ICS 33.180.01 Supersedes EN 61280-4-1:2009 and all of its
amendments and corrigenda (if any)
English Version
Fibre-optic communication subsystem test procedures - Part 4-1:
Installed cabling plant - Multimode attenuation measurement
(IEC 61280-4-1:2019)
Procédures d'essai des sous-systèmes de Prüfverfahren für Lichtwellenleiter-

télécommunication fibroniques - Partie 4-1: Installation Kommunikationsuntersysteme - Teil 4-1: Lichtwellenleiter-

câblée - Mesure de l'affaiblissement en multimodal Kabelanlagen - Mehrmoden-Dämpfungsmessungen

(IEC 61280-4-1:2019) (IEC 61280-4-1:2019)

This European Standard was approved by CENELEC on 2019-06-26. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 61280-4-1:2019 E
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SIST EN IEC 61280-4-1:2019
EN IEC 61280-4-1:2019 (E)
European foreword

The text of document 86C/1575/FDIS, future edition 3 of IEC 61280-4-1, prepared by SC 86C "Fibre

optic systems and active devices" of IEC/TC 86 "Fibre optics" was submitted to the IEC-CENELEC

parallel vote and approved by CENELEC as EN IEC 61280-4-1:2019.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2020-03-26

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2022-06-26

document have to be withdrawn

This document supersedes EN 61280-4-1:2009 and all of its amendments and corrigenda (if any)

This edition constitutes a technical revision including the following significant technical changes with

respect to the previous edition:

a) changes to Annex F on encircled flux to harmonise with IEC TR 62614-2, but keeping the encircled

flux limits defined in Tables F.2 to F.5 unchanged;
b) addition of an equipment cord method in Annex D;
c) inclusion of testing bend insensitive multimode optical fibre;
d) updates to measurement uncertainty;
e) definition of additional cabling configurations;
f) changes to Table 5 on spectral requirements.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 61280-4-1:2019 was approved by CENELEC as a

European Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards

indicated:
IEC 60793-1-40 NOTE Harmonized as EN IEC 60793-1-40
IEC 60793-2 NOTE Harmonized as EN 60793-2
IEC 60793-2-10 NOTE Harmonized as EN 60793-2-10
IEC 60793-2-50 NOTE Harmonized as EN IEC 60793-2-50
IEC 60794-2-21 NOTE Harmonized as EN IEC 60794-2-21
IEC 61300-3-6 NOTE Harmonized as EN 61300-3-6
IEC 61300-3-45 NOTE Harmonized as EN 61300-3-45
IEC 61745 NOTE Harmonized as EN 61745
IEC 61755-6-2 NOTE Harmonized as EN IEC 61755-6-2
IEC 62664-1-1 NOTE Harmonized as EN 62664-1-1
IEC 62614:2010 NOTE Harmonized as EN 62614:2010 (not modified)
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SIST EN IEC 61280-4-1:2019
EN IEC 61280-4-1:2019 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60825-2 - Safety of laser products - Part 2: Safety of EN 60825-2 -
optical fibre communication systems
(OFCS)
IEC 61280-1-3 - Fibre optic communication subsystem test EN 61280-1-3 -
procedures - Part 1-3: General
communication subsystems - Central
wavelength and spectral width
measurement
IEC 61280-1-4 - Fibre optic communication subsystem test EN 61280-1-4 -
procedures - Part 1-4: General
communication subsystems - Light source
encircled flux measurement method
IEC 61300-3-35 - Fibre optic interconnecting devices and EN 61300-3-35 -
passive components - Basic test and
measurement procedures - Part 3-35:
Examinations and measurements - Visual
inspection of fibre optic connectors and
fibre-stub transceivers
IEC 61315 - Calibration of fibre-optic power meters EN IEC 61315 -
IEC 61746-2 - Calibration of optical time-domain EN 61746-2 -
reflectometers (OTDR) - Part 2: OTDR for
multimode fibres
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SIST EN IEC 61280-4-1:2019
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SIST EN IEC 61280-4-1:2019
IEC 61280-4-1
Edition 3.0 2019-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre-optic communication subsystem test procedures –
Part 4-1: Installed cabling plant – Multimode attenuation measurement
Procédures d'essai des sous-systèmes de télécommunication fibroniques –
Partie 4-1: Installation câblée – Mesure de l'affaiblissement en multimodal
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.01 ISBN 978-2-8322-6893-3

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN IEC 61280-4-1:2019
– 2 – IEC 61280-4-1:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 7

1 Scope .............................................................................................................................. 9

2 Normative references ...................................................................................................... 9

3 Terms, definitions, graphical symbols and abbreviated terms........................................... 9

3.1 Terms and definitions ............................................................................................ 10

3.2 Graphical symbols ................................................................................................ 12

3.3 Abbreviated terms ................................................................................................. 14

4 Test methods ................................................................................................................. 14

4.1 General ................................................................................................................. 14

4.2 Cabling configurations and applicable test methods .............................................. 15

5 Overview of uncertainties .............................................................................................. 17

5.1 General ................................................................................................................. 17

5.2 Sources of significant uncertainties ....................................................................... 17

5.3 Consideration of the PM ........................................................................................ 18

5.4 Consideration of test cord connector grade ........................................................... 18

5.5 Typical uncertainty values ..................................................................................... 18

6 Apparatus ...................................................................................................................... 19

6.1 General ................................................................................................................. 19

6.2 Light source .......................................................................................................... 19

6.2.1 Stability ......................................................................................................... 19

6.2.2 Spectral characteristics (LSPM measurement) ............................................... 19

6.3 Launch cord .......................................................................................................... 20

6.4 Receive or tail cord ............................................................................................... 20

6.5 Substitution cord ................................................................................................... 21

6.6 Power meter – LSPM methods only....................................................................... 21

6.7 OTDR apparatus ................................................................................................... 21

6.8 Connector end face cleaning and inspection equipment ........................................ 22

6.9 Adapters ............................................................................................................... 22

7 Procedures .................................................................................................................... 22

7.1 General ................................................................................................................. 22

7.2 Common procedures ............................................................................................. 22

7.2.1 Care of the test cords .................................................................................... 22

7.2.2 Make reference measurements (LSPM methods only).................................... 22

7.2.3 Inspect and clean the ends of the optical fibres in the cabling ........................ 22

7.2.4 Make the measurements ................................................................................ 23

7.2.5 Make the calculations .................................................................................... 23

7.2.6 Duplex and bi-directional testing .................................................................... 23

7.3 Calibration ............................................................................................................ 23

7.4 Safety ................................................................................................................... 23

8 Calculations ................................................................................................................... 23

9 Documentation .............................................................................................................. 23

9.1 Information for each test ....................................................................................... 23

9.2 Information to be available .................................................................................... 24

Annex A (normative) One-cord method ................................................................................ 25

A.1 Applicability of test method ................................................................................... 25

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A.2 Apparatus ............................................................................................................. 25

A.3 Procedure ............................................................................................................. 25

A.4 Calculation ............................................................................................................ 26

A.5 Components of reported attenuation ..................................................................... 26

Annex B (normative) Three-cord method .............................................................................. 27

B.1 Applicability of test method ................................................................................... 27

B.2 Apparatus ............................................................................................................. 27

B.3 Procedure ............................................................................................................. 27

B.4 Calculations .......................................................................................................... 28

B.5 Components of reported attenuation ..................................................................... 28

Annex C (normative) Two-cord method ................................................................................ 29

C.1 Applicability of test method ................................................................................... 29

C.2 Apparatus ............................................................................................................. 29

C.3 Procedure ............................................................................................................. 29

C.4 Calculations .......................................................................................................... 30

C.5 Components of reported attenuation ..................................................................... 30

Annex D (normative) Equipment cord method ...................................................................... 32

D.1 Applicability of the test method ............................................................................. 32

D.2 Apparatus ............................................................................................................. 32

D.3 Procedure ............................................................................................................. 32

D.4 Calculation ............................................................................................................ 33

D.5 Components of reported attenuation ..................................................................... 33

D.6 Typical uncertainty values ..................................................................................... 34

Annex E (normative) Optical time domain reflectometer ....................................................... 35

E.1 Applicability of the test method ............................................................................. 35

E.2 Apparatus ............................................................................................................. 35

E.2.1 General ......................................................................................................... 35

E.2.2 OTDR ............................................................................................................ 35

E.2.3 Test cords ..................................................................................................... 35

E.3 Procedure (test method) ....................................................................................... 36

E.4 Calculation ............................................................................................................ 37

E.4.1 General ......................................................................................................... 37

E.4.2 Connection location ....................................................................................... 37

E.4.3 Definition of power levels F and F .............................................................. 38

1 2

E.4.4 Alternative calculation.................................................................................... 38

E.5 OTDR uncertainties .............................................................................................. 40

Annex F (normative) Requirements for the source characteristics ........................................ 42

F.1 Encircled flux ........................................................................................................ 42

F.2 Assumptions and limitations .................................................................................. 42

F.3 Encircled flux templates ........................................................................................ 42

F.3.1 General ......................................................................................................... 42

F.3.2 Uncertainties expectations ............................................................................. 43

F.3.3 Templates...................................................................................................... 43

F.4 Graphical representation of templates ................................................................... 44

Annex G (informative) OTDR configuration information ........................................................ 46

G.1 General ................................................................................................................. 46

G.2 Fundamental parameters that define the operational capability of an OTDR .......... 47

G.2.1 Dynamic range .............................................................................................. 47

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SIST EN IEC 61280-4-1:2019
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G.2.2 Pulse width .................................................................................................... 47

G.2.3 Averaging time .............................................................................................. 47

G.2.4 Dead zone ..................................................................................................... 47

G.3 Other parameters .................................................................................................. 47

G.3.1 Index of refraction .......................................................................................... 47

G.3.2 Measurement range ....................................................................................... 48

G.3.3 Distance sampling ......................................................................................... 48

G.4 Other measurement configurations ....................................................................... 48

G.4.1 General ......................................................................................................... 48

G.4.2 Macrobend or splice attenuation measurement .............................................. 48

G.4.3 Splice attenuation measurement .................................................................... 49

G.4.4 Measurement with high reflection connectors or short length cabling ............. 49

G.4.5 Ghost ............................................................................................................ 51

G.5 More on the measurement method ........................................................................ 52

G.6 Bi-directional measurement ................................................................................... 53

G.7 Non-recommended practices................................................................................. 54

G.7.1 Measurement without tail test cord ................................................................ 54

G.7.2 Cursor measurement ..................................................................................... 54

Annex H (informative) Test cord attenuation verification ...................................................... 55

H.1 General ................................................................................................................. 55

H.2 Apparatus ............................................................................................................. 55

H.3 Procedure ............................................................................................................. 55

H.3.1 General ......................................................................................................... 55

H.3.2 Test cord verification for the one-cord and two-cord methods when

using non-pinned/unpinned and non-plug/socket style connectors ................. 56

H.3.3 Test cord verification for the one-cord and two-cord methods when

using pinned/unpinned or plug/socket style connectors .................................. 57

H.3.4 Test cord verification for the three-cord method when using non-

pinned/unpinned and non-plug/socket style connectors ................................. 59

H.3.5 Test cord verification for the three-cord method when using

pinned/unpinned or plug/socket style connectors ........................................... 61

Annex I (normative) On the use of reference-grade test cords.............................................. 63

I.1 General ................................................................................................................. 63

I.2 Practical configurations and assumptions.............................................................. 63

I.2.1 Component specifications .............................................................................. 63

I.2.2 Conventions .................................................................................................. 64

I.2.3 Reference planes .......................................................................................... 64

I.3 Impact of using reference grade test cords for recommended LSPM methods ....... 64

I.4 Examples for LSPM measurements ....................................................................... 65

I.4.1 Example 1 (configuration A, 1-C method – Annex A) ...................................... 65

I.4.2 Example 2 (configuration D, EC method – Annex D) ...................................... 65

I.5 Impact of using reference-grade test cords for different configurations using

the OTDR test method .......................................................................................... 66

I.5.1 Cabling configurations A, B and C ................................................................. 66

I.5.2 Cabling configuration D ................................................................................. 67

Annex J (informative) Launch cord output near-field verification........................................... 69

J.1 Direct verification .................................................................................................. 69

J.2 Test equipment manufacturer verification .............................................................. 69

J.3 Field check with physical artefact .......................................................................... 69

J.3.1 General ......................................................................................................... 69

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J.3.2 Procedure for attenuation characterization of artefacts .................................. 71

J.3.3 Construction details ....................................................................................... 71

J.3.4 Example results ............................................................................................. 72

Bibliography .......................................................................................................................... 76

Figure 1 – Connector symbols .............................................................................................. 13

Figure 2 – Symbol for cabling under test ............................................................................... 13

Figure 3 – Reference plane for configuration A tested with the 1-cord method ...................... 16

Figure 4 – Reference plane for configuration B tested with the 3-cord method ...................... 16

Figure 5 – Reference plane for configuration C tested with the 2-cord method ...................... 17

Figure 6 – Reference plane for configuration D tested with the EC method ........................... 17

Figure 7 – OTDR schematic .................................................................................................. 21

Figure A.1 – Reference measurement ................................................................................... 26

Figure A.2 – Test measurement ............................................................................................ 26

Figure B.1 – Reference measurement ................................................................................... 27

Figure B.2 – Test measurement ............................................................................................ 28

Figure C.1 – Reference measurement ................................................................................... 29

Figure C.2 – Test measurement ............................................................................................ 30

Figure C.3 – Test measurement for plug-socket style connectors .......................................... 30

Figure D.1 – Reference measurement ................................................................................... 33

Figure D.2 – Test measurement ............................................................................................ 33

Figure E.1 – OTDR method ................................................................................................... 36

Figure E.2 – Location of the ports of the cabling under test ................................................... 37

Figure E.3 – Graphic construction of F and F .................................................................... 38

1 2

Figure E.4 – Graphic construction of F , F , F and F .................................................... 40

1 11 12 2

Figure F.1 – Encircled flux example ...................................................................................... 45

Figure G.1 – Splice and macrobend attenuation measurement .............................................. 49

Figure G.2 – Attenuation measurement with high reflection connectors ................................. 50

Figure G.3 – Attenuation measurement of a short length cabling........................................... 51

Figure G.4 – OTDR trace with ghost ..................................................................................... 52

Figure G.5 – Cursor positioning ............................................................................................ 53

Figure H.1 – Obtaining reference power level P .................................................................. 57

Figure H.2 – Obtaining power level P .................................................................................. 57

Figure H.3 – Obtaining reference power level P ................................................................

...

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