Fibre-optic communication subsystem test procedures - Part 4-1: Installed cabling plant - Multimode attenuation measurement

IEC 61280-4-1: 2019 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. This third edition cancels and replaces the second edition, published in 2009. This edition constitutes a technical revision. This edition includes 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.
Keywords: measurement of attenuation
The contents of the corrigendum of April 2020 have been included in this copy.

Procédures d’essai des sous-systèmes de télécommunication fibroniques - Partie 4-1: Installation câblée – Mesure de l’affaiblissement en multimodal

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
Le contenu du corrigendum d'avril 2020 a été pris en considération dans cet exemplaire.

General Information

Status
Published
Publication Date
21-May-2019
Current Stage
PPUB - Publication issued
Completion Date
22-May-2019
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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
IEC 61280-4-1:2019-05(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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
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COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.01 ISBN 978-2-8322-6893-3

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---------------------- Page: 3 ----------------------
– 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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IEC 61280-4-1:2019 © IEC 2019 – 3 –

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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– 4 – IEC 61280-4-1:2019 © IEC 2019

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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IEC 61280-4-1:2019 © IEC 2019 – 5 –

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 .................................................................. 58

Figure H.4 – Obtaining power level P .................................................................................. 58

Figure H.5 – Obtaining reference power level P .................................................................. 59

Figure H.6 – Obtaining power level ....................................................................................... 59

Figure H.7 – Obtaining reference power level P .................................................................. 60

Figure H.8 – Obtaining power level P .................................................................................. 60

Figure H.9 – Obtaining power level P .................................................................................. 61

Figure H.10 – Obtaining reference power level P ................................................................ 62

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– 6 – IEC 61280-4-1:2019 © IEC 2019

Figure H.11 – Obtaining power level P ................................................................................ 62

Figure I.1 – Cabling configurations A, B and C tested with the OTDR method ....................... 66

Figure I.2 – Cabling configuration D tested with the OTDR method ....................................... 68

Figure J.1 – Initial power measurement ................................................................................. 70

Figure J.2 – Verification of reference-grade connection ........................................................ 70

Figure J.3 – Two offset splices .............................................................................................. 70

Figure J.4 – Five offset splices ............................................................................................. 71

Figure J.5 – EF centred ........................................................................................................ 72

Figure J.6 – EF underfilling ................................................................................................... 73

Figure J.7 – EF overfilling ..................................................................................................... 73

Figure J.8 – L1 attenuation with mandrel............................................................................... 74

Figure J.9 – L1 attenuation with mandrel and mode conditioner ............................................ 74

Figure J.10 – L2 attenuation with mandrel ............................................................................. 74

Figure J.
...

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