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IEC 61280-4-5
Edition 1.0 2020-07
INTERNATIONAL
STANDARD
colour
inside
Fibre-optic communication subsystem test procedures –
Part 4-5: Installed cabling plant – Attenuation measurement of MPO terminated
fibre optic cabling plant using test equipment with MPO interfaces
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IEC 61280-4-5
Edition 1.0 2020-07
INTERNATIONAL
STANDARD
colour
inside
Fibre-optic communication subsystem test procedures –
Part 4-5: Installed cabling plant – Attenuation measurement of MPO terminated
fibre optic cabling plant using test equipment with MPO interfaces
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.01 ISBN 978-2-8322-8670-8
– 2 – IEC 61280-4-5:2020 © IEC 2020
CONTENTS
FOREWORD . 7
1 Scope . 9
2 Normative references . 9
3 Terms, definitions, graphical symbols and abbreviated terms. 10
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 . 16
5.1 General . 16
5.2 Sources of significant uncertainties . 16
5.3 Consideration of the PM . 17
5.4 Consideration of test cord connector grade . 17
5.5 Typical uncertainty values for multimode testing . 17
5.6 Typical uncertainty values for single-mode testing . 19
6 Apparatus . 20
6.1 General . 20
6.2 Light source . 20
6.2.1 General . 20
6.2.2 Stability . 20
6.2.3 Spectral characteristics (LSPM measurement) . 21
6.3 Launch cord . 21
6.4 Receive or tail cord . 22
6.5 Substitution cord . 22
6.6 Adapter cord . 23
6.7 Power meter – LSPM methods only. 23
6.8 OTDR apparatus . 24
6.9 Connector end face cleaning and inspection equipment . 24
6.10 Adapters . 24
7 Procedures . 24
7.1 General . 24
7.2 Common procedures . 25
7.2.1 Care of the test cords . 25
7.2.2 Take reference measurements. 25
7.2.3 Inspect and clean the ends of the optical fibres in the cabling . 25
7.2.4 Take the measurements . 25
7.2.5 Make the calculations . 25
7.2.6 Multi-fibre and bi-directional testing . 25
7.3 Calibration . 26
7.4 Safety . 26
8 Calculations . 26
9 Documentation . 26
9.1 Information for each test . 26
9.2 Information to be available . 26
Annex A (normative) One-cord method . 27
A.1 Applicability of the test method . 27
A.2 Apparatus . 27
A.3 Procedure for unpinned to unpinned cabling with unpinned power meter . 27
A.4 Procedure for unpinned to pinned cabling with unpinned power meter . 28
A.5 Procedure for pinned to pinned cabling with pinned power meter . 29
A.6 Procedure for unpinned to unpinned cabling with pinned power meter and
gender-neutral test cord . 30
A.7 Calculation . 31
A.8 Components of reported attenuation . 31
Annex B (normative) Three-cord method . 32
B.1 Applicability of the test method . 32
B.2 Apparatus . 32
B.3 Procedure for unpinned to unpinned cabling . 32
B.4 Procedure for unpinned to pinned cabling . 33
B.5 Procedure for pinned to pinned cabling . 34
B.6 Procedure, channel test (general) . 35
B.7 Calculations . 36
B.8 Components of reported attenuation . 36
Annex C (normative) Adapter-cord method . 37
C.1 Applicability of the test method . 37
C.2 Apparatus . 37
C.3 Procedure for unpinned to unpinned cabling with pinned power meter . 37
C.4 Procedure for unpinned to pinned cabling with pinned power meter . 38
C.5 Procedure for pinned to unpinned cabling with unpinned power meter . 39
C.6 Procedure for pinned to pinned cabling with unpinned power meter . 40
C.7 Calculations . 41
C.8 Components of reported attenuation . 42
Annex D (normative) Equipment cord method . 43
D.1 Applicability of the test method . 43
D.2 Apparatus . 43
D.3 Procedure . 43
D.4 Calculation . 44
D.5 Components of reported attenuation . 44
D.6 Typical uncertainty values . 45
Annex E (normative) Optical time domain reflectometer . 46
E.1 Applicability of the test method . 46
E.2 Apparatus . 46
E.2.1 General . 46
E.2.2 OTDR . 46
E.2.3 Test cords . 47
E.3 Procedure (test method) . 47
E.4 Calculation . 48
E.4.1 General . 48
E.4.2 Connection location . 48
E.4.3 Definition of the power levels F and F . 49
1 2
E.4.4 Alternative calculation. 50
E.5 OTDR uncertainties . 52
– 4 – IEC 61280-4-5:2020 © IEC
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