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 ?m) and A1-OM1 (62,5/125 ?m) 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

PDF Catalog

PDF Pages	PDF Title
2	National foreword
5	Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
7	English CONTENTS
12	FOREWORD
14	1 Scope 2 Normative references 3 Terms, definitions, graphical symbols and abbreviated terms
15	3.1 Terms and definitions
17	3.2 Graphical symbols
18	Figures Figure 1 – Connector symbols Figure 2 – Symbol for cabling under test
19	3.3 Abbreviated terms 4 Test methods 4.1 General
20	4.2 Cabling configurations and applicable test methods Tables Table 1 – Cabling configurations Table 2 – Test methods and configurations
21	Figure 3 – Reference plane for configuration A tested with the 1-cord method Figure 4 – Reference plane for configuration B tested with the 3-cord method
22	5 Overview of uncertainties 5.1 General 5.2 Sources of significant uncertainties Figure 5 – Reference plane for configuration C tested with the 2-cord method Figure 6 – Reference plane for configuration D tested with the EC method
23	5.3 Consideration of the PM 5.4 Consideration of test cord connector grade 5.5 Typical uncertainty values Table 3 – Measurements bias related to test cord connector grade
24	6 Apparatus 6.1 General 6.2 Light source 6.2.1 Stability 6.2.2 Spectral characteristics (LSPM measurement) Table 4 – Uncertainty for a given attenuation at 850 nm Table 5 – Spectral requirements
25	6.3 Launch cord 6.4 Receive or tail cord
26	6.5 Substitution cord 6.6 Power meter – LSPM methods only 6.7 OTDR apparatus Figure 7 – OTDR schematic
27	6.8 Connector end face cleaning and inspection equipment 6.9 Adapters 7 Procedures 7.1 General 7.2 Common procedures 7.2.1 Care of the test cords 7.2.2 Make reference measurements (LSPM methods only) 7.2.3 Inspect and clean the ends of the optical fibres in the cabling
28	7.2.4 Make the measurements 7.2.5 Make the calculations 7.2.6 Duplex and bi-directional testing 7.3 Calibration 7.4 Safety 8 Calculations 9 Documentation 9.1 Information for each test
29	9.2 Information to be available
30	Annexes Annex A (normative) One-cord method A.1 Applicability of test method A.2 Apparatus A.3 Procedure
31	A.4 Calculation A.5 Components of reported attenuation Figure A.1 – Reference measurement Figure A.2 – Test measurement
32	Annex B (normative) Three-cord method B.1 Applicability of test method B.2 Apparatus B.3 Procedure Figure B.1 – Reference measurement
33	B.4 Calculations B.5 Components of reported attenuation Figure B.2 – Test measurement
34	Annex C (normative) Two-cord method C.1 Applicability of test method C.2 Apparatus C.3 Procedure Figure C.1 – Reference measurement
35	C.4 Calculations C.5 Components of reported attenuation Figure C.2 – Test measurement Figure C.3 – Test measurement for plug-socket style connectors
37	Annex D (normative) Equipment cord method D.1 Applicability of the test method D.2 Apparatus D.3 Procedure
38	D.4 Calculation D.5 Components of reported attenuation Figure D.1 – Reference measurement Figure D.2 – Test measurement
39	D.6 Typical uncertainty values Table D.1 – Uncertainty for a given attenuation at 850 nm
40	Annex E (normative) Optical time domain reflectometer E.1 Applicability of the test method E.2 Apparatus E.2.1 General E.2.2 OTDR E.2.3 Test cords
41	E.3 Procedure (test method) Figure E.1 – OTDR method
42	E.4 Calculation E.4.1 General E.4.2 Connection location Figure E.2 – Location of the ports of the cabling under test
43	E.4.3 Definition of power levels F1 and F2 E.4.4 Alternative calculation Figure E.3 – Graphic construction of F1 and F2
45	E.5 OTDR uncertainties Figure E.4 – Graphic construction of F1, F11, F12 and F2
47	Annex F (normative) Requirements for the source characteristics F.1 Encircled flux F.2 Assumptions and limitations F.3 Encircled flux templates F.3.1 General
48	F.3.2 Uncertainties expectations F.3.3 Templates Table F.1 – Attenuation, threshold tolerance and confidence level Table F.2 – EF requirements for 50 µm core optical fibre cabling at 850 nm
49	F.4 Graphical representation of templates Table F.3 – EF requirements for 50 μm core optical fibre cabling at 1 300 nm Table F.4 – EF requirements for 62,5 μm core optical fibre cabling at 850 nm Table F.5 – EF requirements for 62,5 μm core optical fibre cabling at 1 300 nm
50	Figure F.1 – Encircled flux example
51	Annex G (informative) OTDR configuration information G.1 General
52	G.2 Fundamental parameters that define the operational capability of an OTDR G.2.1 Dynamic range G.2.2 Pulse width G.2.3 Averaging time G.2.4 Dead zone G.3 Other parameters G.3.1 Index of refraction
53	G.3.2 Measurement range G.3.3 Distance sampling G.4 Other measurement configurations G.4.1 General G.4.2 Macrobend or splice attenuation measurement Table G.1 – Default effective group index of refraction values
54	G.4.3 Splice attenuation measurement G.4.4 Measurement with high reflection connectors or short length cabling Figure G.1 – Splice and macrobend attenuation measurement
55	Figure G.2 – Attenuation measurement with high reflection connectors
56	G.4.5 Ghost Figure G.3 – Attenuation measurement of a short length cabling
57	G.5 More on the measurement method Figure G.4 – OTDR trace with ghost
58	G.6 Bi-directional measurement Figure G.5 – Cursor positioning
59	G.7 Non-recommended practices G.7.1 Measurement without tail test cord G.7.2 Cursor measurement
60	Annex H (informative) Test cord attenuation verification H.1 General H.2 Apparatus H.3 Procedure H.3.1 General
61	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
62	H.3.3 Test cord verification for the one-cord and two-cord methods when using pinned/unpinned or plug/socket style connectors Figure H.1 – Obtaining reference power level P0 Figure H.2 – Obtaining power level P1
63	Figure H.3 – Obtaining reference power level P0 Figure H.4 – Obtaining power level P1
64	H.3.4 Test cord verification for the three-cord method when using non-pinned/unpinned and non-plug/socket style connectors Figure H.5 – Obtaining reference power level P0 Figure H.6 – Obtaining power level
65	Figure H.7 – Obtaining reference power level P0 Figure H.8 – Obtaining power level P1
66	H.3.5 Test cord verification for the three-cord method when using pinned/unpinned or plug/socket style connectors Figure H.9 – Obtaining power level P5
67	Figure H.10 – Obtaining reference power level P0 Figure H.11 – Obtaining power level P1
68	Annex I (normative) On the use of reference-grade test cords I.1 General I.2 Practical configurations and assumptions I.2.1 Component specifications
69	I.2.2 Conventions I.2.3 Reference planes I.3 Impact of using reference grade test cords for recommended LSPM methods
70	I.4 Examples for LSPM measurements I.4.1 Example 1 (configuration A, 1-C method – Annex A) I.4.2 Example 2 (configuration D, EC method – Annex D) Table I.1 – Measurement bias when using reference-grade test cords
71	I.5 Impact of using reference-grade test cords for different configurations using the OTDR test method I.5.1 Cabling configurations A, B and C Figure I.1 – Cabling configurations A, B and C tested with the OTDR method
72	I.5.2 Cabling configuration D Table I.2 – Measurement bias when using reference grade test cords – OTDR test method
73	Figure I.2 – Cabling configuration D tested with the OTDR method
74	Annex J (informative) Launch cord output near-field verification J.1 Direct verification J.2 Test equipment manufacturer verification J.3 Field check with physical artefact J.3.1 General
75	Figure J.1 – Initial power measurement Figure J.2 – Verification of reference-grade connection Figure J.3 – Two offset splices
76	J.3.2 Procedure for attenuation characterization of artefacts J.3.3 Construction details Figure J.4 – Five offset splices
77	J.3.4 Example results Figure J.5 – EF centred
78	Figure J.6 – EF underfilling Figure J.7 – EF overfilling
79	Figure J.8 – L1 attenuation with mandrel Figure J.9 – L1 attenuation with mandrel and mode conditioner Figure J.10 – L2 attenuation with mandrel
80	Figure J.11 – L2 attenuation with mandrel and mode conditioning Figure J.12 – L3 attenuation with mandrel Figure J.13 – L3 attenuation with mandrel and mode conditioning
81	Bibliography

Published By	Publication Date	Number of Pages
BSI	2019	84


PDF Format	Searchable	Printable	Preview Now

Status	Withdrawn
Title	Fibre-optic communication subsystem test procedures – Installed cabling plant. Multimode attenuation measurement
Replaces	BS EN 61280-4-1:2009
Publisher	BSI
Committee	GEL/86/3
Pages	84
Publication Date	2019-08-08
Withdrawn Date	2020-05-28
ISBN	978 0 580 90875 0
Standard Number	BS EN IEC 61280-4-1:2019
Identical National Standard Of	IEC 61280-4-1, EN IEC 61280-4-1:2019, EN 60335-2-54:2008
Descriptors	Optoelectronic devices, Optical communication systems, Telecommunication, Fibre optic cables, Fibre optic connectors, Optical fibres, Fibre optics, Performance testing, Attenuation
ICS Codes	33.180.01 - Fibre optic systems in general

BS EN IEC 61280-4-1:2019

PDF Catalog

Related products

BS EN IEC 61280-4-1:2019 – TC:2020 Edition

BS EN IEC 61280-4-1:2019+A1:2022

BS EN IEC 61280-4-1:2019+A1:2022:2023 Edition

UNE-EN IEC 61280-4-1:2019