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eLibrary > BS EN IEC 61280-4-2:2024 Fibre-optic communication subsystem test procedures - Installed cabling plant. Single-mode attenuation and optical return loss measurements >

BS EN IEC 61280-4-2:2024 Fibre-optic communication subsystem test procedures - Installed cabling plant. Single-mode attenuation and optical return loss measurements, 2024

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BS EN IEC 61280-4-2:2024 Fibre-optic communication subsystem test procedures - Installed cabling plant. Single-mode attenuation and optical return loss measurements, 2024

undefined [Go to Page]
Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
English [Go to Page]
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions, graphical symbols and abbreviated terms [Go to Page]
3.1 Terms and definitions
3.2 Graphical symbols
Figures [Go to Page]
Figure 1 – Connector symbols
3.3 Abbreviated terms
4 Measurement methods [Go to Page]
4.1 General [Go to Page]
4.1.1 Document structure
Figure 2 – Symbol for cabling under test [Go to Page]
4.1.2 Attenuation
4.1.3 Optical return loss
4.2 Cabling configurations and applicable test methods [Go to Page]
4.2.1 Cabling configurations and applicable test methods for attenuation measurements
Tables [Go to Page]
Table 1 – Cabling configurations
Figure 3 – Configuration A – Start and end of measured attenuations in RTM
Figure 4 – Configuration B – Start and end of measured attenuations in RTM
Figure 5 – Configuration C – Start and end of measured attenuations in RTM
Figure 6 – Configuration D – Start and end of measured attenuations in RTM
Table 2 – Test methods and configurations [Go to Page]
4.2.2 Cabling configurations and applicable test methods for optical return loss measurements
5 Overview of uncertainties for attenuation measurements [Go to Page]
5.1 General
5.2 Sources of significant uncertainties
5.3 Consideration of the power meter
5.4 Consideration of test cord and connector grade [Go to Page]
5.4.1 General
5.4.2 Mode field diameter variation
5.5 Reflections from other interfaces
Table 3 – Test limit adjustment and uncertainty related to test cord connector grade
5.6 Optical source
5.7 Output power reference
5.8 Bi-directional measurements
5.9 Typical uncertainties for attenuation methods A, B, C, and D
Table 4 – Uncertainty for given fibre length and attenuation at 1 310 nm, 1 550 nm and 1 625 nm
5.10 Typical uncertainty values for single-mode attenuation testing for method E
6 Apparatus [Go to Page]
6.1 General
6.2 Light source [Go to Page]
6.2.1 Stability
Table 5 – Uncertainty for a given fibre length at 1 310 nm and 1 550 nm using an OTDR [Go to Page]
6.2.2 Spectral characteristics
Table 6 – Spectral requirements
6.3 Launch cord
6.4 Receive or tail cords
6.5 Substitution cord
6.6 Power meter – LSPM methods only
6.7 OTDR apparatus
6.8 Return loss test set
Figure 7 – Typical OTDR schematic diagram
6.9 Connector end-face cleaning and inspection equipment
6.10 Adapters
Figure 8 – Illustration of return loss test set
7 Procedures [Go to Page]
7.1 General
7.2 Common procedures [Go to Page]
7.2.1 Care of the test cords
7.2.2 Make reference measurements (LSPM and OCWR methods only)
7.2.3 Inspect and clean the ends of the fibres in the cabling
7.2.4 Make the measurements
7.2.5 Make the calculations
7.3 Calibration
7.4 Safety
8 Calculations
9 Documentation [Go to Page]
9.1 Information for each test
9.2 Information to be made available
Annexes [Go to Page]
Annex A (normative) One-cord reference method [Go to Page]
A.1 Applicability of test method
A.2 Apparatus
A.3 Procedure
A.4 Calculation
Figure A.1 – One-cord reference measurement
Figure A.2 – One-cord test measurement [Go to Page]
A.5 Components of reported attenuation
Annex B (normative) Three-cord reference method [Go to Page]
B.1 Applicability of test method
B.2 Apparatus
B.3 Procedure
Figure B.1 – Three-cord reference measurement [Go to Page]
B.4 Calculations
B.5 Components of reported attenuation
Figure B.2 – Three-cord test measurement
Annex C (normative) Two-cord reference method [Go to Page]
C.1 Applicability of test method
C.2 Apparatus
C.3 Procedure
Figure C.1 – Two-cord reference measurement
Figure C.2 – Two-cord test measurement
Figure C.3 – Two-cord test measurement for plug-to-socket style connectors [Go to Page]
C.4 Calculations
C.5 Components of reported attenuation
Annex D (normative) Equipment cord method [Go to Page]
D.1 Applicability of the test method
D.2 Apparatus
D.3 Procedure
D.4 Calculation
Figure D.1 – Reference measurement
Figure D.2 – Test measurement [Go to Page]
D.5 Components of reported attenuation
Annex E (normative) Optical time domain reflectometer [Go to Page]
E.1 Applicability of test method
E.2 Apparatus [Go to Page]
E.2.1 General
E.2.2 OTDR
E.2.3 Test cords
E.3 Procedure (test method)
Table E.1 – Typical launch and tail cord lengths [Go to Page]
E.4 Calculation of attenuation [Go to Page]
E.4.1 General
E.4.2 Connection location
Figure E.1 – Test measurement for OTDR method [Go to Page]
[Go to Page]
E.4.3 Definition of the power levels F1 and F2
Figure E.2 – Location of the cabling under test ports [Go to Page]
[Go to Page]
E.4.4 Alternative calculation
Figure E.3 – Graphic construction of F1 and F2 [Go to Page]
E.5 Calculation of optical return loss
Figure E.4 – Graphic construction of F1, F11, F21 and F2 [Go to Page]
E.6 Calculation of reflectance for discrete components
Figure E.5 – Graphic representation of OTDR ORL measurement
Figure E.6 – Graphic representation of reflectance measurement [Go to Page]
E.7 OTDR uncertainties
Annex F (normative) Continuous wave optical return loss measurement – Method A [Go to Page]
F.1 Applicability of test method
F.2 Apparatus [Go to Page]
F.2.1 General
F.2.2 Light source
F.2.3 Branching device or coupler
Figure F.1 – Return loss test set illustration [Go to Page]
[Go to Page]
F.2.4 Power meters
F.2.5 Connector interface
F.2.6 Low reflection termination
F.3 Procedure [Go to Page]
F.3.1 Test set characterization
Figure F.2 – Measurement of the system internal attenuation Pref2
Figure F.3 – Measurement of the system internal attenuation Pref1
Figure F.4 – Measurement of the system reflected power Prs [Go to Page]
[Go to Page]
F.3.2 Measurement procedure
F.3.3 Calculations
Figure F.5 – Measurement of the input power Pin
Figure F.6 – Measurement of the reflected power Pr
Annex G (normative) Continuous wave optical return loss measurement – Method B [Go to Page]
G.1 Applicability of test method
G.2 Apparatus [Go to Page]
G.2.1 General requirements
G.2.2 Known reflectance termination
Figure G.1 – Return loss test set illustration [Go to Page]
G.3 Procedure [Go to Page]
G.3.1 Set-up characterization
G.3.2 Measurement procedure
Figure G.2 – Measurement of Prs with reflections suppressed
Figure G.3 – Measurement of Pref with reference reflector [Go to Page]
[Go to Page]
G.3.3 Calculation
Figure G.4 – Measurement of the system reflected power Prs
Figure G.5 – Measurement of the reflected power Pr
Annex H (normative) On the use of reference-grade test cords [Go to Page]
H.1 General
H.2 Practical configurations and assumptions [Go to Page]
H.2.1 Component specifications
H.2.2 Conventions
H.2.3 Reference planes
Table H.1 – Expected attenuation for examples [Go to Page]
H.3 Impact of using reference-grade test cords for recommended LSPM methods
H.4 Examples for LSPM measurements [Go to Page]
H.4.1 Example 1 (configuration A, one-cord method, Annex A)
Table H.2 – Test limit adjustment when using reference-grade test cords [Go to Page]
[Go to Page]
H.4.2 Example 2 (configuration B, three-cord method, Annex B)
H.4.3 Example 3 (configuration C, two-cord method, Annex C)
H.4.4 Example 4 – Long haul system (one-cord reference method)
H.5 Impact of using reference-grade test cords for different configurations using the OTDR test method [Go to Page]
H.5.1 Cabling configurations A, B and C
Figure H.1 – Cabling configurations A, B and C tested with the OTDR method [Go to Page]
[Go to Page]
H.5.2 Cabling configuration D
Table H.3 – Test limit adjustment when using reference-grade test cords –OTDR test method
Figure H.2 – Cabling configuration D tested with the OTDR method
Annex I (informative) OTDR configuration information [Go to Page]
I.1 Introductory remarks
I.2 Fundamental parameters that define the operational capability of an OTDR [Go to Page]
I.2.1 Dynamic range
I.2.2 Dynamic margin
I.2.3 Pulse width
I.2.4 Averaging time
I.2.5 Dead zone
I.3 Other parameters [Go to Page]
I.3.1 Index of refraction
I.3.2 Measurement range
I.3.3 Distance sampling
I.4 Other measurement configurations [Go to Page]
I.4.1 General
I.4.2 Macrobend attenuation measurement
Table I.1 – Example of effective group index of refraction values [Go to Page]
[Go to Page]
I.4.3 Splice attenuation measurement
I.4.4 Measurement with high reflection connectors or short length cabling
Figure I.1 – Splice and macrobend attenuation measurement
Figure I.2 – Attenuation measurement with high reflection connectors [Go to Page]
[Go to Page]
I.4.5 Ghost
Figure I.3 – Attenuation measurement of a short length cabling [Go to Page]
I.5 More on the measurement method
Figure I.4 – OTDR trace with ghost [Go to Page]
I.6 Bi-directional measurement
Figure I.5 – Cursor positioning [Go to Page]
I.7 OTDR bi-directional trace analysis
Figure I.6 – Bi-directional OTDR trace display [Go to Page]
I.8 Non-recommended practices [Go to Page]
I.8.1 Measurement without tail cord
I.8.2 Two cursors measurement
Figure I.7 – Bi-directional OTDR trace attenuation analysis
Annex J (informative) Test cord attenuation verification [Go to Page]
J.1 Introductory remarks
J.2 Apparatus
J.3 Procedure [Go to Page]
J.3.1 General
J.3.2 Test cord verification for the one-cord and two-cord reference test methods when using non-pinned or unpinned and non-plug or socket style connectors
J.3.3 Test cord verification for the one-cord and two-cord reference test methods using pinned-to-unpinned or plug-to-socket style connectors
Figure J.1 – Obtaining reference power level P0
Figure J.2 – Obtaining power level P1
Figure J.3 – Obtaining reference power level P0
Figure J.4 – Obtaining power level P1 [Go to Page]
[Go to Page]
J.3.4 Test cord verification for the three-cord reference test method using non-pinned or unpinned and non-plug or socket style connectors
Figure J.5 – Obtaining reference power level P0
Figure J.6 – Obtaining power level P1
Figure J.7 – Obtaining reference power level P0 [Go to Page]
[Go to Page]
J.3.5 Test cord verification for the three-cord reference test method using pinned-to-unpinned or plug-to-socket style connectors
Figure J.8 – Obtaining power level P1
Figure J.9 – Obtaining power level P6
Figure J.10 – Obtaining reference power level P0
Figure J.11 – Obtaining power level P1
Annex K (informative) Spectral attenuation measurement [Go to Page]
K.1 Applicability of test method
K.2 Apparatus [Go to Page]
K.2.1 Broadband light source
K.2.2 Optical spectrum analyser
K.3 Procedure [Go to Page]
K.3.1 Reference scan
K.3.2 Measurement scan
K.4 Calculations
Figure K.1 – Result of spectral attenuation measurement
Bibliography [Go to Page]

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BS EN IEC 61280-4-2:2024 Fibre-optic communication subsystem test procedures - Installed cabling plant. Single-mode attenuation and optical return loss measurements, 2024

⨯To continue with accurate pricing,
please select your company type below: