BSI PD IEC TR 62959:2021
$215.11
Optical fibre cables. Shrinkage effects on cable and cable element end termination. Guidance
| Published By | Publication Date | Number of Pages |
| BSI | 2021 | 78 |
This document, which is a Technical Report, provides information on cable shrinkage characterisation of optical fibre cables that consist of standard glass optical fibres for telecommunication application. The characterisation is directed to the effects of cable shrinkage or cable element shrinkage on the termination of cables. Shrinkage can or cannot be a concern depending on the method of termination. Examples of different cable termination cases are included and described. Tests for the evaluation of cable shrinkage are recommended that can be used as indicators, and shrinkage classification by several grades are given.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 4 | CONTENTS |
| 9 | FOREWORD |
| 11 | INTRODUCTION |
| 12 | 1 Scope 2 Normative references 3 Terms and definitions |
| 13 | 4 Abbreviated terms 5 Characteristics of optical fibre cables 5.1 General 5.2 Cable materials 5.2.1 Plastic materials 5.2.2 Reversible thermal expansion and contraction |
| 14 | 5.2.3 Irreversible thermal contraction (shrinkage) Tables Table 1 – Linear coefficients of thermal expansion of materials (informative) |
| 15 | 5.2.4 Forces between cable elements caused by thermal changes 5.3 Cable design Figures Figure 1 – Qualitative example of force duringdecreasing temperature of two polymer materials |
| 16 | 5.4 Basic cable types |
| 17 | 5.5 Cable performance 5.5.1 General 5.5.2 Optical performance during temperature changes Table 2 – Typical characteristics of indoor and outdoor cables |
| 18 | 5.5.3 Cable shrinkage characteristic 5.5.4 Cable shrinkage during connector termination process |
| 19 | 6 Test methods for cable shrinkage 6.1 General 6.2 Conditions before shrinkage testing 6.3 Test method F11 |
| 20 | 6.4 Test method F17 Figure 2 – Cable sample for shrinkage testing according to Method F11 |
| 21 | 7 Conclusions of the cable shrinkage study 7.1 General 7.2 Conclusion for simplex cables Figure 3 – Cable sample for fibre protrusion testing according to Method F17 |
| 22 | 7.3 Conclusion for loose tube cables 8 Termination cases of optical fibre cables 8.1 General 8.2 Different termination cases |
| 23 | 9 Recommended tests for evaluation of shrinkage effects 9.1 General Table 3 – Overview of different termination cases |
| 24 | 9.2 Limitation of tests for determination of shrinkage effects 9.3 Cables terminated with connectors 9.3.1 Performance indicator tests 9.3.2 Cable shrinkage 9.3.3 Cable thermal expansion and contraction 9.3.4 Cable element forces 9.4 Cables terminated with hardened connectors 9.4.1 Performance indicator tests |
| 25 | 9.4.2 Cable shrinkage (fibre protrusion) 9.5 Cables fixed into a module and fibres terminated with connectors 9.5.1 Performance indicator tests 9.5.2 Cable shrinkage (fibre protrusion) 9.6 Cables fixed into a divider and fan-out cables terminated with connectors 9.6.1 Performance indicator tests |
| 26 | 9.6.2 General 9.6.3 Shrinkage (fibre protrusion) 9.6.4 Shrinkage of fan-out cable |
| 27 | 9.7 Cables fixed into a protective housing and terminated with splices 9.7.1 Performance indicator tests 9.7.2 Cable shrinkage (fibre protrusion) 9.7.3 Sheath shrinkage 9.8 Cables fixed into a protective housing and terminated with connectors 9.8.1 Performance indicator tests 9.8.2 Cable shrinkage |
| 28 | 10 Recommended test parameters for shrinkage testing and shrinkage grades 10.1 General 10.2 Recommended test parameters for shrinkage testing |
| 29 | 10.3 Shrinkage grades for Method F11A 10.4 Recommended shrinkage limit for Method F11B 10.5 Fibre protrusion grades for Method F17 Table 4 – Temperature cycling severitiesfor shrinkage testing for Methods F11A and F17 Table 5 – Recommended sheath shrinkage grades |
| 30 | Table 6 – Recommended change of fibre protrusion ∆L1 grades Table 7 – Recommended change of fibre protrusion ∆L2 grades |
| 31 | Annexes Annex A (informative)Test results of the cable shrinkage study A.1 General A.2 Shrinkage test results of simplex cables A.2.1 Simplex cable types for shrinkage tests A.2.2 Shrinkage test with different aging methods and duration |
| 33 | Figure A.1 – Sheath shrinkage in mm of cable type 1 with different temperatures |
| 34 | Figure A.2 – Sheath shrinkage in mm of cable type 2 with different temperatures |
| 35 | A.2.3 Shrinkage test with various numbers of temperature cycles Figure A.3 – Sheath shrinkage in mm of cable type 3 with different temperatures |
| 36 | A.2.4 Shrinkage test with different sample lengths A.2.5 Shrinkage test versus optical performance of two different simplex cables Figure A.4 – Sheath shrinkage at different number of cycles Table A.1 – Overview of shrinkage results |
| 37 | Figure A.5 – Change in attenuation during temperature cycling Table A.2 – Overview of simplex results |
| 38 | A.2.6 Shrinkage test versus optical performance of different versions of a simplex cable A.2.7 Change in length during and after climatic exposure Figure A.6 – Change in attenuation versus sheath shrinkage |
| 39 | A.3 Shrinkage test results for loose tube cables A.3.1 Loose tube cable types for shrinkage tests A.3.2 Shrinkage test (method F11 modified) of four loose tube cable types Table A.3 – Details of loose tube cable types |
| 40 | Figure A.7 – Preparation of sample and measured lengths |
| 41 | A.3.3 Shrinkage test (method F17) of four loose tube cable types Figure A.8 – Shrinkage of sheath and loose tube after different number of cycles |
| 42 | Figure A.9 – Preparation of sample and measured or calculated protrusion lengths |
| 43 | Figure A.10 – Protrusion length of cable type 1 Figure A.11 – Protrusion length of cable type 2 |
| 44 | Figure A.12 – Protrusion length of cable type 3 Figure A.13 – Protrusion length of cable type 4 |
| 45 | A.3.4 Shrinkage test of nine unitube cable types Table A.4 – Details of unitube cable types |
| 46 | Figure A.14 – Change of fibre protrusion |
| 47 | Annex B (informative)Test method for change in length during climatic exposure B.1 General B.2 Cable samples B.3 Apparatus for determination of the change in length Figure B.1 – Apparatus for holding cable samples |
| 48 | B.4 Procedure for determination of the change in length B.5 Test results for the change in length Figure B.2 – Temperature cycle with measurement points |
| 49 | B.6 Procedure for determination of the change in attenuation B.7 Test results for the change in attenuation Figure B.3 – Cable sheath length measurement results |
| 50 | Figure B.4 – Change in attenuation of orange cable samples at 1 310 nm Figure B.5 – Change in attenuation of orange cable samples at 1 550 nm |
| 51 | Figure B.6 – Change in attenuation of orange cable samples at 1 625 nm Figure B.7 – Change in attenuation of yellow cable samples at 1 310 nm |
| 52 | B.8 Comparison of change in length with change in attenuation Figure B.8 – Change in attenuation of yellow cable samples at 1 550 nm Figure B.9 – Change in attenuation of yellow cable samples at 1 625 nm |
| 53 | B.9 Conclusion Table B.1 – Comparison of change in length with change in attenuation |
| 54 | Annex C (informative)Shrinkage testing template Table C.1 – Shrinkage testing template |
| 55 | Annex D (informative) Recommended tests for performance evaluation of cables to be terminated with connectors D.1 General D.2 Connector types and design Figure D.1 – Cable terminated with connector plug Figure D.2 – LC connector variants |
| 56 | Figure D.3 – Simplex cable terminated at LC simplex connector |
| 57 | D.3 Simplex and duplex cable types Figure D.4 – Fibre movement in spring-loaded connectors Figure D.5 – Simplex cable type |
| 58 | D.4 Termination of a cable to a connector Figure D.6 – Duplex cable types |
| 59 | D.5 Overview of recommended cable tests D.6 Main performance of a terminated cable Table D.1 – Recommended tests for cables to be terminated with connectors |
| 60 | D.7 Guidance for change of temperature test methods Figure D.7 – Test arrangement for method F12 |
| 61 | Annex E (informative)Recommended tests for performance evaluation of cables to be terminated with hardened connectors E.1 General E.2 Connector types and design E.3 Cable types for hardened connectors E.4 Termination of a cable to a hardened connector Figure E.1 – Cable terminated with hardened connector |
| 62 | E.5 Overview of recommended cable tests E.6 Environmental performance of a terminated cable Table E.1 – Recommended tests for cables to be terminated with hardened connectors |
| 63 | Annex F (informative)Recommended tests for performance evaluation of cablesfixed into a module and fibres terminated with connectors F.1 General F.2 Connector types and design F.3 Cable types F.4 Termination of a cable to a module Figure F.1 – Cable fixed into a module and terminated with connectors |
| 64 | F.5 Overview of recommended cable tests F.6 Main performance of a terminated cable Table F.1 – Recommended tests for cables fixed into module and terminated with connectors |
| 65 | Annex G (informative)Recommended tests for performance evaluation of cables fixedinto a divider and fan-out cables terminated with connectors G.1 General G.2 Connector types and design G.3 Cable types G.3.1 Cables G.3.2 Fan-out cables Figure G.1 – Cable fixed into a divider and fan-outcables terminated with connectors |
| 66 | G.4 Termination of a cable into a divider and at fan-out cables G.5 Overview of recommended cable tests G.5.1 Recommended test for cable assembly G.5.2 Recommended tests for cables Table G.1 – Recommended tests for cable assembly Table G.2 – Recommended tests for cables fixed into dividers |
| 67 | G.5.3 Recommended tests for fan-out cables Table G.3 – Recommended tests for fan-out cables |
| 68 | Annex H (informative)Recommended tests for performance evaluation of cables fixedinto a protective housing and terminated with splices H.1 General H.2 Types of protective housings Figure H.1 – Cable fixed into a protective housing and terminated with splices |
| 69 | H.3 Cable types H.4 Termination of a cable in a protective housing H.5 Overview of recommended cable tests Table H.1 – Recommended tests for cables fixed at protective housing and terminated with splices |
| 70 | H.6 Main performance of a terminated cable |
| 71 | Annex I (informative)Recommended tests for performance evaluation of cables fixedinto a protective housing and terminated with connectors I.1 General I.2 Types of protective housings I.3 Cable types I.4 Termination of a cable into a protective housing Figure I.1 – Cable fixed into a protective housing and terminated with connectors |
| 72 | I.5 Overview of recommended cable tests I.6 Main performance of a terminated cable Table I.1 – Recommended tests for cables fixed into a protective housing and terminated with connectors |
| 73 | Annex J (informative)Recommended test parameters for change of temperature testing J.1 Test methods and severities Table J.1 – Severities for change of temperature testing |
| 74 | J.2 Additional recommendations for the change of temperature test Figure J.1 – Change of temperature test configuration |
| 75 | Annex K (informative)Cross-references of cable test methods Table K.1 – Cross reference table of mechanical test methods Table K.2 – Cross reference table of environmental test methods |
| 76 | Bibliography |
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