1、 TIA STANDARD FOTP-85 Fiber Optic Cable Twist Test TIA-455-85-A May 1992 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Representing the telecommunications industry in association with the Electronic Industries Alliance ANSI/TIA/EIA-455-85-A-1992Approved: May 26, 1992Reaffirmed: May 11, 1999Reaffirmed: May
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7、ndards Proposal No. 3-4445-RF1, formulated under the cognizance of the TIA FO-4.2 Subcommittee on Optical Fibers and Cables).Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 U.S.A. PRICE: Please refer to current Catalo
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21、tion or networking permitted without license from IHS-,-,-Section 1. 2. 3. 4. 5. 6. 7. 8. APPENDIX Figure 1 Figure 2 Figure 3 Table 1 Table 2 EIA TIA-455-85A 92 3234600 OS02530 227 TI-85A E“P-85 FIBER OPTIC CABLE TWIST TEST TABLE OF CONTENTS INTRODUCTION APPLICABLE DOCUMENTS APPARATUS SAMPLING AND S
22、PECIMENS PROCEDURE CALCULATIONS OR INTERPRETATION OF RESULTS DOCUMENTATION SPECIFICATION INFORMATION COMPARISON BETWEEN FOTP-85 AND IEC, ISO, AND CCITT REQUIREMENTS Cable Twisting Apparatus Cable Twisting Apparatus With Alternative Cable Twisting Apparatus Tensioning Applied With Tensioning Applied
23、Recommended Twist Lengths (LI Recommended Tensioning Loads Paqe 1 2 3 5 7 10 10 11 12 6 8 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EIA TIA-455-5A 92 3234bOO 0502533 163 =
24、 TIA/EA-455-85A Page 1 FOTP-85 FIBER OPTIC CABLE TWIST TEST (From EIA Standards Proposal No. 2371-A, formulated under the cognizance of TIA FO-6.4, Subcommittee on Fiber Optic Test Methods and Instrumentation, and TIA FO-6.7, Subcommittee on Fiber Optic Cables.) This FOTP is part of the series of te
25、st procedures included within Recommended Standard EIA/TIA-455. NOTE : This FOTP was originally published in FOTP-85. EIA RS-455-85 as 0 1. INTRODUION 1.1 Intent. The intent of this test is to establish the ability of a fiber optic cable (or fiber optic cable component, when appropriate) to mechanic
26、ally withstand twisting. 1.2 Measurements . observed: The following parameters may be measured or (a) (b) The number of broken fibers caused by twisting. Any change in the outer covering. (cl The change in optical measurement results caused by twisting. For a similar test for fiber optic connecting
27、devices, see FOTP- 3 6. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EIA TIA-455-85A 92 3234600 O502512 OTT TIA/EIA-455-85A Page 2 2. APPLICABLE DOCUMENTS specified heGein: E
28、IA/TIA-455-A The followina documents form a part of this FOTP to the extent “Standard Test Procedures for Fiber Optic Fibers, Cables, Transducers, Sensors, Connecting and Terminating Devices, and Other Fiber Optic Components IV FOTP-13 (EIA-455-13) FOTP-20 (EIA/TIA-455-20A) FOTP-36 (EIA-455-36A) FOT
29、P-46 (EIA/TIA-455-46A) FOTP-53 (EIA/TIA-455-53A) FOTP-61 (EIA/TIA-455-61) FOTP-78 (EIA/TIA-455-78A) CE1 IEC 794-1, Second Ed. Method IEC 794-1-E7 CE1 IEC 794-2, Second Ed. “Visual and Mechanical Inspection of Fiber, Cables, Connectors and/or Other Fiber Optic Devices“ “Measurement of Change in Optic
30、al Transmittance “Twist Test for Fiber Optic Connecting Devices“ “Spectral Attenuation Measurement for Long-Length, Graded-Index Optical Fibers“ “Attenuation by Substitution Measurement for Multimode Graded- Index Optical Fibers or Fiber Assemblies Used in Long Length Communications Systems“ “OTDR M
31、easurement of Fiber or Cable Attenuat ion “Spectral Attenuation Cutback Measurement for Single-Mode Optical Fi bers “Optical fibre cables, Part 1: Generic specification“ “Tors i on“ “Optical fibre cables, Part 2: Product specifications“ * in process of preparation. Pending publication of this revisi
32、on, use ANSI/EIA RS-455-20. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EIA TIA-455-85A 92 3234500 0502513 T3b . TIA/EIA-455-85A Page 3 3. APPARATUS The following apparatus
33、and equipment is required to perform this test: 3.1 misting Apparatus. The twisting apparatus consists essentially of two cable gripping devices or clamps, one fixed and one that can rotate, supported as appropriate, and adjustable as to distance between them. The rotating clamp is connected to suit
34、able turning equipment (e.g., a torquing lever). Any clamp supports used, the gripping devices, and the torquing equipment, shall all be such as to permit access to both ends of the cable specimen for optical testing as may be required. Suitable apparatus is illustrated in Figures 1, 2, and 3, but o
35、ther substantially equivalent apparatus may also be used. The cable gripping devices shall be such that (1) they may be tightened around the cable sufficient to prevent movement within the grip, (2) the clamps hold the cable firmly in a straight line, (3) the clamps induce neither localized twisting
36、 damage on the cable caused by the inside edge of the clamp nor undue localized concentration of pressure on the cable, and (4) the process of clamping does not induce any significant or accurately measurable attenuation increase (or no more than a negligible increase) in the specimen. 0 NOTE 1: Spl
37、it die blocks with tapered openings in various die opening sizes to accommodate varying cable diameters have been found to be suitable as clamps. The opening diameters shall be sufficient to hold the cable straight in the die without transferring the twist into the die. The die length shall be suffi
38、cient to provide adequate gripping surface. Die lengths of at least 30 mm (or 1.25 in.) have been found to provide adequate gripping surface for a small cable having a diameter equal to or less than the die length. 3.2 Tensioning Apparatus. If required by the Detail Specification and/or to minimize
39、specimen bending from a straight configuration, use weights or an appropriate loading mechanism to apply a tensile load to the cable gripping fixture (see Figures 2 and 3). Refer to Table 2 for recommended tensioning loads, 3.3 Optical Test Equipment. Use apparatus as described in FOTP-20 for measur
40、ing the change in optical transmittance (throughput) of the transmitting fibers. Alternatively, unless otherwise specified in the Detail Specification, use equipment as described in one of the following FOTPs for measuring attenuation for a particular type of fiber in the cable: Copyright Telecommun
41、ications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EIA TIA-455-85A 72 3234b1313 13502534 972 TIA/EIA-455-85A Page 4 - For multimode: FOTP-46, FOTP-53, or FOTP-61 - For single-mode: FOTP-61 or FOTP-78.
42、 Equipment for measuring the transmittance or attenuation shall be stable throughout the duration of a single pulse and over the period of time required to perform the measurement. Figure 1 Cable Twisting Apparatus Figure 2 Cable Twisting Apparatus with Tensioning Applied Copyright Telecommunication
43、s Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-FIA TIA-455-85A 92 3234600 05025115 809 TIA/EIA-455-85A Page 5 Figure 3 Alternative Cable Twisting Apparatus With Tensioning Applied 4. SAMPLING AND SPECIME
44、NS 4.1 Specimen - General. The specimen shall be a sample of fiber optic cable having a total length sufficient to permit the appropriate clamping and twisting, long enough to permit optical measurements (if required), and as required by 4.2 and 4.3. (NOTE: Do not confuse the “total specimen length“
45、 with the “twist length. ) Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EIA TIA-455-5A 92 3234b00 050251b 745 TIA/EIA-455-85A Page 6 4.2 Total Specimen Length. Unless otherwi
46、se specified in the Detail Specification, the minimum total specimen length shall be as follows: 4.2.1 The total specimen shall be sufficiently long to permit the twisting of the minimum length of cable required by 4.3. 4.2.1.2 For U.S. Military applications only, the total specimen length shall als
47、o be not less than 100 times the diameter of the finished specimen cable or not less than 1 m (39 in. ) , whichever is greater. 4.2.2 When optical measurements (change in optical transmittance or attenuation) must be made, the total specimen length shall also be such that the optical loss in the fib
48、er can be effectively monitored as required by the Detail Specification or by the referenced optical measurement FOTP, or both. 4.3 Specimen Length to be Wisted. The length of the specimen O to be twisted (LI shall be as specified by the Detail Specification. 4.3.1 If not specified by the Detail Spe
49、cification, maximum twist length (LI may be selected from Table 1, following, depending upon type of cable undergoing test: Table 1 Recumended Twist Lengths (L) Cable Typ e Outside Plant Cable Twist Lengths meter (feet) 4 i 13 1 Inside Cable - Riser 2 ( 6-6 1 Inside Cable - Plenum and General Purpose 1 ( 3.3 1 Inside Cable - General Purpose Interconnect 0.3 Copyright Telecommunicatio
