1、 TIA STANDARD FOTP-141 Twist Test for Optical Fiber Ribbons TIA-455-141September 1999 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Representing the telecommunications industry in association with the Electronic Industries Alliance ANSI/TIA/EIA-455-141-1999Approved: September 10, 1999Reaffirmed: May 10, 2
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21、or networking permitted without license from IHS-,-,-TIA/-455-141 Section FOREWORD I. 2. 3. 4. 5. 6. 7. 8. ANNEX A ANNEX B FOTP- 1 4 1 Twist test for optical fiber ribbons TABLE OF CONTENTS INTRODUCTION APPLICABLE DOCUMENTS APPARATUS SAMPLING AND SPECIMENS PROCEDURE CALCULATIONS OR INTERPRETATION OF
22、 RESULTS DOCUMENTATION SPEC I FI CATION I N FORMATION ( Typical Test Apparatus ) ( Comparison with Other Test Standards) Paqe . III 1 1 1 2 2 3 4 4 5 7 JGF, TIA SC FO-6.7, O1 /26/99 i Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproductio
23、n or networking permitted without license from IHS-,-,-TIA-455-141 This page intentionally left blank. JGF, TIA SC FO-6.7, O1 /26/99 11 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from I
24、HS-,-,-TIA/EIA 455-1 41 FOTP-141 Twist test for optical fiber ribbons Foreword (This Foreword is informative only and is not part of this Standard.) This document comes from EIA Standards Project No. 3487, formulated under the cognizance of TIA FO-6.7, Subcommittee on Optical Fiber Cables and TIA FO
25、-6.7.16 Working Group on Optical Fiber Ribbons. This FOTP is part of the series of test procedures included within Recommended Standard EIWIA-455-A. This standard contains two informative annexes. Key Words: mechanical, handling, structural, torsion JGF, TIA SC FO-6.7, O1 /26/99 . 111 Copyright Tele
26、communications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA/EIA-455-141 This page intentionally left blank. JGF, TIA SC FO-6.7, O1 /26/99 iv Copyright Telecommunications Industry Association Provided
27、 by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA/EIA 455-1 41 1. INTRODUCTION 1.1 Intent. The intent of this test is to determine an optical fiber ribbons mechanical ability to withstand dynamic twisting. 1.2 Scope. This test proced
28、ure provides conditions in which an optical fiber ribbon may be twisted in the presence of an applied tensile load. The twisting is performed dynamically over a short period of time under a fixed load condition. The performance of the ribbon is determined by its ability to withstand the test without
29、 structural failure. 1.3 Background. Ribbons are manufactured for a number of reasons, including, but not limited to, ease of handling, mass spliceability, and identification of individual fibers in high fiber count situations. Regardless of the intent, it is desired that fiber ribbons retain their
30、structure. One key factor in the stability of a ribbon is its ability to resist mechanical failure when twisted. 1.4 Hazards There are no substantial hazards which are known to be connected with this procedure. Due caution should be observed when cutting optical fiber ribbons, since debris may be th
31、rown off. 2. APPLICABLE DOCUMENTS The following documents form part of this FOTP to the extent specified herein: EIWIA-455-A “Standard Test Procedures for Optic Fibers, Cables, Transducers, Sensors, Connecting and Terminating Devices, and Other Fiber Optic Components“ FOTP-13 Visual and Mechanical I
32、nspection of Fiber, Cables, Connectors and/or Other Fiber Optic Devices. 3. APPARATUS The following apparatus and equipment are required to perform this test: 3.1 5X Magnifier. The magnifier is used for inspecting the test sp ci m n at the end of the test. The exact nature of this tool is unimportan
33、t, so long as it affords a clear and undistorted view of the specimen. JGF, TIA SC FO-6.7, O1 /26/99 1 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA/EIA-455-141 3.2 Test A
34、pparatus. sample is held vertically between two grip assemblies. constant axial load condition. The test apparatus is essentially a fixture in which a ribbon The ribbon is twisted under a The upper grip assembly shall be designed to hold the upper grip and allow only rotation about the vertical axis
35、. It shall hold the test specimen so that the center of rotation coincides with the geometric center of the specimens cross section. The lower grip assembly shall hold the lower grip and be free to move only along the vertical axis. The total weight of the lower grip assembly shall be equal to 500 I
36、 25 grams. This may be achieved by the addition of weights or through the design of the part itself. The lower grip assembly shall move smoothly and freely along the vertical axis. The grips shall not slip during the test. However, they shall not cause premature failure of the specimen (end effects
37、should be minimized). Many features of the test apparatus may be changed to suit the user so long as it remains functionally the same. A typical test apparatus is outlined in Annex A (See Figure 1). 4. SAMPLING AND SPECIMENS 4.1 Samples. otherwise specified in the Detail Specification. Samples may b
38、e taken at any point along a ribbons length unless 4.2 Specimen Preparation. No special conditioning is required for this test, unless otherwise specified in the Detail Specification. 5. PROCEDURE 5.1 Insert one end of the test specimen into the upper grip. Tighten the grip so that it holds the spec
39、imen firmly, but does not crush it. Rotate the upper grip so that the jaws are aligned with those in the lower grip (rotation stage at O“, or starting position). 5.2 Let the test specimen hang freely from the upper grip. Check the position of the sample and, if necessary, adjust it so that it comes
40、straight out of the grip. 5.3 Lift the lower grip assembly (this is the lower grip and the weighted plate attached to it). Manually verify its freedom of movement along the vertical axis. JGF, TIA SC FO-6.7, O1 /26/99 2 Copyright Telecommunications Industry Association Provided by IHS under license
41、with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA/EIA 455-1 41 5.4 Slide the free end of the test specimen into the lower grip. Raise or lower the lower grip assembly so that the length of ribbon between the upper and lower grips is 300 I 10 mm. Tighten t
42、he lower grip so that it holds the specimen firmly, but does not crush it. Mark the ribbon where it exits the upper and lower grips. 5.5 Allow the specimen and lower grip assembly to hang freely. Visually inspect the test specimen. It must hang straight down without kinks, curves or any other visibl
43、e deviations. The lower grip assembly must hang freely and be properly aligned within the test apparatus. The test specimen must come straight out of the jaws of both grips. Improper alignment of the test specimen will invalidate the test. Check the specimen for mechanical damage before starting the
44、 test, as well. 5.6 Rotate the upper grip 180 I IO“ in one direction and return to the starting (O“) position. Rotate the upper grip 180 I IO“ in the opposite direction, and again, return to the starting position. This constitutes one cycle. These rotations must be made smoothly and steadily and at
45、a rate of 10 to 20 cycles per minute. Repeat this step until twenty cycles have been petfo rmed. 5.7 Support the lower grip assembly so that tension is taken off of the test specimen. Release the specimen from the lower grip and return the lower grip assembly to its rest position. Release the test s
46、pecimen from the upper grip. 5.8 Using the 5X magnifier, visually inspect the test specimen for damage. Inspect only the segment which was twisted during the test. Use the marks from step 5.4 as a reference. Look for any signs of structural degradation. This would include, but not be limited to, cra
47、cks, tears, or separations of the matrix from the fiber. Refer to FOTP-13. 6. CALCULATIONS OR INTERPRETATION OF RESULTS 6.1 Calculations. No calculations are required. 6.2 Interpretation. Ribbons which exhibit structural degradation which is visible under 5X magnification shall be considered failed.
48、 6.3 Precision. This is a “pass/faiI“ type test. 7. DOCUMENTATION 7.1 Report the following information for each test: JGF, TIA SC FO-6.7, O1 /26/99 3 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without
49、license from IHS-,-,-TIA/EIA-455-141 7.1.1 Date of test. 7.1.2 Identification of procedure used (FOTP-141). 7.1.3 Sample identification. 7.1.4 Record the ribbon ID and any damage observed during the inspection. 7.1.5 Any special conditions, including: 7.1 5.a Any preconditioning or accelerated aging to which the specimen has been subjected. 7.1.5.b Any special co
