1、 TIA-455-244 November 2011Methods for Measuring the Change in Transmittance of Optical Fibers in Expressed Buffer Tubes When Subjected to Temperature Cycling ANSI/TIA-455-244-2011 APPROVED: OCTOBER 7, 2011 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest th
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22、 ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TIA-455-244iFOTP-244Methods for Measuring the Change in Transmittance of Optical Fibers inExpressed Buffer Tubes When Subjected to Temperature CyclingContentsForeword iii1 Introduct
23、ion 12 Normative References 13 Apparatus 23.1 Cable 23.2 Generic Apparatus: Splice case, Pedestal, or Closure 23.3 Environmental Chamber 23.4 Temperature Recording Device 23.5 Transmittance Equipment 34 Sampling and Specimens 34.1 Specimen and Test Sample 34.2 Cable Testing in a Generic Apparatus 34
24、.3 Sample Preparation 35 Procedures 45.1 Sample Positioning 45.2 Preconditioning 45.3 Test Conditions 56 Calculations 57 Documentation 58 Specification Information 6TIA-455-244This page left blank.TIA-455-244iiiFOTP-244Methods for Measuring the Change in Transmittance of Optical Fibers inExpressed B
25、uffer Tubes When Subjected to Temperature CyclingForeword(This Foreword is informative only and is not part of this Standard.)This document comes from TIA Project SP-3-0307 and was formulated under thecognizance of TIA FO-42.12, Subcommittee on Optical Fibers and Cables.This FOTP is part of the seri
26、es of test procedures included within RecommendedStandard TIA-455.NOTE This is the first and original issue of this FOTP.Key words: closure, express tube, midspan, outside plant, OSP, pedestal, tubeattenuation, tube contraction, tube shrinkageTIA-455-244This page left blank.TIA-455-24411 Introductio
27、n1.1 IntentThis test is applicable to cables containing a multiplicity of buffer tubes and specified formidspan access applications requiring expressed buffer tube storage (buffer tubesstored in their intact form; not cut, opened, or removed).Storing several meters of expressed tubes in pedestals or
28、 splice cases is common fieldpractice. This practice simplifies access to fibers for future reconfiguration or as acollateral result of accessing one or a few of the tubes in a cable.The procedure in this document tests the ability of tubes to withstand temperaturecycling without sustaining the spec
29、ified induced fiber attenuation when the tubes are notconstrained by other cable components or are only minimally constrained by slackmanagement devices typically used in splice cases or pedestals.Typical indications of failure are:1. A temporary or permanent change in optical throughput which excee
30、ds limitsstated in the Detail Specification.2. Cracks, blisters, or kinks of expressed buffer tubes.2 Normative ReferencesThe following standards contain provisions which, through reference in this text,constitute provisions of this Standard. At the time of publication, the editions indicatedwere va
31、lid. All standards are subject to revision, and parties to agreements based onthis Standard are encouraged to investigate the possibility of applying the most recenteditions of the standards indicated below. ANSI and TIA maintain registers of currentlyvalid national standards published by them.TIA-4
32、40-B (ANSI/TIA-440-B) Fiber optic terminologyTIA-455-B Standard Test Procedure for Fiber Optic Fibers,Cables, Transducers, Sensors, Connecting andTerminating Devices and Other Fiber OpticComponentsFOTP-3 (TIA-455-3B) Procedure to Measure Temperature Cycling Effects onOptical Fibers, Optical Cable, a
33、nd Other Passive FiberTIA-455-244Optic ComponentsFOTP-13 (TIA/EIA-455-13A) Visual and Mechanical Inspection of Fiber OpticComponents, Devices, and AssembliesFOTP-20 (TIA/EIA-455-20A) Measurement of Change in Optical Transmittance3 Apparatus3.1 CableThe cable to be tested shall be as specified in the
34、 Detail Specification.3.2 Generic Apparatus: Splice Case, Pedestal, or ClosureThis test procedure primarily evaluates the cable in a generic apparatus that simulates asplice case/pedestal/closure in the field as a system. It also allows for testing aparticular cable design and tubes to be installed
35、in a specific splice case, pedestal, orclosure, subject to the limitations noted in 4.3.3.3.3 Environmental ChamberThe environmental chamber shall have an operational range sufficient to cover thetemperature extremes required by this FOTP or by the Detail Specification. The rate ofchange of the cham
36、ber temperature shall be a maximum of 40 C per hour to avoidthermal shock. The chamber shall maintain a specified temperature within 2 Cthroughout the test duration. The test setup must ensure temperature homogeneityinside the whole chamber during the test. The chamber inside dimensions shall be lar
37、geenough to accommodate the sample and allow unrestricted air flow around the testsample. It may be desirable to have a window in the door to observe the sample duringthe test. A combination of hot and cold chambers is inappropriate for this test. Thechamber shall provide an access port or ports thr
38、ough which the fiber or cable ends orsensor wires may extend, and which shall have the capability of sufficiently sealing thecables and wires which may extend out of the chamber so that the specifiedtemperatures can be maintained.3.4 Temperature Recording DeviceA temperature recording device or devi
39、ces shall be used to provide a record of thetemperature throughout the test. It may be desirable to have a multi-channel recorder sothat temperatures measured at several points around the sample can be recorded. Therecorder shall have an accuracy of 1 C across the temperature range of the test.3.5 T
40、ransmittance EquipmentTIA-455-2443Equipment for measuring the change in transmittance (throughput) of the transmittingfibers shall be in accordance with FOTP-20. Alternatively, unless otherwise specified inthe Detail Specification, equipment for measuring attenuation as required by one of thefollowi
41、ng FOTPs for a particular type of fiber or device shall be used: For single-mode and multimode: FOTP-78, or FOTP-171Equipment for measuring the transmittance or attenuation shall be stable over thelength of time required to perform the measurement.4 Sampling and Specimens4.1 Specimen and Test Sample
42、The test specimen shall be a section of cable of sufficient length to enter and exit theenvironmental chamber, supply the section of expressed buffer tubes under test, andprovide coupling length inside or outside the chamber (as required; see clause4.3.3). The test sample shall be the cable specimen
43、 prepared and stored in thesplice case, closure, pedestal, or generic apparatus.4.2 Cable Testing in a Generic ApparatusThe generic apparatus is intended to facilitate testing, focusing on the cableperformance, and independent of any influence of a particular splice case, pedestal, orclosure. Other
44、splice case, pedestal, or closure systems may or may not properlyterminate the cable, which will affect the results.The generic apparatus shall be configured to properly terminate the cable end toprevent movement of cable components such as strength members and cable jacketsin a manner consistent wi
45、th the installation instructions. This includes features such aspositive stop strength member clamps and cable clamps that prevent slippage acrossthe specified temperature range. The buffer tubes must be stored in a coil that exceeds7.5 cm wide and 30 cm long. The tube shall not violate the manufact
46、urers minimumbend radius.4.3 Sample PreparationThe tubes to be tested must be a part of the sample exposed in the middle portion ofthe cable specimen. Testing buffer tubes which have not been cabled may yieldresults not indicative of actual field performanceTIA-455-2444.3.1 Following the cable manuf
47、acturers instructions, dissect the cable so as to freethe specified length of tubes from the cable. The specified length of tubes freed from thecable shall be as specified in the Detail Specification. Only the length which will bestored shall be exposed. Inspect the tubes to ensure they have not bee
48、n damagedbefore running the test.4.3.2 Following the cable manufacturers instructions, terminate the cable ends andstore the exposed tubes in the generic apparatus (or splice case/pedestal/closure, ifused).4.3.3 Ensure that the minimum 6 m (20ft) length of cable extends from the terminationpoints of
49、 the closure. This coupling length section mimics long lengths of cable in thefield, intended to preclude testing bias from the migration of fibers into or out of thesection under test.5 Procedure5.1 Sample Positioning5.1.1 Position the test assembly in the test chamber so that both macrobending andmicrobending of the optical fiber(s) are minimized. The fiber or cable leading out ofthe chamber shall be fed through the feed-through ports with enough length to allowhook-up to the measurement equipment. Care shall be taken to allow appropriateroom in the chamber for air circ
