1、 TIA STANDARD FOTP-87 Fiber Optic Cable Knot Test TIA-455-87-B (Revision of EIA-87-A) March 1993 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Representing the telecommunications industry in association with the Electronic Industries Alliance ANSI/TIA/EIA-455-87-B-1993Approved: March 1993Reaffirmed: May 1
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6、This Standard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations bef
7、ore its use. (From Standards Proposal No. 3-4448-RF2, 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
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21、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-Section Appendix Figure Copyright Telecommunications Industry Association Provided by IHS under license with EIA No reproduction or networking permitted without license from IHS - - - . . - - . - . . - FOTP-87 FIBER OPT
22、IC CABLE KNOT TEST CONTENTS Title INTRODUCTION APPLICABLE DOCUMENTS APPARATUS SAMPLING AND SPECIMENS PROCEDUFE CALCCLATIONS OR INTERPEETATION OF RESULTS DOCUMENTATION SPECIFICATION INFORMATION Comparison between FOTP-87 and IEC, CCITT, and IS0 Requirements Knot Test Setup with Mandrel-Procedure A Kn
23、ot Test Setup with no Mandrel-Procedure B Examples of Minimum Cross-sectional Diameter - i - Sold to:TIA, 01429452 Not for Resale,200415112 17:3:23 GMT Page Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted w
24、ithout license from IHS-,-,-TIA-155-87-B Page 1 FBER OPTIC CABLE KNOT TEST (From EM Standards Proposal Number 2285, formulated under the cognizance of TIA FO-6.7 Subcommittee on Fiber Optic Cables.) This FOTP is part of the series of test procedures included within Recommended i: Standard TIA/EIA-45
25、5. NOTE: This FOTP was previously published in EIA-455-87A as FOTP-87. 1. INTRODUCTION 1.1 Intent. The intent of this knot test is to determine the self-limiting protection built into a cable to prevent the optical fiber from being bent to the point of mechanical or optical failure, as specified in
26、the Detail Specification. 1.2 Scope. This test method may be used to test any type of fiber optic cable, using the appropriate Procedure (see 1.3 and Section 5) and test parameters, as required by the Detail Specification. 1.3 Summary of the Test Method. The test method evaluates the effect of a sev
27、ere bend in a fiber optic cable due to a knot. Two Procedures are described: Procedure A uses a mandrel to limit the degree of bend of the cable. Procedure B uses no mandrel, allowing the stiffness of the cable, together with the applied load, to limit the bend. Procedure A may be used to evaluate i
28、ncreases in fiber attenuation in a controlled manner. Procedure B may be used to determine the ultimate bending capability of the cable, considering fiber breakage or cable damage. (Note that Procedure B was the only procedure in the previous revisions of FOTP-87. See 1.6 for discussion.) 1.4 Proced
29、ure Defaults. Section 8 defines the detailed specification requirements that are required to be specified in the Detail Specification to properly utilize this FOTP. “Default“ requirements are those that apply if no other alternative requirements are given in the Detail Specification. Procedure Defau
30、lts are provided for the convenience of users of this FOTP. They are stated in Sections 3 and 5 and are summarized below: a. Test Procedure A. b. A mandrel diameter equal to the minimum bend diameter of the cable, for Procedure A only. (See 8.1.3.) c. Maximum test force as shown in the schedule in 5
31、.8.1. d Test force applied at a rate of 5 centimeters per minute and held at its maximum value for 1 minute. e. Visual examination, as detailed in 5.12. Copyright Telecommuncations Industry Association Provided by IHS under license with EIA No reproduction or networking permitted without license fro
32、m IHS Sold to:TIA, 01429452 Not for Resale,2004/5/12 17323 GMT Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1.5 Potential Failure Modes for this test include, but are not lim
33、ited to, the following: 1.5.1 Optical performance degradation. 1.5.2 Cracking, splitting, or tearing of the cable jacket. Although, permanent deformation of the cable jacket may occur, this would not normally result in cable rejection. Any additional failure criteria shall be specified in the Detail
34、 Specification. 1.6 Obsolete References. If a specification makes reference to either the original EIA RS-455-87 or to EIA-455-87A, such testing may be accomplished using Procedure B of this FOTP. Users of Detail Specifications having such obsolete references are directed to 1.3 and Section 5 for de
35、tails of the differences in Procedures A and B. In such cases, users should carefully consider the recommendation that Procedure A be used in lieu of Procedure B. Whenever specifications refer to FOTP-87 without citing a specific Procedure (A or B) or without indicating a specific document revision
36、level (-455-87, -455-87A, or -455-87B). the users should carefully consider the intent of the specification in determining whether to use Procedure A or B. (In general this applies to specifications published prior to the publication date of this revision.) 2. APPLICABLE DOCUMENTS: The following doc
37、uments form a part of this FOTP to the extent referenced herein: FOTP- 13, EIA/TIA-455- 13 Visual and Mechanical inspection of Fibers. Cables, Connectors andlor Other Fiber Optic Devices. FOTP-20, TIA/EIA-S-ZOA Measuremenr of Change in Optical Trumminance. FOP-46, EIA/TIA-455-46A Spectral Attenuatio
38、n Measurement for Long-Length, Graded-lndex Optical Fibers. FOV-53, EIA/TIA355-53A Attenuation by Substitution Measurement for Mdrimde Graded-lndex Oprical Fibers or Fiber Assemblies used in Long Length Communications System. FOTP-57, EIAfTIA355-57A Optical Fiber End Preparation and Examhution. FOTP
39、-6 1. TIA/EIA-S-IA OTDR Measurement of Fiber or Cable Attenuation. FOTP-78, EIWIA-455-78A Spectral Attenuation Cutback Measurement for Single- Mode Optical Fibers. CEI IEC 794-1. Second Ed. (1987) Optical fibre cables, Part I. Generic Specijication. In process of preparation. Pending publication of
40、this revision, use the previous issue. Copyright Telecommunicatons Industry Association Provided by IHS under license with EIA Sold to:TIA, 01429452 No reproduction or networking permitted wthout license from IHS Not for Resale.2004/5/12 17:3:23 GMT . - -. .- - . . . . -. . . - . - . . . . - Copyrig
41、ht Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TlA-455-87-B Page 3 3. APPARATUS: The test fixture (see Figures 1 and 2) shall consist of: 3.1 Appropriate clamping devices, as follows:
42、 3.1.1 A restraining clamp to prevent the cable from slipping while the test force is applied. 3.1.2 A loading clamp to permit the application of the test force to the cable. NOTE: The design of the restraining and force-application clamps used can be critical to the outcome of this test. The clamps
43、 shall be designed such that they are securely fastened to either the cable outer jacker or the strength members inside the cable, depending upon the cable design. The clamps shall be designed such that they will not result in degradation of the optical performance of the fiber during either the pre
44、paration or execution of the test. If clamping methods are specified in the Detail Specification, they shall be used. 3.2 A device to apply the test force, such as a test mass or a tensile testing machine. (The test force is discussed in 5.8.) 3.3 Mandrel: For Procedure A (defined in Section 3, a ma
45、ndrel with an appropriate diameter, and a length at least four times the mandrel diameter is required. Unless otherwise specified in the Detail Specification, use a mandrel diameter equal to the minimum bend diameter of the cable to be tested. 3 Optical measuring equipment: Use appropriate optical m
46、easuring equipment, as required by the Detail Specificadon. Procedures which may be specified include, but are not limited to, FOTP-20, FOTP-36, FOTP-53, FOTP-61, and FOTP-78. (See 5, 5.6, 5.8.3, and 5.10.) 4. SAMPLING AND SPECIhlESS Use a convenient length of the cable for the specimen. The specime
47、n shall be long enough so that the optical performance may be 3ccuntely monitored to the limits established in he Detail Specification. The recommended minimum specimen length is approximately 5 meters (or 15 fr.). 5, PROCEDURE Conduct the cable knot test using one of the following two Procedures: P
48、rocedure A or Procedure B. These two Procedures are illustrated in Figures 1 and 2, respectively. Unless otherwise specified iri the Detail Specification and with the exception stated in 1.6, Procedure A shall be used. Gopyrlght Telecommuncations industry Association Provided by IHS under license wi
49、th EIA No reproduction or networking permitted without license from IHS .- . . - . Sold to:TIA, 01429452 Not for Resale.2004/5112 17:3.23 GMT Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TL4-455-87-B Page 4 In Procedure A, a mandrel is placed inside the knot. This mandrel limits the severity
