1、 TIA DOCUMENT FOTP-91 Fiber Optic Cable Twist-Bend Test TIA-455-91 JANUARY 1986 (Reaffirmed June 1996) TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Industry Association represents the communications sector of NOTICE TIA Engineering Standards and Publications are designed to serve t
2、he public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for their particular need. The existence of such Pu
3、blications shall not in any respect preclude any member or non-member of TIA from manufacturing or selling products not conforming to such Publications. Neither shall the existence of such Documents preclude their voluntary use by non-TIA members, either domestically or internationally. TIA DOCUMENT
4、S TIA Documents contain information deemed to be of technical value to the industry, and are published at the request of the originating Committee without necessarily following the rigorous public review and resolution of comments which is a procedural part of the development of a American National
5、Standard (ANS). Further details of the development process are available in the TIA Engineering Manual, located at http:/www.tiaonline.org/standards/sfg/engineering_manual.cfm TIA Documents shall be reviewed on a five year cycle by the formulating Committee and a decision made on whether to reaffirm
6、, revise, withdraw, or proceed to develop an American National Standard on this subject. Suggestions for revision should be directed to: Standards configuration after specified cycles but with 1Qgd removed. Unless otherwise specified, the test cable shall be precon- ditioned on the reel for 24 hours
7、 at standard conditions as deined in EIA-455. PROBrTHRO -COPY E I A- 4 5 5-9 1 Page 3 FLEX AND TWIST-BEND TESTS . TAB.LE I SHEAVE DIAMETERS Test Condition Letter A B C D TABLE II TENSILE LOADING Cable Diameter Maximum Sheave Diameter as a Multiple of Cable Diameter As specified in. Detail Specificat
8、ion 20 x 10 x 5x . Minimum - .Load* mm . (-inches kq ;(pomas) . - - 3 (0.118) 1.5 (3.307) - 4 (0.157) 2.5 (5.512) - 6 (0.236) 4.0 (8,818) - 9 (0.354) 4.5 (9.921) 13 (0.512) 5.0 (11.023) - 18 (0.709) 5.5 (12.125) - - 24 (0.945) 6.5 (14.330) - 30 (1.181) 7.0 (15.432) * Increase load, if necessary, to
9、insure 180O contact with the sheave in the twist-bend test. e EIA-455-91 Page 4 4.3 Optical Transmittance Change Measurement .- The cable shall be prepared and tested in accordance with FOTP-20 (EIA-455-20), “Measurement of Change in Optical Transmittance.“ 4.4 Set up for Test Conditions .I, II. the
10、se supplementary requirements automatically apply whenever FOTP-91 is specified in u.S. Military documents or for any U.S. Military application. SI. ADDITIONS, DELETIONS, AND EXCEPTIONS TO ESA-455-91 The following changes are required for military applications: Sl.1 Test Equipment 51.1.1. Para. 2.4 Delete: Weights, per Table II. Substitute: Mass, 10 kg for 5 6.4 mm nominal O.D. cable, 25 kg for 2 6.5 mm nominal O.D. cable. 51.2 Figure 1 S1.2.1 Legend opposite “Mass“ Delete: (See Table II) Substitute: (See Para. 2.4)
