1、1 TIA/EIA ANSI/TIA/EIA-455-25C-2002 Approved: January 24, 2002 STANDARD 1 FOTP-25 Impact Testing of Optical Fiber Cables 1 (Revision of TIAIEIA-455-25B) 1 JANUARY 2002 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Representing lhe lelwommunicalions industry in amcialion with lhe Eledronic Industries Allia
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7、 the applicability of regulatory limitations before its use. (From Standards Proposal No. 3-4600, formulated under the cognizance of the TIA FO-6.7 Subcommittee on Cables.) Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION 2002 Standards and Technology Department 2500 Wilson Boulevard Arlington,
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19、tion or networking permitted without license from IHS-,-,-TINE IA-455-25C FOTP-25 Impact testing of optical fiber cables Contents Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20、 . . . . . . . . . . . . . . . . . . . 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Normative references . . . . . . . . . . . . . . . . . . . . . . . . . . .
21、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Apparatus 4 Sampling and specimens . 5 Procedure . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . , . . . . . . . . . . . , . . , . , . ,. . . . . . . . . . . . . . 6 7 Calculations or int
22、erpretation of results Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Specification information . . . Table 1 Drop hammer mass and resulting test impact energy Table 2 Drop hamm
23、er masshest impact energy for U.S. military applications. Figure 1 Example apparatus for impact test Figure 2 Details of striking surface . Figure 3 Test sample mounting arrangement . . . . . . . . . . . . . . . . Figure 4 Location of impact point to optical launch and detection equipment Annex A Co
24、mparison between FOTP-25 and IEC and ITU-T requirements . iii 1 1 1 2 2 4 5 5 7 7 8 9 IO 11 12 i Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TINE IA-4552% This page left blank. II Co
25、pyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TINE IA-4552% FOTP-25 Impact testing of optical fiber cables Foreword (This Foreword is informative only and not pari of this Standard.) Thi
26、s document comes from TIA Standards Proposal No. 4600, formulated under the cognizance of TIA FO-6.7, Subcommittee on Optical Fiber Cable. This FOTP is part of the series of test procedures included within Recommended Standard TINEIA-455. NOTE: This FOTP was previously published in TINEIA-455-25B as
27、 FOTP-25. There is one informative Annex. Key Words: impact, fiber optic cable, cable mechanical test iii Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TINE IA-455-25C This page left b
28、lank. iV Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TINE IA-4552% Introduction This procedure provides a method to determine the ability of optical fiber cables to withstand impact
29、loads. The following parameters may be measured or observed: (a) The number of broken fibers caused by impacting the cable. (b) Damage to the outer sheath. (c) Changes in optical transmittance. This test method may be too stringent for some product designs and applications, and the recommended crite
30、ria may be quite moderate for other applications. When specifying product test requirements, Detail Specification writers should keep in mind the applicability of this test relative to their needs. Detail Specification writers should also recognize that there may be little or no justification for in
31、creasing or decreasing impact forces solely on the basis of an increase in cable diameter. Normative references Test or inspection requirements may include, but are not limited to, the following references: TINE IA-455-B Standard test procedures for fiber optic fibers, cables, transducers, connectin
32、g and terminating devices, and other fiber optic components Visual and mechanical inspection of fiber, cables, connectors, and/or other fiber optic devices Measurement of change in optical transmittance FOTP-13 (TINEIA-455-1 3A) FOTP-20 (TINEIA-455-20A) 3 Apparatus 3.1 The apparatus shall meet the i
33、ntent shown in Figure 1 as to drop height, hammer freedom, surface hardness, and anvil rigidity. The mass of the drop hammer, and the resulting energy delivered in the impact, is shown in Tables 1 and 2, or as given in the Detail Specification. If the test must be performed at other than standard co
34、nditions (5.1 ), the apparatus shall be suitable for placement and operation in an environmental chamber. Ensure that any frictional losses are minimized, or compensated for, such that the full intended impact energy is delivered to the cable. 1 Copyright Electronic Industries Alliance Provided by I
35、HS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIAIEIA-455-25C 3.2 3.3 3.4 4 5 5.1 5.2 5.3 5.4 The striking surface of the drop hammer shall be as shown in Figure 2. The drop hammer shall be adjusted so that the axis of the striking surfac
36、e is oriented 90 f 5“ to the axis of the test specimen. Secure the cable to the anvil such that (1) the clamps may be sufficiently tightened around the cable to prevent movement within the clamps, (2) the clamps hold the cable firmly to the flat surface and perpendicular to the hammer at the point o
37、f impact, and (3) the process of clamping does not induce any measurable attenuation increase in the specimen. The test sample mounting arrangement is shown in Figure 3. Use apparatus as described in FOTP-20 for measuring the change in optical transmittance of the monitored fibers. Equipment for mea
38、suring the transmittance shall be stable throughout the period of time required to perform the measurement. Sampling and specimens If fiber breakage only is to be monitored, the test specimen shall consist of a length of optical fiber cable, typical of the lot and a minimum of 700 mm (28 in) long. I
39、f optical transmittance changes are to be monitored, the test specimen shall consist of a section of optical fiber cable, typical of the lot and of a length sufficient to allow optical transmittance measurements of the required precision. A IO m (33 ft) minimum length is suggested (See Figure 4). Pr
40、ocedure Unless otherwise specified in the Detail Specification, precondition the test specimens for a minimum period of 24 hours under the conditions of TIAIEIA- 455-B, Section 6 (23 t 5 OC, and 20 to 70% or 45 to 75% Relative Humidity for non-military or military applications respectively). The Det
41、ail Specification shall specify the number of fibers in the cable to be tested for optical performance. Mount the test specimen in the apparatus as shown in Figure 3 and Figure 4. The midpoint of the striking surface of the hammer shall drop within 10% of the midpoint of the portion of the specimen
42、between the clamps. Unless otherwise specified in the Detail Specification, cables of other-than-round configuration (e.g., flat) shall be mounted such that the impact is delivered to the cable face that presents the greatest area to receive the impact (e.g., flat portion of flat cable). If fiber br
43、eakage is to be monitored, establish the optical continuity of the sampled fibers (see 5.2) in the test specimen before impact testing. Unless 2 Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from I
44、HS-,-,-TINE IA-455-25C otherwise specified by the Detail Specification, report optical continuity only after impact testing is complete. 5.5 If optical transmittance changes are to be measured, monitor the optical transmittance properties of the sampled fibers (see 5.2) in the test specimen in accor
45、dance with FOTP-20. Perform the reference measurement(s) after the specimen is installed in the test apparatus at the test temperature, but before any impact has been delivered. Unless otherwise specified in the Detail Specification, report only the difference between the reference measurements and
46、“after impact“ transmittance measurements for each fiber tested. 5.6 Unless otherwise specified in the Detail Specification: 5.6.1 For all except U.S. Military applications, the following procedure applies: 5.6.1 .I 5.6.1.2 5.6.1.3 5.6.1.4 5.6.1.5 5.6.1.6 5.6.1.7 5.6.1 .% Select the hammer mass (and
47、 resulting impact energy) from Table 1 Operate the apparatus for 2 impact cycles. (The sample has already been clamped in place and reference optical measurements made). Check for fiber breaks. If optical transmittance changes are to be measured, make the “after“ measurement per 5.5. Release the cab
48、le from the clamps. Index the cable 150 mm along its length to the next impact site, avoiding rotational movement, and re-clamp. If optical transmittance changes are to be measured, make the reference measurement after re-clamping, per 5.5. Repeat 5.6.1.2 through 5.6.1.5. Repeat again 5.6.1.2 throug
49、h 5.6.1.4. The cable has now been given two impacts at each of three different sites along the cable length. Remove the specimen from the apparatus and inspect all three sites for damage in accordance with the procedures of FOTP-13, except using normal, corrected vision without magnification. Record any damage observed. NOTE - Unless otherwise specified in the Detail Specification, cable exterior d
