1、 TIA STANDARD Cable Flexing for Fiber Optic Interconnecting Devices TIA/EIA-455-1-B October 1998 TELECOMMUNICATIONS INDUSTRY ASSOCIATION ANSI/TI A/EIA-455-1-B Approved: October 1, 1998 Reaffirmed: April 21, 2008 NOTICE TIA Engineering Standards and Publications are designed to serve the public inter
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5、lication. 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 limit
6、ations before its use. (From Standards Proposal No. 3-2761, formulated under the cognizance of the TIA FO-4 Fiber Optics, FO-4.3 Subcommittee on Passive Optical Devices and Components.) Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION Standards and Technology Department 2500 Wilson Boulevard Arl
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22、OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. STD-EIA TIA-455-LB-ENGL 1778 = 3234b00 Ob13bb4 023 TINEIA-455-1 B FOTP-1 Cable flexing for fiber optic interconnecting devices Con tents FOREWORD 111 1 INTRODUCTION . 1 1.1 INTENT . 1 2 3 4
23、5 6 7 8 . 9 . 1 o . NORMATIVE REFERENCES 2 APPARATUS 2 SAMPLING AND SPECIMENS 4 PROCEDURES . 4 CALCULATIONS OR INTERPRETATION OF RESULTS . 6 DOCUMENTATION . 7 SPECIFICATION INFORMATION . 8 FIGURE 1, EXAMPLE OF FLEX TEST SETUP FOR MANUAL OPERATION . 9 FIGURE 2, EXAMPLE OF FLEX TEST SETUP FOR MOTOR DR
24、IVEN OPERATION . 10 ANNEX A (INFORMATIVE) . I1 ITU-T 1 1 Al . IEC . 11 A2 . i STD-EIA TIA-455-LB-ENGL 1778 D 323YbOO Obl3bb5 TbT TINEIA-455-1 B FOTP-1 Cable flexing for fiber optic interconnecting devices Foreword (This Foreword is informative only and is not part of this Standard.) This document co
25、mes from TIA Project No. 2761, and was formulated under the cognizance of TIA F0-6.3, Subcommittee on Fiber Optic interconnection Devices. This FOTP is part of the series of test procedures included within Recommended Standard E WTlA-455. NOTE - This FOTP was originally published in EIA455-1A as FOT
26、P-1. There is one informative Annex. Key words: cable flexing, multimode, single mode, interconnecting devices . III Previous page is blank STD-EIA TIA-455-LB-ENGL 1998 3234b00 ObL3bbb 9Tb 9 TlNEIA-455-I B - I Introduction 1.1 intent This test is intended to determine the ability of fiber optic inte
27、rconnecting devices, device interfaces, and strain reliefs to withstand bending and flexing stresses resulting from loads as might be experienced during installation and service conditions. 1.2 Typical indications of damage resulting from this test may be: a) Loss or degradation of optical transmitt
28、ance ability (both multimode and single-mode applications). b) Decrease in return loss (increase in reflectance) (single-mode applications only). c) Loss of seal integrity at the device interface. d) Broken parts, accessories, or cable fibers. e) Breakage, chipping or scratching of the interface. TI
29、NEIA-455-1 B 2 Normative references Test or inspection requirements and definitions may include, but are not limited to, the following references: EIA/TIA-440-A Fiber optic terminology EIAITIA-455-A Standard test procedures for fiber optic fibers, cables, transducers, sensors, connecting and termina
30、ting devices and other fiber optic components. FOTP-I 3 (EIATIA-455-13) Visual and mechanical inspection of fiber, cables, connectors, and/or other fiber optic devices. FOTP-20 (EIA/TIA-455-20A) Measurement of change in optical transmittance. FOTP-107 (EIATIA-455-107) Return loss for fiber optic com
31、ponents. 3 Apparatus 3.1 bending and flexing the connector/device interface and strain relief areas may be used. Test equipment similar to that shown in either Figure 1 or Figure 2, capable of 3.1.1 Figure 1: A mounting fixture to which the device under test can be mounted such that one of the attac
32、hed cables will be axially vertical and can be attached to a cycling head capable, unless otherwise specified by the Sectional or Detail Specification, of 180“ rotation, 90“ to either side of vertical. The head shall be operated at a maximum rate of 30 cycles per minute, unless otherwise specified i
33、n the Detail Specification. The mandrel diameter shall be large enough (Fig. I) such that it causes a negligible cable bend loss. The mandrels shall be positioned on the pendulum arm at a sufficient distance from the mounting device such that the mandrel position causes no more than a negligible cab
34、le loss. 2 STD-EIA TIA-Y55-LB-ENGL 1998 E 3231-1b00 Ob13bb 779 TINEIA-455-1 B Nominal Cable Diameter rnm inches 6.0 D I 18.0 0.23 D I 0.71 18.0 D I 30.0 0.71 DI 1.18 30.0 D 1.18 c D O .C D I 6.0 O c D I 0.23 3.1.2 Figure 2: An adjustable angle bracket with interchangeable connector or splice mountin
35、g plates, fastened to a cycling drive unit capable, unless otherwise specified by the Sectional or Detail Specification, of 180“ rotation, 90“ to either side of vertical. The drive unit shall be operated at a maximum rate of 30 cycles per minute, unless otherwise specified in the Detail Specificatio
36、n. The offset of the anglebracket shall be adjusted such that any vertical movement of the weight during the test is minimized. Load kg Ib 0.5 1.10 1 .o 2.20 2.0 4.41 3.0 6.61 3.2 Weights designed so that force applied to the fiber optic cable is coincident with the cable axis and clamping does not
37、crush the optical waveguide fiber(s) or cable. Unless otherwise specified by the Detail Specification, loads shall be as specified in Table I NOTE - A frequently used load for 3mm cable diameter is I kg. Table 1 Load Schedule 3 STD-IA TIA-455-LB-ENGL 1778 111 3234b00 ObL3bb7 b05 TINEIA-455-1 B 3.3 c
38、onnectors, and interfaces prior to and after testing. Inspection equipment (such as magnifiers, per FOTP-13) for examining cable, 3.4 Equipment to measure optical transmittance through the cable before and after testing in accordance with FOTP-20. If the stability of the source and detector is at le
39、ast one order of magnitude better than the allowable change in the connecting device in the test, a reference specimen or monitor fiber is not required. Otherwise a monitor fiber will be required. 4 Sampling and specimens 4.1 Test sample Each test specimen shall consist of a connector, mated connect
40、or pair, or splice, with each test end terminated to a i-1Om (3 to 33ft.) length of fiber optic cable, unless otherwise specified in the Detail Specification. The cable ends not under test shall be terminated or prepared to interface with the applicable measurement equipment for initial and after te
41、st measurements, as required by the Detail Specification. 5 Procedures 5.1 Unless otherwise specified in the Detail Specification, the fiber optic interconnecting device shall be preconditioned for 48 hours at standard atmospheric conditions as outlined in EIA/TIA-455-A, Sec. 6 (23+ 5OC, 20 to 70% R
42、elative Humidity and site ambient pressure; for U.S Militasr applications 2% 5C 45 to 75% Relative Humidity and 650 to 800mm Hg pressure). 5.2 would be considered degraded. Replace the sample if degradation is detected. Visually inspect the sample in accordance with FOTP-I3 for any attribute which 5
43、.3 FOTP-20 as applicable, to verify cable/connector assembly suitability for testing. Baseline optical transmittance measurements shall be made in accordance with NOTE 1 If neither a reference specimen nor a monitor fiber is used, then power ratios are not measured. 4 STD-EIA TIA-455-LB-ENGL 1978 32
44、34b00 ObL3b70 327 W TINEIA-455-I B NOTE 2 For single-mode applications it may be desirable to make both optical transmittance measurements and return loss measurements as part of the test procedure. Return loss measurements should be made in accordance with FOTP-107 as applicable. 5.4 The test speci
45、men shall be placed in the flex cycling apparatus (See Figure 1 or 2) and the initial optical transmittance measurements made in accordance with FOTP- 20. This initial reading should be made prior to adding the load as specified in Table I. 5.5 With the appropriate load added (See Table I), the opti
46、cal transmittance of the cablekonnector lead assembly shall be measured to ensure fixturing and cable clamping have not affected the cables optical transmittance beyond acceptable limits as specified in the Sectional or Detail Specification. 5.6 of 30 cycles per minute unless otherwise specified. Th
47、e cycling apparatus shall be operated for 10 cycles at a maximumcycling rate 5.7 The optical transmittance of the specimen under test shall be verified before and after exposure to the required number of cycles or at regular intervals as dictated in the Detail Specification. Any deviation in optical
48、 transmittance from the value recorded in paragraph 5.4 shall be considered to be caused by variations in the test specimen. 5.8 transmittance measurement as described in FOTP-20. At the end of the flex cycle, remove the load and take the final optical NOTE - This final measurement is taken with the
49、 load removed but with the cable/connector assembly still mounted on the test apparatus. 5.9 The test specimen shall be removed from the apparatus and visual inspection made in accordance with FOTP-13 (3X to 5X magnification). Examine samples for evidence of any physical degradation (Loss of seal integrity, broken parts, chips, cracks, scratches, etc.) Record observations of any degradation. 5 STD-EIA TIA-455-LB-ENGL 1778 m 3234b00 Db13b7L 2b3 m TINEIA-455-1 B 6 Calculations or interpretation of results 6.1 Calculate changes in optical transmittance as measured between 5.4 and
