1、 METRIC MIL-DTL-24728/8A 10 December 2009 SUPERSEDING MIL-DTL-24728/8 28 June 2007 DETAIL SPECIFICATION SHEET INTERCONNECTING BOX, FIBER OPTIC, FUSION SPLICE TRAY AND TRAY HOLDER MODULE This specification is approved for use by all Departments and Agencies of the Department of Defense. The requireme
2、nts for acquiring the product described herein shall consist of this specification sheet and MIL-I-24728. Item # Part name 1 Base assembly 2 Cover assembly 3 Support angle assembly, right 4 Support angle assembly, left FIGURE 1. Splice tray holder module envelope. AMSC N/A FSC 6099 Provided by IHSNo
3、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24728/8A NOTES: 1. See table I for dimensions. 2. Table I inch equivalents are given for general information only. 3. The B dimension is only permitted in the axis perpendicular to the multiple cable penetrators
4、 (MCT). 4. Values provided are envelope dimensions. 5. Base assembly slots (8 places), support angle assembly right slots (4 places), and support angle assembly left slots (4 places) shall be at an angle of 401 degrees relative to the mounting plate. 6. Mounting hardware to include: (8) cross recess
5、ed pan head machine (PHM) screws, -20UNC-2A x “ long, stainless steel; (8) flat washers, “ stainless steel; (8) lock washers, split, “ stainless steel. 7. Tray to tray centerline spacing shall be no less than 20.0 mm. FIGURE 1. Splice tray holder module envelope Continued. TABLE I. Splice tray holde
6、r module dimensions. Millimeters Inches Letter Characteristic Max. Max. A Base assembly height 241.3 9.5 B Base assembly height with mounting plate 254.0 10.00 C Depth 112.0 4.41 D Mounting plate width 196.8 7.75 E Assembly width 218.8 8.61 2 Provided by IHSNot for ResaleNo reproduction or networkin
7、g permitted without license from IHS-,-,-MIL-DTL-24728/8A NOTES: 1. See table II for dimensions. 2. Table II inch equivalents are given for general information only. 3. Values provided are envelope dimensions. FIGURE 2. Splice tray envelope (including cover). TABLE II. Tray envelope dimensions. Mill
8、imeters Inches Letter Characteristic Min. Max. Min. Max. L Overall length 178.94 179.20 7.04 7.06 W Overall width 128.3 129.03 5.05 5.08 D Overall depth 9.5 9.7 0.37 0.38 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24728/8A NOTES: 1. Se
9、e table III for dimensions. 2. Table III inch equivalents are given for general information only. FIGURE 3. Tray base. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24728/8A TABLE III. Tray base dimensions. Millimeters Inches Letter Chara
10、cteristic Min. Max. Min. Max. DC Dimple center line 19.90 20.85 0.78 0.82 P3 Length to oval 118.10 121.80 4.65 4.80 S1 Side to hole one 11.65 13.30 0.46 0.52 S2 Side to hole two 18.35 19.90 0.72 0.78 S3 Side to hole three 24.75 25.95 0.97 1.02 SQ Hole width 3.05 3.23 0.12 0.13 TB Tab width 7.49 8.04
11、 0.29 0.32 TF End to near lip 172.98 174.02 6.81 6.85 TH Tab extension 7.38 8.08 0.29 0.32 TT Side to oval center 63.35 64.59 2.49 2.54 TY Splice tray width 128.30 129.03 5.05 5.08 V1 Oval length 9.39 9.65 0.37 0.38 V2 Oval width 12.48 12.83 0.49 0.51 NOTES: 1. See table IV for dimensions. 2. Table
12、IV inch equivalents are given for general information only. FIGURE 4. Tray cover. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24728/8A TABLE IV. Tray cover dimensions. Millimeters Inches Letter Characteristic Min. Max. Min. Max. C1 Edge
13、 to oval center line 53.35 53.85 2.10 2.12 LA Length overall 178.94 179.20 7.04 7.06 N1 Edge to near notch 13.30 14.30 0.52 0.56 P1 Edge to small oval 119.15 121.83 4.69 4.80 T5 Tray cover overall width 106.43 107.19 4.19 4.22 TA Tab set back 2.41 3.94 0.09 0.16 TC Tab to notch 173.95 175.39 6.85 6.
14、91 V1 Small oval length 9.39 9.65 0.37 0.38 V2 Small oval width 12.57 12.83 0.49 0.51 NOTES: 1. See table V for dimensions. 2. Table V inch equivalents are given for general information only. 3. Sleeve holders shall be installed such that A1 min./max. and A2 dimensions are met. FIGURE 5. Splice slee
15、ve holder positioning. TABLE V. Splice sleeve holder position dimensions. Millimeters Inches Letter Characteristic Min. Max. Min. Max. A1 Center to edge 16.15 24.60 0.64 0.97 A2 Sleeve holders outer edge to outer edge 39.0 40.0 1.54 1.57 B Top edge to bottom of holder 98.40 110.00 3.87 4.33 6 Provid
16、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24728/8A NOTES: 1. See table VI for dimensions. 2. Table VI inch equivalents are given for general information only. FIGURE 6. Non-metallic barrier installed inside tray. TABLE VI. Barrier dimensions.
17、 Millimeters Inches Letter Characteristic Min. Max. Min. Max. L Length 151.50 162.56 5.96 6.40 W Width 118.75 120.00 4.68 4.72 T Thickness 0.10 0.29 0.004 0.011 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24728/8A SCOPE: The detail requ
18、irements specified herein cover fusion splice trays and tray holder suitable for military use. Part or identifying number (PIN): See sample below and table VII. M 24728 / 8 XX Military designator Basic specification Specification sheet PIN code (see table VII) TABLE VII. PIN numbers. PIN code Descri
19、ption Figures 50 Splice tray holder with mounting hardware, for use with 129-mm (5-inch) width trays 1 51 Splice tray, 129-mm (5-inch) width 2-6 REQUIREMENTS: Temperature: Operating: -28 C to +65 C (-18.4 F to +149 F) Non-operating: -40 C to +70 C (-40 F to +158 F) Storage: -40 C to +70 C (-40 F to
20、+158 F) Design and construction: The physical characteristics of the splice tray holder shall be as shown on figure 1 and shall be such that it installs into the mounting holes as shown on figure 3 of MIL-I-24728/1 and does not affect the performance of MIL-I-24728 boxes including the ability to pro
21、perly install the cover. Mass: Splice tray: 150 grams (0.33 pounds) maximum Splice tray holder: 1,530 grams (3.37 pounds) maximum Stress relief: If manufacturing induces stress in the material, then splice tray holder shall be stress relieved in accordance with MIL-E-24142. Finish, interior and exte
22、rior surfaces: The surfaces shall be finished by one of the following methods: (1) coated with epoxy powder in accordance with MIL-PRF-24712 or (2) coated by chemical conversion materials in accordance with MIL-DTL-5541 (aluminum or aluminum alloys only). As guidance for painted surfaces, refer to M
23、IL-HDBK-2036. Part identification: The splice tray and tray holder shall be identified individually with markings that are permanent, clearly visible, and legible. Identification marking shall include the PIN and either the manufacturers CAGE code, name, or logo. Enclosure: Splice trays and tray hol
24、ders shall be designed such that all cables, cable components, fibers, connectors, splices, couplers, and mounting and stability supports for the above components entering, enclosed in, or exiting the components are not damaged during servicing of the components or during installation of additional
25、components. Covers of splice tray holder may be either hinged or removable. When hinged covers are used, they shall be capable of being fixed in the open position for servicing of the enclosed components. Mounting provisions: The splice tray holder shall install into the mounting holes as shown on f
26、igure 3 of MIL-I-24728/1. Cable interconnection interface: Cable feed shall not degrade the optical performance of fiber optic cables. 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24728/8A Interconnect organization: Splice tray holders a
27、nd splice trays shall have provisions for organizing fiber splices and fiber optic connectors, as specified herein, such that fiber splice organizers may be moved into serviceable positions without damage to any component, and their operational position shall minimize micro bends or macro bends in a
28、ny cable, optical fiber cable component (OFCC), or fiber. All buffered fibers, OFCCs, or fiber ribbons located between the input cables and the fiber organizers shall be routed along the side of the interconnecting box. Fiber and splice organizers: Splice organizers shall be universal or replaceable
29、 to accommodate and protect all types of fiber optic splices, both mechanical and fusion. The design shall allow the physical rearrangement of splices. The number and arrangement of splices shall be as specified herein. Splice and fiber organizers shall be designed in removable units to provide addi
30、tional storage capacity for fiber and splices. Accessibility: Regardless of the method used for mounting a splice organizer, all parts of the organizer for fiber interconnecting, splicing, maintenance, mounting, and cable additions shall be from the front. Splices, fiber organizers, and individual c
31、onnectors shall be accessed with the removal of, or damage to, other splices, fibers, and connectors. Hinged covers shall be designed to remain in an open position. This position shall not restrict access to the box. Splice tray compatibility: The splice tray shall meet the requirements of figures 2
32、-6 of this specification and shall pass requirements specified herein when used with a qualified splice tray holder as shown on figure 1. Splice tray density: The splice tray shall have the capability of holding at least 12 splices that are in accordance with MIL-PRF-24623/6. Splice tray holder comp
33、atibility: The splice tray holder shall meet the requirements of figure 1 of this specification and shall pass the requirements specified herein when used with qualified splice tray as shown on figure 2. Splice tray holder organization: The splice tray holder shall hold 4 splice trays in accordance
34、with figure 2 of this specification. Environmental/mechanical: The splice tray and splice tray holder shall be tested to the following MIL-I-24728 environmental and mechanical requirements: Cable retention: Applicable for splice tray only. Splice trays shall be tested in accordance with TIA-455-6. T
35、he test shall be performed with trays mounted in tray holders qualified to this specification and containing optical fiber splices qualified to MIL-PRF-24623/6. The minimum fiber to fiber splice tray pull out strength shall be 14.0 Newtons (3.1 pounds-force). The fiber shall meet the optical require
36、ments specified herein during and after the test. The fiber pull out force shall be tested by applying the axial tensile load specified between the fiber and the splice tray housing for a duration of one minute minimum. The change in optical transmittance shall be monitored during and after the test
37、. The fiber and splices shall show no evidence of jacket damage, clamp failure, distortion from bending of splice parts, or cable disengagement from the clamp. Vibration: Applicable with the following modification. Vibration test shall be performed with optical fiber splices in accordance with MIL-P
38、RF-24623/6 stored in the tray and tray holder and shall meet discontinuity during the test and change in optical transmittance requirements after the test. Test shall be in accordance with test condition II and test condition VII (test condition letter C) of TIA/EIA-455-11. The test duration for tes
39、t condition VII shall be 30 minutes for each axis. The frequency range of test for test condition II shall be extended to a low frequency of 4 Hertz. Shock: Applicable. Optical fiber splices in accordance with MIL-PRF-24623/6 stored in the tray and tray holder shall meet discontinuity during the tes
40、t and change in optical transmittance requirements after the test. Temperature/humidity cycling: Applicable with the following modification. Optical fiber splices in accordance with MIL-PRF-24623/6 stored in the tray and tray holder shall meet the change in optical transmittance requirements during
41、and after the test. Testing shall be done in accordance with TIA/EIA-455-5, Method B. Salt spray: Not applicable. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-24728/8A Temperature-life (life aging): Applicable with the following modifica
42、tion. Optical fiber splices in accordance with MIL-PRF-24623/6 stored in the tray and tray holder shall meet the change in optical transmittance requirements. Thermal shock: Applicable with the following modification. Optical fiber splices in accordance with MIL-PRF-24623/6 stored in the tray and tr
43、ay holder shall meet the change in optical transmittance requirements. Testing shall be done in accordance with TIA-455-71 using test condition C-0. Operating temperature (temperature cycling): Applicable with the following modifications. Optical fiber splices in accordance with MIL-PRF-24623/6 stor
44、ed in the tray and tray holder shall meet the change in optical transmittance requirements. Testing shall be performed in accordance with TIA-455-3 using the test condition schedule and soak times in accordance with table VIII. The change in optical transmittance shall be measured during and after t
45、he test. A post test visual examination of the test specimens shall reveal no leakage of waterproofing compounds or other apparent loss of sealing capability, no surface or identification marking impairment, nor any damage detrimental to the operation of the test specimens. The operating temperature
46、 range shall be as specified herein. Fluid immersion: Not applicable. Water pressure: Not applicable. Flame spread: Not applicable. Twist: Not applicable. Cable seal flexing: Not applicable. Compression resistance: Not applicable. Impact: Not applicable. 10 Provided by IHSNot for ResaleNo reproducti
47、on or networking permitted without license from IHS-,-,-MIL-DTL-24728/8A TABLE VIII. Temperature cycling steps. Step Action Temperature C (F) Duration 1 Maintain Room ambient 4 hours (min.) 2 Ramp to Low operating temp +0/-3 (+0/-5) 2 hours 3 Maintain Low operating temp +0/-3 (+0/-5) 2 hours (min.)
48、4 Ramp to 252 (774) 2 hours 5 Maintain 252 (774) 2 hours (min.) 6 Ramp to High operating temp +3/-0 (+5/-0) 1 hour 7 Maintain High operating temp +3/-0 (+5/-0) 2 hours (min.) 8 Ramp to 252 (774) 1 hour 9 Maintain 252 (774) 2 hours (min.) 10 Repeat steps 2 through 9, four additional times, for a total of five (5) cycles. Chemical: The splice tray and splice tray holder shall be tested to the following MIL-I-24728 chemical requirements: Flammability: Not applicable. Fungus: Applicable with the following modification. Splice tray materials composed of materials not listed as f
