1、 MIL-DTL-49285/23A 1 March 2010 SUPERSEDING MIL-C-49285/23 19 October 1989 DETAIL SPECIFICATION SHEET CABLE, SPECIAL PURPOSE, ELECTRICAL, NINE INDIVIDUALLY SHIELDED PAIRS OF 22 (7 X 30) AWG This specification is approved for use by all Departments and Agencies of the Department of Defense. The requi
2、rements for acquiring the product described herein shall consist of this specification sheet and MIL-DTL-49285. FIGURE 1. Cable illustration. AMSC N/A FSC 6145 INCH-POUND Inactive for new design after 16 June 1997. Provided by IHSNot for ResaleNo reproduction or networking permitted without license
3、from IHS-,-,-MIL-DTL-49285/23A 2 Engineering information: See table I. Note: Not for aerospace use. TABLE I. Description, electrical. Electrical characteristics Requirements Nominal capacitance between conductors Nominal capacitance between the conductor and the shield with one conductor tied to the
4、 shield Continuous working voltage Nominal capacitance between adjacent shields Continuous working voltage between adjacent shields Shield dc resistance 30 pF/ft (picofarads/foot) 55 pF/ft 300 V rms maximum between conductors 150 pF/ft 50 volts maximum 14 ohms/1,000 feet maximum TABLE II. Descriptio
5、n, physical. Components Construction details Number of pairs Conductor type and wire size Conductor stranding Conductor insulation Conductor insulation thickness Drain wire type and size Drain wire stranding Jacket material Jacket thickness Finished cable diameter Cable style (UL) Tensile strength (
6、jacket) Elongation (jacket) Overall cabling lay length Nine individually shielded Stranded tinned copper 22 AWG 7 X 30 AWG Polypropylene 0.010 inch nominal thickness Stranded tinned copper 22 AWG 16 X 34 AWG Polyvinyl chloride 0.031 inch 0.465 inch maximum outside diameter 2919 2,000 pounds per squa
7、re inch minimum 150 percent minimum 1.3 twists per foot 10 percent Cabled pair orientation: The position of the red and green pair shield shall determine the rotation direction for pair location (see figure 1). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from
8、 IHS-,-,-MIL-DTL-49285/23A 3 TABLE III. Shield color code. Pair numbers Shield color Center core 1stpair Outer layer 2ndpair 3rdpair 4thpair 5thpair 6thpair 7thpair 8thpair 9thpair Red Red Green Blue 1 Blue 2 Blue 3 Blue 4 Blue 5 Blue 6 REQUIREMENTS: Design and construction: (see tables II and III):
9、 Shield location and orientation. The polyester aluminum shield is to be located on the outer circumference of the pair, with the aluminum foil side outward. Insulation on the interior of the shield is to be complete with no aluminum available for contact. Drain wire location. The drain wire is to b
10、e spirally located between the noise reducing tape and the aluminum foil shield, and is to be in continuous contact with the aluminum surface of the foil shield and the noise reducing tape throughout the cable. Cable temperature rating. The cable temperature rating shall be -20C to +80C. Flammabilit
11、y. The cable shall pass UL 2556 flame test requirements. Shield integrity test.* Frequency Response * 100 kHz 115 dB below reference 500 kHz 107 dB below reference 1 MHz 101 dB below reference 5 MHz 87 dB below reference 10 MHz 81 dB below reference 15 MHz 77 dB below reference 20 MHz 73 dB below re
12、ference 25 MHz 69 dB below reference 30 MHz 65 dB below reference 100 MHz 45 dB below reference * Any two readings may deviate to a value of 0.9 times the stated limits. * All values are a minimum numerical value. Fixture resonance will occur between 40 and 70 MHz. Crosstalk test limits. All values
13、are minimums. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-49285/23A 4 Frequency (kHz) Near end crosstalk (dB) Far end crosstalk (dB) 40 57 57 70 54 53 100 52 51 1,000 53 51 Insulation resistance between shields: 100 megohms/1,000 feet min
14、imum. Durometer hardness. The cable jacket shall have a “Shore A” hardness of 82 5. Part or Identifying Number (PIN): The PIN shall be M49285/23. Changes from previous issue. The margins of this specification are marked with vertical lines to indicate where changes from the previous issue were made.
15、 This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to
16、the last previous issue. Referenced documents. In addition to MIL-DTL-49285, this document references the following: UL 2556. CONCLUDING MATERIAL Custodians: Preparing activity: Army CR DLA - CC Navy SH Air Force 85 DLA - CC Review activities: Army MI (Project 6145-2009-010) Air Force - 71 DLA IS NO
17、TE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change. You should verify the currency of the information above using the ASSIST Online database at http:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
