1、INCH-POUNDMIL-DTL-49285/3A 15 May 2009 SUPERSEDING MIL-C-49285/3 19 October 1989 DETAIL SPECIFICATION SHEET CABLE, SPECIAL PURPOSE, ELECTRICAL, NINE INDIVIDUALLY SHIELDED PAIRS OF 22 AWG SOLID WIRE Inactive for new design after 16 June 1997.This specification is approved for use by all Departments a
2、nd Agencies of the Department of Defense. The requirements 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 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from
3、 IHS-,-,-MIL-DTL-49285/3A Engineering information: See table I. 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 shield Conti
4、nuous working voltage Nominal capacitance between adjacent shields Continuous working voltage between adjacent shields Shield dc resistance 40 pF/ft (picofarads/foot) 77 pF/ft 300 V rms maximum between conductors 150 pF/ft 50 volts maximum 14 ohms/1,000 feet maximum TABLE II. Description, physical.
5、Components Construction details Number of pairs Conductor type and wire size Conductor insulation Conductor insulation thickness Drain wire type and size Jacket material Jacket thickness Finished cable diameter Cable style (UL) Tensile strength (jacket) Elongation (jacket) Overall cabling lay length
6、 Nine individually shielded Stranded tinned copper 22 AWG Polyvinyl chloride 0.013 inch nominal thickness Stranded tinned copper 22 AWG Polyvinyl chloride 0.038 inch 0.440 inch maximum outside diameter 2464 2,000 pounds per square inch minimum 150 percent minimum 1.3 twists per foot 10 percent Cable
7、d pair orientation: The position of the red and green pair shield shall determine the rotation direction for pair location (see figure 1). Shield color code. See table III. 2Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-49285/3A TABLE III.
8、Shield color code. Pair numbers Shield color 1stpair 2ndpair 3rdpair 4thpair 5thpair 6thpair 7thpair 8thpair 9thpair Red center core Red Green Blue 1 Blue 2 Blue 3 Blue 4 Blue 5 Blue 6 REQUIREMENTS: Design and construction. See table II. Shield location and orientation. The polyester aluminum shield
9、 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 be spirally located between the noise reducing tape and the alum
10、inum 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. Flammability. The cable shall pass UL 2556 flame test requirements. Shield
11、 integrity test.* Frequency Response * 100 kHz 114 dB below reference 500 kHz 105 dB below reference 1 MHz 99 dB below reference 5 MHz 85 dB below reference 10 MHz 79 dB below reference 15 MHz 74 dB below reference 20 MHz 70 dB below reference 25 MHz 65 dB below reference 30 MHz 61 dB below referenc
12、e 100 MHz 42 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 are minimums. 3Provided by IHSNot for ResaleNo reproduction or n
13、etworking permitted without license from IHS-,-,-MIL-DTL-49285/3A 4Frequency (kHz) Near end crosstalk (dB) Far end crosstalk (dB) 40 58 58 70 56 55 100 54 53 1,000 55 52 Insulation resistance between shields. 100 megohms/1,000 feet minimum. Durometer hardness. The cable jacket shall have a “Shore A”
14、 hardness of 82 5. Part or Identifying Number (PIN). The PIN shall be M49285/03. Changes from previous issue. The margins of this specification are marked with vertical lines to indicate where changes from the previous issue were made. This was done as a convenience only and the Government assumes n
15、o 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 the last previous issue. Referenced documents. In addition to MIL
16、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 6145-2008-152) Air Force 99 NOTE: 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-,-,-
