1、28 February i983 3- MIL-S-28851A 9 January 1981 MILITARY SPECIFICATION SWITCHBOARD, TELETYPEWRITER SIGNAL , SECURE SB-391 7/BGC AND RECEIVER AUDIO SB-3918/BRR This specification is approved for use by the Naval Electronic Systems Comnand, Department of the Navy, and is available for use by all Depar
2、tments and Agencies of the Department of Defense. 1. SCOPE 1.1 SCO e: This specification covers two 16 by 16 switching matrices. One is a secure tele- type switc + ing matrix that connects certain devices to teletypewriter and cryptographic equipment, as well as to several minicomputer input/output
3、(I/O) channels, hereinafter referred to as Unit A. The other is a receiver audio switching unit that connects several receiver outputs to specified audio equipment, hereinafter referred to as Unit B. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. Unless otherwi
4、se specified!, the following specifications, standards, and handbooks of the issue listed in that issue of the Department of Defense Index of Specifications and Standards (DoDISS) specified in the solicitation form a part of this specifica- tion to the extent specified herein. SPECIFICATIONS MILITAR
5、Y MIL-P-642 MIL-C-5015 MIL-E-15090 MIL-E-16400 MIL-E-1 7555 $TANDARDS MILITARY MIL-STD-105 MIL-STD-108 MIL-STD-109 MIL-STD-167-1 MIL-STD-188-114 Plugs, Telephone, And Accessory Screws, General Speci f icat ion For Connectors, Electrical, Circular Threaded, AN Type, General Specification For Enamel,
6、Equipment, Light-Gray (Formula No. 111) Electronic, Interior Communication And Navigation Equipment, Naval Ship And Shore: General Speci- fication For Electronic And Electrical Equipment , Accessories And Repair Parts, Packaging And Packing Of Sampling Procedures And Tables For Inspection By Attribu
7、tes Definitions Of And Basic Requirements For Enclosures For Electric And Electronic Equipment Quality Assurance Terms And Definitions Mechanical Vibrations Of Shipboard Equipment (Type I - Environmental And Type II - Internally Excited) Military Characteristics Of Digital Interface Circuits Benefic
8、ial comments (recomendations, additions, deletions) and any pertinent data which may be of use in improvin this document should be addressed to: Comnand (ELEX-81 ll, Washington, DC 20363, by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of
9、 this document, or by letter. Commander, Naval Electronic Systems Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-28851B (EC) MIL-STD-189 MIL-STD-454 MIL-STD-461 MIL-STD-462 MIL-STD-471 MIL-STD-781 MIL-STD-81 O MIL-STD-965 MIL-STD-1472 MIL-STD-
10、1680 Racks, Electrical Equipment, 19-Inch And Associated Panels Equipment Electromagnetic Emission And Susceptibility Requirements For The Control Of Electromagnetic Interference Electromagnetic Emission Characteristics, Measure- ment Of Maintainabi 1 i ty Demonstration Reliability Design Qualificat
11、ion And Production Acceptance Tests : Environment Test Methods Parts Control Program Human Engineering Design Criteria For Military Systems, Equipment And Facilities Installation Criteria For Shipboard Secure Electri- cal Information Processing Systems Standard General Requirements For Electronic i
12、Exponent ia1 Distribution 2.1.2 Other Government publication. NATIONAL SECURITY AGENCY The following other Government publication forms a part of this specification to the extent specified herein. NACSEM 5100 A Compromising Emanations Laboratory Test Standards (CELTS) Electromagnetics (Copies of spe
13、cifications, standards, and publications required by marhfacturers in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer.) 2.1.3 Order of precedence. and the references cited herein, the text of this specification
14、 shall take precedence. 3. REQUIREMENTS 3.1 General requirements. The teletypewriter signal and receiver audio switchboard shall 3.1.1 First article. When specified, a sample shall be subjected to first article In the event of a conflict between the text of this specification - be in accordance with
15、 MIL-t-16400, except as hereinafter specified. nspection (see 4.3 and 6.3). 3.1.1.1 Modular. construction. Modular construction shall be in accordance with Requirement 73 of MIL-STD-454. 3.1.1.2 Parts control. The parts to be incorporated in the equipment shall be controlled 3.1.1.3 Fungus nutrient
16、parts or materials. Fungus nutrient parts of materials shall not 3.1.1.4 Descri tion. Unit A shall have the capability of switching binary direct current have the capability of switching audio signals in the range of 300 hertz (Hz) to 3500 Hz and a digitized audio signal of 25 kilohertz (kHz) bandwi
17、dth from each of 16 inputs to 16 output devices. The switching in each unit shall be performed by thumbwheel switches mounted on the front panel of the enclosure. on switch cylinder dial through a fixed window. The information that shall be imprinted on the input equipment list card attached to the
18、front panels of Units A and B is specified in 3.1.1.6. output equipment (switch) legend attached to the front panels of Units A and B is specified in 3.1 J.7. in accordance -965, Procedure 1. be used in the equipment. signals of rates + up o O0 baud from each of 16 input devices to 16 output devices
19、. Unit B shall The input equipment connection status shall be indicated by numbers displayed 3.1.1.5 Front panel diagrams. FIGURE 1 shows the front panel layout of both Units A and B. The information that shall be imprinted on the 2 Provided by IHSNot for ResaleNo reproduction or networking permitte
20、d without license from IHS-,-,-MIL-S-2B853B 58 M 7777706 0355533 3 M n i 8 .a I lo lo O - 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-2885LB 58 = 7777706 0355534 5 3.1.1.6 Input equipment list card nomenclature. The input equipment list c
21、ards for Units A and B shall be labeled as follows: Unit A Unit B T/W switch T/W switch position Input equi pinent position Input equipment 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 KYBD #I KYBD f2 KYBD 83 KYDB 14 TT-603 SIU PNTR SIU SSIXS WRR-7 CH A WRR-7 CH B WRR-7 CH C WRR-7 CH D KWR-37 KW-7(R) ON-1
22、 43 il (R) ON-143 #2(R) SPARE/OFF 1 2 3 4 5 6 7 .8 9 10 11 12 13 14 15 16 1051#1 USB 105191 LSB 105182 USB 1051#2 LSB WRR-3 R-1738 wsc-3#1 wsc-3#2 SPARE SPARE SPARE SPARE SPARE SPARE SPARE SPARE/OFF 3.1.1.7 Output equipment (switch) legend nomenclature. The output equipment (switch) legend for Units
23、 A anseled as follows: Unit A Unit B Switch Label Switch Label 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 PNTR #1 PNTR #2 PNTR #3 PNTR 84 TT 605 81 TT 605 #2 SIU KYBD SIU SSIXS SIU VERDIN KWR-37(1) KW-i(T) ON 143 #l(T) ON 143 #2(T) MONITOR SPARE SPARE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 SPKR #1 SPKR
24、#2 SPKR 83 SPKR #4 URA-17 CH A URA-17 CH B CV-2460 KY-8 KY-75 USQ-76 USB USQ-76 LSB NAV CTR RHMS MONITOR SPARE SPARE 3.1.2 Crosspoint diagrams. 3.1.3 Switch characteri.stics. Thumbwheel switches used for both Units A and B shall be FIGURE 2 shows the crosspoints that are required to be actuated for
25、Unit A. FISURE 3 shows the crosspoints that are required to be actuated for Unit B. such that switch actuation will provide separate contacts for both the signal lines and the signal return 1 i nes. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-S
26、WITCH li1 INPUT EQUIPMENT SWITCH POSITION CONNECT ION .FOR OUTPUT CONN OUTPUT I! EQUIPMENT - 1 1 J17 PNTR Il X 5 - xx K K KX KX - 2 I 518 I PNTR 12 I 16- xx xx xx xx xx xx xx - - x-. x- xx xx xx xx _- 1 X 3 J19 PNTR 13 4 J 20 PNTR 14 ) , I I 5 1 52 I I TT 605 #1 Ix xx 1 1 SI0 KYBD f sru ssrxs 52 5 S
27、IU VERDIN y t 16 332 I SPARE NOTE: Rear panel connectors. FIGURE 2. SB-3917 crosspoint interconnection diagram. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-ZBBSLB 58 W 7773906 0155536 7 1 I II r 71 517 2 518 MIL-S-288151 B (EC) OUT PUT EQ
28、UI PEIENJ SPKR 11 SPkR f2 SPKR f3 I 7 I 523 CV-2460 MON I TOR SPARE . _ . . _ - - - .- _ SPARE ItJPUT EQUI PHEKT C0i:NECT IOK. FOR SUIT CH POSI T 1 OK NOTE: Rear panel connectors. FIGURE 3. SB-3918 crosspoint interconnection diagram. IKPUT F UIPi+CNT . 1-16 52 3 1-16 53 6 Provided by IHSNot for Resa
29、leNo reproduction or networking permitted without license from IHS-,-,-MIL-S-251B 58 9 777770b 0155537 O M .MIL-S-28851B( EC) 3.1.4 Unit A interface requirements. Unit A shall be designed to operate in accordance with the low-level input and output (positive and negative 6 fl volt (V) standard inter
30、face requirements of MIL-STD-188-114. and 3.1.4.2. 3.1.4.1 low-level circuits, does not exceed 100 ohms for currents whose magnitude is less than 0.01 ampere (A). used in low-level circuits, is 6 kil ohms (kohms). The maximum total input capacitance of the device shall be 2500 picofarads. carrying t
31、he following types of signals: A smary of pertinent characteristics is included in 3.1.4.1 Input equipment impedance. The output impedance of an input equipment, used in 3.1.4.2 Output equipment resistance. The minimum input resistance of an output equipment, 3.1.5 Unit B interface requirernents. Th
32、e switchboard crosspoints shall be capable of a. b. 6OO-ohm balanced audio signals from 300 Hz to 3500 Hz, up to 20 milliwatts (mW) 600-ohm unbalanced digitized audio signals of 25 kHz bandwidth, up to 20 mW 3.1.5.1 Terminal impedance. The switchboard shall accmdate 1/0 devices having terminal 3.1.5
33、.2 1/0 power levels. The nominal power levels available at the I/O terminals of the impedance of 600 ohms in the frequency range between 300 Hz and 3500 Hz. switchboard shall be O decibels (db) referred to one milliwatt (dem). 3.2 Characteristics. 3.2.1 Equipment selection. thumbwheel switches locat
34、ed on the front panel of each unit. output device, and the positions on a switch shall represent the input devices that can be connected to that output device. on either unit shall appear through the display window. specific equipment connection is specified in 3.1.1.6. mnitor jack to permit the mon
35、itoring of any of the input devices. LOC MON. Selection of 1/0 device conditions shall be made by use of Each switch shall represent an 3.2.2 Display nomenclature. The number of the input device selected by a thumbwheel switch The number in the display window for a 3.2.3 Units A and B monitor jacks.
36、 Units A and B shall each have a front panel local This jack shall be labeled 3.2.4 Internal power supply requirements. With low-level switching, no internal power supply is required to produce the keying voltage for the output switch. from the input device. This voltage is derived 3.2.5 Transmissio
37、n performance requirements. Each unit shall conform to the transmission characteristics specified in 3.2.5.1 and 3.2.5.2. 3.2.5.1 Unit A transmission performance requirements. For rates up to 2400 baud, Unit A shall conform to, or exceed, the following transmission characteristics: a. b. Crosstalk i
38、solation shall be 60 dB minimum. c. Insertion loss through the switch shall not exceed 0.5 dB. Noise on any connection through the switch, when idle and properly terminated, caused by the switch itself, shall not exceed -69 dBm in a 3200-Hz bandwidth between 300 Hz and 3500 Hz. on another connection
39、 or due to any other switch function not associated with the connection measured, shall not exceed a 4-millivolt (mV) peak when measured across a 600-ohm load. of each other when a symmetrical binary signal is passed through the switch. For this specifi- cation, balance shall be: Impulse noise on an
40、y connection, when idle and properly terminated, due to switching d. Balance between the marking and spacing voltages shall be within one percent “pos - “neg - “pos + “neg 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-S-28851B 58 W 999990b 03
41、55538 2 48.26 (19) MIL-S-28851 B( EC) 50.8 (20) 13.34 (5.25) 9. (21 1 (including rear connect ors ) 3.2.5.2 Unit B transmission performance requirements. Unit B shall conform to the following .transmission characteri st ics : a. l-kHz test tone. b. 3500 Hz and shall be 40 dB minimum for frequencies
42、between 3500 Hz and 25 kHz. the fundamental for frequencies between 300 Hz and 25 kHz. Insertion loss through the switch shall not exceed 0.5 dB when measured with a Crosstalk isolation shall be 60 dB minimum for frequencies between 300 Hz and Harmonic distortion through any switch connection shall
43、be at least 40 dB below Intermodulation distortion through any switch connection shall be at least 40 dB e. Delay distortion through any switch connection shall not exceed 30 microseconds f. Maximum signal power that shall be passed by a switch connection without limiting c. d. . . below the fundame
44、ntal for frequencies between 300 Hz and 25 kHz. *. in the frequency band between 300 Hz and 25 kHz. or overloading shall be at least 20 mW (+13 dBm) for frequencies between 300 Hz and 25 kHz. g. Longitudinal balance of any connection through the switch shall be at least h. Attenuation of all frequen
45、cies between 300 Hz and 3500 Hz shall be within the 40 dB for frequencies between 300 Hz and 3500 Hz. limits of i1.0 dB with respect to the attenuation at 1000 Hz, and the attenuation of all frequencies greater than 3500 Hz and less than 25 kHz shall be within the limits of 11.5 dB with respect to t
46、he attenuation at 1 kHz. i. Noise on any connection through the switch, when idle and properly terminated, caused by the switch itself, shall not exceed -60 dBm in a bandwidth between 300 Hz and 25 kHz. Impulse noise on any connection, when idle and properly terminated, due to switching on another c
47、onnection, or due to any other switch functions not associated with the connectiqn, shall not exceed a 4-mV peak amplitude when measured across a 600-ohm load over 1 megahertz bandwidth. and 25 kHz shall have a return loss of at least 20 dB when referred to a 600-ohm resistance. electrical processin
48、g systems as specified in MIL-STD-1680 and NACSEM 5100 A. maximum dimensions and weight shown in TABLE 1. j. Input and output impedance of the switch in the frequency band between 300 Hz 3.2.6 Security criteria. 3.2.7 Physical characteristics. Both Units A and B shall be housed in enclosures with th
49、e Unit A shall conform to the applicable criteria for secure TABLE I. Dimensions and weight. I I I I 1 I Weight (in.) I kilograms (pounds ) Depth Height (in. $1 I cm (in.) 3.2.7.1 Mountin . Units A and B, with enclosures, shall be capable of being mounted in a 3.2.7.2 Connectors. Rear panel connectors for both Units A and B shall be as follows: standard 48.26din.) electrical equipment rack as specified in MIL-STD-189. Input co
