1、MIL-M-4924OA (CR) -. 21 April 1987 SUPERSEDING MIL-M-49240 (CR) 17 .November 1981 MILITARY SPECIFICATION MULTIPLEXER, TD-1235 (P) /TTC This specification is approved for use by the Communications- Electronics Command, Department of the Army -and is available for use by all Departments and Agencies o
2、f the Department of Defense. 1. SCOPE . 1.1 Scope. This specification covers the design, fabrication and testing necessary for the manufacture of the Multiplexer, TD- 1235(P)/TTC. This unit is one of the electronic units that comprise the Digital Group Multiplexer (DGM) family of cable system equip-
3、 ment developed by the Joint Tactical. Command, Control and Communi- cations Agency (JTC3A formerly TRI-TAC). See 6.1 for intended use and functional description of the unit. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. The following specification
4、s, standards, and handbooks form a part- of this specification to the extent specified herein. Unless otherwise specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the
5、 solicitation. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to Commander, US Army Communications- Electronics Command, ATTN: AMSEL-ED-LC, Fort Monmouth, New Jersey 07703 by using the self-address
6、ed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC No. N/A FSC 5820 DISTRIBUTION STATEMENT A. Approved .for public release; distribu- tion is unlimited. Copyright Communications - Electronics Command Provided by IHS under license
7、with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-47240A 58 777770b 0445725 5 = MIL-M-49240A (CR) SPECIFICATIONS Military MIL-P-116 MI L-P-11.2 6 8 MIL-M-13231 MIL-F-14072 MIL-E-55585 STANDARDS Military MIL-STD-105 MIL-STD-252 MIL-STD-454 MIL-STD-461A
8、Notice 4 MIL-STD-462 MIL-STD-781C Notice 3 MIL-STD-810D MIL-STD-1332 MIL-STD-2073-2 MIL-STD-45662 Preservation, Methods of Parts, Materials, and Processes Used in Electronic Equipment Marking of Electronic Items Finishes for Ground Electronic Equipment Electronics Equipment and Parts, Packaging of S
9、ampling Procedures and Tables for inspection by Attributes Classification of Visual and Mechanical Defects, for Equipment, Electronic, Wired and Other De- vices Standard General Requirements for Electronic Equipment Electromagnetic Interference Characteristics Requirements for Equipment, Subsystem a
10、nd System Electromagnetic Inter ference Characteristics, Measurement of Reliability Design Qualification and Production Acceptance Tests: Exponential Distribution Environmental Test Methods and Engineering Guidelines Definitions f Tactical, Prime, Precise, and Utility Ter- minologies for Classificat
11、ion of the DOD Mobile Electric Power Engine Generator Set Family Packaging Requirements Code Calibration System Requirements d 2 Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,- H
12、IL-M-24OA - 58 = 9997906 0445726 7 - W . M rL -E- 4 9-23 O( CR) 2.1.2 Other Government documents, drawinqs, and publications. The following other Government documents, drawings, and publications form a part of this specification to the extent specified herein. Unless otherwise specified, the issues
13、shall be those in effect on the date of the solicitation. SPECIFICATIONS Communications-Electronics Command I: CR-CX-0173-001 Nuclear Survivability/Vulnerability CR-CX-0 17 4-0 0 1 Provisions for the Family of Digi- tal Group Multiplexer Equipments TEMPEST Provisions for the Family of Digital Group
14、Multiplexer Equip- ments DRAWINGS Communications-Electronics Command DL-SM-B-876630 SM-D-884567 SM-D-884571 SM-D-884579 SM-D-959323 SM-E-986235 SM-E-986239 SM-E-986241 SM-E-986244 SM-E-986247 SM-E-986250 Multiplexer, TD-1235 (P) /TTC Circuit Card Assembly (CCA) , Mu 1 t i-Vdc CCA, AC Input CCA, Anal
15、og Applique Unit (AAU) CCA, Loop Modem CCA, Timing Generator CCA, BITE 2 CCA, Interface CCA, MUX/DEMUX CCA, Group Framing CCA, 52 VdC (Copies of specifications, standards, handbooks, drawings, publications, and other Government documents required by contractors in connection with specific acquisitio
16、n functions should be obtained from the contracting activity or as directed by the contracting activity.) 2.2 Order of precedence. In the event of a conflict between the text of this specification and the references (except for associated detail specifications, specification sheets or MS standards),
17、 the text of this specification shall take precedence. Nothing in this specification, however, shall supersede applicable laws and regulations unless a specific exemption has been obtained. cited herein, 3 Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for
18、ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-M-49240A 58 = 9999906 0445727 9 MIL-M-4924024 (CR) 3. REQUIREMENTS 3.1 First article units. When specified in the contract or purchase order, the contractor shall furnish first article units in accordance with 4.3. 3.2 C
19、onstruction. 3.2.1 Fabrication. The TD-1235 shall be constructed in accordance with the requirements of this specification and of DL- SM-B-876630 including the requirements for parts, materials and processes therein. 3.2.2 Printed wirinq boards. The printed wiring boards shall meet the requirements
20、of MIL-STD-454, Requirement 17. 3.2.3 Semiconductor devices and inteqrated circuits. The semiconductor devices and integrated circuits shall meet the requirements of MIL-STD-454, Requirements 30 and 64. 3.3 Parts, materials, and processes-qeneral. In addition to the requirements of this specificatio
21、n, the requirements of MIL-P- 11268 including the selection requirements therein shall apply. 3.4 Finish. The equipment shall be finished in accordance with MIL-F-14072 and the equipment drawing DL-SM-B-876630. 3.5 Markinq. The marking shall conform to MIL-M-13231, with approvals in accordance with
22、requirements specified in the contract or purchase order. 3.5.1 Serial numbers. (See 4.15) A unique serial number is required on each nomenclatured item and CCA. The numbers shall be consecutively assigned. 3.6 Electrical preconditioninq (burn-in). (See 4.6). Prior to submission to the specified qua
23、lity conformance inspections, each TD-1235 assembly shall be electrically preconditioned for a minimum of 48 hours operating time. The last 24 hours of electrical preconditioning shall be failure free. Each unit fabricated shall be subjected to this process. Failure free is defined as (i) no built-i
24、n test equipment (BITE) alarms during burn-in and (2) the successful completion of the operational test of 4.7.11 after burn-in. 4 Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
25、3.7 Electrical. (See 4.7) 3.7.1 Balanced equipment-side signal characteristics. (See 4.7.1) 3.7.1.1 Line-to-line voltage. (See 4.7.1.1) The line-to-line voltage shall be between +0.1 and +4.0 volts for a digital 1 and between -0.1 and -4.0 volts for a digital O, measured into a 100 ohm dummy load. 3
26、.7.1.2 Line-to-ground voltaqe. (See 4.7.1.2) The magnitude of the line-to-ground voltage shall not exceed 3 volts. 3.7.1.3 Clock/data phasing. (See 4.7.1.3) For those data signals having a related clock signal, the time difference between the upward transition of the ciock signal and either the upwa
27、rd or downward transition of the data signal shall be within t240 ns for group rate signals. Times shall be measured at the zero voltage point of the signals. 3.7.1.4 Offset. (See 4.7.1.4) The magnitude of the offset voltage measured between the center tap of a 100 ohm dummy load and ground shall no
28、t be greater than 3 volts. 3.7.1.5 Signal balance. (See 4.7.1.5). The magnitude of the diff2rence between the magnitudes of the digital 1 level and the digital O level shall be less than 10% of the larger of the two. 3.7.1.6 Slew rate. (See 4.7.1.6) When 100 feet of RG-l08A/U cable terminated in a 7
29、8 ohm dummy load is connected to the driver output, the transition between 240 mV (either direction) shall take no more than 10 ns for group rate signals. 5 Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reproduction or networking permitted wit
30、hout license from IHS-,-,-MIL-M-Ll7240A 58 977970b 04115729 2 MIL-M-49 240A (CR) 3.7.1.7 Receiver dynamic range. (See 4.7.1.7) The receiver shall deliver the proper digital output when a line-to-line voltase of +50 mV to 4V for a digital 1 or -50 mV to -4V for a digiti1 O is applied to the receiver
31、input terminals. 3.7.1.8 Input load impedance. (See 4.7.1.8) The input impedance shall be 100 ohms 510%. 3.7.1.9 Clock asymmetry. (See 4.7.1.9) The positive half of the clock waveform shall be equal to half the period 5120 ns for group rate timing signals. 3.7.1.10 Timinq modes. (See 4.7.1.10) 3.7.1
32、.10.1 Loop back timinq mode. Transmit timing shall be derived from the received group signal. The multiplexer shall accept receive group timing-frequency errors up to 250 ppm from the nominal. 3.7.1.10.2 Station clock mode. Transmit timing shall be derived from an external timing source. The receive
33、d group signal shall be slaved to this timing source by external means. When the external timing signal is absent, the transmit timing shall be derived from an internal timing source. The frequency of this timing source shall be within 5 40 ppm of the nominal frequency. 3.7.1.10.3 External clock/dat
34、a phasinq. The phase relation- ship between the station clock input or the group related timing input (depending on the timing mode selected) and the group data output shall be such that the negative to positive transition of the input timing shall lead the output data transitions by O 5 1/4 of the
35、bit interval. 3.7.2 Diqital channel characteristics. (See 4.7.2) 3.7.2.1 Output voltage. (See 4.7.2.1) The output voltage shall be 3 volts 2 15% peak-to-peak measured into a 125 ohm load. 6 Copyright Communications - Electronics Command Provided by IHS under license with CRAINot for ResaleNo reprodu
36、ction or networking permitted without license from IHS-,-,-3.7.2.2 Output waveshape. (See 4.7.2.2) Measured into a 125 ohm resistive load, the rise and fall times (10% to 90%) shall be between 0.65 and 3.0 microseconds. The droop shall be less than 5% of the peak-to-peak amplitude. 3.7.2.3 Input and
37、 output impedances. (See 4.7.2.3) The input and output impedance rnaqnitudes shall be 100 to 144 ohms frm 8 to 32 kHz and-75 to 144ohmc from 32 to 56 kHz. 3.7.2.4 Input voltaqes. (See 4.7.2.4) Proper operation shall occur over the input voltage range of 0.15 to 4.0 volts peak-to-peak. Proper operati
38、on shall be defined as a bit error rate (BER) of i x 10-6 or less. 3.7.3 Loop power feed. (See 4.7.3) Maximum output voltage shall be 56 Vdc into a 11,200 ohm resistive load. Minimum output currents shall be 68.8 mA into a 680 ohm resistive load. The loop outputs shall be short-circuit proof, both l
39、ine-to-line and line-to-ground. The powerfeed circuitry shall tolerate an initial current surge of 100 mA for up to 45 ms without power feed shutoff. 3.7.4 Idle loop. (See 4.7.4) When transmission from the DSVT has ceased on a loop, the loop modem shall send continuous ones on its equipment-side. 3.
40、7.5 Analoq channel characteristics. (See 4.7.5) 3.7.5.1 Analoq channel input/output impedances. (See 4.7.5.1) The impedance at the 4 wire analog channel input and output terminals shall be 600 ohms resistive with a minimum return loss of 20 dB over the frequency range 300 to 3400 Hz. 3.7.5.2 Lonqitu
41、dinal balance. (See 4.7.5.2) The longi- tudinal balance at the analog channel input and output terminals shall be not less than 40 dB when measured at a tone level of O dBm over the frequency range of 300 to 3400 Hz. 7 Copyright Communications - Electronics Command Provided by IHS under license with
42、 CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-47240A 5 7777906 0445731 O MIE-K-49240k (CR) 3.7.5.3 Frequency response. (See 4.7.5.3) The character- istics of the input/output filters shall be as follows: Frequency (Hz) Input Atten (dB) Output Atten (dB
43、) 76 200 1000 3500 8800 6 minimum 6 minimum 34-1 3+1 reTerence (O dB) reference (O dB) 3+1 o to 4 2minimum 45 minimum 3.7.5.4 Analog channel input and output test tone (See 4.7.5.4). The nominal test tone input and output level shall be -17 dBm at 820 Hz. 3.7.5.5 Envelope delay distortion. (See 4.7.
44、5.5) The envelope delay relative to 800 Hz of the input and output filters added together shall be less than 100 us from 800 to 3000 Hz. 3.7.5.6 Input-output linearity. (See 4.7.5.6) The output level of each channel shall be within 21.0 dB of the input signal level from full load tone (see 3.7.5.10)
45、 to 35 dB below full load tone when the input and output level selector switches are set to a sum of O dB. 3.7.5.7 Loopback switch. (See 4.7.5.7) A loopback switch shall be provided for each channel. It shall permit the digital output of the encoder to be looped to the digital input of the decoder.
46、The loopback switches shall be operable when the modules are inserted into the TD-1235. 3.7.5.8 Noise. (See 4.7.5.8) 3.7.5.8.1 Idle channel noise. (See 4.7.5.8.1) With one or more analog modules inserted in any TD-1235 and the remaining module positions filled with digital modules and the analog cha
47、nnels operating in the loopback mode, the signal measured on the analog inputs and outputs shall not exceed 33 dBrnC when al1 analog ports are terminated in 600 ohms and input and output level selector switches are set to O dB. 8 Copyright Communications - Electronics Command Provided by IHS under l
48、icense with CRAINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-LI9240A 58 = 9779906 04LI5732 2 W 3.7.5.8.2 Crosstalk level. (See 4.7.5.8.2) The interchannel and intra-channel crosstalk plus noise measured at either the near end or the far end of two AAU chan
49、nels shall not exceed 34 dBrnC when sending the 820 Hz test tone at full load. 3.7.5.9 Peak clipping. (See 4.7.5.9) For the +4 dBm input siqnal at 200 Hz, the output signal shall have a total distortion of less than 10% at a channel rate of 32 kb/s with the input level selector switch set to -10 dB and the output level selector switch set to +10 dB. 3.7.5.10 Full load tone. (See 4.7.5.10) The nominal full lo
