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美军标MIL-STD-188-110C
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NOT
MEASUREMENT
SENSITIVE
MIL-STD-188-110C
23 SEPTEMBER 2011
SUPERSEDING
MIL-STD-188-110B
27 APRIL 2000
DEPARTMENT OF DEFENSE
INTERFACE STANDARD
INTEROPERABILITY AND PERFORMANCE STANDARDS
FOR DATA MODEMS
AMSC N/A AREA TCSS
DISTRIBUTION STATEMENT A: Approved for public release; distribution unlimited.
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MIL-STD-188-110C
ii
FOREWORD
1. This Military Standard is approved and mandatory for use by all Departments and Agencies
of the Department of Defense (DoD) in accordance with Joint Technical Architecture (JTA)
Version 6, dated 3 October 2003.
2. This document contains technical standards and design objectives for minimum interface and
performance standards pertinent to voice frequency band modulators-demodulators (modems)
which operate in both long-haul and tactical communications systems. The terms "system
standard" and "design objective (DO)" are defined in FED-STD-1037. In this document, the
word "shall" identifies mandatory system standards. The word “should” identifies DOs that are
desirable but not mandatory.
3. Comments, suggestions, or questions on this document should be addressed to Oklahoma City
Air Logistics Center (OC-ALC)/ENSDAA, 3001 Staff Drive, Tinker AFB, OK 73145 or e-
mailed to af71@tinker.af.mil. Since contact information can change, you may want to verify the
currency of this address information using the ASSIST Online database at
https://assist.daps.dla.mil.
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MIL-STD-188-110C
iii
TABLE OF CONTENTS
TITLE PAGE
1 SCOPE ................................................................................................................................................... 1
1.1 Scope. .............................................................................................................................................. 1
1.2 Applicability. ................................................................................................................................... 1
1.3 Application guidance. ..................................................................................................................... 1
2 APPLICABLE DOCUMENTS ........................................................................................................... 2
2.1 Government documents. ................................................................................................................. 2
2.1.1 Specifications and standards. .......................................................................................................... 2
2.1.2 Other Government documents and publications. .......................................................................... 3
2.2 Non-government publications. ....................................................................................................... 3
2.3 Order of precedence. ....................................................................................................................... 3
3 DEFINITIONS ...................................................................................................................................... 4
3.1 Terms. .............................................................................................................................................. 4
3.2 Abbreviations and acronyms. ......................................................................................................... 5
4 GENERAL REQUIREMENTS ......................................................................................................... 10
4.1 Functional employment. ............................................................................................................... 10
4.2 Common parameters. .................................................................................................................... 10
4.2.1 Modulation and data signaling rates and tolerance. ..................................................................... 10
4.2.2 Logic and signaling sense for binary signals. .............................................................................. 11
4.2.3 Digital interface characteristics..................................................................................................... 12
4.2.4 Terminal impedance for quasi-analog signals. ............................................................................ 12
4.2.4.1 Modems used in single-channel radio subsystems. ........................................................... 12
4.2.4.2 Quasi-analog signal levels. ................................................................................................. 13
4.2.5 Clock equipment, control, and timing. ......................................................................................... 13
4.2.5.1 Transmission modes. .......................................................................................................... 13
4.2.5.2 Clock characteristics. .......................................................................................................... 13
4.2.5.2.1 Modulation rates. .......................................................................................................... 13
4.2.5.2.2 Modulation rate stability. ............................................................................................. 13
4.2.5.2.3 Modulation rate phase adjustment. .............................................................................. 13
4.2.5.2.4 Output signal. ............................................................................................................... 14
4.2.5.2.5 Clock period. ................................................................................................................ 14
4.2.5.3 Clock/data phase relationship. ............................................................................................ 14
4.3 General design requirements. ....................................................................................................... 15
4.3.1 Federal maritime interoperability requirements. ......................................................................... 15
4.3.2 International interoperability requirements. ................................................................................. 15
4.3.2.1 Shore-to-ship broadcast systems. ....................................................................................... 15
4.3.2.2 Maritime air communications systems. ............................................................................. 15
4.3.2.3 Radio teletypewriter systems. ............................................................................................. 15
4.4 Data link protocol (optional). ....................................................................................................... 15
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MIL-STD-188-110C
iv
5 DETAILED REQUIREMENTS ........................................................................................................ 16
5.1 Frequency shift keying (FSK) modems for single-channel radio equipment. ........................... 16
5.1.1 Narrow-shift FSK modem. ........................................................................................................... 16
5.1.2 Wide-shift FSK modem. ............................................................................................................... 16
5.2 FSK data modems for voice frequency (VF) channel operation (withdrawn). ......................... 16
5.3 HF data modems. .......................................................................................................................... 16
5.3.1 General requirements. ................................................................................................................... 16
5.3.1.1 Capability. ........................................................................................................................... 17
5.3.1.2 Voice digitization. ............................................................................................................... 17
5.3.1.3 Optional modes. .................................................................................................................. 17
5.3.1.4 Interface requirements. ....................................................................................................... 18
5.3.1.4.1 Line-side data characteristics. ...................................................................................... 18
5.3.1.4.2 LAN interface (DO). .................................................................................................... 18
5.3.1.4.3 Equipment side characteristics (informative). ............................................................ 18
5.3.1.4.4 Transmit override. ........................................................................................................ 18
5.3.1.4.5 Buffering in synchronous serial mode. ....................................................................... 18
5.3.1.5 Remote control interface. ................................................................................................... 18
5.3.1.5.1 Electrical interface. ....................................................................................................... 18
5.3.1.5.2 Optional modem control driver. .................................................................................. 18
5.3.2 Serial (single-tone) mode. ............................................................................................................. 18
5.3.2.1 General. ............................................................................................................................... 18
5.3.2.2 Sequencing of time phases. ................................................................................................ 19
5.3.2.2.1 Synchronization (sync) preamble phase. .................................................................... 21
5.3.2.2.2 Data phase..................................................................................................................... 24
5.3.2.2.3 EOM phase. .................................................................................................................. 25
5.3.2.2.4 FEC coder and interleaver flush phase. ....................................................................... 25
5.3.2.3 Functional descriptions. ...................................................................................................... 25
5.3.2.3.1 EOM sequence. ............................................................................................................ 25
5.3.2.3.2 Interleaver flush ............................................................................................................ 25
5.3.2.3.3 FEC encoder. ................................................................................................................ 25
5.3.2.3.4 Interleave load. ............................................................................................................. 28
5.3.2.3.5 Interleave fetch. ............................................................................................................ 29
5.3.2.3.6 Modified-Gray decoder. ............................................................................................... 30
5.3.2.3.7 Symbol formation......................................................................................................... 31
5.3.2.3.8 Scrambler. ..................................................................................................................... 36
5.3.2.3.9 PSK modulation. .......................................................................................................... 37
5.3.2.4 Waveform summary. .......................................................................................................... 38
5.3.2.5 Performance requirements. ................................................................................................. 38
5.3.3 Frequency hopping mode (optional). ........................................................................................... 39
5.3.4 Robust serial tone mode for severely degraded HF links (optional). ......................................... 39
6 NOTES ................................................................................................................................................ 40
6.1 Intended use. ................................................................................................................................. 40
6.2 Issue of Department of Defense Index of Specifications and Standards (DODISS). ............... 40
6.3 Subject term (key word) listing. ................................................................................................... 40
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MIL-STD-188-110C
v
LIST OF FIGURES
FIGURE 1. STANDARD INTERFACE BETWEEN DATA TERMINAL EQUIPMENT AND
DATA CIRCUIT-TERMINATING EQUIPMENT. ....................................................................... 12
FIGURE 2. SERIAL (SINGLE-TONE) WAVEFORM FUNCTIONAL BLOCK DIAGRAM ....... 20
FIGURE 3 AN EXAMPLE OF EQUIPMENT INTERFACE BLOCK DIAGRAM. ........................ 22
FIGURE 4 FEC ENCODER BLOCK DIAGRAM ............................................................................. 27
FIGURE 5. STATE CONSTELLATION DIAGRAM .......................................................................... 35
FIGURE 6. RANDOMIZING SHIFT REGISTER FUNCTIONAL DIAGRAM ............................... 37
LIST OF TABLES
TABLE I. REFERENCE LIST FOR MODEM APPLICATIONS. ...................................................... 10
TABLE II. LOGIC AND SIGNAL SENSE FOR BINARY SIGNALS. .............................................. 11
TABLE III. CHARACTERISTIC FREQUENCIES OF FSK DATA MODEMS FOR
SINGLE-CHANNEL RADIO EQUIPMENT. ................................................................................ 16
TABLE IV. ERROR CORRECTING CODING, FREQUENCY HOPPING OPERATION. ............ 26
TABLE V. ERROR-CORRECTING CODING, FIXED FREQUENCY OPERATION. ................... 28
TABLE VI. INTERLEAVER MATRIX DIMENSIONS. ..................................................................... 29
TABLE VII. BITS-PER-CHANNEL SYMBOL. ................................................................................... 30
TABLE VIII. MODIFIED-GRAY DECODING AT 2400 BPS AND 4800 BPS. ............................... 31
TABLE IX. MODIFIED-GRAY DECODING AT 75 BPS (FIXED FREQUENCY) AND
1200 BPS. ........................................................................................................................................... 31
TABLE X. CHANNEL SYMBOL MAPPING FOR 75 BPS. .............................................................. 33
TABLE XI. ASSIGNMENT OF DESIGNATION SYMBOLS D1 AND D2. .................................... 34
TABLE XII. CONVERSION OF TWO BIT COUNT VALUE TO THREE BIT SYMBOL. ........... 34
TABLE XIII. CHANNEL SYMBOL MAPPING FOR SYNC PREAMBLE. .................................... 36
TABLE XIV. FREQUENCY-HOPPING OPERATION WAVEFORM CHARACTERISTICS. ..... 38
TABLE XV. FIXED-FREQUENCY OPERATION WAVEFORM CHARACTERISTICS. ............ 38
TABLE XVI. SERIAL (SINGLE-TONE) MODE MINIMUM PERFORMANCE. ........................... 39
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