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MIL_STD_188_110B.1702.pdf
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MIL-STD-188-110B
27 APRIL 2000
SUPERSEDING
MIL-STD-188-110A
30 SEPTEMBER 1991
DEPARTMENT OF DEFENSE
INTERFACE STANDARD
INTEROPERABILITY AND PERFORMANCE STANDARDS
FOR DATA MODEMS
AMSC N/A AREA TCSS
DISTRIBUTION STATEMENT
: Approved for public release; distribution unlimited.
NOT MEASUREMENT
SENSITIVE
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MIL-STD-188-110B
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 3, dated 15 Nov 99.
2. Beneficial comments (recommendations, additions, deletions) and any pertinent data which
may be of use in improving this document should be addressed to: AFCA/ITS, Scott AFB, IL
62225-6343, by using the self-addressed Standardization Document Improvement Proposal (DD
Form 1426) appearing at the end of this document, or by letter.
3. 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.
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MIL-STD-188-110B
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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. ..............................................................................................................6
3 DEFINITIONS .....................................................................................................................................7
3.1 Terms. .....................................................................................................................................7
3.2 Abbreviations and acronyms. ................................................................................................8
4 GENERAL REQUIREMENTS ....................................................................................................... 13
4.1 Functional employment....................................................................................................... 13
4.2 Common parameters. .......................................................................................................... 13
4.2.1 Modulation and data signaling rates and tolerance............................................................ 13
4.2.2 Logic and signaling sense for binary signals. .................................................................... 14
4.2.3 Digital interface characteristics........................................................................................... 16
4.2.4 Terminal impedance for quasi-analog signals. .................................................................. 16
4.2.4.1 Modems used in multi-channel subsystems. ................................................................. 16
4.2.4.2 Modems used in single-channel radio subsystems........................................................ 16
4.2.5 Quasi-analog signal levels................................................................................................... 18
4.2.5.1 Modems used in multi-channel subsystems. ................................................................. 18
4.2.5.2 Modems used in single-channel radio subsystems........................................................ 19
4.2.6 Clock equipment, control, and timing. ............................................................................... 19
4.2.6.1 Transmission modes. ...................................................................................................... 19
4.2.6.1.1 Bit synchronous...................................................................................................... 19
4.2.6.1.2 Bit-by-bit asynchronous......................................................................................... 19
4.2.6.1.3 Character interval synchronous. ............................................................................ 19
4.2.6.2 Clock characteristics. ...................................................................................................... 20
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4.2.6.2.1 Modulation rates..................................................................................................... 20
4.2.6.2.2 Modulation rate stability. ....................................................................................... 20
4.2.6.2.3 Modulation rate phase adjustment......................................................................... 20
4.2.6.2.4 Output signal........................................................................................................... 20
4.2.6.2.5 Clock period............................................................................................................ 20
4.2.6.3 Clock/data phase relationship......................................................................................... 20
4.3 General design requirements............................................................................................... 22
4.3.1 Federal maritime interoperability requirements................................................................. 22
4.3.2 International interoperability requirements........................................................................ 22
4.3.2.1 Shore-to-ship broadcast systems. ................................................................................... 22
4.3.2.2 Maritime air communications systems. ......................................................................... 22
4.3.2.3 Radio teletypewriter systems.......................................................................................... 22
4.4 Data link protocol (optional)............................................................................................... 22
5 DETAILED REQUIREMENTS ...................................................................................................... 23
5.1 Frequency shift keying (FSK) data modulators-demodulators (modems) for
single-channel radio equipment.......................................................................................... 23
5.1.1 Narrow-shift FSK modem. ................................................................................................. 23
5.1.2 Wide-shift FSK modem. ..................................................................................................... 23
5.1.3 Speech-plus-telegraph operation. ....................................................................................... 23
5.2 FSK data modems for voice frequency (VF) channel operation. ..................................... 24
5.2.1 FSK data modems for 150 bits per second (bps) or less. .................................................. 24
5.2.1.1 Operational characteristics.............................................................................................. 24
5.2.1.2 Modulation characteristics.............................................................................................. 24
5.2.1.3 Carrier suppression. ........................................................................................................ 25
5.2.1.4 Break-in signal characteristics........................................................................................ 25
5.2.2 FSK data modems for 1200 bps or less.............................................................................. 25
5.2.2.1 Modulation characteristics.............................................................................................. 25
5.2.2.2 Modulator output spectrum. ........................................................................................... 25
5.3 HF data modems.................................................................................................................. 26
5.3.1 General requirements. ......................................................................................................... 26
5.3.1.1 Capability. ....................................................................................................................... 26
5.3.1.2 Voice digitization............................................................................................................ 26
5.3.1.3 Optional modes. .............................................................................................................. 26
5.3.1.4 Interface requirements. ................................................................................................... 27
5.3.1.4.1 Line-side data characteristics. ................................................................................ 27
5.3.1.4.2 LAN interface (DO). .............................................................................................. 27
5.3.1.4.3 Equipment side characteristics............................................................................... 27
5.3.1.4.4 Transmit override. .................................................................................................. 27
5.3.1.4.5 Buffering in synchronous serial mode................................................................... 27
5.3.1.5 Remote control interface................................................................................................. 27
5.3.1.5.1 Electrical interface.................................................................................................. 27
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5.3.1.5.2 Optional modem control driver. ............................................................................ 28
5.3.2 Serial (single-tone) mode. ................................................................................................... 28
5.3.2.1 General............................................................................................................................. 28
5.3.2.2 Sequencing of time phases. ............................................................................................ 28
5.3.2.2.1 Synchronization (sync) preamble phase................................................................ 30
5.3.2.2.2 Data phase............................................................................................................... 33
5.3.2.2.3 EOM phase. ............................................................................................................ 34
5.3.2.2.4 FEC coder and interleaver flush phase.................................................................. 34
5.3.2.3 Functional descriptions................................................................................................... 34
5.3.2.3.1 EOM sequence. ...................................................................................................... 34
5.3.2.3.2 Interleaver flush ...................................................................................................... 34
5.3.2.3.3 FEC encoder. .......................................................................................................... 34
5.3.2.3.4 Interleave load. ....................................................................................................... 37
5.3.2.3.5 Interleave fetch. ...................................................................................................... 38
5.3.2.3.6 Modified-Gray decoder.......................................................................................... 39
5.3.2.3.7 Symbol formation................................................................................................... 40
5.3.2.3.8 Scrambler................................................................................................................ 45
5.3.2.3.9 PSK modulation. .................................................................................................... 46
5.3.2.4 Waveform summary. ...................................................................................................... 46
5.3.2.5 Performance requirements.............................................................................................. 47
5.3.3 Frequency hopping mode (optional). ................................................................................. 48
5.3.4 Robust serial tone mode for severely degraded HF links (optional)................................. 48
5.4 Wireline data modems. ....................................................................................................... 49
5.4.1 General requirements. ......................................................................................................... 49
5.4.1.1 Interface requirements. ................................................................................................... 49
5.4.1.2 Output power level.......................................................................................................... 49
5.4.2 Performance requirements. ................................................................................................. 49
5.4.2.1 General............................................................................................................................. 49
5.4.2.2 BER for private line (leased) service point-to point circuits......................................... 49
5.4.2.3 BER and other parameters for PSN service dial-up circuits......................................... 49
5.4.2.4 Automatic answering and calling sequence for PSN. ................................................... 49
5.4.3 Data modems for 600 bps or 1200 bps............................................................................... 49
5.4.4 Data modems for 2400 bps. ................................................................................................ 50
5.4.5 Data modems for 4800 bps. ................................................................................................ 50
5.4.5.1 Fallback operation........................................................................................................... 50
5.4.5.2 Optional modes. .............................................................................................................. 50
5.4.6 Data modems for 9600 bps. ................................................................................................ 50
5.4.6.1 Private line operation. ..................................................................................................... 50
5.4.6.2 Fallback operation........................................................................................................... 50
5.4.6.3 Switched network operation (U.S. PSN, foreign push-to-talk (PTT) and Digital
Switched Network (DSN)). ............................................................................................ 51
5.4.7 Data modems with data signaling rates greater than 9600 bps. ........................................ 51
6 NOTES............................................................................................................................................... 52
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