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NOT

MEASUREMENT

SENSITIVE

MIL-STD-188-110D

29 December 2017

SUPERSEDING

MIL-STD-188-110C

w/CHANGE 1

3 JANUARY 2012

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-188-110D

iii

TABLE OF CONTENTS

D.1 TITLE PAGE

1 SCOPE....................................................................................................................................................1

1.1 S

COPE................................................................................................................................................1

1.2 A

PPLICABILITY..................................................................................................................................1

1.3 A

PPLICATION GUIDANCE...................................................................................................................1

2 APPLICABLE DOCUMENTS ............................................................................................................2

2.1 G

OVERNMENT DOCUMENTS..............................................................................................................2

2.1.1 Specifications and standards......................................................................................................2

2.1.2 Other Government documents and publications........................................................................3

2.2 N

ON-GOVERNMENT PUBLICATIONS. .................................................................................................3

2.3 O

RDER OF PRECEDENCE....................................................................................................................3

3 DEFINITIONS.......................................................................................................................................4

3.1 T

ERMS. ..............................................................................................................................................4

3.2 A

BBREVIATIONS AND ACRONYMS. ...................................................................................................5

4 GENERAL REQUIREMENTS .........................................................................................................10

4.1 F

UNCTIONAL EMPLOYMENT............................................................................................................10

4.2 C

OMMON 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-188-110D

5 DETAILED REQUIREMENTS ........................................................................................................16

5.1 F

REQUENCY 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...........................................................................................................................................17

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......................................................................................................................................................

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..................................................................................................................................................39

6.1 I

NTENDED USE.................................................................................................................................39

6.2 I

SSUE OF DEPARTMENT OF DEFENSE INDEX OF SPECIFICATIONS AND STANDARDS (DODISS)....40

6.3 S

UBJECT TERM (KEY WORD) LISTING..............................................................................................40

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