MIL-STD-188-110 Interoperability And Performance Standards For Data ModemsThis document establishes mandatory technical standards and design objectives \(DO\) that are necessary to ensure interoperability and to promote performance among data modulators-demodulators \(modems\) used in the voice frequency \(VF\) band of long-haul and tactical communications systems. This document also provides guidance to the designers of new data modems that incorporate characteristics not yet standardized by specifying the technical characteristics of data modems currently in the inventory. The purpose of this guidance is to ensure attainment of minimum acceptable performance and maximum interoperability between existing and future data modems with specified transmission channel conditions.

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MIL-STD-188-110C

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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