MIL-STD-188-172 Base Document:1989

1 SCOPE
    1.1 Purpose
    1.2 Scope
    1.3 Application
    1.4 System standards and design objectives
    1.5 Tailoring
2 APPLICABLE DOCUMENTS
    2.1 Government documents
    2.1.1 Standards
    2.2 Order of precedence
    2.3 Source of documents
3 DEFINITIONS
    3.1 Definitions of terms
    3.1.1 Character set
    3.1.2 Data rate
    3.1.3 Intercharacter interval
    3.1.4 Mode I
    3.1.5 Mode II
    3.1.6 Mode V
    3.1.7 Mode VI
    3.1.8 Mode VII
    3.2 Definitions of abbreviations and acronyms
4 GENERAL REQUIREMENTS
    4.1 Mode II channel coordination procedure
    4.2 Duplex operation
    4.3 Character codes
    4.3.1 CONUS eight-bit character code
    4.3.2 OCONUS eight-bit character code
    4.3.3 IA No 2
    4.4 Character transmission
    4.5 Message format
5 DETAILED REQUIREMENTS
    5.1 Mode II channel coordination procedure
    5.2 Character codes
    5.2.1 Eight-bit coded environment
    5.2.2 IA No 2 code
    5.3 Character structure
    5.3.1 Eight-bit coded environment
    5.3.1.1 Ten-bit structure
    5.3.1.2 Eleven-bit structure
    5.3.2 IA No 2
    5.3.2.1 Seven-bit structure
    5.3.2.2 Eight-bit structure
    5.4 Message framing and control
    5.4.1 SOM sequence
    5.4.1.1 IA No 2
    5.4.2 EOM sequence
    5.4.3 CANTRANS sequence
6 NOTES
    6.1 Mode II throughput calculations
    6.1.1 Example
    6.1.2 Tabulated transmission times
    6.2 Key word listing
FIGURES
1 Mode II data codes-eight bit coded environment
2 Mode II data codes - IA No 2
3 Mode II, seven-bit IA No 2 code-transmission
    sequence for SOM
4 Mode II, seven-bit IA No 2 code-transmission
    sequence for EOM
5 Mode II, seven-bit IA No 2 code-transmission
    sequence for CANTRANS
TABLES
Table I Mode II CONUS eight-bit character set-odd
         number of logical 1 bits per character
Table II Mode II OCONUS eight-bit character set-even
         number of logical 1 bits per character
Table III International Alphabet No 2 (1A No 2) -
           American version
Table IV Mode II transmission in time in seconds for a
           6900 character message
Appendixes
Appendix A DEPARTMENT OF DEFENSE DIRECTIVE 4640.11: 21
            DECEMBER 1987: SUBJECT: MANDATORY USE OF
            MILITARY TELECOMMUNICATIONS STANDARDS IN THE
            MIL-STD-188 SERIES
Appendix B LIST OF ABBREVIATIONS AND ACRONYMS USED IN
            MIL-STD-188-172







  

Ensures interoperability and to promote commonality of communications equipment and subsystems using the Mode II channel coordination procedure.

This document specifies the minimum requirements necessary to implement information and record traffic exchange among data communications systems employed in long haul and tactical communications networks.