MIL-STD-188-173 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 Definition of terms
3.1.1 Character set
3.1.2 Data rate
3.1.3 Intercharacter interval
3.1.4 Pause
3.1.5 Mode I
3.1.6 Mode II
3.1.7 Mode V
3.1.8 Mode VI
3.1.9 Mode VII
3.2 Definitions of abbreviations and acronyms
4 GENERAL REQUIREMENTS
4.1 Mode V channel coordination procedure
4.2 Duplex operation
4.3 Character codes
4.3.1 Continental United States (CONUS) eight-bit character
        code
4.3.2 Outside Continental United States (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 V channel coordination procedure
5.2 Character codes
5.2.1 Eight-bit environment
5.2.2 IA No. 2 code
5.3 Character structure
5.3.1 Eight-bit 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
5.5 Mode V channel coordination
5.5.1 General
5.5.2 Intercharacter intervals
5.5.2.1 Send Detect interval
5.5.2.2 Send detect interval
5.5.2.3 Receive detect interval
5.6 Control sequence
5.6.1 Receive control sequence (RCS)
5.6.1.1 Acknowledgement number one (ACK1) sequence
5.6.1.2 Acknowledgement number two (ACK2) sequence
5.6.1.3 Stop (STOP) sequence
5.6.1.3.1 Reply (REP) sequence received
5.6.1.4 Retransmit message (RT) sequence
5.6.2 Transmit control sequence (TCS)
5.6.2.1 Start (START) sequence
5.6.2.2 Reply (REP) sequence
5.6.2.3 Cancel (CAN) sequence
5.6.3 Reply timer
5.6.4 Response timer
5.6.5 Safe message store
5.7 Mode V operation
5.8 Mode V timing and time out
5.9 Mode V throughput calculations
5.9.1 Example
5.9.2 Tabulated transmission times
5.10 Mode V transmission efficiency
6 NOTES
6.1 Key word listing

Gives the minimum requirements necessary to implement information and record traffic exchange among data communications systems employed in long haul and tactical communications networks. It is not the intent to specify any particular hardware of software design or implementation. Message formats are not specified.

The purpose of this document is to ensure interoperability and to promote commonality of communications equipment and subsystems using Mode V channel coordination procedures.