MIL-STD-187-721 Interoperability And Performance Standard For Advanced Adaptive Hf RadioThe purpose of this document is to describe the technical parameters for adaptive high frequency HF radio that are more advanced than those described in MIL-STD-188-141. The advanced technology contained in this standard will guide the planning of military adaptive HF radio network technology into the 21st century. To fully understand and utilize this document, it is necessary to refer to portions of MIL-STD-188-141.

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MIL-STD-187-721D

5.6.4.4 Data port selection................................................................................................42

5.6.4.5 Digital LINCOMPEX zeroization. ........................................................................43

5.6.4.6 Digital squelch. .....................................................................................................43

5.6.5 Power control..............................................................................................................44

5.6.6 Scheduling functions....................................................................................................44

5.6.6.1 Adjust slot width...................................................................................................46

5.6.6.2 Station busy. .........................................................................................................46

5.6.6.3 Channel busy.........................................................................................................46

5.6.6.4 Set dwell time. ......................................................................................................46

5.6.6.5 Halt and wait. .......................................................................................................46

5.6.6.6 Contact later. ........................................................................................................46

5.6.6.7 Meet me................................................................................................................46

5.6.6.8 Poll operator (default NAK)..................................................................................47

5.6.6.9 Request operator ACK..........................................................................................47

5.6.6.10 Schedule periodic function. .................................................................................47

5.6.6.11 Quiet Contact......................................................................................................47

5.6.6.12 Respond and wait................................................................................................47

5.6.6.13 Set sounding interval...........................................................................................48

5.6.6.14 Tune and wait. ....................................................................................................48

5.6.6.15 Set slot width......................................................................................................48

5.6.6.16 Year and date......................................................................................................48

5.6.6.17 Zulu time. ...........................................................................................................49

5.6.6.18 Do not respond. ..................................................................................................49

5.7 Networking functions. ........................................................................................................49

5.8 Network management.........................................................................................................49

5.9 Multimedia operation..........................................................................................................49

5.10 HFNC interface to local equipment (station data bus). ......................................................49

5.11 Automatic link maintenance protocol................................................................................49

5.11.1 Control frame CMDs for link maintenance. ................................................................50

5.11.1.1 HFDLP ALM No Operational (No Op) CMD. ....................................................51

5.11.1.2 HFDLP ALM Preferred Channels CMD..............................................................51

5.11.1.3 HFDLP ALM assign frequency CMD..................................................................51

5.11.1.4 HFDLP ALM change frequency CMD. ...............................................................52

5.11.1.5 HFDLP ALM adjust power CMD. ......................................................................52

5.11.2 Data frame CMDs for link maintenance......................................................................53

5.11.3 Initiation of ALM operation.......................................................................................53

5.11.4 Alternate frequency negotiation..................................................................................53

5.11.5 Automatic power control. ..........................................................................................53

5.12 Advanced third-generation automatic link establishment....................................................53

5.13 System parameters by address...........................................................................................54

5.13.1 Multiple frequency set operation. ...............................................................................54

5.13.2 Antenna selection.......................................................................................................54

5.13.3 Power selected by net authorization. ..........................................................................54

5.14 HF mail transfer protocol (HMTP). ..................................................................................54

5.15 Automatic location report CMD. ......................................................................................54