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

4.15  Automatic location feature................................................................................................15

4.15.1  Automatic reporting...................................................................................................15

4.15.2  Disable capability.......................................................................................................15

4.15.3  Secure transmission. ..................................................................................................15

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

5.1  Linking protection. .............................................................................................................16

5.2  Time exchange protocols....................................................................................................16

5.3  Channel and frequency designators. ....................................................................................16

5.4  Link quality functions. ........................................................................................................16

5.4.1  LQA matrix. ................................................................................................................16

5.4.2  Sounding. ....................................................................................................................16

5.4.2.1  Sounding intervals.................................................................................................16

5.4.2.2  Local noise report. ................................................................................................17

5.4.3  Polling protocols..........................................................................................................17

5.4.3.1  Individual poll:  two stations, one channel. ............................................................17

5.4.3.2  Multiple station - single channel polling.................................................................17

5.4.3.2.1  Hub net poll. .....................................................................................................17

5.4.3.2.2  Full net poll.......................................................................................................18

5.4.3.2.3  Hub group poll..................................................................................................19

5.4.3.2.4  Full group poll. .................................................................................................19

5.4.3.3  Two station - multiple channel polling...................................................................20

5.4.4  LQA report protocol....................................................................................................22

5.5  Advanced link quality analysis.............................................................................................26

5.5.1  Channel quality measures.............................................................................................27

5.5.1.1  SINAD and PBER. ...............................................................................................27

5.5.1.2  Articulation index..................................................................................................27

5.5.1.3  Spectral distortion.................................................................................................29

5.5.1.4  Error-free interval. ................................................................................................31

5.5.2  Link performance measures..........................................................................................33

5.5.2.1  Achievable voice quality........................................................................................33

5.5.2.2  Available data capacity..........................................................................................33

5.5.3  ALQA reporting protocol. ...........................................................................................35

5.5.3.1  ALQA command word..........................................................................................35

5.5.3.2  Channel quality measure request............................................................................36

5.5.3.3  Link performance measure request. .......................................................................38

5.5.3.4  Channel quality measure reports............................................................................38

5.5.3.5  Link performance measure reports. .......................................................................40

5.6  Additional orderwire functions............................................................................................41

5.6.1  Version CMD. .............................................................................................................41

5.6.2  Capabilities function.....................................................................................................41

5.6.3  Frequency select CMD.................................................................................................41

5.6.4  Mode control...............................................................................................................41

5.6.4.1  Modem negotiation and handoff............................................................................41

5.6.4.2  Crypto negotiation and handoff. ............................................................................41

5.6.4.3  Analog port selection. ...........................................................................................41

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