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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


Functions: NETWORK                                                     Route Selection LAYER                                                            Linking Selection

Connectivity Tracking Connectivity Exchange Message Passing (Traffic)


DATA LINK LAYER


PHYSICAL                          Data Modem                                  ALE Modem

LAYER

Transceiver


Functional hierarchy of an automated HF station.


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