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

FIGURE 22.  Year and date CMD.

5.6.6.17  Zulu time.

This CMD may be used to request and report Zulu time.  If the third character position on figure

23 is set to all 1's, the CMD is a request for Zulu time, and shall not be followed by a DATA word.  If the third character position contains a 7-bit integer in the range 0-119, this CMD and a following DATA word (formatted in accordance with figure 20) report the date and zulu time

with a resolution of 500ms.  Other values in the third character position are reserved, and shall not be used until standardized.

FIGURE 23.  Zulu time CMD.

5.6.6.18  Do not respond. See MIL-STD-188-141.

5.7  Networking functions. See MIL-STD-188-141.

5.8  Network management. See MIL-STD-188-141.

5.9  Multimedia operation. See MIL-STD-188-141.

5.10  HFNC interface to local equipment (station data bus). See MIL-STD-188-141.

5.11  Automatic link maintenance protocol.

The HF Data Link Protocol (HFDLP) of MIL-STD-188-110 shall be extended as follows to support ALM.

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