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

3 7 2 5 2 1 4
CMD	1100000 ("'": ALQA)	01	Control	Epoch	D	LPM Report

FIGURE 15. ALQA link performance measure report CMD format.

5.6 Additional orderwire functions.

A variety of orderwire functions in addition to those in MIL-STD-188-141 are described in the following paragraphs. Some are required for support of linking protection, networking, and other functions described in other portions of this standard. The remainder are provided to simplify and to add capabilities to the operation of automated HF radio networks.

5.6.1 Version CMD.

See MIL-STD-188-141.

5.6.2 Capabilities function. See MIL-STD-188-141.

5.6.3 Frequency select CMD. See MIL-STD-188-141.

5.6.4 Mode control.

Many of the advanced features of an ALE controller are "modal" in the sense that when a particular option setting is selected, that selection remains in effect until changed or reset by some protocol event. The mode control CMD is used to select many of these operating modes.

5.6.4.1 Modem negotiation and handoff. See MIL-STD-188-141.

5.6.4.2 Crypto negotiation and handoff. See MIL-STD-188-141.

5.6.4.3 Analog port selection.

The analog port selection command is used to individually enable and disable audio inputs and outputs at a station. The analog port selection CMD word shall be formatted as shown in figure

16. The bits of the analog port field in the CMD are assigned as indicated in table XVII. A bit set to 1 shall enable the corresponding analog port; a bit set to 0 shall disable the corresponding

analog port. The analog ports controlled by the standardized bits shall be those of the radio that