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

The channel quality measure report CMD (figure 13) shall precede channel quality measure reports. The Control field shall specify the format of the reports that follow this CMD word (until any following ALQA report CMD word, if any), and the Epoch field shall indicate the epoch of data used for all reports that follow. The Channels field shall contain a binary count of the

number of reports that follow this CMD word.

3 7 2 5 2 5
CMD	1100000 ("'":ALQA)	00	Control	Epoch	Channels

FIGURE 13. Channel quality measure report CMD format.

Channel quality measure reports shall be formatted as illustrated on figure 14, except that channel quality measure fields not requested shall not be present in the reports. Each channel quality measure field is 4 bits, and carries the code from table XVI corresponding to:

a. The percentage of samples of the channel quality measure from the epoch in use that equaled or exceeded the threshold used for that channel quality measure (for SINAD, Pc, articulation index, or spectral distortion), or

b. The estimated error-free interval.