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

TABLE XVI. Quantization of channel quality measure thresholds, error-free interval reports, and exceedance percentages.

Code	SINAD (dB)	Pc = 1 - PBER	AI	SD	EFI	AVQ (dB)	ADC	Percent
0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110	2 4 6 8 10 12 14* 16 18 20 22 24 26 28 30	0.700 0.725 0.750 0.775 0.800 0.825 0.850* 0.875 0.900 0.925 0.950 0.975 0.985 0.993 0.999	0.01 0.05 0.09 0.13 0.19 0.26 0.33* 0.40 0.47 0.53 0.60 0.67 0.73 0.80 0.90	0 1 2 3 4 5 6* - - - - - - - -	1 2 5 10 20 50 100 200 500 1,000 2,000 5,000 10,000 20,000 50,000	2 4 6 8 10 12 14* 16 18 20 22 24 26 28 30	1 2 3 4 5 8 15* 25 50 100 200 400 800 1600 3200	0 5 10 20 30 40 50 60 70 80 85 90 95 97 99
1111	use de- fault	use default	use de- fault	use de- fault	no report	use de- fault	use de- fault	no report
* indicates default

5.5.3.3 Link performance measure request.

Link performance measure requests shall use the link performance measure request CMD word as shown on figure 12. The Control and Epoch fields shall be encoded as described above, except that KL 2-4 shall be set to 0 (channels are irrelevant to link performance measure reports). The D bit shall be set to 1 to request a data link performance measure report, or to 0 to request a voice link performance measure report. The link performance measure Threshold field shall contain the threshold for the selected link performance measure, encoded in accordance with table XVI. (If both voice and data link performance measure reports are desired, two link performance measure request CMDs shall be sent.)

3 7 2 5 2 1 4
CMD	1100000 (''':ALQA)	11	Control	Epoch	D	LPM Threshold

FIGURE 12. ALQA link performance measure request CMD format.

5.5.3.4 Channel quality measure reports.