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

this process, another message has joined the waiting queue; it contains 120 characters, so Lf = 7 (480 + 120) = 4200. For this example,

R 2100

100

21 b I s

u 4200 3360

2100

x 21(1 0.40)

0.40

12.6 b I s

5.5.3 ALQA reporting protocol.

The following ALQA orderwire protocol shall be used to request and to report channel quality measure and link performance measure data. ALQA reports shall convey historical data

(including measurements of the ALQA request itself) for all channels common to the parties to the exchange. (This protocol is similar to the LQA report protocol described in 5.4.4.)

5.5.3.1 ALQA command word.

The ALQA command word (shown on figures 10 through 13 and 15) shall be used both to

request and to report ALQA measurements. All instances of the ALQA CMD contain Epoch and Control fields. In requests, the Epoch field shall specify the desired timeliness of data, while in a report, the Epoch field shall indicate the epoch actually used (see table XIII). (Note that the Epoch field in a report need not have the same value as in the request.)

TABLE XIII. Epoch field encoding.

The Control field shall describe the format of the reports requested or delivered in accordance with table XIV. The reporting station should always comply with the reporting format requested unless it is not equipped to do so. All implementations of ALQA reporting shall support the minimum interoperability format which corresponds to all control bits set to 0 (i.e., reports in DTM messages containing data only and using default thresholds, as described later).