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Second-generation HF automation (e.g., MIL-STD-188- 141A) provided a sufficiently robust, reliable, and interoperable link establishment technology to produce a resurgence of interest in HF radio for long-haul and mobile voice networks beginning in the 1980s. With the addition of a robust data link protocol, the second generation technology was extended to support data applications over HF. By the mid-1990's, however, the growth of HF networking revealed the need for techniques that reduce overhead traffic so that the limited HF spectrum could support larger networks and more data traffic.
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