FIELD: electric communications. SUBSTANCE: system has on sending end transformers, flip- flops, AND gate, OR gate, clock frequency discriminator, pulse shaper, counter-divider, NOT gate; on receiving end it has computing unit, shift registers. flip-flops, AND gate, keys, transformer, clock frequency discriminator, pulse shaper, and counter-divider. EFFECT: improved validity of secondary data flow reception and transmission. 4 dwg
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