FIELD: electric communications; adaptive data transmission systems for status control of digital communication channels. SUBSTANCE: device that has reset signal sensor, series-connected matching unit whose input functions as device input, error detection unit, and single error counter is provided, in addition, with register, two delay circuits, storage unit, adder, subtraction unit, two code comparison units, two inverters, two AND gates, OR gate, two flip-flops, and additional connections. Device functions to estimate channel status using method of confidence intervals which provides for higher confidence compared with point estimate and faster detection of moment when channel status changes. EFFECT: reduced delay in determining moment of change in channel status. 4 dwg
