FIELD: radio engineering, cable television. SUBSTANCE: known device ( US Pattern No 4651204 ) is supplemented with modulation unit which output is connected to one of inputs of code former, output of modulation units is connected to noise generator and shift generator which output is connected to one of inputs of mixer. One input of mixer is connected to output of proposed device and other input of mixer is connected to shift generator, output of mixer is connected to input of transmission filter and output of filter - to input of proposed device. EFFECT: increased reliability of protection against unauthorized access of subscriber thanks to transmission of additional noise signal and signal of backward channel from subscriber. 1 dwg
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