FIELD: communication equipment.
SUBSTANCE: invention relates to communication technology and can be used to ensure information security of negotiations in designated areas from the threat of leakage of acoustic (voice) information through fiber-optic communications. In the method of detecting the acousto-optic fiber channel, the leakage of speech information through optical fibers of cable lines and the protection against leakage of voice information through optical fibers in the optical fiber register all light fluxes and analyze the possibility of eavesdropping, herewith, one of the signs of leakage of acoustic (speech) information is the presence in the optical radiation propagating through the optical fiber of copies of signals with a delay of more than 50 mcs, and upon detection of copies, they are removed.
EFFECT: technical result is to increase the protect confidential voice information.
1 cl, 1 dwg
