FIELD: radio engineering. SUBSTANCE: system for transmission of communication information over communication channel changing in time includes useful information called teaching information that is subject to transmission. It enables specified transmission channel to be evaluated. System has facilities evaluating necessity of transmission of teaching information from point of view of change of specified transmission channels and facilities transmitting teaching information if necessity of transmission of teaching information is recognized. EFFECT: improved functional reliability of system. 16 cl, 3 dwg
