FIELD: information technologies.
SUBSTANCE: signal of additional data, which is identified during reception by a correlation method, is compared with a signal of additional data separated from a signal of useful data and a signal of an error of a receiving optical module, in case signals of additional data identified with independent methods differ, a negative acknowledgement command is generated, using which a signal of negative acknowledgement is generated and transferred, at the same time a signal of additional data, which is transferred, is an identification code consisting of several bits, which carries information on necessity of repeating the previous unit of additional data, or on increase/decrease of additional data transfer speed.
EFFECT: provision of additional information transfer with alternating speed and with specified validity.
5 dwg, 1 tbl
