Abstract. The possibility to improve efficiency of data exchange over redundant channel is analyzed for the case when the channel is used for request for transmission of data packets sensitive to delay of faultless delivery to the addressee. The effectiveness of redundant transmission of packet copies over several channels is considered to allow for compromise between decrease of average time of request processing and requirements for faultless transfer for a given time for systems with excluded feasibility of repeated packet sending due to delivery time limitation. The existence of optimal multiplicity of backup copies and an area of effectiveness of redundant data transfer over an aggregate channel are demonstrated on the base of additive and multiplicative criteria.

Keywords: network, reliability, sensitivity to delay of delivery, redundant data packets, packets, aggregate channel, data transfer

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