The development of 802.11 standard wireless monochannel bandwidth mathematical model in the conditions of bit error rate action is carried out. The model considers the mechanism of corrupted frames retransmissions with dynamically changing the value of the waiting period for a release of the communication channel (Back of Period). A series ofbandwidth measurement experiments in wireless network based on the access point is carried out. On the basis of the received data the analysis of the developed model accuracy was done. It is shown that the accuracy of the model does not exceed 5% for all valid range of transmitted frame changes. Using the developed model various operation modes of the wireless channel was studied. It is shown that in basic operation mode of 802.11 communication channel at the level of bit errors larger than 10-5 there is always would be an optimal frame size value, which provides the maximum throughput of a wireless network. Similar research was carried out for high-speed communication channel modes Fast Frames and Frame Concatenation, which use the increased frame size up to 4000 bytes. It is shown that at the level of bit errors greater than 10-6 the maximum bandwidth is guaranteed if the frame size is smaller than 4000 bytes. Mathematical model of wireless link bandwidth in the conditions of bit error rate action may be used on the fields of design and traffic management of 802.11 standard wireless networks.