A data transmission method and apparatus

Embodiments of the present invention discloses a data transmission method used when the full bandwidth of the transmission channel fails, adaptive adjustment in accordance with the full bandwidth case where the transmission channel data unit transmission. If the number of full bandwidth of the transmission channel full bandwidth full bandwidth transmission channel fault, and the fault occurs is less than or equal to the M, the fault is not; the full bandwidth of the transmission channel detection bus: Example embodiments of the present invention comprises transmission channel selecting N full-bandwidth transmission channels for data transmission unit; and if the full bandwidth of the transmission path fails, the number of full bandwidth of the transmission channel and a failure is greater than the M, the full bandwidth of the transmission according to the fault has not occurred certain number of beats and the number of channels on the size of data unit reconfiguration.