ASYNCHRONOUS DATA TRANSMISSION METHOD

摘要

PURPOSE:To eliminate the deviation of the phase of clock between a sender side MODEM and a sender side TDM (multiplexer) by resetting a data buffer when the start of an asynchronous data is detected. CONSTITUTION:An FIFO control circuit 8 sends an FIFO output clock 11 to an FIFO buffer 9 in matching with a high speed clock 6 after data of a prescribed number relating to a preceding burst number are stored in the FIFO buffer 9 so that the data in the FIFO buffer 9 are not lost from the start of transmission of a facsimile data till its end. A dummy data is sent for a while after the end of the facsimile data, but since the FIFO buffer 9 is again reset at the start of the facsimile data, the dummy data in the FIFO buffer 9 is lost. The loss of the dummy data is allowed and the synchronization is taken at the start of the succeeding facsimile data regardless of lead or lag and the phase deviation is avoided.