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Definition of "Asynchronous Transmission" |
Data transmission that does not pass clocking information to align the data; Parallel Information is synchronized individually [per transfer] by hand-shaking as in DAV [Data Available] and DAC [Data Accepted], or REQ and ACK lines. Serial Information is synchronized individually [per block] via 'START' and 'STOP' bits. Information is passed between nodes with out a separate clock signal to indicate when data on the transmission line is valid. / In telecommunications, Asynchronous transmission is transmission of data, generally without the use of an external clock signal, where data can be transmitted intermittently rather than in a steady stream. Any timing required to recover data from the communication symbols is encoded within the symbols. A notable exception is the RS-232 port, and some derivatives, which are asynchronous, but still have an external clock signal available, although not commonly used. The most significant aspect of Asynchronous transmission is that data is not transmitted at regular intervals, thus making possible variable bit rate, and that the transmitter and receiver clock generators do not have to be exactly synchronized all the time. |
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