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Synchronous And Synchronous Communication Asynchronous Communication With asynchronous communication characters are sent one at a time and receiving end does not know when the next character will be sent until the arrival of the start bit. There is no timing information sent within the data. A signal 7-bit ASCII character, along with its start, stop and parity bits, requires 10 bits. An important point with asynchronous transmission is the amount of overhead that is required to send data. With asynchronous transmission each 8-bit ASCII character (7 bits plus the parity bit) requires 2 extra bits (the start and stop bits) to be transmitted; this represents a 20 per cent overhead, i.e. an efficiency of 80 per cent. To improve the efficiency of the data communication system, we need to keep this overhead to a minimum, because any overhead is wasted data that lowers the effective data transmission rate. Asynchronous data transmission is...

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