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Data transmission - Wikipedia, the free encyclopedia
Data transmission , digital transmission or digital communications is the physical transfer of data (a digital bit stream) over a point-to-point or point-to-multipoint transmission medium. Exampl...
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Comparison of synchronous and asynchronous signalling - Wikipedia, the free encyclopedia
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If the duration of a single bit is T seconds, the length of a character is given by start bit plus seven data bits plus the parity bit plus the stop bit = 10T. Asynchronous transmission is clearly inefficient, since it requires ten data bits to transmit seven bits of useful information.
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Asynchronous transmission is used commonly for communications over telephone lines, whereas most network protocols (such as Ethernet, SONET, Token Ring) use synchronous transmission ... asynchronous transmission in the news...
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Associated with the approach of asynchronous transmission are various advantages. ... As with asynchronous transmission it is apparent that the synchronous approach offers advantages. ... On the other hand, an asynchronous transmission system has extensive disadvantages.
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A second concern is that because asynchronous transmission introduces additional message passing overhead into the transmission mechanism, the speed of asynchronous transmission will tend to be slower than that of synchronous data transfer.
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