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date: 10 December 2023


A Dictionary of Weights, Measures, and Units

Donald Fenna

[J. M. E. Baudot; France 1845–1903]electromagnetics, informatics. In telegraphy and other digital signalling, the time between representative samplings of the signal, during which any transition of signal state occurs, for example a hundredth of a second. A transmission line with such a rate of transition/reading would invariably be called a ‘100-baud’ line; in such an expression the baud becomes a rate rather than the original time element. Since virtually all telegraphy and most similar transmission until recently used only two levels for transition, each baud accommodated just 1 bit; hence a 100-baud line was often referred to as being of 100 bits per second. In reality, most lines of such magnitude dissipate from 10 to over 30% of their capacity on asynchronous signal control, so the translation to bits is quite exaggerated to the user. Modern high-speed circuits dissipate very little, so the nominal figure is not significantly misleading; however, its transition/reading scheme may be very different, with perhaps eight levels communicating three bits per baud on a ‘4 800-baud’ line (i.e. sampled every ... ...

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