Parallel transmission

Introduction Data into a computer (via a keyboard) is encoded by the electronics within the keyboard into an equivalent binary-coded pattern using standard coding schemes: Two most common schemes: EBCDIC (Extended Binary Coded Decimal Interchange Code): 8-bit code ASCII ((American Standards Committee for Information Interchange): 7-bit code

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Networks must be able to transfer data from one device to another with complete accuracy. Data can be corrupted during transmission. For reliable communication, errors must be detected and corrected.Single bit errors are the least likely type of errors in serial data transmission because the noise must have a very short duration which is very rare. However this kind of errors can happen in parallel transmission.

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THE TELEVISION TRANSMITTER The transmission of video images depends on a scanning device that can break up the image into a grid and measure the brightness of each element of the grid. This information can be sent serially or in parallel to a distant point and used to reproduce the image. It is evident that the smaller the size of the grid element, the better the definition of the image. One of the simplest devices which can measure the brightness of light is the phototube

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