PHYSICAL LAYER AND TRANSMISSION MEDIA
DIGITAL TRANSMISSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Signal element ; data element
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Data element ; signal element
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Either A or B
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None of the above
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Detailed explanation-1: -A data element is the smallest entity that can represent a piece of information (a bit). A signal element is the shortest unit of a digital signal. Data elements are what we need to send; signal elements are what we can send. Data elements are being carried; signal elements are the carriers.
Detailed explanation-2: -In short, data has to be interpreted, managed or converted by software instructions so that it becomes information. Electronic transmissions have to be encoded into a language that can be transmitted. Signals are the electric or electromagnetic impulses used to encode and transmit data.
Detailed explanation-3: -Line coding is the process of converting digital data to digital signals. We assume that data, in the form of text, numbers, graphical images, audio, or video, are stored in computer memory as sequences of bits. Line coding converts a sequence of bits to a digital signal.