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Data transmission is the transfer of data from point-to-point often represented as an electro-magnetic signal over a physical point-to-point or point-to-multipoint communication channel. Examples of such channels are copper wires, optical fibers, wireless communication channels, and storage media. Although data transferred may be exclusively analog signals, in modern times, transferred data is most often be a digital bit stream that may origin from a digital information source[citation needed] , for example a computer or a keyboard, or from a digitized analog signal, for example an audio or video signal. Data transmitted may be analog or digital (i.e. digital bit stream) and modulated by means of either analog modulation or digital modulation using line coding. The concept of digital communication is typically associated with digital representation of analogue signals, including source coding and Pulse-code modulation, but that may also be covered in a textbook on data transmission. Data transmission is a subset of the field of data communications, which also includes computer networking or computer communication applications and networking protocols, for example routing, switching and process-to-process communication. Courses and textbooks in the field of data transmission[1] as well as digital transmission[2] and digital communications [3] typically deal with the following protocol layers and topics
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