Data transmission is the physical transfer of data (a digital bitstream) over a point-to-point or point-to-multipoint communication channel. Understanding how data moves from source to destination requires analyzing the fundamental characteristics of signals and media. :
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Data flow across a network link is categorized by its directionality. Katre highlights three distinct transmission modes: Simplex Mode Data transmission is the physical transfer of data
with other popular networking books (like Forouzan) Data transmission is the physical transfer of data