Introduction to Data Transmission in Computer Networks Data transmission is the backbone of modern computer networks. It involves sending digital or analog signals over a physical medium. This process allows devices to share information globally.
is the Signal-to-Noise Ratio. This law highlights that no matter how many signal levels you use, noise establishes an absolute ceiling on transmission speed. Transmission Media
: Guided (wired) and unguided (wireless) physical layers.
Consists of color-coded copper wires twisted together to reduce electromagnetic interference. It is standard for local area networks (LANs). Introduction to Data Transmission in Computer Networks Data
: Use the chapter-end summaries to quickly revise core definitions and formulas right before your exams.
Transmission Media | +---------------+---------------+ | | Guided (Wired) Unguided (Wireless) | | +--------+--------+ +-------+-------+ | | | | | | Twisted Coaxial Fiber Radio Micro Infrared Pair Cable Optic Waves waves Guided Media (Wired)
Data travels in one direction only (e.g., keyboard to computer). is the Signal-to-Noise Ratio
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External interference that corrupts a signal. Examples include thermal noise, induced noise, crosstalk, and impulse noise. Digital Modulation and Multiplexing Techniques
Signals traveling over a network can be either analog or digital. Choosing the right transmission method depends on the medium and the requirements of the network system. Analog Transmission Consists of color-coded copper wires twisted together to
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