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-DJ Craig
AnswerMedia used for communications:- recorded media (books, newspapers, CD ROMS, memory sticks, etc) physically delivered from transmitter to receiver and decoded visually, mechanically, magnetically or electronically;
- air and other fluids (sound or pressure waves, light, IR, RF, often modulated)
- solids (mechanical motion or vibration, electrical signals, magnetic tapes and disks, visible light in glass)
- vacuum (RF, visible light)
guided and unguided
guided communication media includes :-Twisted pair ,fiber optic ,coaxial cabel
unguided media includes: antenna ,Broad cast radio
AnswerCommunication media (also called transmission media or communication channels) may be wired or wireless.
Wired media include copper cables (e.g., twisted-pair copper wire cable - the "telephone cable", coaxial cable, UTP cable - the "LAN cable", etc.) and optical fiber cables (made of glass or plastic). Copper cables allow the propagation of electric signals (i.e., electric voltage or current pulses), whereas optical fiber cables allow the propagation of light pulses.
Wireless media include the free space, the ionsphere, etc. Wireless media allow the propagation of electromagnetic waves. The transmission/reception of electromagnetic waves requires the use of some wireless link(also called radio link, due to the fact that radio broadcast was one the first commercial wireless communication system in use), such as terrestrial microwave links, satellite links, etc.
Other types of channels include storage media (e.g., hard disks, cd, dvd, etc.) and underwater acoustic channels(which allow the propagation of sound waves).
Communication channels vary in capacity (i.e., the amount of information per time unit that can be carried in a reliable fashion), attenuation (i.e., reducing of transmitted signal's strength; attenuation increases with the channel length), distortion (i.e., alternation of signal's variation pattern, where is impressed the information), noise (i.e., random unwanted signals that corrupt the signal shape), etc.
Kotsos
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