PHYSICAL LAYER AND TRANSMISSION MEDIA
TRANSMISSION MEDIA
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Analog
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Modulated
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Demodulated
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Digital
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Detailed explanation-1: -Digital signals are transmitted to computers in the form of electronic signals sent as pulses. The digital device interprets each pulse’s voltage as either a 0 or 1. The image below is an example of a digitized wave.
Detailed explanation-2: -Digital signals can be transmitted over transmission lines using either serial or parallel communication. With serial communication, the sequence of bits used to describe a value is sent in sequence along a single transmission line.
Detailed explanation-3: -Answer: Digital signals are a more reliable form of transmitting information because an error in the amplitude or frequency value would have to be very large in order to cause a jump to a different value. Signals are composed of infinite possible values.
Detailed explanation-4: -A data bus can transfer data to and from the memory of a computer, or into or out of the central processing unit (CPU) that acts as the device’s “engine.” A data bus can also transfer information between two computers.