PHYSICAL LAYER AND TRANSMISSION MEDIA
INTRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Before data can be trasmistted they must be transformed to
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Periodic signal
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electromagnetic signal
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Low frequency sine waves
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None of these
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Explanation:
Detailed explanation-1: -Sound, video and data signals are electronically digitized into a stream of on/off pulses, and converted into an equivalent electric signal. An optical transmitter takes the incoming electrical signal and converts it into an equivalent light signal.
Detailed explanation-2: -For a computer to use the data, it must be in discrete digital form. Similar to data, signals can also be in analog and digital form. To transmit data digitally, it needs to be first converted to digital form.
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