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Express Learning: Data Communications and Computer Networks by ITL Education Solutions Limited

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3

Analog and Digital Transmission

1. What do you mean by data and signal?

Ans: Data refers to an entity that expresses some meaning based on rules which are agreed upon by the sender and the receiver. It can be available in various forms such as text, graphics, audio and video. Signal refers to the representation of the data in a form (such as electrical, electronic or optical) suitable for transmission over a transmission medium.

2. Define analog and digital data.

Ans: Analog data is defined as the data having continuous states. For example, sounds produced while speaking take continuous values. Digital data is defined as the data having discrete states. For example, data to be stored in the memory of computer is in the form of 0s and 1s. ...

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