CBSE Class 12-science Answered
What is a digital signal?Write two advantages of digital communication. Give any one difference between Fax and E-mail systems of communication.
Asked by Topperlearning User | 09 Jul, 2014, 10:55: AM
Expert Answer
A digital signal is a discontinuous function of time (unlike an analog signal ) in which current or voltage takes only two discrete values.
Advantages of digital communication are as follows:
(i) This mode of communication is more reliable.
(ii) Its transmission needs simple technique.
In Fax, we get a hard copy of the message at the recipient's terminal.
In E-mail, we get a soft copy of the message at the recipient's terminal.
Answered by | 09 Jul, 2014, 12:55: PM
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