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$15$

$(4)$ Figure Q$4$ shows a block diagram of digital system that is used to convert parallel data to serial data.

$[20$ Marks$]$

a$)$ List three differences between parallel and serial transmission of the data.

b$)$ Explain the operation of this system below in detail.

c$)$ What is the frequency of the output data?

d$)$ How long it is required to send one input data frame $(8-$bits$)?$

Figure $Q4$