What is the data transfer rate when we transfer 25 eight bit data information characters, it stuffed 5 eight bit characters in synchronous serial transfer. The bandwidth of the given medium is 1 Kbps.
(A) 25 character / seconds
(B) 125 characters / seconds
(C) 100 character / seconds
(D) None of these.


Answer: (C)

Explanation: Bandwidth is 1 Kbps, i.e., 1000 bits per seconds.
In 25 characters 5 characters are stuffed, i.e., 40 bits in 200 bits
So, for 1000 bits 200 bits will be stuffed.

The data rate at receiver\’s end
= (Original bandwidth – stuffed data)
= 1000 – 200
= 800 bits per seconds.
= 100 character / seconds

So, option (C) is correct.

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