What is the minimum number of bits l that will be required

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Direction: Frames of 1000 bits are sent over a 10⁶ bps duplex link between two hosts. The propagation time is 25 ms. Frames are to be transmitted into this link to maximally pack them in transit (within the link).

What is the minimum number of bits l that will be required to represent the sequence numbers distinctly? Assume that no time gap need to be given between transmission of two frames.

1. I = 2
2. I = 3
3. I = 4
4. I = 5

Correct Option: D

Pulse rate =	Number of bits	=	1000	= 4 × 10⁴
	Time taken		25 × 10^-3

Now, Bit rate = Pulse rate × 2¹
2¹ = 25 ⇒ I = 5