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Consider a 128 x 103bits/second satellite communication link with one way propagation delay of 150 milliseconds.
Selective retransmission (repeat) protocol is used on this link to send data with a frame size of 1 kilobyte. Neglect the transmission time of acknowledgement. The minimum number of bits required for the sequence number field to achieve 100% utilization is ________.
Selective retransmission (repeat) protocol is used on this link to send data with a frame size of 1 kilobyte. Neglect the transmission time of acknowledgement. The minimum number of bits required for the sequence number field to achieve 100% utilization is ________.
Correct answer is 'Answer is 4 bits.'. Can you explain this answer?
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Verified Answer
Consider a 128 x 103bits/second satellite communication link with one ...
Answer is 4 bits.
As we want 100 percent efficiency, ws=1+2a
As we want 100 percent efficiency, ws=1+2a
Available seq numbers>= ws+wrIn Selective Repeat,
ws=wr(let it be n)
2*n=2*6=12
avail seq numbers>=12
so minimum seq numbers are 12
number of bits for that is ceil of
Most Upvoted Answer
Consider a 128 x 103bits/second satellite communication link with one ...
Explanation:
Therefore, the minimum number of bits required for the sequence number field to achieve 100% utilization is 4 bits.
- The given satellite communication link has a data rate of 128 x 103 bits/second and a one-way propagation delay of 150 milliseconds.
- The frame size used is 1 kilobyte.
- The selective retransmission protocol is used in this link.
- The sequence number field is used to identify each frame.
- The goal is to achieve 100% utilization of the sequence number field.
- To achieve this, we need to calculate the maximum number of unacknowledged frames that can be in the pipeline at any given time.
- This can be calculated using the following formula:
- Substituting the given values in the formula, we get:
- Simplifying the equation, we get:
- Since we cannot have a fraction of a frame, we round up the value to 20.
- Therefore, the sequence number field must be able to uniquely identify 20 frames.
- To achieve 100% utilization of the sequence number field, the number of bits required is:
Therefore, the minimum number of bits required for the sequence number field to achieve 100% utilization is 4 bits.
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Consider a 128 x 103bits/second satellite communication link with one way propagation delay of 150 milliseconds.Selective retransmission (repeat) protocol is used on this link to send data with a frame size of 1 kilobyte. Neglect the transmission time of acknowledgement. The minimum number of bits required for the sequence number field to achieve 100% utilization is ________.Correct answer is 'Answer is 4 bits.'. Can you explain this answer?
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