Q2. (a) Two towns 20km apart are connected by a microwave data link. Data is sent across the link in 800 byte frames and

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Q2. (a) Two towns 20km apart are connected by a microwave data link. Data is sent across the link in 800 byte frames and

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Q2 A Two Towns 20km Apart Are Connected By A Microwave Data Link Data Is Sent Across The Link In 800 Byte Frames And 1
Q2 A Two Towns 20km Apart Are Connected By A Microwave Data Link Data Is Sent Across The Link In 800 Byte Frames And 1 (115.77 KiB) Viewed 52 times
Q2. (a) Two towns 20km apart are connected by a microwave data link. Data is sent across the link in 800 byte frames and the link operates at a data rate of 120Mbps. Assuming the link has a bit error rate of 4 x 10-5, and a velocity of propagation v = 3 x 108 m/s, determine the link utilisation efficiency using the following protocols: [6 Marks] [3 marks] a (i) Idle RQ (ii) Selective repeat RQ with a send window buffer k=2. (iii) Suggest a way to increase the link utilisation of the Selective repeat RQ scheme. Discuss potential disadvantages of such an approach. [6 Marks]
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