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: (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.

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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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 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 10$ m/s, determine the link utilisation efficiency using
the following protocols:
(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.
Transcribed Image Text: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 10$ m/s, determine the link utilisation efficiency using the following protocols: (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.
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