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Computer Science Engineering & Technology Software engineering Problem IV [30 marks] Given: Full duplex (FDX) communication channels between nodes A and B Full duplex (FDX) communication channels between nodes B... Share Question

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Problem IV [30 marks] Given: Full duplex (FDX) communication channels between nodes A and B Full duplex (FDX) communication channels between nodes B and C Full duplex (FDX) communication channels betw... een nodes C and D . Data-Rate between Node A and Node B, R_AB = 10 Mbps All I-frames are 250 bytes (flag to flag); All ACK frames (separate supervisory frames) are 12 bytes (flag to flag). Propagation delay is 5 microseconds/kilometer. Distances: A to B = 7500 km; B to C = 200 km; C to D = 100 km There are no errors, P.f = 0. The question: Determine the minimum Data-Rates between Node B and Node C and between Node C and Node D, that is, find R_BC and R_CD such that the buffers of Node B and Node C are not flooded for the following condition. The Hint: In order not to flood the buffers of a Node X, the average number of frames entering and leaving Node X must be the same of a long interval of time. A-B Sliding-window protocol, (Selective-Reject), between Node A and Node B with a 4-bit sequence field, max window = 6 frames. B-C Sliding-window protocol, (Selective-Reject), between Node B and Node C with a 3-bit sequence field, max window = 2 frames. C-D Stop & Wait protocol between Node C and Node D with a 1-bit sequence field, max window = 1 frame. 7500 km 200 km 100 km A B C D [Show More]

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