# hw4 - Zhou HuanXian(ID 0225418 HW4 EE136 Instructor Kang Xi...

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Zhou, HuanXian (ID: 0225418) HW4 EE136 Instructor: Kang Xi 6.13) For P = 110011 and M = 11100011, find the CRC. 10110110 110011 / 1 ̅ ̅ 110001100000 ̅ ̅ ̅ ̅ ̅ ̅ ̅ ̅ ̅ ̅ ̅ ̅ 110011 101111 110011 111000 110011 101100 110011 111110 110011 CRC = 11010 7.4) Consider the use of 1000-bit frames on a 1-Mbps satellite channel with a 270-ms delay. What is the maximum link utilization for a. Stop-and-wait flow control? b. Continuous flow control with a window size of 7? c. Continuous flow control with a window size of 127? d. Continuous flow control with a window size of 255? Tprop = 270x10^-3 sec Tframe = 1000 bit / 10^6 bit/sec = 10^-3 sec a = Tprop / Tframe = 270x10^-3 / 10^-3 = 270 a. U = 1 / (1+2a) = 1/(1+2*270) = 1/541 = 0.002 b. U = W/(1+2a) = 7/(1+2*270) = 7/541 = 0.013 c. U = 127 / 541 = 0.23 d. U= 255 / 541 = 0.47 7.5) In Figure 7.10, frames are generated at node A and sent to node C through node B. Determine the minimum transmission rate required between nodes B and C so that the buffers

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## This note was uploaded on 11/02/2010 for the course EE 136 taught by Professor Kang xi during the Spring '10 term at NYU Poly.

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hw4 - Zhou HuanXian(ID 0225418 HW4 EE136 Instructor Kang Xi...

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