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hw4_solution - 6.13 7.4 a = Propagation Delay 270 10 3 = =...

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6.13 7.4    a = Propagation Delay L R = 270 × 10 - 3 10 3 10 6 = 270 a. U = 1/(1 + 2a) = 1/541 = 0.002 b. Using Equation 7.6: U = W/(1 + 2a) = 7/541 = 0.013 c. U = 127/541 = 0.23 d. U = 255/541 = 0.47 7.5  B: Propagation time =  4000  ×  5  μ sec = 20 msec Transmission time per frame =    1000 100 × 10 3 = 10 msec The effective data rate: r1 = (3 frames)/(10 msec + 2x20 msec)    = 60 kbps  C: Propagation time =  1000  ×  5  μ sec = 5 msec
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