Throughput analysis (Release after transmission) Suppose each node transmits one packet and then releases the token to the next node Vi=propagation and transmission time for token between two nodes (transmission time is usually negligible) The amount of time to transmit n packets N=NE冈+v1+V2+…tVN=NE凶Q]+N"E λ<NEⅨ](NE[+N"E)=1(1+EE]) Compare to CSMA/CD, but notice that v is the delay between two nodes and not the maximum delay on the fiber Slide 12λ Throughput analysis (Release after transmission) • Suppose each node transmits one packet and then releases the token to the next node – Vi = propagation and transmission time for token between two nodes (transmission time is usually negligible) • The amount of time to transmit N packets TN = N*E[X] + V1 + V2 +…+ VN = N*E[X] + N*E[V] λ < N*E[X]/(N*E[X] + N*E[V]) = 1/(1+E[V]/E[X]) • Compare to CSMA/CD, but notice that V is the delay between two nodes and not the maximum delay on the fiber Eytan Modiano Slide 12