Analysis of CSMA/CD, continued Let s average amount of time between successful packet transmissions s=(e-1)2τ+D+t t Ave time until start of next Mini-slot dle/collision Mini-slots Packet transmission time Efficiency =D /S= Dn / D +t+ 2i(e-1) °Let阝=tDn=> Efficiency=1(1+445)=≤11t24) Eytan Modianoτ τ τ τ β τ ≈ β λ β Analysis of CSMA/CD, continued • Let S = Average amount of time between successful packet transmissions S = (e-1)2τ + DTp + τ Ave time until start of next Mini-slot Idle/collision Mini-slots Packet transmission time • Efficiency = DTp/S = DTp / (DTp + τ + 2τ(e-1)) • Let β = τ/ DTp => Efficiency ≈ 1/(1+4.4β) = λ < 1/(1+4.4β) Eytan Modiano Slide 7