CSMA Let t s the maximum propagation delay on the channel When a node starts/stops transmitting, it will take this long for all nodes to detect channel busy/idle For initial understanding, view the system as slotted with mini- slots"of duration equal to the maximum propagation delay Normalize the mini-slot duration to p=t/Dtp and packet duration= 1 <---11 packet minislots Actual systems are not slotted, but this hypothetical system simplifies the analysis and understanding of CSMACSMA • Let τ = the maximum propagation delay on the channel – When a node starts/stops transmitting, it will take this long for all nodes to detect channel busy/idle • For initial understanding, view the system as slotted with "mini￾slots" of duration equal to the maximum propagation delay – Normalize the mini-slot duration to β = τ/Dtp and packet duration = 1 −> β packet minislots <− <----------- 1 ----------------> • Actual systems are not slotted, but this hypothetical system simplifies the analysis and understanding of CSMA Eytan Modiano Slide 3