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Table 1 Parameters for 802.11b basic mode

From: Maximizing the stable throughput of high-priority traffic for wireless cyber-physical systems

SIFS 10 μs IP = 40 bytes
Slot 20 ms MAC = 30 bytes
DIFS 50 μs T ack = (PHY + 14) × 8/ R basic
R data 11 Mbps T data(L) = PHY × 8/ R basic + (IP + MAC + L) × 8/ R data
R basic 1 Mbps T pkt(L) = DIFS + T data(L) + SIFS +T ack
PHY 24 bytes