Inspired by this slide, I became curious to know the (theoretical) latency of the latest WiFi standard. However Google didn't help. This ppt's 8th slide, compares latency of 802.3 (3000 microsecs) with that of 802.3ae (190 microsecs).
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In wifi, latency varies dramatically with load. 802.11 is a half-duplex medium (only one user can transmit at a time on a given channel), so as more users transmit, it's more likely that you will have to wait for a time slot. Thus there can be nospecific latency, just as there can be no specific per-user throughput.
Mel Beckman
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