CALCULATION THUMB RULE- SPEED
Note as well that wireless is shared environment, this means that the amount of clients connected to the AP will be sharing the effective throughput between each other. On top of that, more clients mean more contention and inevitably more collision. The effiency of the coverage cell will drastically decrease as the number of clients increase.
It is a rule of thumb:
Expected throughput = Data Rate x 0.65
In our case:
780 x 0.65 = 507
507 Mbps of throughput is what we may expect in good conditions in a lab with a single client.
Cisco Reference Document
https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/212892-802-11ac-wireless-throughput-testing-and.html
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