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The number of packets that were dropped while being received,
due to errors, collisions, or Access Point resource limitations.
Collisions
The number of packets that were dropped due to Ethernet
collisions (two or more devices attempting to use an Ethernet
circuit at the same time).
Errors
The number of transmission failures that cause loss of a packet. A
noisy radio-frequency environment can cause a high error rate on
the wireless LAN.
