Edimax EW-7476HPC User Manual page 72

CWMin
CWMax
AIFSN
TxOP
70
Minimum Contention Window (milliseconds):
This value is input to the initial random
backoff wait time algorithm for retry of a data
frame transmission. The backoff wait time will
be generated between 0 and this value. If the
frame is not sent, the random backoff value is
doubled until the value reaches the number
defined by CWMax (below). The CWMin value
must be lower than the CWMax value. The
contention window scheme helps to avoid
frame collisions and determine priority of
frame transmission. A shorter window has a
higher probability (priority) of transmission.
Maximum Contention Window (milliseconds):
This value is the upper limit to random
backoff value doubling (see above).
Arbitration Inter‐Frame Space (milliseconds):
Specifies additional time between when a
channel goes idle and the AP/client sends
data frames. Traffic with a lower AIFSN value
has a higher priority.
Transmission Opportunity (milliseconds): The
maximum interval of time an AP/client can
transmit. This makes channel access more
efficiently prioritized. A value of 0 means only
one frame per transmission. A greater value
effects higher priority.