AirLive A.DUO - Manual (Page 69)

4. Wireless and WAN Settings
AirLive A.DUO User’s Manual 62
ECWmax: If the first random backoff time ends before successful
transmission of the data frame, the access point increases a retry counter,
and doubles the value of the random backoff window. The value specified in
the Maximum Contention Window is the upper limit for this doubling of the
random backoff. This doubling continues until either the data frame is sent or
the Maximum Contention Window size is reached.
AIFS
The Arbitration Inter-Frame Spacing (AIFs) specifies a wait time (in
milliseconds) for data frames. 802.11e uses interframe spaces to regulate
which frames get access to available channels and to coordinate wait times
for transmission of different types of data. The AIFs ensures that multiple
access points do not try sending data at the same time but instead wait until a
channel is free. Valid values for AIFs are 1 through 255.