D-Link DWC-1000 User Manual page 87

Wireless Controller
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AIFS (Inter-Frame Space): The Arbitration Inter-Frame Spacing (AIFS)
specifies a wait time for dataframes. The wait time is measured in slots. Valid
values for AIFS are 1 through 255.
cwMin (Minimum Contention Window): This parameter is input to the
algorithm that determines the initial random backoff wait time (window) for
retry of a transmission. The value specified here in the Minimum Contention
Window is the upper limit (in milliseconds) of a range from which the initial
random backoff wait time is determined. The first random number generated
will be a number between 0 and the number specified here. If the first random
backoff wait time expires before the data frame is sent, a retry counter is
incremented and the random backoff value (window) is doubled. Doubling
will continue until the size of the random backoff value reaches the number
defined in the Maximum Contention Window. Valid values for the cwmin are
1, 3, 7, 15, 31, 63, 127, 255, 511, or 1024. The value for cwmin must be lower
than the value for cwmax.
cwMax (Maximum Contention Window): The value specified here in the
Maximum Contention Window is the upper limit (in milliseconds) for the
doubling of the random backoff value. This doubling continues until either
the data frame is sent or the Maximum Contention Window size is reached.
Once the Maximum Contention Window size is reached, retries will continue
until a maximum number of retries allowed is reached. Valid values for the
cwmax are 1, 3, 7, 15, 31, 63, 127, 255, 511, or 1024. The
value for cwmax must be higher than the value for cwmin.
Max. Burst Length: AP EDCA Parameter Only (The Max. Burst Length
applies only to traffic flowing from the access point to the client station.) This
value specifies (in milliseconds) the Maximum Burst Length allowed for
packet bursts on the wireless network. A packet burst is a collection of
multiple frames transmitted without header information. The decreased
overhead results in higher throughput and better performance. Valid va lues
for maximum burst length are 0.0 through 999
Data 3 (Background): Lowest priority queue, high throughput. Bulk
data that requires maximum throughput and is not time -sensitive is sent
to this queue (FTP data, for example).
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User Manual