Cerio OW-200N2 User Manual page 199

Data Transmitted
Queue
AP to Clients
AC_BK Background.
AC_BE Best Effort
AC_VI Video
AC_VO Voice
Configuring QoS options consists of setting parameters on existing queues for different types of wireless
traffic. You can configure different minimum and maximum wait times for the transmission of packets in each
queue based on the requirements of the media being sent. Queues automatically provide minimum
transmission delay for Voice, Video, multimedia, and mission critical applications, and rely on best-effort
parameters for traditional IP data.
As an Example, time-sensitive Voice & Video, and multimedia are given effectively higher priority for
transmission (lower wait times for channel access), while other applications and traditional IP data which are
less time-sensitive but often more data-intensive are expected to tolerate longer wait times.
Aifsn : The Arbitration Inter-Frame Spacing Number specifies a wait time (in milliseconds) for data
frames
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.
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
500mW eXtreme Power 11Na Outdoor Bridge
Priority
High throughput. Bulk data that requires maximum throughput and is not
Low
time-sensitive is sent to this queue (FTP data, for example).
Medium Medium throughput and delay. Most traditional IP data is sent to this queue
High Minimum delay. Time-sensitive video data is automatically sent to this queue
Time-sensitive data like VoIP and streaming media are automatically sent to this
High
queue
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User's Manual
Description