Wireless Wmm Qos Setup - TRENDnet TEW-738APBO User Manual

TRENDnet User's Guide
Synchronization field. The preamble is used to signal "here is a train of data coming"
to the receiver. The short preamble provides 72-bit Synchronization field to improve
WLAN transmission efficiency with less overhead.
WMM: By default, it's "Enabled".
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Wireless WMM QoS Setup

To achieve optimal wireless performance, it is necessary to tweak advance setting per
requirements properly, not necessary higher the better or lower.
The administrator can change the RTS threshold and fragmentation threshold settings
for the system. Please click on Wireless -> Advanced
WMM Parameters of Access Point : This affects traffic flowing from the access point
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to the client station
Data
Queue Transmitted Priority
AP to Clients
High throughput. Bulk data that requires maximum
AC_BK Background. Low
throughput and is not time-sensitive is sent to this
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Description
queue (FTP data, for example).
Medium throughput and delay. Most traditional IP
AC_BE Best Effort Medium
data is sent to this queue
Minimum delay. Time-sensitive video data is
AC_VI Video High
automatically sent to this queue
Time-sensitive data like VoIP and streaming media
AC_VO Voice High
are automatically sent to this queue
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
o
milliseconds) for data frames
CWmin: Minimum Contention Window. This parameter is input to the algorithm
o
that determines the initial random back-off 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 back-off
wait time is determined.
CWmax: Maximum Contention Window. The value specified here in the
o
Maximum Contention Window is the upper limit (in milliseconds) for the doubling
of the random back-off 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".
Txop: Transmission Opportunity is an interval of time when a WME AP has the
o
right to initiate transmissions onto the wireless medium (WM). This value
specifies (in milliseconds) the Transmission Opportunity (TXOP) for AP; that is, the
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