Airlink101 APO1200 User Manual page 31

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 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 right to initiate
transmissions onto the wireless medium (WM). This value specifies (in milliseconds) the Transmission
Opportunity (TXOP) for AP; that is, the interval of time when the WMM AP has the right to initiate
transmissions on the wireless network.
ACM : Admission Control Mandatory, ACM only takes effect on AC_VI and AC_VO. When you do not click
Checkbox, it means that the ACM is controlled by the connecting AP. If you click Checkbox, it means that the
Client is in charge.
AckPolicy : Acknowledgment Policy, WMM defines two ACK policies: Normal ACK and No ACK. Click
"Checkbox" indicates "No ACK"
When the no acknowledgment (No ACK) policy is used, the recipient does not acknowledge received
packets during wireless packet exchange. This policy is suitable in the environment where communication
quality is fine and interference is weak. While the No ACK policy helps improve transmission efficiency, it
can cause increased packet loss when communication quality deteriorates. This is because when this policy
is used, a sender does not retransmit packets that have not been received by the recipient.
When the Normal ACK policy is used, the recipient acknowledges each received unicast packet.
WMM Parameters of Station : This affects traffic flowing from the client station to the access point.
Data Transmitted
Queue
Clients to AP
AC_BK Background.
AC_BE Best Effort
AC_VI Video
AC_VO Voice
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
Priority
High throughput. Bulk data that requires maximum throughput and is not time-
Low
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
Description
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