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Unied Access Point Administrator’s Guide
Unied Access Point Administrator’s Guide
Page 71
March 2012
Section 5 - Conguring Access Point Services
Field Description
Max. Burst Length The Max. Burst Length is an AP EDCA parameter and only applies to trafc owing from
the AP to the client station.
This value species (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 values for maximum burst length are 0.0 through 999.
Wi-Fi Multimedia (WMM) Settings
Wi-Fi MultiMedia
(WMM)
Wi-Fi MultiMedia (WMM) is enabled by default. With WMM enabled, QoS prioritization and
coordination of wireless medium access is on. With WMM enabled, QoS settings on the
UAP control downstream trafc owing from the AP to client station (AP EDCA parameters)
and the upstream trafc owing from the station to the AP (station EDCA parameters).
Disabling WMM deactivates QoS control of station EDCA parameters on upstream trafc
owing from the station to the AP.
With WMM disabled, you can still set some parameters on the downstream trafc owing
from the AP to the client station (AP EDCA parameters).
To disable WMM extensions, click Disabled.
To enable WMM extensions, click Enabled.
Station EDCA Parameters
Queue Queues are dened for different types of data transmitted from station-to-AP:
•) Data 0 (Voice) — Highest priority queue, minimum delay. Time-sensitive data such as
VoIP and streaming media are automatically sent to this queue.
•) Data 1(Video) — Highest priority queue, minimum delay. Time-sensitive video data is
automatically sent to this queue.
•) Data 2 (Best Effort) — Medium priority queue, medium throughput and delay. Most
traditional IP data is sent to this queue.
•) 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).
AIFS (Inter-Frame
Space)
The Arbitration Inter-Frame Spacing (AIFS) species a wait time for data frames. The wait
time is measured in slots. Valid values for AIFS are 1 through 255.
cwMin (Minimum
Contention Window)
This parameter is used by the algorithm that determines the initial random back off wait
time (window) for retry of a data transmission during a period of contention for Unied
Access Point resources. The value specied here in the Minimum Contention Window is
the upper limit (in milliseconds) of a range from which the initial random back off wait time
will be determined. The rst random number generated will be a number between 0 and the
number specied here. If the rst random back off wait time expires before the data frame
is sent, a retry counter is incremented and the random back off value (window) is doubled.
Doubling will continue until the size of the random back off value reaches the number
dened in the Maximum Contention Window.
cwMax (Maximum
Contention Window)
The value specied here in the 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.
TXOP Limit The TXOP Limit is a station EDCA parameter and only applies to trafc owing from the
client station to the AP. The Transmission Opportunity (TXOP) is an interval of time, in
milliseconds, when a WME client station has the right to initiate transmissions onto the
wireless medium (WM) towards the Unied Access Point. The TXOP Limit maximum value is
65535.
Other QoS Settings
No
Acknowledgement
Select On to specify that the AP should not acknowledge frames with QosNoAck as the
service class value.
APSD Select On to enable Automatic Power Save Delivery (APSD), which is a power management
method. APSD is recommended if VoIP phones access the network through the AP.