Brocade Mobility 7131N-FGR Access Point Product Reference Guide (Supporting software release 4.0.0.0-35GRN and later) - Manual (Page 144)

132 Brocade Mobility 7131N-FGR Product Reference Guide
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Enabling Wireless LANs (WLANs)
5
7. Select the Enable Wi-Fi Multimedia (WMM) QoS Extensions checkbox to configure the Brocade
Mobility 7131N-FGR Access Point’s QoS Access Categories. The Access Categories are not
configurable unless the checkbox is selected. Access Categories include:
8. Configure the CW min and CW max (contention windows), AIFSN (Arbitrary Inter-Frame Space
Number) and TXOPs Time (opportunity to transmit) for each Access Category. Their values are
explained as follows.
9. Click Apply to save any changes to the New QoS Policy or Edit QoS Policy screen to return to the
Quality of Service Configuration screen. Navigating away from the screen without clicking Apply
results in all changes to the screens being lost.
10. Click Cancel to securely exit the New QoS Policy or Edit QoS Policy screen and return to the
Quality of Service Configuration screen.
11. Click Logout within the Quality of Service Configuration screen to securely exit the Access Point
applet. A prompt displays confirming the logout before the applet is closed.
Background Backgrounds traffic is typically of a low priority (file transfers, print
jobs ect.). Background traffic typically does not have strict latency
(arrival) and throughput requirements.
Best Effort Best Effort traffic includes traffic from legacy devices or
applications lacking QoS capabilities. Best Effort traffic is
negatively impacted by data transfers with long delays as well as
multimedia traffic.
Video Video traffic includes music streaming and application traffic
requiring priority over all other types of network traffic.
Voice Voice traffic includes VoIP traffic and typically receives priority over
Background and Best Effort traffic.
CW Min The contention window minimum value is the least amount of time
the MU waits before transmitting when there is no other data
traffic on the network. The longer the interval, the lesser likelihood
of collision. This value should be set to a smaller increment for
higher priority traffic. Reduce the value when traffic on the WLAN
is anticipated as being smaller.
CW Max The contention window maximum value is the maximum amount
of time the MU waits before transmitting when there is no other
data traffic on the network. The longer the interval, the lesser
likelihood of collision, but the greater propensity for longer
transmit periods.
AIFSN The AIFSN is the minimum interframe space between data
packets transmitted for the selected Access Category. This value
should be set to a smaller increment for higher priority traffic to
reduce packet delay time.
TXOPs Time 32usec The TXOPs Time is the interval the transmitting MU is assigned for
transmitting. The default for Background traffic is 0. The same
TXOPs values should be used for either the 802.11a/n or
802.11b/g/n radio, there is no difference.
TXOPs Time ms TXOP times range from 0.2 ms (background priority) to 3 ms (video
priority) in a 802.11a/n network, and from 1.2 ms to 6 ms in an
802.11b/g/n network. The TXOP bursting capability greatly
enhances the efficiency for high rate traffic such as streaming
video.