Brocade Mobility 5181 Access Point Product Reference Guide (Supporting software release 4.4.0.0) - Manual (Page 127)

Brocade Mobility 5181 Access Point Product Reference Guide 113
53-1002516-01
Enabling wireless LANs (WLANs)
5
CAUTION
Brocade recommends using the drop-down menu to define the intended radio traffic within the
WLAN. Once an option is selected, you do not need to adjust the values for the Access
Categories, unless qualified to do so. Changing the Access Category default values could
negatively impact the performance of the access point.
7. Select the Enable Wi-Fi Multimedia (WMM) QoS Extensions check box to configure the Mobility
5181 Access Point’s QoS Access Categories. The Access Categories are not configurable
unless the check box 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.
11b - wifi Use this setting for high-end devices multimedia devices that use the
802.11b radio.
11ag - default Use this setting for typical “data-centric” Client traffic over the high rate
802.11a or 802.11g radio.
11b - default Use this setting for typical “data-centric” Client traffic over the 802.11b
radio.
11ag voice Use this setting for “Voice-Over-IP” traffic over the high rate 802.11a or
802.11g radio.
11b voice Use this setting for “Voice-Over-IP” traffic over the 802.11b radio.
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
Client 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 Client 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.