Datasheet

Network Management
5-35
5. Use the two Multicast Address fields to specify one or two MAC addresses to be used for
multicast applications. Some VoIP devices make use of multicast addresses. Using this
mechanism ensures that the multicast packets for these devices are not delayed by the
packet queue.
6. Select the Enable Wi-Fi Multimedia (WMM) QoS Extensions checkbox to configure
the AP-5131’s QoS Access Categories. The Access Categories are not configurable unless
the checkbox is selected. Access Categories include:
7. 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 below.
NOTE Wi-fi functionality requires that both the AP-5131 and its associated
clients are WMM-capable and have WMM enabled. WMM enabled
devices can take advantage of their QoS functionality only if using
applications that support WMM, and can assign an appropriate priority
level to the traffic streams they generate.
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.