Version 3.0.1 97 July 2010
MP-20x Telephone Adapter 9. LAN Wireless Connection
9.3.3 Wireless QoS (WMM)
Wi-Fi Multimedia (WMM) is a Wi-Fi Alliance certification based on the IEEE 802.11e draft
standard. It provides basic Quality of Service (QoS) features to IEEE 802.11 networks.
WMM can be enabled only if your wireless card supports WMM.
Background, Best Effort, Video, and Voice are access categories for packet prioritization.
Upon enabling WMM, the highest priority is given to Voice packets, decreasing towards
Background packets which receive the lowest priority. In addition, you can control the
reliability of traffic flow.
By default, the 'Ack Policy' for each access category is set to 'Normal', meaning that an
Acknowledge packet is returned for every packet received. This provides a more reliable
transmission but increases traffic load, which decreases performance. You may choose to
cancel the acknowledgement by selecting 'No Ack' in the drop-down list corresponding to
each access category, thus changing the Ack policy. This can be useful for Voice, for
example, where speed of transmission is important and packet loss is tolerable to a certain
degree.
¾ To enable WMM:
1. In the Wireless tab's screen, under the section 'Wireless QoS (WMM)', select the
'Enabled' check box; the screen refreshes.
Figure 9-13: Wireless QoS (WMM)
2. For each category, select whether an Acknowledge packet is returned for every
packet received ('Normal') or no Acknowledge packet is returned ('No Ack').
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