D-Link DWS-1008 Product Manual - Page 211
WMM QoS on an AP, SVP QoS Mode
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WMM QoS on an AP Access points use forwarding queues to prioritize traffic for wireless clients. For a packet received by the AP from a client, the AP classifies the packet based on the service type in the 802.11 header and maps the service type value to an internal CoS value. The AP then marks the DSCP value in the IP tunnel header to the switch based on the internal CoS value. For a packet received from a DWS-1008 switch and addressed to a client, the AP classifies the packet by mapping the DSCP value in the IP tunnel header to an internal CoS value. The AP then assigns the packet to a forwarding queue based on the internal CoS value. The AP also marks the service type in the 802.11 header based on the internal CoS value. An AP uses the DSCP-to-CoS and CoS-to-DSCP mappings of the switch that is managing it. If you change mappings on a switch, the change also applies to the AP. Likewise, if an AP changes to another switch (for example, after an AP restart), the AP uses the mappings in effect on the new switch. The table below lists the default mappings between an AP's internal CoS values and its forwarding queues. CoS 1 or 2 0 or 3 4 or 5 6 or 7 AP Forwarding Queue Background Best Effort Video Voice SVP QoS Mode The SVP QoS mode optimizes forwarding of SVP traffic by setting the random wait time an AP radio waits before transmitting the traffic to 0 microseconds. Normally, an AP radio waits an additional number of microseconds following the fixed wait time, before forwarding a queued packet or frame. Each forwarding queue has a different range of possible random wait times. The Voice queue has the narrowest range, whereas the Background and Best Effort queues have the widest range. The random wait times ensure that the Voice queue gets statistically more access to the air than the other queues. By setting the random wait time to 0 for SVP, the SVP QoS mode provides SVP traffic the greatest possible access to the air, on a statistical basis. The QoS mode affects forwarding of SVP traffic only. The random wait times for other types of traffic are the same as those used when the QoS mode is WMM. D-Link DWS-1008 User Manual 192
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