Rockwell Automation 1783-WAPxxx Stratix 5100 Wireless Access Point User Manual - Manual (Page 472)

472 Rockwell Automation Publication 1783-UM006A-EN-P - May 2014
Chapter 16 Configuring QoS
This is used to rate-limit the upstream traffic originating from each of the non-
roots to root bridge incase of P2MP setup. To do rate-limiting on downstream
traffic, class-maps are applied at the root-side router/switch.
Adjusting Radio Access Categories
The access point uses the radio access categories to calculate backoff times for
each packet. As a rule, high-priority packets have short backoff times.
The default values in the Min and Max Contention page fields and in the Slot
Time fields are based on settings recommended in IEEE Draft Standard 802.11e.
For detailed information on these values, consult that standard.
The values listed in this table are to the power of 2. The access point computes
Contention page values with this equation:
CW = 2 ** X minus 1
where X is the value from Table 107 on page 472 .
IMPORTANT Rate-limiting can be applied only to ethernet ingress.
IMPORTANT Use the default settings on the Radio Access Categories page. Changing these
values can lead to unexpected blockages of traffic on your wireless LAN, and
the blockages can be difficult to diagnose. If you change these values and find
that you need to reset them to defaults, use the default settings listed in
Table 107 on page 472 .
Table 107 - Default QoS Radio Access Categories
Class of Service Min
Contention page Max Contention page Fixed Slot Time Transmit Opportunity Admission Control
Local Cell Local Cell Local Cell Local Cell Local Cell
Background 4 10 6 0
Best Effort 4 10 2 0
Video <100 ms Latency 3 2 1 3008
Voice <100 ms Latency 2 3 1 1504