Cambium Networks PMP 450 AP, Configuration Manual

Page: 271 / 649

Chapter 1: Configuration Configuring quality of service
Page
1-243
WFQ with SM Prioritization
Note
This feature is not supported on PMP 450m.
Figure 39 shows a WFQ configuration with the SM Prioritization feature also enabled.
Figure 39 WFQ with SM Prioritization
In the example shown in Figure 39 , 2 of the 8 SMs have been configured for the High Priority Group. The
other 6 are in the Low Priority group. 45% of air interface timeslot resources have been allocated to the
Low priority group. The same allocation rules described above still apply to the WFQ allocation, but
now these allocations are done within the confines of each Prioritization group. So, in this configuration
shown in
Figure 39 , the 2 Medium Priority QoS level Data channels in the High Priority SM Prioritization
Group together share 12% of the committed air interface resources per direction. (.55 x .22 = .12) The
same CIR allocation rules apply. The Cambium scheduler will attempt to meet those CIR allocations
within the confines of that 12% allocation. If the traffic load on those 2 data channels is light, for example
using only 5% of the available slots, then the remaining 7% of resources can be used for other traffic in a
strict priority manner. (i.e. attempt to honor CIR’s first, then Ultra High Priority traffic, then High Priority
traffic, and so on, as described previously).