Chapter 1: Configuration
Configuring quality of service
Page
1-242
For example, if, during peak traffic hours, the Ultra High, High, and Low priority Data channels were
experiencing heavy traffic loads, but the medium priority aggregate traffic load was light and only used
10% of the scheduling slots in a particular direction, the remaining unused 12% of the slots would be
allocated first to the Ultra High priority traffic in queue. When all the Ultra High priority traffic has been
scheduled, then any remaining unused slots would be used for High Priority traffic. Finally, after High
Priority traffic has been serviced, any remaining slots would be used for Low Priority traffic. The “Low
Priority” in the sub-heading “Low Priority SM’s WFQ Configuration” shown above simply indicates that
the SM Prioritization feature is turned off in this example above. The “Valid” indication in this screenshot
is a simple software check to make sure that the configured percentages add up to 100%.
WFQ with CIR
Note
This feature is not supported on PMP 450m.
The WFQ feature can be used with, or as a replacement for, configuring Committed Information Rates
(CIR) per data channel. When the WFQ feature is used with CIR’s, Cambium’s scheduler will first
prioritize scheduling of the Data channels configured with a CIR, but only within the limits of that QoS
level’s WFQ allocation.
Using the example configuration show in
, there are 8 high priority Data channels. If 5 of those
8 Data channels have a CIR configured, then the Cambium scheduler will prioritize traffic on those 5
Data channels up to their CIR limits, for those 26% of the timeslots allocated to that QoS level.
Operators should try to avoid oversubscription of CIR’s. But if CIR’s have been oversubscribed at any 1
QoS level such that the desired CIR rates cannot be met within the limits of that level’s WFQ allocation,
the scheduler will use unallocated slots from another QoS level in strict priority order.
From the prior example, if there is less than 22% of timeslots worth of traffic on the medium priority
Data channels, those unused slots would be allocated to Ultra High Priority traffic on Data channels that
had not met their CIR commitment within the WFQ allocation, then on High Priority Data channels that
had not met their CIR commitment within WFQ allocation, then on Low Priority Data channels that had
not met their CIR commitment with WFQ allocation, then on Ultra High Priority traffic above and
beyond any CIR configurations, and so on.
Summary of Contents for PMP 450 AP
Page 51: ...Chapter 1 Configuration Quick link setup Page 1 23 ...
Page 155: ...Chapter 1 Configuration Configuring security Page 1 127 ...
Page 163: ...Chapter 1 Configuration Configuring security Page 1 135 ...
Page 164: ...Chapter 1 Configuration Configuring security Page 1 136 ...
Page 193: ...Chapter 1 Configuration Configuring radio parameters Page 1 165 ...
Page 194: ...Chapter 1 Configuration Configuring radio parameters Page 1 166 ...
Page 195: ...Chapter 1 Configuration Configuring radio parameters Page 1 167 ...
Page 206: ...Chapter 1 Configuration Configuring radio parameters Page 1 178 ...
Page 210: ...Chapter 1 Configuration Configuring radio parameters Page 1 182 ...
Page 636: ...Chapter 5 Troubleshooting Logs Page 5 16 Figure 95 SM Authorization log ...
