PMP 450 Configuration and User Guide
Task 11: Configuring quality of service
pmp-0050 (May 2012)
2-107
MIR Data Entry Checking
Uplink and downlink MIR is enforced as shown in
In these figures,
entry
refers to the setting in the data rate parameter, not the burst allocation parameter.
Figure 22
Uplink and downlink rate caps adjusted to apply aggregate cap
uplink cap enforced =
uplink entry x aggregate cap for the SM
uplink entry + downlink entry
downlink cap enforced =
downlink entry x aggregate cap for the SM
uplink entry + downlink entry
For example, in the SM, if you set the
Sustained Uplink Data Rate
parameter to 2,000 kbps and the
Sustained
Downlink Data Rate
parameter to 10,000 kbps, then the uplink and downlink MIR that will be enforced for the
SM can be calculated as shown in
Figure 23
Uplink and downlink rate cap adjustment example
uplink cap enforced =
2,000 kbps x 7,000 kbps
2,000 kbps + 10,000 kbps
= 1,167 kbps
downlink cap enforced =
10,000 kbps x 7,000 kbps
2,000 kbps + 10,000 kbps
= 5,833 kbps
In this example case, the derived 1,167-kbps uplink and 5,833-kbps downlink MIR sum to the fixed 7,000-kbps
aggregate cap of the SM.
Committed Information Rate
The Committed Information Rate (CIR) capability feature enables the service provider to guarantee to any
subscriber that bandwidth will never decrease to below a specified minimum, unless CIR is oversubscribed.
Bandwidth can be, and typically will be, higher than the minimum, but this guarantee helps the WISP to
attract and retain subscribers.
In BAM Release 2.1 and in Prizm Release 2.0, CIR configuration is supported as follows:
The GUI allows you to view and change CIR configuration parameters per SM.
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