Chapter 1: Configuration Configuring quality of service
Page
1-237
MIR Data Entry Checking
Uplink and downlink MIR is enforced as shown in Figure 34.
Note
In these figures, entry refers to the setting in the data rate parameter, not the burst
allocation parameter.
Figure 34 Uplink and downlink rate caps adjusted to apply aggregate cap
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 is
enforced for the SM can be calculated as shown in Figure 35.
Figure 35 Uplink and downlink rate cap adjustment example
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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 (CIR)
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 or RF conditions are degraded. CIR is oversubscribed when there is not enough
available bandwidth to support CIR configuration for all subscribers. In this condition, SMs which are
configured with a nonzero CIR will all operate at the maximum data rate supported by the link (subject
to Maximum Information Rate and Burst Rate/Allocations). SMs which are configured with a CIR of 0
kbps will not transmit until CIR-configured SMs have completed transmission. CIR may be configured
independently for low priority traffic, medium priority traffic, high priority traffic, and ultra high priority
traffic.
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
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
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