Dynamix UM-A User Manual page 56

Peak Cell Rate: This value specifies the maximum, and in some cases guaranteed, cell rate
for CBR and VBR-nrt. Peak Cell Rates are typically measured in Cells/Second, however, the
user entered value is in kbps and is then converted by the firmware.
Note : Range for Peak Cell Rate field is 0-32767, default is 0.
Sustainable Cell Rate: This is the sustained rate at which a PVC enabled with VBR-nrt can
transmit ATM cells. Sustainable Cell Rate (SCR) can be considered as the true reserved
bandwidth for a PVC.
Note :Range for Sustainable Cell Rate field is 0-32767, default is 0.
Max Burst Size: This is the number of cells a PVC enabled with VBR-nrt can transmit
continuously at peak cell rate (PCR).
Note : Range for Max Burst Size field is 0-32767, default is 0.
A. Example: CBR and UBR :
This example is provided to further explain the dynamics of UBR and CBR and how different
PVCs with different service category specifications coexist.
In this example, the ADSL upstream is 900 kbps.
Note: In the case of multiple PVCs, CBR specified PVCs will have higher
priority than PVCs with UBR. For example, the CBR PVCs will take their
bandwidth and the remaining bandwidth will be split among the UBR PVCs.
In the case of total PVC CBR bandwidth exceeding ADSL upstream, the total
upstream bandwidth will be shared proportionally to the bandwidth allocated
for each CBR PVC.
4/1 Port ADSL Router P 55