This attribute has been obsoleted and migrated under the NrtVbr subcomponent. In addition, the type and range of new attribute has been changed. This attribute specifies the tolerable cell loss ratio (CLR) for nrt- VBR traffic. The number is the logarithm (base 10) of the CLR. In other words if the target CLR = 1E-10 then vbrNrtCellLossRatio = - 10.This number must be greater than or equal to vbrRtCellLossRatio since rt-VBR traffic has a higher discard priority. The vbrNrtCellLossRatio is used by the Connection Admission Control (CAC) algorithm to compute the required (equivalent) cell rate for nrt-VBR connections.

There is a trade-off between the service category CLR and the achievable link utilization. To guarantee an excellent service category, the CLR should be as small as possible (e.g., 1E-10). However, a smaller CLR results in a larger equivalent cell rate for a given connection and hence a lower link utilization.