This attribute specifies the tolerable cell loss ratio (CLR) for nrt- VBR traffic except for connections managed by a Vpt CA. The number is the negative logarithm (base 10) of the CLR. In other words if the target CLR = 1E-10 then NrtVbr cellLossRatio = 10. This number must be greater than or equal to RtVbr cellLossRatio since rt-VBR traffic has a higher discard priority. The NrtVbr cellLossRatio 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.

Setting this attribute to 0 means that a CLR of 1 can be tolerated. In this case no bandwidth is reserved for nrt-VBR connections, and CAC is effectively turned off. All nrt-VBR connections are admitted.