This attribute specifies the default cell delay variation tolerance
(CDVT) for connections of the CBR service category. An override
to this default may be specified for a provisioned connection under
the Vcd Tm or Vpd Tm component.
This attribute is used by the CAC function to compute the
equivalent cell rate (ECR) required by a given CBR connection. The
larger the value of CDVT, the larger is its ECR.
If Usage Parameter Control (UPC) is enabled for a connection,
CDVT is used by the UPC function on the ingress to decide whether
a cell is conforming or non-conforming based on the connection's
traffic descriptor type. The larger the CDVT value, the more tolerant
is the UPC of bandwidth usage beyond the traffic contract.