This attribute specifies the peak-to-peak cell delay variation (CDV)
which is contributed to all rt-VBR connections associated with this
Vpt.
The CDV is a measure of the delay jitter introduced mostly by
traffic buffering and cell scheduling.
The value of this attribute is used by PNNI in the Resource
Availability Information Group (RAIG) topology updates and route
selection. It is also used by CAC at connection set-up time to
determine whether this Vpt can meet the CDV requirement for that
connection. If so, the value of this attribute is added to the
cumulative CDV field of the extended QoS information element.