This attribute specifies the default queuing option for unshaped
connections of the CBR service category. On ATM IP cards, this
attribute controls whether common or per-VC queueing is used.
Per-VC queueing means that each connection has its own buffering
and queue limits.
Common queueing means that cells are queued in First In First Out
order on a common queue for this service category. The common
queue has one set of congestion control levels for all cells enqueued
on it.
For CQC-based ATM cards, this attribute must be set to common.
CQC-based ATM cards do not support per-VC queueing for the
CBR service category.
For ATM IP cards, if traffic shaping for this service category is not
disabled, this attribute must be set to perVc.
This attribute does not apply to standard Vpt Vccs and basic Vpts.