This attribute indicates the congestion state of the transmit cell
memory for the ATM Queue Manager (AQM) ASIC on this FP.
This attribute indicates which txCellMemoryThresholds corresponds
to the current value of txCellMemoryUsage. The congestion state is
used to determine if cells of a particular discard priority (DP) are
discarded before being queued for transmit.
The congestion state of transmit cell memory is indicated by a
numeric value ranging from 3 to 0. When transmit cell memory is in
congestion state 'x', traffic with DP > 'x' is discarded before
transmit. Traffic with DP < 'x' may be queued for transmit,
depending on the congestion level of the connection transmit queue.
Traffic with DP = 'x' may be either queued or discarded depending
on how close the value of txCellMemoryUsage is to the next
threshold as displayed in txCellMemoryThresholds. For example,
CLP1 traffic is queued until the value indicated by
txCellMemoryUsage equals the value indicated in
txCellMemoryThresholds 3. At that point, CLP1 traffic is discarded.