Description: This attribute indicates the congestion state of the transmit cell memory for this AtmIf. This attribute is not applicable, and is not displayed on CQC-based ATM FPs.

This attribute indicates which txCellMemoryThreshold 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 txCellMemoryThreshold. For example, CLP1 traffic is queued until the value indicated by txCellMemoryUsage equals the value indicated in txCellMemoryThreshold 3. At that point, CLP1 traffic is discarded.