Description: This attribute indicates the total transmit cell memory size and the discard thresholds of the transmit cell memory. The transmit cell memory is the memory used for storing ATM cells to be transmitted by this FP.

The first value indicates the the total transmit cell memory size. This is derived based upon the connectionPoolCapacity and the txCellMemoryAllocation attributes.

When the txCellMemoryAvailable attribute decreases to the second value, the txCellMemoryCongestionState changes from 3 to 2. In congestion state 2, traffic with discard priority (DP) = 3 is discarded. This threshold is set approximately at 25 percent of the first value, the total transmit cell memory size.

When the txCellMemoryAvailable attribute decreases to the third value, the txCellMemoryCongestionState changes from 2 to 1. In congestion state 1, traffic with discard priority (DP) >= 2 is discarded. This threshold is set approximately at 20 percent of the first value, the total transmit cell memory size.

When the txCellMemoryAvailable attribute decreases to the fourth value, the txCellMemoryCongestionState changes from 1 to 0. In congestion state 0, traffic with discard priority (DP) >= 1 is discarded. This threshold is set approximately at 10 percent of the first value, the total transmit cell memory size.

The opposite effect occurs when the txCellMemoryAvailable attribute increases (txCellMemoryCongestionState increases from 0 to 3 accordingly).