This read-write value sets the ATM Burst Tolerance for this port, expressed in units of 32 cells, defining how large a burst above the Sustainable Cell Rate, lportSustCellRate, the traffic contract will tolerate before cells are considered non-conformant. An admin increases this to accommodate bursty application traffic that occasionally exceeds the sustained rate without wanting those bursts penalized, at the cost of needing deeper buffering to support it. For example, setting lportBurstTolerance to 10 allows bursts of up to 320 cells, 10 times 32, above the sustained rate before the traffic policing considers the burst excessive.