This read-create enumerated value configures the ABR Cutoff Decrease Factor, which controls how aggressively the allowed cell rate is decreased in response to lost or delayed backward RM cells. An admin tunes this to determine how quickly an ABR source throttles back when congestion feedback is missing, with larger values producing faster rate decreases and more conservative behavior under uncertain network conditions. For example, on a link prone to occasional RM-cell loss, the admin might choose a larger cutoff decrease factor to ensure the source backs off promptly rather than continuing to send at a potentially unsustainable rate.