This read-only value reports the ABR CDF (Cutoff Decrease Factor) for this SVC, which controls how the allowed cell rate is reduced when the source detects it hasn't received expected RM-cell feedback within the CRM (missing-RM-cell) interval, i.e., a more severe backoff triggered by suspected loss of feedback rather than explicit congestion signaling. A larger CDF causes a steeper cutback when feedback goes missing, treating silence as a worse sign than an explicit mild congestion indication. An engineer seeing an ABR SVC's rate crash to near zero after a brief signaling glitch, rather than degrading gradually, might find cktAbrCDF set aggressively high.