This is the reverse-direction counterpart to cktAbrCDF, reporting the cutoff decrease factor applied to the reverse direction of this ABR SVC when reverse-path RM-cell feedback goes missing. Independent per-direction values let the switch respond differently to feedback loss on each leg, which matters if one direction's path is more prone to transient signaling gaps than the other. An admin diagnosing asymmetric rate collapse behavior on a bidirectional SVC would compare cktRAbrCDF to cktAbrCDF.