This is the reverse-direction counterpart to cktAbrTBE, reporting the transient buffer exposure the network guarantees for reverse-direction traffic on this SVC before congestion feedback can take effect. Since forward and reverse traffic may have very different burst characteristics, a separate reverse TBE lets the switch allocate buffer headroom proportional to actual reverse-direction burstiness rather than assuming it matches the forward path. An admin whose reverse path carries large bulk uploads would expect cktRAbrTBE to be provisioned higher than a symmetric default to avoid premature reverse-direction cell loss.