This read-only value reports the ABR transient buffer exposure (TBE) for this SVC, the number of cells the network guarantees buffering for during the interval before the source can react to the first RM-cell congestion signal. TBE effectively caps how much data can be 'in flight and unaccounted for' during the feedback loop's reaction time, so it directly bounds worst-case buffer requirements the switch must reserve for this connection. An engineer sizing switch buffer allocation across many ABR SVCs would sum each connection's cktAbrTBE value to ensure aggregate buffer capacity isn't oversubscribed.