This read-only Integer32 (0..2147483647) reports the Transient Buffer Exposure for the ABR call in the forward direction, the negotiated number of cells the network wants to limit the source to sending during setup, before the first RM-cell returns. An administrator uses this to understand how much buffering the network needs to provision for this specific ABR call's initial burst before closed-loop rate control takes effect. For example, a network engineer sizing switch buffers for a set of ABR calls sums their cwspAbrCallFwdTbe values to estimate worst-case transient buffer demand before RM-cell feedback stabilizes each flow.