This value is the first forward traffic descriptor parameter (typically the peak cell rate) associated with the traffic descriptor type recorded in svcAtmFailedCallAtmTfdType for this failed call, per the description. This gives the actual numeric bandwidth value the call was requesting in the forward direction, which is what you'd compare against the port's available or configured bandwidth to determine if the call was rejected for legitimately exceeding capacity. A failed call requesting an unusually high value here relative to typical traffic on this port would point at admission-control rejection rather than a signaling defect.