This read-write integer (3..255) is Trm, the upper bound in milliseconds on the time between forward RM cells for an active standard-ABR source. An administrator sets Trm to ensure RM cells are sent at least this often even when the source has not yet accumulated Nrm data cells, keeping rate feedback timely. For example, setting frstdABRTrm to a low value like 5 forces more frequent RM cell transmission during periods of light data traffic than a higher value like 200 would.