This sets the assured, minimum-guaranteed-under-contention upstream bandwidth, in kbps, for ONUs bound to this profile, per the description and its UNITS clause. Unlike the fixed rate, an assured rate is a guarantee honored specifically under contention rather than a constant grant, so it protects a subscriber's minimum upstream speed during PON congestion without permanently reserving that bandwidth while the subscriber sits idle - the key operational difference from eponDbaProfileFixRate. An assure rate of 10000 (10 Mbps) guarantees a subscriber at least that much upstream throughput even when the shared PON is busy, unlike a fixed rate which would reserve it whether the PON is busy or not.