This read-write integer sets the Rate Decrease Factor (RDF) for a standard ABR connection, a unitless value that must be a power of 2 and needs to be inverted to derive its actual effect, controlling how aggressively the ABR source reduces its rate in response to negative congestion feedback. Admins configure this per the TM4.0 ABR specification's constraints, and the SNMP agent itself is expected to enforce that only power-of-2 values are accepted. For example, setting ausmStdABRRDF to a larger power-of-2 value would make the connection's rate decrease more gradually (smaller effective decrease per feedback event) than a smaller value would.