This read-write integer (1..32768) is the Rate Decrease Factor for a standard-ABR connection, a unitless value that must be inverted to get the actual decrease factor, and it is restricted to powers of 2 (1, 2, 4, 8, ... 32768), with the SNMP agent enforcing that compliance. An administrator sets RDF to control how aggressively the ABR source's allowed cell rate is decreased in response to congestion feedback. For example, setting frstdABRRDF to 8 (an accepted power of 2) produces a different, more gradual rate-decrease behavior than setting it to the maximum 32768, and attempting to set it to a non-power-of-2 like 10 would be rejected by the agent.