This read-create Unsigned32 represents the lower 32 bits of the Committed Information Rate reserved for SOAM (Service OAM/Ethernet CFM) traffic on an F3 network port's QoS shaper. An administrator sets it to guarantee that operations, administration, and maintenance frames such as continuity-check messages get a committed rate distinct from the port's regular data traffic. For example, ensuring CFM heartbeat frames are never starved during congestion requires giving this SOAM CIR a small but non-zero value separate from the main data CIR.