This read-create Unsigned32 holds the lower 32 bits of the Service OAM Committed Information Rate (SOAM-CIR) reserved on a per-COS access-port QoS Shaper for OAM/CFM traffic. As with the flow-level SOAM-CIR object, this guarantees a small reserved bandwidth slice for connectivity-fault-management frames right at the access port, so OAM continuity checks keep working even under customer-traffic congestion. For example, an admin running frequent CFM loss-measurement tests over a heavily loaded access port would set cmAccPortQosShaperSoamCIRLo to guarantee those OAM frames a small reserved rate even when the port's customer traffic saturates its shaper.