This read-write parameter specifies the Committed Information Rate (CIR) for this PVC in kilobits per second (0 to 1536 Kbps range), representing the minimum guaranteed bandwidth the carrier reserves. Network engineers set the CIR based on their service contract to reflect the minimum throughput required for that circuit; burst traffic up to the port speed may also be allowed. For example, a CIR of 512 Kbps guarantees that at least 512 Kbps of bandwidth is reserved for this PVC, even if other PVCs are congested.