This table defines a mapping between an RPD Unique Identifier and the corresponding CCAP Core assigned CM Id (CmtsCmRegStatusId). This provides lookup capabilities for CMs connected to an RPD (or vice versa) and the associated US and DS RF Ports on the RPD. When it is able to learn the node RF port to which a CM is attached to an RPN, the CCAP Core SHOULD report the NodeRfPortId attribute of the CcapRpdToCmMapStatus object for that CM. The mechanism by which the CCAP Core learns the NodeRfPortId of a CM is not standardized. The NodeRfPortId attribute can be reported whether or not the CM connects through an RPN capable of Partial Spectrum operation. An RPN is considered to be Partial Spectrum-capable per direction. If it reports the NodeRfPortId attribute of CcapRpdToCmMapStatus for a CM from a Partial Spectrum-capable RPN in either direction, the CCAP Core omits reporting the RpdUsRfPortNum and RpdDsRfPortNum attribute of CcapRpdToCmMapStatus and instead reports the RpdUsRfPortList and RpdDsRfPortList attributes.