This object allows discovery of how the PDU is wired. It indicates the overcurrent protector's power source which can be one of the following: - an inlet - another overcurrent protector - a transfer switch If the power source is an inlet, it contains the OID of an inletLabel in the inletConfigurationTable. The indices of the OID can then be used to reference other objects in the inlet tables. If the power source is an overcurrent protector, it contains the OID of an overCurrentProtectorLabel in the overCurrentProtectorConfigurationTable. The indices of the OID can then be used to reference other objects in the overcurrent protector tables. If the power source is a transfer switch, it contains the OID of a transferSwitchLabel in the transferSwitchConfigurationTable. The indices of the OID can then be used to reference other objects in the transfer switch tables.