[CAUSE] The tmnxCpmIcPortDown alarm is generated when the CPM interconnect port is not operational. The reason may be a cable connected incorrectly, a disconnected cable, a faulty cable, or a misbehaving CPM interconnect port or card. [EFFECT] At least one of the control plane paths used for inter-chassis CPM communication is not operational. Other paths may be available. [RECOVERY] A manual verification and testing of each CPM interconnect port is required to ensure fully functional operation. Physical replacement of cabling may be required.