[CAUSE] The tmnxSfmIcPortDown alarm is generated when the SFM interconnect port is not operational. The reason may be a cable connected incorrectly, a disconnected cable, a faulty cable, or a misbehaving SFM interconnect port or SFM card. [EFFECT] This port can no longer be used as part of the user plane fabric between chassis. Other fabric paths may be available resulting in no loss of capacity. [RECOVERY] A manual verification and testing of each SFM interconnect port is required to ensure fully functional operation. Physical replacement of cabling may be required.