The "TX Fault" for ports on the x690 is always set to "yes" for SFPs .
It does not impact the functionality of the ports. It is just a display warning.
X690-48x-2q-4c.2 # debug hal show optic-info port 11
SFP or SFP+: SFP
Signal: not present
TX Fault: yes
SFP/SFP+ Vendor: FINISAR CORP.
SFP/SFP+ Part Number: FTRJ-8519-7-EXT
SFP/SFP+ Serial Number: P11S7J1
SFP/SFP+ Manufacture Date: 030723
SFP/SFP+ Type: SFP/SFP+
GE Compliance: 1000BASE-SX