[FSD-805xx] Why the 100Base-FX port on the FSD-805SC / FSD-805S15 didn't work?

1.Check the DIP switch at the left side of the FSD-805SC /
　FSD-805S15 to the "FX" side.
2.And if not change to Fiber and check the fiber's TX and RX
　connect correctly then power on again.
3.Make sure fiber cable match the specification, example:
　Single-mode or Multi-mode.
4.The FSD-805SC / FSD-805S15 only support 100Base-FX
　 "Full-Duplex".