The network is not stable and intermittent. It is found that the SPD light of the optical transceiver does not light up, and the 100M light is not lighted when it is connected to the switch. Why is this?

What do the four indicators of FX, TPL, FUL and SPD mean?

The six lights explain and indicate the function:

POWER: On, it means that the fiber optic transceiver is powered on.

FX LINK/ACT: On, it means that the optical fiber interface has been connected; flickering, it means that the optical fiber interface is receiving or sending data.

FX100: On, it means that the optical port of the transceiver is in 100M state, the same as that of 1000M.

FDX/COL: On, it means the transceiver is in full-duplex, working mode; off, it means the transceiver is in half-duplex, working mode; blinking, means there is a connection conflict or collision.

TP LINK/ACT: On, it means that the connection on the optical transceiver is good; blinking, it means that the RJ45 on the optical transceiver has data to receive or send.

TP100: On, it means the speed of the twisted pair port is 100M; off, it means the speed of the twisted pair port is 10M.