The use of fiber optic transceivers is very simple. When applying fiber optic transceivers to the network, if they cannot work normally, troubleshooting is required. The following six aspects can be used to troubleshoot and solve:

1. The power indicator light is off, and the fiber optic transceiver cannot communicate.
Solution:
a. Confirm whether the power cord is connected to the power connector on the back of the fiber optic transceiver.
b. Connect other devices to the power socket and check whether the power socket is powered.
c. Try to use another power adapter of the same type that matches the fiber optic transceiver.
d. Check whether the voltage of the power supply is within the normal range.

2. The SYS indicator on the fiber optic transceiver is off.
Solution:
Typically, an unlit SYS indicator on a fiber optic transceiver indicates that internal components on the device are damaged or not functioning properly. You can try restarting the device. If the power supply does not work, please contact your supplier for assistance.

3. The SYS indicator on the fiber optic transceiver keeps flashing.
Solution:
An error has occurred on this unit. You can try restarting the device. If it doesn't work, remove and reinstall the SFP optical module, or try to replace an SFP optical module. Or check whether the SFP optical module matches the fiber optic transceiver.

4. The network between the RJ45 port on the fiber optic transceiver and the terminal equipment is relatively slow.
Solution:
There may be a duplex mode mismatch between the port on the fiber optic transceiver and the port on the end device. This happens when using an auto-negotiating RJ45 port to connect to a device whose fixed duplex mode is full duplex. In this case, simply adjust the duplex mode on the end-equipment port and the fiber optic transceiver port so that both ports use the same duplex mode.

5. There is no communication with the device connected to the fiber optic transceiver.
Solution:
The TX and RX ends of the optical fiber jumper are reversed, or the RJ45 port is not connected to the correct port on the device (please pay attention to the connection method of the straight-through cable and the crossover cable).

6. On and off phenomenon
Solution:
a. It may be that the optical path attenuation is too large. At this time, an optical power meter can be used to measure the optical power at the receiving end. If it is near the receiving sensitivity range, it can be basically judged as an optical path failure within the range of 1-2dB.
b. It may be that the switch connected to the fiber optic transceiver is faulty. At this time, replace the switch with a PC, that is, the two fiber optic transceivers are directly connected to the PC, and both ends are PING. If there is no intermittent connection, it can be basically judged as a switch. Fault.
c. It may be that the fiber optic transceiver is faulty. At this time, you can connect both ends of the fiber optic transceiver to the PC (not through a switch). After the two ends have no problem with PING, transfer a larger file (100M) or more from one end to the other, and observe Its speed, if the speed is very slow (file transfer below 200M takes more than 15 minutes), it can be basically judged as a failure of the fiber optic transceiver.

Summary
Fiber optic transceivers can be flexibly deployed in different network environments, but their connection methods are basically the same. The above connection methods, precautions and solutions to common faults are just a reference for how to use fiber optic transceivers in your network. If there is a failure that cannot be solved, please contact your supplier for professional technical support.

FiberWDM is a fiber optic product manufacturer and comprehensive solution provider. Our main products include but not limited to 1x9/XFP/SFP/SFP+/25G SFP28/40G QSFP+/100G/200G/400G QSFP optical transceivers, CWDM / DWDM /AAWG devices, optical amplifiers EDFA/100G 1310 SOA/optical repeaters OEO, optical switch, network switch, also includes network packet broker, optical network OTAP for network security system. The company has obtained ISO9001 certification, and our products have obtained CE, RoHS and SGS certificates. Therefore, customers can buy and use our optical products with confidence.