1. The Power light does not light up

1. Power failure.

2. The Link light is off

1. The fault may be as follows:

2. Check whether the fiber optic line is broken.

3. Check whether the loss of the optical fiber line is too large and exceeds the receiving range of the equipment.

4. Check whether the optical fiber interface is connected correctly, the local TX is connected with the remote RX, and the remote TX is connected with the local RX.

5. Check whether the optical fiber connector is well inserted into the device interface, whether the jumper type matches the device interface, whether the device type matches the optical fiber, and whether the device transmission length matches the distance.

3. The circuit Link light does not light up

1. The fault may be as follows:

2. Check whether the network cable is broken.

3. Check whether the connection type matches: the network card and routers and other devices use crossover cables, and switches, hubs and other devices use straight-through cables.

4. Check whether the transmission rate of the device matches.

4. Serious network packet loss: The possible faults are as follows:

1. The electrical port of the transceiver does not match the interface of the network device, or the duplex mode of the device interface at both ends.

2. If there is a problem with the twisted pair and the RJ-45 head, check it.

3. The optical fiber connection problem, whether the jumper is aligned with the equipment interface, whether the pigtail matches the jumper and the coupler type, etc.

4. Whether the loss of the optical fiber line exceeds the acceptance sensitivity of the equipment.