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How to troubleshoot and resolve fiber optic transceivers?

Update:28-01-2021
Summary:

The use of fiber optic transceivers is very simple. Whe […]

The use of fiber optic transceivers is very simple. When the fiber optic transceivers are applied to the network, if they do not work normally, troubleshooting needs to be performed, which can be eliminated and resolved from the following six aspects:

1. The power indicator does not light up, and the optical transceiver cannot communicate.

Solution:

Check whether the power cord is connected to the power connector on the back of the fiber optic transceiver.

Connect other devices to the power outlet and check whether the power outlet is powered.

Try to use another power adapter of the same type that matches the fiber optic transceiver.

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:

Normally, the failure of the SYS indicator on the optical transceiver to indicate that the internal components of the device are damaged or cannot work normally. You can try to restart the device. If the power supply does not work, please contact your supplier for help.

3. The SYS indicator on the fiber optic transceiver keeps flashing.

Solution:

An error occurred on the machine. You can try to restart the device. If it does not work, please remove and reinstall the SFP optical module, or try to replace an SFP optical module. Or check whether the SFP optical module matches the optical transceiver.

4. The network between the RJ45 port on the fiber optic transceiver and the terminal equipment is slow.

Solution:

There may be a problem of mismatch in duplex mode between the port of the fiber optic transceiver and the port of the terminal device. This happens when the auto-negotiation RJ45 port is connected to a device whose fixed duplex mode is full duplex. In this case, you only need to adjust the duplex mode on the terminal device port and the fiber optic transceiver port so that both ports use the same duplex mode.

5. The device connected to the fiber optic transceiver is not communicating.

Solution:

The TX and RX ends of the 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 cable and the cross cable).

6. Turn on and off phenomenon

Solution:

It may be that the attenuation of the optical path is too large. At this time, an optical power meter can be used to measure the optical power of 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.

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, two fiber optic transceivers are directly connected to the PC, and both ends are PING. If it does not appear, it can be basically judged as a switch failure.

The fiber optic transceiver may be faulty. At this time, you can connect both ends of the fiber optic transceiver to the PC (don't go through the switch). After both 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 (files below 200M can be transferred for more than 15 minutes), it can basically be judged as a fiber optic transceiver failure.

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