Cause of failure: The failure of the fiber optic transceiver may be caused by dust inside the machine or at the interface for many times. This requires us to observe whether there is more dust inside or outside the failure machine during the fault maintenance process. , Dust removal should be performed first, followed by subsequent fault diagnosis. When excluding the reasons for the failure of the fiber transceiver, you can check from the following aspects one by one:
1, the surrounding environment: including the engine room conditions, temperature, humidity, electromagnetic interference sources, grounding, etc.;
2, the hardware environment; including plugs, seats and slots (plugs, seats, slots on the metal pin oxidation phenomenon);
3, the software environment; mainly including the software version of the device network management chip and network management software version, agent module version;
4, pay attention to the user's operating habits, configuration methods and other processes.
1. First, check whether the indicator of the fiber transceiver or optical module and the twisted pair port indicator are on.
a. If the FX indicator of the transceiver is off, please confirm whether the fiber link is cross-connected. The fiber jumpers on the A side are connected in parallel; the B ends are connected in the crossover mode.
b. If the optical port (FX) indicator on the A-side transceiver is on and the optical port (FX) indicator on the B-side transceiver is off, the fault is on the A transceiver:
One possibility is that the A-side transceiver (TX) optical transmission port is broken because the optical port (RX) of the B-end transceiver receives no optical signal; the other possibility is: A-side transceiver (TX) optical transmission There is a problem with this fiber link at the mouth (the fiber cable or light jumper may be broken).
c. The twisted pair (TP) indicator is off. Please check if the twisted pair connection is wrong or connected incorrectly. Please use the continuity tester to test;
d. Some transceivers have two RJ45 ports: (ToHUB) indicates that the connection line connecting the switch is a straight line; (ToNode) indicates that the connection line connecting the switch is a crossover line;
e. Some MPR switches are located on the side of the transceiver: the connection line connecting the switch is a straight-through cable; DTE switch: the connection cable connecting the switch is a cross-over cable.
2, fiber optic cable, fiber jumper has broken?
a. Optical cable cut-off detection: Use a laser flashlight, sunlight, and light to illuminate one end of the cable connector or coupling; to see if there is visible light at the other end? Visible light indicates that the fiber optic cable is not broken.
b. Optical fiber continuity detection: use a laser flashlight, sunlight, and a luminous body to illuminate one end of the optical fiber jumper; to see if there is visible light at the other end. Visible light indicates that the fiber jumper has not broken.
3ã€Has the half/full duplex method been wrong?
Some transceivers have FDX switches on the side: Full duplex; HDX switches: Half duplex
4, using the optical power meter instrument to detect the optical transceiver or optical module under normal circumstances, the luminous power: multi-mode: -10db - 18db; single-mode 20 km: -8db - 15db; single-mode 60 km : -5db - 12db; if the optical transceiver power in the light: -30db - 45db, then you can determine this transceiver has a problem.
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