Fault determination method of optical transceiver indicator light


The fiber optic transceiver has six LED indicators, which show the working status of the transceiver. According to the leds, we can determine whether the transceiver is working properly and what problems may occur, thus helping to find out the fault. Their functions and fault determination are described as follows:


Fiber optic transceiver

1. Check whether the indicator on the optical transceiver or optical module and the indicator on the twisted pair port are on.

A. If the optical port (FX) indicator of the transceiver is off, check whether the optical fiber links are cross-linked. One end of the fiber jumper receives in parallel mode; The other end is a cross-over connection.


B. If the optical port (FX) indicator of transceiver A is on and the optical port (FX) indicator of transceiver B is not on, the fault is at the transceiver A: One possibility is that the optical transmitting port of transceiver A (TX) is bad, because the optical port (RX) of transceiver B cannot receive optical signals; Another possibility is that there is A problem with the optical link of the TX transceiver (the cable or light jumper may be broken).


C. The twisted-pair (TP) indicator is off. Check whether the twisted-pair cable is correctly connected. Use the on-OFF tester to check (although some transceiver TWisted-pair indicators will not turn on until the fiber link is connected).


D. Some transceivers have two RJ45 ports :(ToHUB) indicates that the cable connecting to the switch is a straight-through cable; (ToNode) Indicates that the cable connecting to the switch is a crossover cable.


E. Some transceivers have MPR switches on the side, indicating that the cable connecting the switch is in straight-through mode. DTE switch: A crossover cable is used to connect the switch.


2, optical cable, optical fiber jumper is broken?


A, optical cable connection detection: laser flashlight, sunlight, luminous body on the optical cable connector or coupling one end of light; Is there any visible light on the other side? Visible light indicates that the cable is not broken.


B. Optical fiber connection detection: use laser flashlight, sunlight, etc. to shine light on one end of the optical fiber jumper; Is there any visible light on the other side? If visible light is present, the fiber jumper is not broken.


3. Is the half/full duplex mode wrong?


Some transceivers have FDX switches on the side: full duplex; HDX switch: indicates half duplex.


4, optical power meter instrument detection


Optical transceiver or optical module in normal conditions: multi-mode 2Km: between -10db and 18db; Single mode 20km: between -8dB - 15dB; Single mode 60km: between -5dB - 12dB; If the luminous power of the optical fiber transceiver is between: -30dB - 45dB, then it can be judged that there is a problem with the transceiver.


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