The luminous power of fiber optic transceivers or optical modules is as follows: multi-mode is between 10db--18db; single-mode 20km is between -8db--15db; and single-mode 60km is between -5db--12db. But if the luminous power of the fiber optic transceiver appears between -30db--45db, then it is very likely that there is a problem with the fiber optic transceiver. So, how to judge whether there is a problem with the fiber optic transceiver. Just look down.
Fiber Transceiver
(1), first check whether the indicator light of the fiber optic transceiver or optical module and the indicator light of the twisted pair port are on
a. If the optical port (FX) indicator of the transceiver is off, please confirm whether the optical fiber link is cross-linked? One end of the fiber optic jumper is connected in parallel; the other end is connected in a crossover manner.
b. If the optical port (FX) indicator light of A transceiver is on, but the optical port (FX) indicator light of B transceiver is not on, the fault is at the end of A transceiver: one possibility is: A transceiver (TX) optical transmission The port is broken, because the optical port (RX) of the B transceiver cannot receive the optical signal; another possibility is: there is a problem with the optical fiber link of the optical sending port of the A transceiver (TX) (the optical cable or the optical jumper may broken).
c. The twisted pair (TP) indicator light is not on. Please confirm whether the twisted pair cable is wrong or connected incorrectly? Please use a continuity tester to detect (however, the twisted pair indicator light of some transceivers must wait for the optical fiber chain It will only light up when the road is connected).
d. Some transceivers have two RJ45 ports: (ToHUB) indicates that the connection line connected to the switch is a straight line; (ToNode) indicates that the connection line connected to the switch is a crossover line.
e. There is an MPR switch on the side of some transmitters: it means that the connection line connected to the switch is a straight-through line; DTE switch: the connection line connected to the switch is a crossover line.
(2) Whether the optical cable and optical fiber jumper are broken
a. Optical cable on-off detection: use a laser flashlight, sunlight, or luminous body to illuminate one end of the optical cable connector or coupler; see if there is visible light at the other end? If there is visible light, it indicates that the optical cable is not broken.
b. On-off detection of optical fiber connection: use a laser flashlight, sunlight, etc. to illuminate one end of the optical fiber jumper; see if there is visible light at the other end? If there is visible light, it indicates that the optical fiber jumper is not broken.
(3) Whether the half/full duplex mode is wrong
Some transceivers have FDX switches on the side: full-duplex; HDX switches: half-duplex.
(4) Detect with an optical power meter
Luminous power of fiber optic transceiver or optical module under normal conditions: multi-mode: between -10db--18db; single-mode 20km: between -8db--15db; single-mode 60km: between -5db--12db ;If the luminous power of the fiber optic transceiver is between: -30db--45db, then it can be judged that there is a problem with the fiber optic transceiver.
Well, the above is how to judge whether there is a problem with the fiber optic transceiver. I hope it will be helpful to everyone! With the continuous maturity of the optical fiber market, the application fields of optical fiber are becoming more and more extensive. With the wide application of optical fiber, it is inevitable that there will be failure problems. But as long as we find out the cause, we can solve it accordingly!
