Fiber Optic Media Converters Off Reasons

Fiber Optic Media Converters are used to convert an Ethernet device with cat5 or cat6 cable to fiber optic cable. By enabling this conversion, the user is now able to . They are widely used in Local Area Networks (LAN), Metro Area Network (MAN) and data transport systems to enable connectivity and fiber distance extension. Sometimes there would be a disconnection, how to judge whether there is a problem with the media converter?
(1) First, check the indicator light of the converter or optical transceiver and the twisted pair indicator port are on or not.
a. If the FX indicator of the converter is off, please confirm whether the fiber link is cross-linked, One side of fiber jumper is connected in parallel; the other is connected in cross mode.
b. If the A converter optical port (FX) indicator is on but the B converter optical port (FX) indicator is off, the fault is at the A converter with one possibility is: A converter TX port is broken due to the B converter RX port does not receive the optical signal; another possibility is the fiber cable or fiber jumper between the two is broken.
c. The twisted pair (TP) indicator is off, please check whether the twisted pair connection is wrong or the connection is wrong? Use a continuity tester to test, however, the twisted pair indicator lights of some media converter must wait until the fiber link is connected.
d. Some fiber optic media converters have two RJ45 ports: (ToHUB) indicates that the connecting line to the switch is a straight-through line; (ToNode) indicates that the connecting line to the switch is a crossover line.
e. Some have an MPR switch: it means that the connection line to the switch is a straight-through line; DTE switch: the connection line to the switch is a cross-over mode.
(2) Check the optical cable and optical fiber jumper.
Use VFL to test the cable or patch cord
(3) Whether the half / full duplex mode is wrong
Some media converter have switches on the side FDX means full duplex; HDX mean half duplex.
(4) Test with optical power meter
The optical power of the media converter under normal conditions: multi-mode: between -10db–18db; single-mode 20 kilometers: -8db–15db; single-mode 60 kilometers: -5db–12db ; If the optical power is between: -30db-45db, then it can be confirmed the media converter has problem