Simple Discussion on Fault Diagnosis of Fiber Network

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-linked. Fiber patch cords are connected in parallel;

The other end is a crossover connection.

b. If the FX indicator of the A transceiver is on and the FX indicator of the B transceiver is off, the fault is on the A transceiver:

One possibility is that: A Transceiver (TX) optical transmitter port is broken, because the optical port (RX) of the B transceiver does not receive the optical signal;

Another possibility is that there is a problem with this optical fiber link of the Transmitter (TX) optical transmitter (the optical cable or the optical 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;

(However, the twisted pair indicator of some transceivers will not turn on until the fiber link is connected. See the IMC fiber transceiver commissioning manual on the website)

d. Some transceivers have two RJ45 ports: (ToHUB) indicates that the connection line connecting the switch is a through line; (ToNode) indicates that the connection line connecting the switch is a crossover line;

e. There are MPR switches on the side of some hair generators: the connection line connecting the switch is a straight-through wire; DTE switch: the connection wire connecting the switch is a cross-over wire.

2, fiber optic cable, fiber jumper has broken?

a. Optical cable cut-off detection: Use a laser flashlight, sunlight, and a luminous body to illuminate one end of the optical fiber connector or coupling; to see if there is visible light on the other side? Visible light indicates that the fiber optic cable is not broken.

b. Optical fiber continuity detection: Use a laser flashlight, sunlight, etc. to face the fiber jumper; see the other side for visible light.

Visible light indicates that the fiber jumper has not broken.

3、Has the half/full duplex method been wrong?

Some transceivers have FDX switches on the side: Full duplex; HDX switches: Half duplex.

4, using 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 light power of the fiber transceiver is between -30db and -45db, it can be judged that there is a problem with this transceiver.

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