Methods for Judging the Failure of the Indicator Light of the Fiber Optic Transceiver

This article will share with you the problems and solutions frequently encountered during the installation and use of fiber optic transceivers. When encountering these problems, how should we deal with them? The following are some practical methods with which you can determine whether the indicator light of the fiber optic transceiver is faulty:

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

(1) 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: the optical transmission port of the A transceiver (TX) is broken because the optical port (RX) of the B fiber optic transceiver cannot receive optical signals; the other possibility is: the optical transmission port of the A transceiver (TX) There is a problem with this optical fiber link, such as a broken fiber jumper.

(2) If the FX indicator of the transceiver is off, please make sure whether the optical fiber link is cross-linked. One end of the fiber jumper is connected in parallel; the other end is connected in cross mode.

(3) Twisted pair (TP) indicator is off, please make sure whether the twisted pair connection is wrong or the connection is wrong. Please use a continuity tester to test, but the twisted pair indicator of some fiber optic transceivers will only turn on after the fiber link is connected.

(4) There are various fiber optic transceiver types, and please judge the error based on the specific transceiver. Some transceivers have two RJ45 ports: To HUB means that the cable connecting to the switch is a straight-through cable; To Node means that the cable connecting to the switch is a crossover cable.

(5) There is an MPR switch on the side of some fiber optic transceivers: it means that the cable connecting the optical network switch is a straight-through cable; DTE switch: the cable connecting the switch is a crossover cable.

2. Analyze and judge whether there are problems with the fiber jumpers and cables of the fiber optic transceiver

(1) Optical fiber connection on-off detection: 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.

(2) 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.

3. Determine whether the half-duplex mode and full-duplex mode of the fiber optic transceiver are wrong

There is an FDX switch on the side of some transceivers: it means full-duplex; HDX switch: it means half-duplex.

4. Use optical power meter to detect the fiber optic transceiver

The luminous power of the optical fiber transceiver or optical module under normal conditions:

Multi-mode 2Km: between -10db and 18db;

Single mode 20 kilometers: between -8db and 15db;

Single mode 60 kilometers: between -5db and 12db;

If the luminous power of the optical fiber transceiver is between -30db and 45db, then it can be determined that there is a problem with the transceiver.