Fiber Transceiver Frequently Asked Questions part 1

Update:03 Sep 2018

1.Power light is not lit electricity failure 2. The LOS […]

1.Power light is not lit

electricity failure

2. The LOS light does not shine and must have the following faults:

(a) The cable from the equipment room to the customer terminal has been broken.

(b) The slots of the SC pigtail and fiber optic transceiver are not plugged in or disconnected.

3. If the Link light is off, there may be the following:

(a) Check if the fiber optic line is open;

(b) Check if the fiber optic line is excessively worn and exceeds the receiving range of the device.

(c) Check if the fiber interface is connected correctly, the local TX is connected to the remote RX, and the far TX is connected to the local RX.

(d) Check if the fiber connector is properly inserted into the device interface, whether the jumper type matches the device interface, whether the device type matches the fiber, and whether the device transmission length matches the distance.

4. The circuit Link light does not light up and may have the following conditions:

(a) Check if the network cable is open.

(b) Check if the connection type matches: devices such as network cards and routers use crossover lines, and switches, hubs, etc. use straight-through lines.

(c) Check if the device transmission rate matches.

5. Network packet loss may be as follows:

(a) The electrical port of the transceiver is interfaced with the network device, or the duplex mode of the interface of the two devices does not match.

(b) Twisted pair and RJ-45 head have problems and are tested.

(c) Fiber connection problem, whether the jumper is aligned with the device interface, whether the pigtail matches the jumper and the coupler type.

6. The fiber transceivers cannot communicate after the two ends are connected.

(a) The fiber is reversed, and the fiber connected to TX and RX is reversed.

(b) The RJ45 interface is not properly connected to the external device (note the straight-through and spliced).

The fiber interface (ceramic ferrule) does not match. This fault is mainly reflected in the 100M transceiver with photoelectric mutual control function. If the pigtail of the APC ferrule is connected to the transceiver of the PC ferrule, it will not be able to communicate normally. The photoelectric intercommunication transceiver has no effect.

7. Time-breaking phenomenon

(a) It may be that the optical path attenuation is too large. At this time, the optical power of the receiving end can be measured by the optical power meter. If it is near the receiving sensitivity range, it can be basically judged as optical path failure within the range of 1-2dB.

(b) The switch connected to the transceiver may be faulty. In this case, the switch is replaced by a PC, that is, the two transceivers are directly connected to the PC, and the two ends are connected to PING. If the switch is not present, the switch can be basically determined to be a fault of the switch.

(c) It may be a transceiver failure. In this case, connect the transceiver to the PC at both ends (do not pass the switch). After both sides have no problem with PING, transfer a larger file (100M) from one end to the other and observe it. The speed, such as the speed is very slow (file transfer below 200M for more than 15 minutes), can basically judge the transceiver failure.

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