Optical fiber transceivers are widely used in video surveillance. It is an Ethernet transmission media conversion unit that exchanges short-distance twisted-pair electrical signals and long-distance optical signals. It is also called photoelectric in many places. Converter (Fiber Converter). It is generally used in the actual network environment where the Ethernet cable cannot cover and must use optical fiber to extend the transmission distance, and is usually located at the access layer application of the broadband metropolitan area network; for example: high-definition video image transmission for surveillance security engineering; while helping It also plays a huge role in connecting the one kilometer line after the optical fiber to the metropolitan area network and the outer layer network.
In the process of using, you will definitely encounter some problems. Let's analyze some common problems in the use of optical fiber transceivers together!
1. Power light is off
If the power light does not light during the operation of the fiber optic transceiver, it is a power failure. This time we are going to
(a) Check whether the optical fiber line is broken
(b) Check whether the fiber line loss is too large and exceeds the receiving range of the equipment
(c) Check whether the fiber interface is properly connected, the local TX is connected to the remote RX, and the remote TX is connected to the local RX.
(d) Check whether the optical fiber connector is well inserted into the device interface, whether the jumper type matches the device interface, whether the device type matches the optical fiber, and whether the device transmission length matches the distance.
2. If the LOS light is on, it means that the following fault has occurred in the optical fiber transceiver, let's take a look!
(a) The optical cable from the computer room to the user end has been broken;
(b) The slots of the SC pigtail and the optical fiber transceiver are not inserted or disconnected.
3. If the Link light is off, there may be the following situations:
(a) Check whether the optical fiber line is broken
(b) Check whether the optical fiber line loss is too large and exceeds the receiving range of the equipment
(c) Check whether the fiber interface is properly connected, the local TX is connected to the remote RX, and the remote TX is connected to the local RX.
(d) Check whether the optical fiber connector is well inserted into the device interface, whether the jumper type matches the device interface, whether the device type matches the optical fiber, and whether the device transmission length matches the distance.
4. Network packet loss may cause serious failure as follows:
(a) The electrical port of the transceiver does not match the network device interface, or the duplex mode of the device interface at both ends.
(b) If there is a problem with the twisted pair and the RJ-45 head, check
(c) Optical fiber connection, whether the jumper is aligned with the device interface, and whether the pigtail matches the type of the jumper and coupler.
5. After the fiber transceiver is connected, the two ends cannot communicate
(a) The optical fiber is reversed, and the optical fibers connected to TX and RX are swapped
(b) The RJ45 interface is not properly connected to the external device (note the straight-through and spliced)
The optical fiber interface (ceramic ferrule) does not match. This fault is mainly reflected in the 100M transceiver with photoelectric mutual control function. For example, if the pigtail of the APC ferrule is connected to the transceiver of the PC ferrule, it will not communicate normally, but it is not connected. The photoelectric mutual control transceiver has no effect.
6. On-off 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 with an optical power meter. If it is near the receiving sensitivity range, it can basically be judged as an optical path failure within the range of 1-2dB
(b) The switch connected to the transceiver may be faulty. At this time, replace the switch with a PC, that is, the two transceivers are directly connected to the PC, and the two ends are paired with PING.
(c) The transceiver may be faulty. At this time, connect the two ends of the transceiver to the PC (do not pass through the switch). After the two ends have no problem with PING, transfer a larger file (100M) from one end to the other end and observe it. The speed, if the speed is very slow (file transfer below 200M for more than 15 minutes), it can basically be judged as a transceiver failure.
7. After a period of communication, if it crashes, it cannot communicate, and it will return to normal after restarting
This phenomenon is generally caused by the switch. The switch will perform CRC error detection and length check on all received data. If a packet is found to be erroneous, it will be discarded, and the correct packet will be forwarded. However, some packets with errors in this process cannot be detected in the CRC error detection and length check. Such packets will not be sent out or discarded during the forwarding process, and they will accumulate in the dynamic cache. In the (buffer), it can never be sent out. When the buffer is full, it will cause the switch to crash. Since restarting the transceiver or restarting the switch at this time can restore the communication to normal, users usually think that it is the problem of the transceiver.
8. Transceiver test method If you find a problem with the transceiver connection, please test according to the following methods in order to find out the cause of the failure
(a) Near-end test:
The computers at both ends are pairing PING, if it can be connected, it proves that there is no problem with the fiber transceiver. If the near-end test fails to communicate, it can be judged as a fiber transceiver failure.
(b) Remote test:
Computers at both ends are paired with PING. If PING is unavailable, you must check whether the optical path connection is normal and whether the transmit and receive power of the fiber transceiver is within the allowable range. If it can be pinged, it proves that the optical connection is normal. It can be judged that the fault is on the switch.
(c) Remote test to determine the fault point:
First connect one end to the switch and the two ends to PING. If there is no fault, it can be judged as the fault of the other switch.
Seeing here, you should be able to deal with some of the transceiver failures you see. It is no problem now. The level of optical fiber transceivers is now very perfect. Shenzhen Tianbo Communication Equipment Co., Ltd. focuses on the production and development of optical communication products. 20 years, is a veteran communication equipment manufacturer, product repair rate is quite low, three years warranty, solve your worries!
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