Optical transceiver is the terminal equipment for optical signal transmission. The role of the optical transceiver in security is mainly the transmission function of the optical transceiver itself. The function of the optical transceiver is to convert some signals with a relatively short transmission distance into signals with a relatively long transmission distance for transmission. The main function is to increase the transmission distance and play a cost-saving role in monitoring. Optical transceivers will also have some failures during use. The following are the common failures and solutions of optical transceivers. Next, Feichang Technology will provide you with detailed answers to the five common failures and solutions of optical transceivers. Let's take a look!
1. There is no video signal
1. Check whether the power supply of each device is normal.
2. Check whether the video indicator light of the corresponding channel at the receiving end is on, if the indicator light is on (the light on proves that the channel has video signal output at this time). Then check whether the video cable between the receiving end and the terminal equipment such as the monitor or DVR is well connected, and whether the video interface connection is loose or there is false welding. The video indicator on the receiving end is off. Check whether the video indicator of the corresponding channel on the front end is on. (It is recommended to re-power on the optical receiver to ensure the synchronization of the video signal) If the above method cannot eliminate the fault and there are equipment of the same model, you can use the replacement inspection method (requires the equipment to be interchangeable), that is, connect the fiber A working receiver at one end or replacing the transmitter at the far end can accurately determine the faulty equipment.
2. Interference snowflakes appear on the screen.
1. Check whether the pigtail is excessively bent (especially during multi-mode transmission, try to unfold the pigtail and avoid excessive bending). 2. Check whether the connection between the optical port and the flange of the terminal box is reliably connected and whether the flange magnetic core is damaged or not.
3. Whether the optical port and pigtail are too dirty, clean them with alcohol and cotton and wait for them to dry before inserting them.
4. When laying the line, try to use the 75-5 cable with good shielding and better transmission quality for the video transmission cable, and avoid AC lines and other objects that easily cause electromagnetic interference.
3. There is no control signal or the signal is abnormal
1. Check the data port definition in the product manual to check whether the data cable is connected correctly and firmly. Especially if the positive and negative poles of the control line are connected reversely.
2. Check whether the control data signal format sent by the control equipment (computer, keyboard or DVR, etc.) is consistent with the data format supported by the optical transceiver, and whether the baud rate exceeds the range supported by the optical transceiver (0-100Kbps).
3. According to the data port definition in the product manual, check whether the data cable is correctly connected and firm and reliable. Especially if the positive and negative poles of the control line are connected reversely.
4. The input signal of a branch disappears.
1. Observe the alarm information of the optical transceiver, and find that the 2/8 multiplexing board in the direction has a red light. At the same time, the I1 light of the monitoring alarm board is on, indicating that the 2M1 branch of the board is faulty.
2. Judging whether the branch unit of the optical transceiver is faulty or the input interface of the program-controlled computer room to the optical transceiver is faulty. There are two ways to determine: the first is to self-loop the input port of the branch. If the fault does not disappear, the branch unit is faulty. ; If the fault disappears, it is a fault on the computer room side of the program control. The second type is to use a transmission performance analyzer to monitor online at the branch input port. If "code input is normal", it means that the optical transceiver branch unit is faulty; if "code input is interrupted", it is on the computer room side of the program control. For example, the first method is used to determine that it is a fault on the side of the program-controlled computer room.
3. Further on-line test with a transmission analyzer at point B of the digital distribution rack is "code input interruption", indicating that the fault is between the switch unit-the input ports of the digital distribution rack.
4. Immediately notify the personnel in the program-controlled computer room to observe the status of the switch. It is found that the relay board to the Qiangbai circuit has an alarm light on, and the board is replaced immediately, the alarm disappears, and the circuit is unblocked. This fault is caused by the switch-related digital relay unit sending no output. This kind of failure often occurs on the joint of the cable between the switch and the optical transceiver. Need to immediately use the spare line to grab the circuit.
V. Optical receiving failure
1. Observe the alarm information of the optical transceivers of both parties. Observe the optical transceivers. It is found that the red and yellow lights of the optical panel are flashing alternately, and the lights are on and off; the lights on the monitoring alarm panel I7 and I8 are on. These messages indicate that Dali has received 10-3 and 10-6 codes; observing the Qiang white light repeater, there is no warning information. These indicate that this is a unidirectional optical path failure.
2. There are three methods to determine whether the optical board is faulty or the optical cable is faulty:
a. Replace the two optical boards with a spare board and the fault does not disappear, indicating that the fault is an optical cable failure, otherwise, it is an equipment failure.
b. Use an optical power meter to measure the light emitting and receiving power respectively, and it can also be judged whether the optical board or the optical cable is faulty.
c. Use pigtail + optical attenuator in the optical board to send and receive self-loop can also judge whether the optical board or the optical cable is faulty. I use the first method to determine that the optical cable is faulty.
3. If the optical cable has a spare core, you can try another one; if there is no spare core, you need to carefully judge whether it is a pigtail or an outdoor optical cable? Because a single-core optical cable is not good, and it is not broken at all, the outdoor cable may be broken. If the sex is small, it is better to check the pigtail first.