Xingchuang Guangtong: A Brief Discussion on Optical Terminal Troubleshooting

With the development of urban processes and the complexity of the security environment, more and more optical fiber technologies are used in security monitoring projects to transmit information such as images, sounds, and data. Digital optical transceivers, the key equipment of optical fiber transmission systems, are favored by users.

Here are the relevant knowledge points for everyone to popularize by Xingchuang Guangtong:

Optical transceiver troubleshooting

One, no video signal

1. Check whether the power supply of each device is normal.

2. Check whether the corresponding channel video indicator on the receiver is lit.

A: If the indicator light is on (the light indicates that the channel already has a video signal output). Then check whether the video cable between the receiver and the terminal device such as the monitor or DVR is connected properly, and whether the video interface connection is loose or there is a false weld.

B: The video indicator on the receiving end is off. Check whether the corresponding channel video indicator on the front end is on. (It is recommended to re-power the optical receiver to ensure the synchronization of the video signal)

a: The light is on (the light indicates that the video signal collected by the camera has been sent to the front end of the optical transceiver). Check whether the optical cable is connected, and whether the optical interface of the optical transceiver and the optical cable terminal box is loose. It is recommended to re-plug the fiber connector once (if the pigtail is dirty, it is recommended to clean it with cotton alcohol before inserting it).

b: The lamp is off. Check if the camera is working properly and if the video cable from the camera to the front-end transmitter is connected reliably. The video interface is loose or there is a false weld.

If the above method can not eliminate the fault and have the same type of equipment, you can use the replacement inspection method (requires that the equipment is interchangeable). That is, the optical fiber can be accurately judged when it is connected to a working receiver at the other end or a remote transmitter is replaced. Faulty equipment.

Second, the picture appears disturbing snowflake

This situation is mostly due to excessive attenuation of the fiber link or long-distance video cables that are subject to AC electromagnetic interference.

1: Check if the pigtails are bent excessively (especially when the multi-mode transmission is carried out, the pigtails should be stretched as far as possible so as not to bend too much). 2: Check whether the connection between the optical port and the terminal box flange is reliable and whether the flange core is damaged or not. 3: If the optical port and pigtails are dirty, apply alcohol and cotton to clean them before drying. 4: When laying the line, the video transmission cable should be made of 75-5 cable with good shielding and good transmission quality, and should try to avoid the AC line and other objects that easily cause electromagnetic interference.

No control signal or control signal is abnormal

Check the optical transceiver data signal is correct.

a: Check the data port of the product manual. Check if the data cable is connected correctly and firmly. In particular, the positive and negative poles of the control line are reversed.

b: Check whether the format of the control data signal sent by the control device (computer, keyboard, or DVR, etc.) is the same as the data format supported by the optical transceiver, and whether the baud rate exceeds the range supported by the optical transceiver (0-100 Kbps).

c: Check the data port of the product manual. Check if the data cable is connected correctly and firmly. In particular, the positive and negative poles of the control line are reversed.