With the development of the economy, video surveillance has gone from all corners of the society where the initial requirements of video surveillance are relatively high, such as government, military and other departments. Among them, the video optical transceiver's credit can't be erased. It is precisely because of the continuous maturity of video optical transceiver technology that the price of video optical transceiver has changed from the initial expensive to the current low cost, resulting in the video optical transceiver being used for transmitting and receiving ports. . Optical transceivers are now mainly used in:
First, the traditional technical anti-monitoring application video optical transceiver
Technical defense monitoring mainly targets parks, key parts, public places, finance and business premises. These application areas have different requirements for optical transceivers. They are mainly video-based, and supplemented by a reverse control data interface to control the lens head. It can be interfaced with the alarm switch, and some have audio monitoring requirements. Since these application fields are extremely sensitive to price, a single-channel video analog optical transceiver or a cost-effective 4-channel optical optical transceiver is generally used. Since the general optical transceiver does not support the transmission of the switch, some manufacturers have specially designed the switch expansion interface to support this application. The audio interface of the optical transceiver is generally the line level, that is, the voltage type small signal. The input terminal must be connected to the front audio amplifier to connect to the microphone, and the output terminal must be connected to the audio amplifier to push the speaker. Therefore, attention should be paid to the front and rear configuration of the optical transceiver when there is a monitoring request. It should also be noted that because the general low-end analog optical transceiver products only configure one RS485 reverse data on the data channel, and generally only support the highest rate of 19.2Kb (or even lower), when encountering some can only use the standard RS485 Half-duplex mode-controlled matrix keyboards, high-speed domes (also two-wire control, extremely confusing), and the 19.2Kb Manchester code, Manchester code, will not work.
Second, urban road traffic monitoring application video optical transceiver
The optical transceiver was used in urban road traffic monitoring early, and its fiber network is characterized by numerous nodes and a star network structure. That is, each intersection has an independent fiber connection to the accusation center. In terms of application requirements, in addition to the backhaul requirements for video images at the monitoring points, it also involves high-speed dome control, signalling network control, electronic police data back-transmission, electronically induced display control, and real-time traffic detection data. Backhaul, etc., some places also require two-way audio function. Therefore, when selecting an optical transceiver, in addition to providing a video channel, two to three bidirectional RS232/485 data channels and one audio channel should be provided. It should be noted that the data interface rate required by electronic police equipment is getting higher and higher, from 38.4K to 115.2K, and even some require connection through 10/100M Ethernet interface. This also puts higher technical requirements on the optical transceiver data port. In addition, in the accusation center, due to the large number of receivers that need to be placed, high-density mounting subracks conforming to the standard 19-inch rack must be configured.
Third, high-grade highway monitoring application video optical transceiver
High-grade road monitoring is currently concentrated on toll stations and key sections such as bridges and tunnels. Its obvious features are large video capacity, long distance, chain network structure, and tight fiber resources. In terms of transmission interface requirements, in addition to large-capacity video ports, there are often two-way intercoms such as interfaces supporting AIPHONE intercom, telephone interfaces, and 10/100M Ethernet interfaces for automated office work. In this case, the digital optical transceiver coarse wavelength division multiplexing CWDM technology is generally used for networking. At present, the maximum video capacity of a single-ended single-wavelength device of a digital uncompressed optical transceiver is only 16 channels (2.5 Gb rate). After adopting CWDM technology, 8 waves can satisfy the forward 128-channel video transmission, and the reverse application 1310 nm wavelength is Can form a complete high-capacity fiber transmission system. It should be pointed out that such a complicated system needs to be determined by repeated argumentation and calculation by the manufacturer. The uncertain problem should also require the manufacturer to simulate the engineering environment and build an experimental platform to demonstrate.
Fourth, large-scale enterprise industrial TV monitoring application video optical transceiver
Due to the harsh electromagnetic environment and serious interference, large industrial and mining enterprises are industries that use optical transceivers for industrial TV monitoring. In this kind of application, there is mainly a large amount of video backhaul, so the choice of pure video optical transceiver can meet the requirements. Many enterprises have opened their own internal data fiber networks, and often require monitoring equipment to use existing fiber resources. At this time, it is necessary to understand some technical parameters and surplus core status of the original optical network. When the original fiber is a multimode fiber, it is also necessary to know whether it is a 50/125mm or a 62.5/125mm multimode fiber. Otherwise, it will cause trouble when purchasing optical transceivers and matching pigtails.
As time goes by, video optical transceivers will certainly be applied in more fields, and the video optical transceiver market will become more and more popular.
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