Para obter a transmissão-de longa distância de sinais de vídeo em cabos de-par trançado, a amplificação e a compensação devem ser realizadas. O equipamento de transmissão de vídeo de-par trançado completa esta função. Depois de adicionar um par de equipamentos de transceptor de vídeo de par trançado, a imagem pode ser transmitida para 1 a 2 km. Se o método de retransmissão for usado, a distância de transmissão pode ser dobrada e a qualidade da imagem transmitida pode ser comparável à do transceptor óptico. O preço dos equipamentos de transmissão de vídeo de par trançado e par trançado é muito barato, além de não aumentar o custo do sistema, seu custo é muito menor que o do cabo coaxial quando a distância aumenta. Portanto, o uso de transmissão de par trançado no sistema de monitoramento tem vantagens óbvias:
1. Longa distância de transmissão e alta qualidade de transmissão.
Due to the advanced processing technology used in the twisted pair transceiver, the attenuation of the video signal amplitude of the twisted pair pair and the attenuation difference between different frequencies are perfectly compensated, and the brightness and color of the original image and the real-time performance are maintained. When the transmission distance reaches 1km or more, the image signal is basically free of distortion. If the relay method is used, the transmission distance will be longer.
2. A fiação é conveniente e a taxa de utilização do cabo é alta.
A pair of ordinary telephone lines can be used to transmit video signals. In addition, any pair of Category 5 unshielded twisted-pair cables widely laid in buildings can transmit one video signal without additional wiring. Even re-wiring, Category 5 cables are easier than coaxial cables. In addition, there are 4 pairs of twisted pairs in a Category 5 cable. If one pair of wires is used to transmit video signals, the other pairs of wires can also be used to transmit audio signals, control signals, power supply or other signals, improving the cable performance. Utilization rate, while avoiding the trouble caused by the separate wiring of various signals, reducing the engineering cost.
3. Forte capacidade anti-interferência.
The twisted pair can effectively suppress common mode interference, and even in a strong interference environment, the twisted pair can transmit excellent image signals. Moreover, several pairs of twisted pairs in one cable are used to transmit different signals respectively, and there will be no interference with each other.
4. Alta confiabilidade e fácil de usar.
Using twisted pair to transmit video signal, a dedicated transmitter should be connected to the front end, and a dedicated receiver should be connected to the control center. This twisted pair transmission equipment is cheap and easy to use. It does not require professional knowledge and does not require much operation. It can be installed once and can work stably for a long time.
The price is cheap and the materials are convenient.
Since the common Category 5 unshielded cables or common telephone lines that are widely used are used, it is easy to purchase and the price is very cheap, which brings great convenience to engineering applications.
