Twisted pair transmission has the following advantages:
1. High definition image quality transmission. In the range of the nominal transmission distance, a high-definition image signal can be transmitted in real time point-to-point. The actual visual transmission effect of the laboratory, when the cable length is 1500 meters, there is almost no difference between the camera and the monitor directly connected.
2. The transmission distance is long and the transmission quality is high. Due to the advanced processing technology used in the twisted pair transceiver, the attenuation of the amplitude of the video signal of the twisted pair and the attenuation difference between different frequencies are well compensated, and the brightness and color of the original image and the real-time performance are maintained. When the transmission distance reaches 1 km or more, the image signal is substantially free of distortion. If you use the relay method, the transmission distance will be farther.
3. Convenient wiring and high cable utilization. There are 4 pairs of twisted pairs in a Category 5 UTP, which can transmit 4 channels of video signals. If a pair of lines is used to transmit video signals, the other pairs of lines can also be used to transmit audio signals, control signals, power supplies or other. Signals improve cable utilization while avoiding the hassle of separate wiring of various signals and reducing engineering costs.
4, strong anti-interference ability. 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 a UTP cable are used to transmit different signals without interference.
5. High reliability and easy to use. The video signal is transmitted by twisted pair, and the dedicated transmitting device is connected to the front end, and the dedicated receiving device is connected to the control center. This twisted pair transmission equipment is cheap and easy to use, requires no special knowledge, and does not have much operation, one installation, and long-term stable work.
6. The transmission cost is low. Take the transmission of 4 channels of image 1200 meters as an example to estimate the system cost. Option A: Use 75-9 video cable plus amplifier, cable 5 yuan / m × 1200 m × 4 + amplifier 50 yuan × 4 units = 24200 yuan; Option B: use this equipment, the same transmission 1200 meters, the total cost is : 8-core five-type twisted pair cable 2.0 yuan / m × 1200 m + transmitter 150 yuan × 4 pairs = 3000 yuan. As can be seen from the above data, the use of twisted pair transmission equipment can save more than 80% of the cost. In terms of transmission effect, scheme A is close to scheme B. Signal indicator.
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