Twisted pair has been used for a long time, and it can be applied to weak current signal lines. Twisted pair is used for telephone transmission. Twisted pair is used in many industrial control systems, places with large interference and long-distance transmission. We Today’s widely used local area network also uses twisted pair
right. The reason why twisted pair is so widely used is that it has many advantages such as strong anti-interference ability, long transmission distance, easy wiring, and low price. Since the twisted pair signal also has a large attenuation, the frequency of the signal cannot be too high when the transmission distance is long, and the high-speed signal such as Ethernet can only be limited within 100m.
For video signals, the bandwidth reaches 6MHz. If it is directly transmitted in the twisted pair, it will also attenuate greatly. Therefore, to achieve long-distance transmission of the video signal on the twisted pair, it must be amplified and compensated. Twisted pair video transmission The device is to complete this function. After adding a pair of twisted-pair video transceiver equipment, the image can be transmitted to 1 to 2km. Twisted pair and twisted pair video transmission equipment are very cheap, not only does not increase the system cost, but its cost is much lower than that of coaxial cable when the distance increases.
