Signal transmission over coaxial and UTP cables is one of the main advantages of the new modern standards in comparison with traditional analogue. In modern digital and analog formats from well-known manufacturers of video surveillance systems, there is also the possibility of transmitting video and audio signals over one coaxial cable and two-way data transmission (RS-485). Moreover, this feature is claimed in all five formats - UHD, 3G-SDI, AHD, HD-TVI, HD-CVI. When transmitting UHD, 3G-SDI, AHD, HD-TVI, HD-CVI video signals, we do not recommend the use of cheap and "no name" cables, which very often are simply shielded wires. And if applied, it is only for lines of no more than 30–40 m. With a significant decrease in contrast and image clarity, PV-351R trunk amplifiers should be used at the end of the line, and not at its beginning. Normalizing amplifiers with a maximum output of 1.3–1.5 V are completely unsuitable here. In any case, it is necessary to provide the nominal level of the video signal (1V rr) at the input of the digital recorder. Only in this case there will be no decrease in contrast and the number of gradations of brightness. Applying twisted pair cable as the cheapest option for noise-free transmission for transmitting a composite signal, it is not necessary to use it at the maximum declared range. Otherwise, a maximum frequency correction will be required, which even with amplitude-frequency linearity does not always provide a linear phase-frequency characteristic. Phase distortion leads to unrecoverable artifacts, especially in a color image. In this case, it is preferable to divide the line into parts of 100-300 m, depending on the type of equipment.