If a cable without parallel power cord is used such as the black cable shown in the picture , it will be necessary to use a separate power cable, which may make the project a bit more expensive, but in some cases this solution is more professional, especially when the cameras are installed far from the DVR and the parallel cable is not good enough to carry the power.
Best coaxial cable for CCTV. This type of separate power connection is quite typical of professional cameras, especially box models that are usually used in special projects. Note in the image below, this professional camera can be powered with either volt AC Alternate current or volt DC Direct Current power. In day-to-day situations for small projects, it is rare to find professional analog cameras of this type due to cost-effectiveness, especially when it is better to use modern IP cameras rather than expensive professional analog cameras.
If the design is small and your concern is cost, it is currently more common to use traditional analog cameras with siamese cables and power connectors.
There are different analog camera technologies on the market and therefore different types of resolutions, let's discuss this topic. The resolution of an old traditional analog camera CVBS is measured in TV lines, which is nothing more than the number of vertical lines that appears on a monitor.
The higher the number of lines, the higher the resolution. Note in the picture below that there are lines on the monitor screen that make up the image, depending on the number of lines the camera can generate it is considered a higher resolution camera , although it is an old technology, we still find cameras with resolutions of , , and TV lines, however I do not recommend the use of such cameras.
As you saw before, after going through a DVR the image is converted to the digital format. When converted to this format another measurement unit is used to refer to the resolution of the camera.
The term TV lines is not used for digital resolution because the number of pixels that is available in the image is used. See in the picture below that there are several dots that form an image, they are the pixels and the higher the number of pixels, the higher the digital resolution.
It is possible to have thousands of pixels in an image, in this example, we could have cameras that generate 0. As you saw earlier, a DVR converts the analog camera signals into a digital format so it can be recorded on an internal hard drive, but not only that, the DVR also has a digital output that allows sending the camera images over a computer network and the Internet.
Note in this picture that the analog cameras are connected to the DVR that receives the signals in traditional analog format with TV lines TVL that are converted to the digital format 4CIF that represents x pixels horizontally and vertically respectively. This video in digital format is displayed on a computer screen with specific software, note in the diagram that there is a blue cable network cable connecting the digital output of the DVR to a computer.
It is also possible to connect a coaxial cable from the DVR to an analog monitor and also obtain a traditional analog video output with the TV lines.
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