When designing video surveillance systems, one of the main issues is the issue of organizing the power supply to the cameras and organizing power backup.
In addition to choosing backup power supplies for surveillance cameras, it is necessary to select a special cable that provides the necessary voltage drop.
In this article, we will consider how the problem of power supply in IP video surveillance systems is solved.
Our website already had an article about PoE standards used in IP video surveillance systems.
Here we will consider in more detail the advantages of this technology over CCTV systems.
The main point of PoE is precisely in organizing a power supply system for surveillance cameras — this is that power is supplied to the cameras along with data via one cable.
That is, initially a twisted pair of the required category is selected and at least there are no more concerns regarding the cable infrastructure — one cable will provide you with both data transmission and power supply to the camera. This technology is simply not achievable in analog cameras.
For them, it is necessary to select a separate coaxial cable for transmitting data from the camera to the video recorder, and a separate power cable from the backup power supply to the camera.
Also, thanks to the Hi PoE standard, it is possible to organize the power supply of an outdoor camera in a casing with heating and ventilation via one cable.
And another big advantage in using Power over Ethernet technology: centralized power backup.
PoE injectors are connected to a 220V network, as is network equipment, as is a personal computer on which monitoring and recording of information from IP surveillance cameras is carried out.
For this, you can use a common single uninterruptible power supply (UPS) or several (depending on the network architecture).
And with the help of a device such as a PoE splitter, you can supply power to an IP camera from a PoE injector, even if the camera does not provide power via PoE — a splitter located near the camera will separate the power from the data.
