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Power Supply Principle of POE Camera Recorder

1. Power supply mode of poe camera recorder

The poe camera recorder, also known as the power-over-Ethernet network video recorder, is a kind of surveillance camera, a new technology that has only appeared in the past two years. POE is also called Power over LAN (POL) or Active Ethernet, sometimes also referred to as Power over LAN for short. This is the latest standard specification that uses the existing standard Ethernet transmission cable to transmit data and electrical power at the same time, and maintains compatibility with the existing Ethernet system and users;

A POE power supply scheme. The POE standard defines a method for using Ethernet transmission cables to transmit DC power to POE-compatible devices: a method called "intermediate jumper method", which uses idle pairs of Ethernet cables that are not used. To transmit DC power, the corresponding Endpoint PSE (Endpoint Power Supply Equipment) supports POE Ethernet switches, routers, hubs or other network switching equipment.

2. POE power supply or centralized power supply, which is better for NVR?

POE power supply means that the network switch provides DC48V power to the network camera. When wiring, only a network cable is needed. This must be supported by the switch and IPCAM. Centralized power supply is to route the power cord from the monitoring center to each camera.

Only by understanding the principle of the power supply of the two, can we know the difference between the two: first, the centralized power supply is suitable for all monitoring systems; while the POE power supply is only suitable for the poe camera recorder. Secondly, the centralized power supply guarantees the special requirements of the dedicated line of the monitoring system; while the POE power supply is only suitable for special requirements in a small area, and the distance between the poe camera recorder and the switch cannot exceed 90 meters. Finally, from the perspective of wiring costs, the cost difference between one wire and two wires is not too big, except for the increase in cable cost.

Based on the above three points, please judge for yourself.

2. Regarding the power supply of the poe camera recorder

The first type is that the switch does not support Poe power supply. It uses outdoor power and supplies power nearby.

The second type, the switch supports poe power supply, the camera's DC head does not need to be connected, and the camera switch is directly connected with an 8-core network cable.

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