POE you should know the secret

What is POE power supply?

POE (Power Over Ethernet) power supply refers to the technology of transmitting data and DC power for other IP-based terminals without any modification in the existing Ethernet Cat.5 cabling infrastructure.

POE power supply, in simple terms, is the power supply of the network cable, and the same network cable transmits both data and power. Therefore, POE power supply is mainly used in high-definition network digital monitoring systems, that is, network monitoring.

It is also known as a LAN-based power supply system (POL, Power over LAN), active Ethernet (AcTIve Ethernet), and Power over Ethernet.

This is the latest standard specification for the simultaneous transmission of data and electrical power using existing standard Ethernet transmission cables, and maintains compatibility with existing Ethernet systems and users.

POE power supply system

A complete POE system includes two parts: Power Sourcing Equipment (PSE) and Powered Device (PD).

The PSE device is a device that powers Ethernet client devices and is the administrator of the entire POE Power over Ethernet process.

The PD device is a power supply end load that is powered, that is, a client device of the POE system, such as an IP phone or a network camera.

The two are based on the IEEE 802.3af standard to establish information about the connection status, device type, power consumption level, etc. of the powered device, and use this as a basis for powering the PD through the Ethernet through the PSE.

POE power supply advantage set

1 Flexible wiring, no complicated power wiring required. The camera does not need to be connected to the power cord and other objects, and the cable is powered, which is beautiful and simple.

2 can minimize the cost, save the construction and maintenance costs of power supply equipment, such as power lines, sockets, line transformation, etc., as well as installation labor costs and save installation time. Moreover, when the camera is powered by the standard POE, the power receiving module automatically recognizes the power.

3 The deployment is flexible, and the device deployment location is not limited. It does not need to consider the power cable problem, socket location, and so on.

4 Supports the 802.3at standard. The maximum power supply of a single port is up to 25.5W. It also provides support for non-standard powered devices, greatly improving the service access capability of the network.

5 high safety factor, can be used for centralized power supply, easy to backup. At the same time, the power supply equipment can be connected to the UPS (Uninterrupted Power Supply), and the system can operate normally once the main power input is interrupted.

6 system guarantee, the front-end equipment has no strong electricity, there will be no accident caused by power leakage, and safety is guaranteed.

7The performance is stable, there are few wiring links, and there is no large power consumption caused by complicated lines.

8 POE with SNMP (Simple Network Management Protocol) capability for remote monitoring and management of AP and IP cameras. At the same time, the anti-interference ability is strong, and the POE power supply can prevent the signal from being disturbed, so that the monitoring picture is clear.

POE power supply shortcomings collection

The quality of the network cable is high and the transmission distance is limited. As long as the 100M switch uses 1, 4, 3, and 6 cores, the Gigabit switch is limited by data transmission. Therefore, 8 cores must be used.

Common PoE-based power supplies include PoE switches and PoE power supplies, especially PoE switches. If there is a POE switch, there is no POE camera, you don't want to waste it, you need POE power supply, but you don't need to install modules, you can use the splitter, you don't need separate power supply, it saves time and effort, and the installation is simple, just connect the network cable. Just: switch - splitter - ordinary camera.