What Is POE?

- Jun 12, 2020-

In recent years, the development momentum of POE power supply technology has become stronger and stronger. With a series of advantages such as simplified installation and deployment of power-consuming equipment, energy saving, and security, PoE power supply has become the new favorite in scenarios such as wireless coverage, security monitoring, and smart grids. So, what is POE technology and where can it be applied?


1. What is POE technology

POE (Power Over Ethernet) refers to the existing Ethernet Cat.5 cabling infrastructure without any changes, for some IP-based terminals (such as IP phones, wireless LAN access point AP, network cameras Etc.) While transmitting data, it can also provide DC power supply technology for such devices.

POE technology can ensure the normal operation of the existing network while ensuring the safety of the existing structured wiring, and minimize the cost. A complete PoE system includes two parts: power supply equipment (PSE, Power Sourcing Equipment) and power receiving equipment (PD, Powered Device).

Power Supply Equipment (PSE): Ethernet switches, routers, hubs, or other network switching devices that support POE.

Power receiving device (PD): mainly in the surveillance system is the network camera (IPC)

2. Where can POE technology be applied

The application scope of PoE can be viewed from two aspects: low power and high power.


1. Low power application range

The power requirements of IP-based terminal products such as wireless APs, IP phones, and IP network cameras generally do not exceed 12W, which is also the most important field of PoE switch applications.

By deploying PoE technology, it solves the problem of wireless AP's difficulty in power supply in the ceiling ventilation layer, the problem of IP phone power outage due to accidental events, and the problem of IP network cameras needing to obtain power supply from the outside. And through the QoS, VLAN, ACL and other functions of the PoE switch itself, it can meet the requirements of the network for priority allocation, delay, jitter, security, and data isolation.

timg (1)

2. High power application range

In addition to traditional application areas, PoE switches also have larger applications in security protection, building control, retail, entertainment and RFID and other emerging markets, such as PoE smoke detectors, POS machine information terminals, PTZ cameras, and even WiMax base stations.

By supporting the IEEE802.3af standard and the IEEE 802.3at draft, PoE switches can support greater port power and gain greater application prospects. Fengrunda launched two different standards of PoE switches for users to choose.