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The IEEE began standardization of POE in 1999. The current general standard is IEEE802.3af. POE is mainly composed of two parts: a device that provides power, known as a power supply device (PSE), and a device that accepts and uses power, called power. Equipment (PD)
2. What is POE?
POE (Power Over Ethernet) refers to some IP-based terminals (such as IP phones, wireless LAN access points, APs) without any changes to the existing Ethernet Cat.5/Cat.6 cabling infrastructure. , network cameras, portable device chargers, credit card machines, etc.) While transmitting data signals, it is also possible to provide AC and DC power supply technology for such devices.
3. What is a POE SPD?
The POE lightning protector, the full name of which can be a POE Power over Ethernet (PEE) lightning protection device, is a related accessory device and component that protects the use of POE technology. At the same time, it integrates power supply, communication, and lightning protection to protect devices such as equipment, signals, and data that have been damaged by lightning strikes.
4. What harm does lightning have to the WLAN system?
It has been more than ten years since the development of POE technology. WLAN and other systems have been widely used in the field of communications in China. The maximum reliable transmission distance is up to 100 meters. Both ends of the Ethernet connection equipment are expensive, and the pressure is high due to high integration. Extremely fragile communications equipment, especially WLAN systems that are outdoors, once subjected to lightning strikes, can result in equipment damage, signal interruptions, permanent data loss, and personal injury. Over the years, lightning protection has become a difficult point for operators to build infrastructure.
The WLAN system is mainly composed of antennas, wireless APs, switches, servers, and other devices. The hazards are mainly caused by lightning strikes and lightning electromagnetic pulses. Direct lightning strikes are mainly caused by direct damage to the WLAN system equipment. Lightning electromagnetic pulses are mainly passed through. Lines such as feeders, network cables, and power supplies cause damage to the equipment.
5. What are the difficulties with POE lightning protection?
In a WLAN system, outdoor wireless APs are located at the top of a building or in an iron tower. Because power and wiring are difficult to use, POE power supply is used in most cases. POE switches often have dozens of meters away from APs. In the case of a lightning strike, a lightning electromagnetic pulse is easily formed. The lightning electromagnetic pulse invades the wireless AP or POE switch along the network cable, causing damage to the device.
According to the characteristics of the POE itself, the maximum reliable transmission distance of the POE is 100 meters. When the surge protector or other equipment is installed in the middle, problems such as signal attenuation and power loss are easily caused, and the power, communication effect, and transmission distance cannot be guaranteed. The lightning protection device performance has put forward very high requirements.
Some knowledge about POE Power over Lightning Protection Technology
1. What is Power over Ethernet?