POE power supply (Power Over Ethernet) is a technology that provides power supply to terminal devices while transmitting data through the existing Ethernet wiring infrastructure.The main components of POE power supply include power supply equipment (PSE) and terminal equipment (PD). PSE is usually a switch or injector, while PD can be IP camera, wireless access point (AP), IP phone and other устройства .
Принцип на работа
POE technology transmits data and power simultaneously through Ethernet cable. The standard Category 5 network cable has four pairs of twisted pairs, but only two pairs are used in 10M BASE-T and 100M BASE-T. The voltage of the POE power supply system is between 44 and 57V, the typical value is 48V, the maximum current is 550mA, the power supply power is between 3 . 84 и 12.95W, а максималният не надвишава 13W.
Сценарий на кандидатстване
POE power supply is widely used in various devices that need to be powered and networked at the same time, such as IP phones, video surveillance, wireless access points, etc. Its advantage is that it simplifies the equipment installation and wiring process, does not require additional power sockets and cables, improves the deployment flexibility and system reliability of the equipment, and reduces the installation and maintenance Разходи .
Исторически произход
Стандартите за POE технологията се определят от IEEE 802 . 3AF и IEEE 802 . 3AT . стандартът IEEE 802.3AF беше одобрен през 2003 г. и посочва начина на захранване на устройства като IP фазони, системи за сигурност и безжични точки за достъп до LAN чрез захранващи кабели като IP фазони, системи за сигурност и безжични точки за достъп до LAN чрез захранващи кабели като IP фазони, системи за сигурност и безжични точки за достъп до Ethernet. IEEE 802.3AT (POE+) осигурява по -голяма мощност, като същевременно е съвместим с 802.3f.
