Power over Ethernet (PoE)
Power over Ethernet, also known as PoE, is a technology for carrying power along with data on standard CAT5 network cables, allowing devices to be powered
via their network ports. It is supported by some devices directly (e.g. 802.3af compliant switches, CP4002 IP cameras) while other devices require PoE accessories, such as midspan hubs (for switches) and active splitters (for edge devices), in order to make use of the technology. The device providing power, whether it is a network switch or midspan hub, is referred to as the Power Sourcing Equipment (PSE), while the device receiving power is known as the Powered Device (PD). Power over Ethernet (PoE) integrates data and power over standard LAN infrastructures. Since PoE devices do not require wall-mounted power supplies, overall system costs are lower. For IP telephony, uninterruptible power supplies (UPS) guarantee higher reliability and less susceptibility to power surges, theft, interruption, or disconnection. Worldwide usage of the RJ-45 power connector ensures global compatibility of PoE devices. For wireless access-point applications, these systems do not require AC power sources, power lines, or outlets. PoE-enabled devices offer superior management flexibility with remote power up/down capability. Power over Ethernet is a revolutionary technology and will improve the power supply system of Network Equipment. PoE enables network administrators to deploy new range of applications by full use of the existing network facilities.