TP-Link TL-SG2424P TL-SG2424P V1 User Guide 1910010774 - Page 124
PoE
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Chapter 10 PoE PoE (Power over Ethernet) technology describes a system to transmit electrical power along with data to remote devices over standard twisted-pair cable in an Ethernet network. It is especially useful for supplying power to IP telephones, wireless LAN access points, cameras and so on. Composition A PoE system usually consists of PSE and PD. PSE: Power sourcing equipment (PSE) is a device such as a switch that provides power on the Ethernet cable to the linked device. PD: A powered device (PD) is a device accepting power from the PSE and thus consumes energy. PDs falls into two types, standard PDs and nonstandard PDs. Standard PDs refer to the powered devices that comply with IEEE 802.3af and IEEE 802.3at. Examples include wireless LAN access points, IP Phones, IP cameras, network hubs, embedded computers etc. Advantage Cheap cabling: The remote device such as cameras can be powered by PSE in no need of prolonging its power cord additionally and Ethernet cable is much cheaper than AC wire or power cord. Easy to connect: PoE uses only one Ethernet cable with no need of external power supply. Reliable: A powered device can be either powered by PSE using Ethernet cable or powered through the provided power adapter. It is very convenient to provide a backup power supply for the PDs. Flexibility: In compliance with IEEE 802.3af and IEEE 802.3at, global organizations can deploy PoE everywhere without concern for any local variance in AC power standards, outlets, plugs, or reliability. Wide use: It can be applied to wireless LAN access points, IP Phones, IP cameras, network hubs, embedded computers etc. TL-SG2424P 24-Port Gigabit Smart PoE Switch with 4 Combo SFP Slots is a Power Sourcing Equipment (PSE). All the Auto-Negotiation RJ45 ports on the switch support Power over Ethernet (PoE) function, which can automatically detect and supply power for those powered devices (PDs) complying with IEEE 802.3af and IEEE 802.3at. The maximum power the TP-LINK PoE switch can supply is 320W and the maximum power each PoE port can supply is 30W. PoE function can be configured in the two sections, PoE Config and PoE Time-Range. 10.1 PoE Config All the RJ45 ports on the switch can be configured to supply power for the powered devices that comply with IEEE 802.3af and IEEE 802.3at. As the power every port or the system can provide is limited, some attributes should be set to make full use of the power and guarantee the adequate power to the linked PDs. When the power exceeds the maximum power limit or the power is inadequate to power the device, the switch may disconnect the power supply to the PD linked to the port with lower priority. When detecting a PD is unplugged, the switch will stop supplying the power to the PD. PoE Config, mainly for PoE attributes configuration, is implemented on PoE Config and PoE Profile pages. 116