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Power over Ethernet (802.3af) or PoE technology describes a system to transmit electrical power, along with data, to remote devices over standard twisted-pair cable in an Ethernet network. PoE can be either built into custom boards, or ADS can provide adaptors for any of our standard boards.  The Applied Data adaptors for PoE expects power to be received, via the Ethernet cable and RJ45 connector, via SPARE lines (vs. Data).

Because Applied Data products run at such low power, they are readily configurable for a PoE implementation, typically only limited by the power consumption of the LCD’s backlight inverters. The technology leverages ADS’ embedded computers to be powered remotely via Ethernet cable alone (such as with digital signage, webcams, embedded computers, controllers) where it would be inconvenient or infeasible to supply power separately.

Clause 33 of IEEE 802.3-2005 (commonly referred to as IEEE 802.3af) presently provides 48 volts DC over two out of four available pairs on a Cat. 3/Cat. 5 cable with a maximum current of 400 milliamps for a maximum load power of 15.4 watts. Only about 12.95 watts are available after counting losses, and most switched power supplies will lose another 10-20% of the available energy.

Additional information on the IEEE (802.3 af) standard may be found at: http://www.ieee802.org/

To get more information on PoE: contact us.