Appendix (B): Power Over Ethernet; Power Consumption - 3xLogic VX-VTOF-01 User Manual

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Appendix (B): Power over Ethernet

The Power over Ethernet (PoE) is designed to extract power from a conventional twisted pair Category 5
Ethernet cable, conforming to the IEEE 802.3af Power-over-Ethernet (PoE) standard.
IEEE 802.3af allows for two power options for Category 5 cables. The IEEE 802.3af-2003 standard allows
up to 15.4 W to a device. However, 12.95W is the maximum available power as some of the power gets
lost in the cable.
PoE has advantages over conventional power in such places where AC powers cannot be reached or is
expensive to wire.

8.1 Power Consumption

Property
Available Power
Max. Power by PSE
Max. Current
Supported Cable
NOTE: For proper activation of PoE, the Category 5 cable must be shorter than 100m and conform the
PoE standard.
NOTE: With non-Power Sourcing Equipment (non-PSE): When it is connected with non PSE, the power
adaptor should be connected.
NOTE: With power adaptor: Connecting both PSE and power adaptor does not do any harm to the
product. Disconnecting PSE or power adaptor from device does not reboot the device as long as either
one is connected to the device.
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802.3af
12.95 W
15.40 W
350 mA
Category 3 or higher
802.3at
25.50 W
34.20 W
600 mA
Category 5 or higher
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