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PoE

Power over Ethernet (PoE) is a standard for providing DC electrical power along with data over twisted pair ethernet cabling. There are two modes.

Mode A also known as endspan, transmits both data and power on the orange and green pairs. This method is best when both power and data originate from the same power sourcing equipment.

PoE Mode A

Mode B also known as midspan, transmits power over the blue and brown pairs and data on the orange and green pairs. PoE injectors that inject power into a standard Ethernet ports often use Mode B to power devices.

PoE Pinout

The power supply is usually between 44 – 57v, although 48v is used for most devices. PoE can be used to power wireless access points, VoIP phones, and IP cameras.

  • PoE (802.3af) is the original PoE standard and provides 15.4W of power the device at 100m distance from the switch.
  • PoE+(802.3at) provides 30W of power to the device at 100m distance from the switch.
  • PoE++(802.3bt) doubles the PoE+ power to the device by providing 60W or 90W of power at 100m distance from the switch.
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