PoE

Standardised PoE

PoE standards
- POE
  - IEEE 802.3af-2003
  - 15.4 W of DC power (12.95 W assumed available at powered device)
  - powered devices are called "type 1" devices
  - autosensing so it will only turn the power on if it detects a PoE device connecting to it.
- POE+
  - IEEE 802.3at-2009
  - 25.5 W of DC power (??? W assumed available at powered device)
  - powered devices are called "type 2" devices
  - autosensing so it will only turn the power on if it detects a PoE device connecting to it.
- POE++ or 4PPoE
  - IEEE 802.3bt-2018
  - 60W (51W delivered) (type 3) or 90W (71.3W delivered) (type 4)
  - powered devices are called "type 3" and "type 4" devices
  - autosensing so it will only turn the power on if it detects a PoE device connecting to it.

Non-standard PoE

Unifi

Unifi has a thing on older/cheaper devices it calls PoE but it's not standard

24 VDC and
either on or off - no autosensing on ports.

Some Unifi AP-Lites use only 24V so you need a device to step down from 48V e.g. this Unifi adapter

Cisco UPoE

Cisco has it's own thing called UPoE which provides up to 60W