Non-standard POE is relative to standard POE.

Standard POE conforms to IEEE802.3af or IEEE802.3at(at compatible af) standard, and has a handshake protocol (2-10V detection voltage), and the step-up power supply will be carried out only after the hand is grasped (the terminal equipment supports POE);

Non-standard POE does not have handshake protocol, and 48V power supply is mandatory, regardless of whether the terminal equipment supports POE or not, 48V output power supply is mandatory!

Standard POE:

IEEE802.3af standard, PSE end 15.4W, PD end 12.95W；;

IEEE802.3at standard, 30-36W at PSE end and 25.5W at PD end.

Standard POE is intelligently controlled by PSE chip and has detection function.

Working process of standard POE power supply (802.3af):

When the PSE power supply terminal equipment is arranged in a network, the working process of POE Ethernet power supply is as follows.

Step 1 detect

At first, the PSE device outputs a small voltage at the port until it detects that the cable terminal is connected to a power receiving device supporting the IEEE 802.3af standard.

2. PD terminal equipment classification

When PD is detected, PSE equipment may classify PD equipment and evaluate the power consumption required by this PD equipment.

3. Start power supply

During the start-up period of a configurable time (generally less than 15μs), PSE equipment began to supply power to PD equipment from low voltage until it provided 48V DC power.

4. Power supply

Provide stable and reliable direct current of 48V for PD equipment, and meet the power consumption of PD equipment without exceeding 15.4W.

Step 5 cut off power

If the PD device is disconnected from the network, PSE will quickly stop supplying power to the PD device (generally within 300 ~ 400 ms) and repeat the detection process to detect whether the terminal of the cable is connected to the PD device.

Non-standard POE has no PSE chip, and directly supplies 48V power to PD terminal.

It can be seen that non-standard POE generally does not do 1,2, 3,6 power supply modes, which is too dangerous.

If you distinguish between standard and non-standard POE?

Measure the power supply pins (1,2, 3,6 or 4,5, 7,8) with an electric meter.

If there is a non-standard 48V stable output (no detection, 48V direct power supply);

If the voltage cannot be measured (2-10V jump, the PD terminal is detected), it is standard POE (the meter is not a legal PD, so it will not supply power without voltage).