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What's the Difference Between Passive PoE and Active PoE?

What's the Difference Between Passive PoE and Active PoE?

Passive PoE: also known as "always on”. Power is delivered immediately without negotiation.
Active PoE: IEEE 802.3 af / at (active PoE) , standardized solution to provide power from a power supply device after negotiation with the receiving device.


PoE 802.3af/at

Passive PoE

Related cost*

Medium

Low cost*

Max.cable distance

100m

100m

Power Injection

After Negotiation

Immediately

Ethernet Support

10/100/1000 Mbit/s

10/100 Mbit/s(injected pairs +4,5 and -7,8)

Standard

802.3af/at

N/A, use by some vendors such as Mikro Tik or Ubiquity

Robust Against Wrong Cabling

Yes

No. Only anchor device can be connected into PoE socket!

Never connect to PC or another network device.

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