How Does PoE Output Work on Devices with Dual-Power Input?



Devices such as the MAX HD4, and the MAX HD2/4 with MediaFast accept dual DC input and support up to 8x 802.3at PoE ports. Here’s how it works:

If you plug in the first DC input, LAN ports 1-4 will offer PoE output. If you plug in both DC inputs all LAN ports (1-8) will offer PoE output.


An additional note here is that you need to use 48VDC power supplies in order to get these PoE ports activated.


Peplink’s partnumber for this 48V DC power supply is ACW-609. :smiley:


Hello @Alan, @Tim_S & @Joey_van_der_Gaag,
Did you know you can also power these and deliver the required voltages to operate the PoE Function from a 12VDC or 24VDC Source? We have successfully used a high quality DC-DC converter to achieve this with Solar powered installations, though it would work just as well with mobile locations such motor vehicles and water based vessels.

We have been sourcing DC-DC converters from Powerbox Australia, you can see some of the selection at, they ship internationally, and although the units are on the high side (in $) they have been designed for performance.

Happy to Help,
Marcus :slight_smile: