Ubiquiti PowerBeam M PBE-M2-400 Quick Start Manual page 10

9. Connect the other end of the Ethernet cable from the
PowerBeam to the Ethernet port labeled POE on the
PoE Adapter.
10. Connect an Ethernet cable from your LAN or computer to
the Ethernet port labeled LAN on the PoE Adapter.
11. Connect the Power Cord to the power port on the PoE
Adapter. Connect the other end of the Power Cord to a
power outlet.