Power supply/Isolation board for powerline Ethernet module

Used with common powerline ethernet modules and an external switchmode power supply on a 48VDC bus. Most brands of powerline modules can operate at 48VDC. The input capacitors in switchmode power supplies clamp the high frequency powerline signal, greatly reducing range - this board provides isolation of the signal via two inductors. There is also a bridge rectifier to make the unit polarity insensitive, a switch to select between 48VDC / 0 / 18VDC (the SMPS output) and two indicator LEDs to show which output is selected.