How does the F16 get it's "signal" from the Pi?
Chris - first I want to make clear that there are several F16 boards.
The F16v1 is a Pixelnet based board. Can handle two full Pixelnet universes.
The F16v2 (Blue board) is first generation F16v2. It is E1.31 input to an Ethernet jack. It can be expanded from 16 outputs to 32 outputs with an inexpensive daughter board via a ribbon cable.
The F16v2 (Red board) is second generation. It is E1.31 input to an Ethernet jack but also has an SD card slot that can be used to store FSEQ (xlights output files). It can also be expanded from 16 to 32 outputs.
The F16v3 board (unknown color) is near completion. It is E1.31 input and output (daisy chain). It is stronger, faster, but not more expensive. It will support two expansion boards, so up to 48 outputs. Various other enhancements, too.
So, which one(s), specifically, are you asking about? I know you from DLA so Pixelnet is not a stranger to you.