I realize this is an old thread. I'm trying to figure out if the AUP8X25S3NVDK or A2U8X25S3PHS (same board just different cages) are "standard" Oculink pinouts? As in, if I connect them to say a bifurcation breakout card or M.2 adaptor with a straight through Oculink to Oculink is the pinout correct? It sounds like they work with straight cables with the mentioned supermicro adaptor but I can't verify the pinout of that so far either.
Hey, this is a late reply, but if you are still interested, I can share my experience. It appears to be working fine with straight cables.
Not sure what you mean by bifurcation breakout card though. I've tried mine with two different setups:
1) 2x Ceacent CNS42PE16 redriver cards. That is each card plugs into an x16 PCIe slot and outputs 2x 8i SlimSAS connectors, with no PCIe switches anywhere. The overall setup is 2x [x16 slot -> ceacent CNS42PE16 redriver -> 2x 8i SlimSAS -> 2x [ceacent 8i SlimSAS -> 2x OcuLink cable]] -> A2U8X25S3PHS.
This obviously requires enabling x4x4x4x4 bifurcation in BIOS for x16 slots.
This setup recognizes all 8 hard drives and works perfectly fine with PCIe Gen3 SSDs.
2) 1x Ceacent CNS4
4PE16 card. This card is based on PEX8748 PCIe switch, uses single x16 slot, outputs 4x 8i SlimSAS connectors and requires no bifurcation in BIOS.
In this case the setup is x16 slot -> ceacent CNS44PE16 switching card -> 4x 8i SlimSAS -> 4x [ceacent 8i SlimSAS -> 2x OcuLink cable]] -> A2U8X25S3PHS.
In this case OS sees the switching card and reports 8 PCIe output ports, but does not see SSDs connected to it.
I didn't have time to troubleshoot and just turned back to redriver cards.
I'm not aware of the my cables being crossovers, neither they were advertised as ones, so I'd say straight cables should be fine.