So, just putting this here in case anyone needs something similar down the road.
When I finished my basement, I put in grid ceiling to with a thought to VR, among other things. I got my Index a few weeks back and I have an open space I want to be able to use, so I started looking into options at extending the cable length. The idea is to run the USB/DisplayPort cables up through a conduit into the ceiling, then run the cable across so it drops down in the middle of the room. No more cable dragging along the ground for me to get tangled up in or my dog to step on.
Problem is, that meant I was looking at a 13-15 foot cable extension minimum, as most of that length is taken up from running up the wall and back across the ceiling into the room. What I discovered during this little project is that the Index pushes to the DisplayPort 1.2 standard to the limits, which means adding length to cable can get really tricky.
I tried a 15’ cable and that resulted in no signal whatsoever. I next tried a 10’ cable and while I got signal, I was getting “sparks” and other visual artifacts, as well as the display cutting out periodically. 10’ also wasn’t long enough to give me any extra room, so I had to try other options.
My first attempt was successful, but not ideal. What I went with was a 13’ DisplayPort 1.4 cable as well as an active signal booster instead of a passive DisplayPort coupler. I went with a DisplayPort 1.4 cable because it’s significantly higher rated in terms of resolution/refresh/distance and is fully backwards compatible with 1.2. I thought it was worth a shot at least. Here were the specific items I went with:
Booster:
Cable:
They also had a 16’ cable so I was going to try that, but another idea struck me: what about a fiber optic cable instead of using a signal booster? The rated ranges on the fiber optic DisplayPort cable were better at distance than the standard 1.4 cables. Maybe that would work better? So I ended up going with this:
It offers 8K/60hz or 4K/144hz at 30 feet, which sounded exactly like what I needed. More length than I needed (20 would likely be ideal), but I wasn’t able to find much shorter than that. The total cost of this solution was a little less than the booster + cable, I get twice the length, and it’s been working flawlessly.
So, yeah, in case anyone gets it in their head to do something like this, my experiences say go with the fiber cable + a regular $5 coupler and enjoy.