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It's a 5 meter long optical fibre USB cable. Here's a 10M Thunderbolt version to compare
3 meter cables don't need to be optical.
Well, the Shield does support 4k, which the Steam Link does not. I haven't used one myself, so I can't really speak to if it would work for everything you need it to, but I've heard it's overall a bit more versatile than the Steam Link since it's basically a small computer that can play some games natively on it. I'd suggest doing a bit more research on that.
The other option, which is expensive but would give you the very best experience possible, is a Thunderbolt cable like this. It does require some additional hardware, since you need a thunderbolt dock and a thunderbolt port on your desktop, but it would transmit both video/audio and data (USB) signals over that long distance without any chance of signal degradation. It's unfortunately also expensive.
Hopefully I can shed some light on this. In the video Linus mentions he bought the ASUS thunderbolt expansion cards. These cards have a DP in and a Thunderbolt out. His GPU is plugged into this card with a short DP cable and the optical thunderbolt carries the video signal to the hub. On the hub he has a miniDP to DP cable going into the monitor and plugs his mouse/keyboard/etc. into the hub.
Basically he has an expansion card that his GPU plugs into to convert all the signals the computer could want to use into thunderbolt.
This one's only 10m and $300. I believe you need a thunderbolt capable motherboard and thunderbolt adapter for your graphics card and then you would need a thunderbolt hub on the other end.
All explained here
Sorry, can't clip to where it's at cuz about to get off work.
I was totally enthralled by that Thunderbolt IO setup until I saw the price of those cables. Still... if we're dreaming.
Yes, running it over optical is a solution but it's too expensive. The 10m one is $275. I'd need a 20 meter one. [link]