For the CATx cable, I got a 175' shielded, CAT6a cable from L-Com with 23AWG wiring. AV Access' 196ft spec did not specify how good the cable needed to be to make a 196' run successful, so I went with a 25' shorter, but high quality, cable. I got the CAT6a to future-proof, in case I wanted to go with a USB 3.0 extender down the road.

This cable was not successful in enabling my laptop to see all USB components on the other end of the extender (astrophotography gear), and I grabbed about 100' of scrap CAT5 that I found in my garage and it worked.

I have yet to have the CAT6a cable tested formally, though I can attest the wiring is all intact with all circuits. I consider L-Com to be upper echelon when it comes to cable, and they test their stuff before shipping.

It was suggested to me that the power supply the AV Access product came with was insufficient at 1A, but I found that the 100' cheap CAT5 cable passed all data even without the power plugged in to the RX box.

Once working, the AV Access system works beautifully. Best advice I can give:
Just get the product first, test with a short CATx cable for good measure, and set yourself up to be able to return a longer CATx cable if it doesn't work for whatever reason.

USB Extender 60m/196ft , 4x USB2.0 Port, Plug & Play, Supports All Operating Systems

We bought USB extender, HDMI over IP extender, 1080P HDMI KVM extender and 4K extenders. We are looking and testing right now. Seem like very useful products!
I will get back when we needing more.

What a device! Honestly, I have networking through out my entire house and should have bought one of these a while ago. Some of my non NAS drives, are unable to connect to some of the installed PC desktops as they are usually stored else where. Just with simple patchwork from my network bay im able to run this with great transfer rates, even faster than NAS as it doesn't have to go through the network traffic. Highly recommend. I have included the transfer rates i was getting. The first transfer rate was running through the mainline connections i have plummed into my house. The second was with a direct connection, with Cat 7 30M and held up absolutely fine. You only have to connect the power of this item on the receiver end so not to worry!