On Sat, 25 Feb 2017 21:17:16 -0500, wrote:

Aren't crossover cables "yellow"? Why use one unless required?

There are plenty of straight through yellow cables. I screen them with
my tester.

I have a bag of crossover cables.
They're any color they want to be.

I used to use them for.... I forget.
I think I used to use them either for computer to computer file transfer
before USB existed, or, maybe when I was connecting a WiFi transceiver to
my laptop RJ45 port.

I don't actually remember why we used these cables long ago.
Do you?