On Sun, 26 Feb 2017 03:43:24 +0000 (UTC), Jonas Schneider
wrote:

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?
I believe it was used to connect any 2 "active devices" or any two
"passive devices" before autonegotiating (Auto MDI-X) switches became
common.
So, computer to modem was a crossed cable. Computer to computer was a
crossed cable, and switch to switch was a crossed cable. Only used
straight through fom computer to switch or switch to router or router
to computer With an Auto MDI-X switch it doesn't really care if you
use a straight or crossed cable between the PC and the switcg, or
modem and PC.