Testing my "new" network using netcat (nc)

Last week, I connected my 8-wired "phone cable" of unknown quality to two CAT6 Ethernet wall plugs. The OS then claimed I now have Gigabit Ethernet.

Today I tried to verify this using netcat (see first comment). I connected my PC an Laptop to the router and started on the laptop:

nc -l -p 44444 > /dev/null

and on my PC:

yes | pv | nc serverhostname.example.com 44444

Here is the result:

In the other direction is was even a bit faster. So, yes this is roughly GbE speed and I guess my cables are at least CAT5, which I did not expect.