I have a NAS kind of box, which I got it from my old office when they were moving out, at first I thought this was a simple Ethernet cable, but it is not. Any idea what this connection is?

[![enter image description here](https://i.stack.imgur.com/rY3Og.jpg)](https://i.stack.imgur.com/rY3Og.jpg)
Another one:
[![enter image description here](https://i.stack.imgur.com/aqQLN.jpg)](https://i.stack.imgur.com/aqQLN.jpg)