Krone LSA-Plus is basically a way to connect wires together in things like telephones and computer networks.
Imagine you have a bunch of different colored Lego blocks that you want to connect together. In order to do this, you need some kind of connector that can connect all the different colors together in the right way.
That's kind of what Krone LSA-Plus does. It has little metal connectors that can hold different wires in place so that they make the right connections.
It's called "LSA-Plus" because it stands for "Lötfreie Schneid-Klemm-Anschluss Plus" which is German for "solder-free cutting-clamping connection plus". Basically, it means you don't need to use solder to connect the wires - you just cut them to the right length and clamp them in the connector.
So Krone LSA-Plus connectors are used to make sure all the wires are connected properly in things like telephone systems and computer networks. It's like a grown-up version of connecting Lego blocks, but with wires instead!