The communications system architecture is based on the fundamental property of ethernet networks that allow different sessions on the same interface and with different protocols. That's the biggest revolution that provides IT (Information Technology) to networks of computers within an electricity substation, which was unthinkable until very recently.

In this post you can download a diagram of the architecture levels for communications purposes.

The attached diagram can see the different sessions that will withstand the IEDs that belong to the network and operating protocols in each. This is an example of what can be done, but a real example, taken from a strictly implemented and operating experience.(unfortunately the system does not allow us to show images in post)