Hi Ronny,
You are right.
In this second Early Preview, we do have basic physical network elements (as you said it is a network inventory) for Coax and Copper networks such as fiber-to-coax/copper converter ports; coax/copper cables, etc. Speaking of the power and signal calculation during the design and planning phase would be what we categorize as the Logical Network Elements.
We are developing this data model to serve as a framework for our users and partners, who will take this foundation and customize it with additional logical components. For right now, we don't have a near plan to add those components yet, but we will keep our user community updated.
Thanks a lot! And let us know if there were any other questions.