A communication stack (e.g. HTTP over TCP over Ethernet) is an interesting application for Realized Physical Ports. However, since it seems to me that the port realization has to connect different levels (SA, LA, PA), I think that such modeling would not be practical and be a bit artificial. But I’m also not sure if I understood the above correctly.
Anyway, a layered communication model was also discussed here: Modeling of a layered communication architecture - #3 by andreas_n