AV200 is the slowest standard that is still interoperable with the current ones - so yes, it will work. Powerline being a shared media network, only one agent can talk at any given time. So as long as the AV200 devices run their slow transmissions, nobody else can transmit. Think timeslices: When the AV200 device has 100% load, then the others get absolutely nothing done. AV200 at 50% load leaves 50% of the time for AV1200, for a theoretical (!) maximum of 600 Mbit/s.

Thanks
Clear for me