I have 3 Netvanta 1638p switches which I'm configuring into a Active Chassis stack. None have been configured with Activechassis mode enabled yet. I have purchased the Activechassis modules and cables and ready to start the configuration.
In the ActivChassis In AOS configuration guide the topology refers to 4 switches.
My question is how to connect the cables with 3 switches? I created the following diagram of how I am thinking the cables should go.
I've set up ActiveChassis the same way for multiple customers running a switch stack of 3 and haven't run into any issues; you should be fine.