A:AnswerIt works with either. We do not have a cable hooked up to it and have only used it for streaming (Netflix), aux input from a laptop, and broadcast TV.
A:AnswerTo link an Echo device: Open the Alexa Smartphone app, go Home > Menu > Settings > Video and TV > Fire TV and follow the on-screen instructions.
A:AnswerNot sure what are you asking.
The tv as built-in fire tv and the tv remote controls the tv and the fire tv built in it.
If you use an external firebox than use the remote for the fire box.