This spring, Insteon’s market-leading home automation systems will be adding support for Apple Watch users. Insteon uses both power lines and radiofrequency communication capabilities inside the home to allow homeowners to automate many common household systems.
Insteon tries to combine the best of both worlds which means it supports powerline communication as well as radio frequency communication. Considering it only as a protocol would be an understatement. It is rather a complete technology stack which also consists of separate protocols for the two different types of communication.