A ball valve sealing ring is provided for sealing between a ball valve member a valve body. The system and method include the transmission of a selective interlock signal from a downstream circuit breaker to an upstream circuit breaker in the event a first or second fault condition is detected. Each of the master IC and slave IC has an input terminal for receiving the display control signal from the master IC through an external wiring. The configuration messages consume valuable air interface resources. Instead, this information is sent to the middlebox control node, as part of signalling messages, from middlebox-identity-providing nodes.