PBX indicating calls of given type - uses logic circuit having inputs connected to outputs of identifier describing terminal concerned

摘要

The PBX has the switch-on circuit for the terminal associated with the enquiry station passing via a logic circuit associated with this terminal. The logic circuit's inputs are connected to the outputs of the identifier describing the terminal concerned. A line that indicates the presence of a special call is connected to the logic circuit. The advantage lies in being able to display and interrogate individual calls of a given type without needing an additional network.