Chapter 9 Communications Circuits 9.4.2 Multipoint Circuits A circuit that connects more than two points is called a multipoint circuit or multi-drop circuit. 9.4.3 Tw0-wire and Four-wire Circuits Four-wire circuits are preferable to two wire circuit for data transmission because they can carry communications in both directions simultaneously without employing any special multiplexing techniques www.gxmu.edu.cn9.4.2 Multipoint Circuits A circuit that connects more than two points is called a multipoint circuit or multi-drop circuit. 9.4.3 Two-wire and Four-wire Circuits Four-wire circuits are preferable to two wire circuit for data transmission because they can carry communications in both directions simultaneously without employing any special multiplexing techniques. www.gxmu.edu.cn Chapter 9 Communications Circuits