Abstract: A data bus is a common interconnection which serves as a two-way data link between inputs and outputs of several logic blocks in a time shared manner. A data bus arrangement is disclosed which can be utilized to interconnect a plurality of ports with each other and which utilize Josephson junction devices. Each of a plurality of ports represents the output from a computer or other logic circuit and these outputs represent inputs on control lines associated with each Josephson device which switch it. Each Josephson device is separately energized from its own current source and, upon switching, diverts current down a transmission line which has an impedance, Z.sub.o. In a single wire-over ground plane embodiment, all of the transmission lines are connected to a single node in a star arrangement. A terminating resistor which terminates each of the lines in a value of resistance equal to Z.sub.