US Patent 9118503 Communication system, relay device and wiring harness

GateWay (GW) having a shape of a substantially-flat rectangular parallelepiped and including terminals on one wide surface or both wide surfaces, GWs are stacked on each other so as to connect first corresponding terminals while connecting second corresponding terminals. The corresponding terminals are connected inside each GW, and are connected with each other via a component for transmitting a communication signal through a communication line and via a relay processing section for executing a relaying process for the communication signal. By stacking GWs on each other, the function of a multi-bus GW can be realized.