With the trend of industry 4.0, "smart factories" are created and robotic devices are used to complete manufacturing tasks, so that ease of operation is increased and total cost is reduced. MLiS provides wired and wireless solutions in industrial automation as the picture shows below. To ensure network stability, MLiS industrial Ethernet switches support flash ring to construct backbone network for redundancy. In addition, other industrial devices are connected by unmanaged switches and link backbone ring. Usually rack mount switches are installed in a monitor room and connect with the ring network via fiber. Moreover, MLiS products are capable of operating in harsh environments under wire temperature range from -40°C to 75°C. As for topology, the function is to control industrial devices and bring data back to central side to monitor.