Due to the many good reviews I bought this device. I was looking for a robust device with high reliability for the communication of my 2 PV inverters. Unfortunately, this device was a pure disappointment. In all 5 ports, the connected RJ45 connector wiggle so strong that communication is constantly interrupted. The replacement of the LAN cable to high-quality patch cables brought no success. Only with the aid of a toothpick -eingeklemmt between Port socket and RJ45 connector can be positioned on the contacts of Stcker that a communication can be established. But that's not the purpose. Apparently, the manufacturing tolerances of the port sockets are too high, otherwise so should not be extradited a device. I'll return these scrap and looking me an alternative.